Developer Tools, In Your Browser

Format, validate, and beautify JSON with syntax highlighting and tree view.

Encode and decode Base64 strings and files with drag-and-drop support.

Decode JSON Web Tokens to inspect header, payload, and verify signatures.

Build and validate cron expressions with a visual editor and next run times.

Test regular expressions with real-time match highlighting and capture groups.

Generate, validate, and inspect UUIDs in v4 and v7 formats.

Convert between Unix timestamps and human-readable dates with timezone support.

Encode and decode URLs, parse query parameters, and build query strings.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text and files.

Convert colors between HEX, RGB, HSL formats with contrast checker and palette generator.

Compare two texts side by side with line-by-line and character-level diff highlighting.

Convert between symbolic (rwx) and numeric (octal) Unix file permissions interactively.

Encode and decode HTML entities, named characters, and Unicode escape sequences.

Convert between JSON and YAML formats instantly with syntax validation.

Browse, search, and learn about all HTTP status codes with detailed explanations.

Write and preview Markdown in real time with GFM support, tables, task lists, and HTML export.

Convert text between camelCase, PascalCase, snake_case, kebab-case, and other naming conventions.

Format, beautify, and minify SQL queries with dialect support for MySQL, PostgreSQL, and SQLite.

Generate placeholder text in paragraphs, sentences, or words with HTML wrap options.

Generate secure passwords and passphrases with entropy-based strength analysis.

Convert between CSV and JSON formats with delimiter selection, header toggle, and file drag-and-drop.

Generate TypeScript interfaces or type aliases from JSON with nested type inference.

Convert numbers between binary, octal, decimal, hexadecimal, and custom bases with bit visualization.

Calculate IPv4 subnet details including network address, broadcast, host range, and CIDR notation.

Visually build Flexbox and CSS Grid layouts with live preview and generated CSS code.

Generate HTML meta tags, Open Graph, and Twitter Card tags with live SNS preview.

Minify and beautify JavaScript, CSS, and HTML code with size comparison stats.

Generate QR codes from text, URLs, or WiFi credentials with customizable size, colors, and error correction.

Generate JSON Schema from sample JSON data with type inference, required fields, and nested object support.

Design CSS box shadows visually with sliders for offset, blur, spread, and color. Multi-layer support.

Count words, characters, sentences, paragraphs, and estimate reading time with keyword frequency analysis.

Create linear, radial, and conic CSS gradients visually with color stops, angle control, and live preview.

Build Markdown tables visually with an interactive editor. Add rows, columns, set alignment, and copy the output.

Design CSS border-radius values visually with per-corner control, live preview, and generated CSS code.

Convert between px, rem, and em CSS units with a configurable base font size and quick-reference table.

Escape and unescape strings for JSON, JavaScript, HTML, URL, SQL, and CSV formats.

Compress images in your browser with quality and resize controls. Compare file sizes before and after.

Format, validate, and minify XML with customizable indentation and syntax error highlighting.

Convert curl commands to Python, JavaScript fetch, PHP, Go, and more programming languages.

Sort lines alphabetically, remove duplicates, trim whitespace, and filter empty lines instantly.

Generate favicons from text or emoji with custom background colors. Export multiple sizes for web use.

Compare two JSON objects structurally. Detect added, removed, and changed values with key-order-independent diff.

Convert HTML to clean Markdown with support for headings, links, images, lists, tables, and code blocks.

Format, validate, and minify YAML with customizable indentation and syntax error display.

Evaluate JSONPath expressions against JSON data with real-time results and match highlighting.

Design CSS text-shadow effects visually with sliders for offset, blur, and color. Multi-layer support.

Convert Markdown to clean HTML with GFM support, syntax highlighting preview, and one-click copy.

Browse, search, and filter ASCII and Unicode characters with decimal, hex, octal, and binary values.

Build CSS keyframe animations visually with timeline editor, easing curves, and live preview.

Generate robots.txt files with a visual editor for user-agents, allow/disallow rules, and sitemap entries.

Write HTML, CSS, and JavaScript with instant live preview in a sandboxed iframe. No setup required.

Optimize and minify SVG files by removing metadata, comments, and unnecessary attributes. Compare file sizes.

Design CSS filter effects visually with sliders for blur, brightness, contrast, grayscale, and more. Live preview and generated code.

Press any key to see its event.key, keyCode, code, and which values. Searchable reference table for all keyboard events.

Convert between JSON and XML formats instantly with customizable root element and attribute handling.

Calculate and convert aspect ratios for responsive design, video, and images. Supports common presets and custom ratios.

Extract colors from any image with a visual eyedropper. Get HEX, RGB, and HSL values with one click.

Validate JSON data against a JSON Schema with detailed error messages and path highlighting.

Detect text and file character encoding (UTF-8, ASCII, ISO-8859-1, Shift_JIS, and more) with confidence scores.

Convert plain CSS to Tailwind CSS utility classes. Paste CSS rules and get equivalent Tailwind classes instantly.

Preview how your URL appears on social media. Fetch and display Open Graph and Twitter Card meta tags.

Convert between TOML and JSON formats instantly. Perfect for Cargo.toml, pyproject.toml, and config files.

Convert between Terraform HCL and JSON formats with syntax highlighting and tree view.

Convert JSON to Go struct definitions instantly. Generates idiomatic Go types with json tags and proper naming.

View and edit files or text as hexadecimal. Hex dump with offset, hex, and ASCII columns.

Lint and validate Dockerfiles against best practices. Catch common issues before building images.

Validate full crontab files with multiple entries, comments, and environment variables. Shows next run times.

Encode and decode Base32 strings. Commonly used for TOTP secrets, OTP keys, and binary-to-text encoding.

Generate JSON Web Tokens with custom payloads and HMAC signing. Set claims, expiration, and copy the signed JWT.

Three-way merge tool. Resolve conflicts between Base, Mine, and Theirs versions of text.

Press any key to see its event.key, event.code, keyCode, and which values in real time. Essential for keyboard event handling.

Step through regex matching visually. See how the engine processes your pattern character by character.

Convert multiple timestamps at once. Paste a list of Unix timestamps or dates and convert them all in bulk.

Apply CSS gradients to text with live preview. Generate background-clip text gradient effects instantly.

Convert text to URL-friendly slugs. Supports multiple languages, custom separators, and bulk conversion.

Generate YAML Schema from JSON data automatically. Validate CI/CD configs, Kubernetes manifests, and more.

Search, browse, and copy emojis by name or category. View Unicode codepoints, shortcodes, and skin tone variants.

Calculate and compare CSS selector specificity scores. Visualize which selector wins in a cascade.

Extract and validate all links in Markdown text. Check for broken URLs, missing anchors, and redirects.

Generate chmod and chown commands visually. Select permissions with a GUI and get the full shell command.

Convert between YAML and .env file formats. Flatten nested YAML keys into environment variable names.

Format, minify, and validate GraphQL queries and schemas. Syntax highlighting with proper indentation.

Convert SQL CREATE TABLE statements to Prisma schema models. Supports common SQL types and relations.

Extract data from SQL CREATE TABLE and INSERT INTO statements into CSV format with customizable delimiters.

Generate .gitignore files by selecting languages, frameworks, and IDEs. Combine multiple templates instantly.

Convert JSON arrays to SQL INSERT statements. Supports bulk inserts, table name customization, and multiple SQL dialects.

Generate Nginx server blocks visually. Configure reverse proxy, SSL, static files, and redirects with a GUI.

Fetch and analyze HTTP response headers for any URL. Check security headers, caching, CORS, and more.

Convert text to binary, octal, decimal, and hex representations. Visualize individual bits with 8-bit grouping.

Resize images in the browser with custom dimensions. Maintain aspect ratio, choose output format, and batch process multiple files.

Convert SVG files to PNG or JPEG in the browser. Set custom scale, dimensions, and background color.

Convert JSON to Python dataclasses or TypedDict. Generate type-safe Python code from any JSON structure.

Generate XML sitemaps from a list of URLs. Set priority, change frequency, and last modified dates for each entry.

Generate Apache .htaccess rules for redirects, CORS, caching, gzip compression, and security headers.

Validate and lint Docker Compose YAML files. Check service definitions, networks, volumes, and common configuration errors.

Convert text to ASCII art using various font styles. Choose from multiple fonts, adjust width, and copy the result.

Convert JSON to Kotlin data classes with serialization annotations. Generate type-safe Kotlin code from any JSON structure.

Create CSS clip-path shapes visually. Edit circle, ellipse, polygon, and inset paths with a live preview and copy the CSS.

Convert JSON to CREATE TABLE statements. Generate SQL schema for MySQL, PostgreSQL, and SQLite with automatic type inference.

Convert Markdown to presentation slides. Use --- separators to create slides with live slideshow preview.

Validate .env files for syntax errors, duplicate keys, missing quotes, and compare against .env.example templates.

Preview Tailwind CSS classes in real-time. Type class names and see the styles applied instantly with responsive breakpoint testing.

Generate DNS zone records including A, AAAA, CNAME, MX, TXT, NS, and SRV records. Export as BIND zone file format.

Generate package.json files with a visual form. Set name, version, scripts, dependencies, and other fields with validation.

Build Git commands visually. Select operations, options, and flags to construct the correct git command with explanations.

Compare multiple time zones side by side, find meeting times, and track daylight saving changes.

Build docker run commands visually with ports, volumes, env vars, and generate docker-compose.yml.

Generate fake names, emails, addresses, and more. Export as JSON, CSV, SQL, or TypeScript.

Encrypt and decrypt text with AES-256-GCM using a password. All processing in your browser.

Write Mermaid diagrams with live preview. Export as SVG or PNG. Supports flowcharts, sequence, ER, and more.

Rotate images by 90°, 180°, 270° and flip horizontally or vertically. Free browser-based tool.

Crop images to custom dimensions with rectangle and circle modes. All processing in your browser.

Adjust image brightness, contrast, and saturation with real-time preview. Client-side processing.

Apply grayscale, sepia, blur, invert, and other visual effects to images in your browser.

Remove backgrounds and make colors transparent in images. Click to select color, adjust tolerance.

Generate HMAC signatures using MD5, SHA-1, SHA-256, SHA-384, and SHA-512 with hex or Base64 output.

Decode and inspect PEM/DER SSL certificates. View issuer, subject, validity, extensions, and fingerprints.

Build Content Security Policy headers visually with directive presets and real-time policy output.

Generate RSA key pairs (2048/3072/4096-bit) in PEM format using the Web Crypto API. Entirely in-browser.

Generate and verify Time-based One-Time Passwords (RFC 6238). Create secrets, QR codes, and test 2FA tokens.

Analyze password strength with entropy calculation, pattern detection, and time-to-crack estimation.

Generate bcrypt password hashes and verify passwords against existing hashes. Configurable salt rounds.

Generate Subresource Integrity hashes for scripts and stylesheets. Supports SHA-256, SHA-384, and SHA-512.

Detect and redact secrets, API keys, tokens, and credentials in text. Prevent accidental exposure in logs and docs.

Experiment with AES-GCM, AES-CBC, and RSA-OAEP encryption. Step-by-step visualization of the encryption process.

Convert SQL SELECT statements to MongoDB find() and aggregate() queries with full clause support.

Visualize SQL JOIN types with interactive Venn diagrams and live result tables.

Convert SQL CREATE TABLE statements to Sequelize model definitions with DataTypes mapping and associations.

Convert SQL CREATE TABLE statements to Drizzle ORM schema definitions with type-safe column builders.

Build database connection strings for PostgreSQL, MySQL, MongoDB, Redis, SQLite, and MSSQL.

Generate realistic seed data from SQL CREATE TABLE schemas. Export as SQL INSERT, JSON, or CSV.

Convert Prisma schema models to SQL CREATE TABLE statements. Supports PostgreSQL, MySQL, and SQLite.

Interactive SQL reference with syntax, examples, and dialect-specific variations for PostgreSQL, MySQL, and SQLite.

Design entity-relationship diagrams visually with drag-and-drop. Export as SVG, PNG, or SQL CREATE TABLE.

Convert JSON to Zod schema definitions with type inference, optional/nullable fields, and strict mode.

Validate commit messages against the Conventional Commits specification. Check type, scope, description, and body format.

Convert ticket numbers and titles into clean git branch names with configurable naming conventions.

Resolve git merge conflicts visually. Paste conflict markers, compare sides, and choose or edit the resolution.

Generate CHANGELOG.md from Conventional Commits. Group by type, add version headers, and export in Keep a Changelog format.

Build useful git aliases with a GUI. Browse popular aliases, customize commands, and export as git config.

Generate .gitattributes files for line ending normalization, binary file handling, and diff/merge settings.

Generate Conventional Commits messages with a visual form. Select type, scope, description, body, and breaking changes.

Generate ~/.ssh/config entries visually. Configure hosts, identity files, proxy jumps, and connection options.

Build Content-Type headers with the correct MIME type, charset, and boundary parameters. Copy as header or curl flag.

Interactive HTTP method reference with detailed specs for GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS, and more.

Convert between API rate limit units. Calculate requests per second, minute, hour, and day with burst capacity planning.

Build CORS headers visually. Configure allowed origins, methods, headers, and credentials with live header output.

Visualize OAuth 2.0 authorization flows with step-by-step diagrams. Covers Authorization Code, PKCE, Client Credentials, and more.

Browse and search common MIME types for web development. Covers JSON, images, video, fonts, and more.

Generate realistic mock API responses with custom schemas, pagination, and error templates for frontend testing.

Experiment with all CSS Flexbox properties visually. Configure container and item settings with live preview and generated CSS code.

Visually edit cubic-bezier() easing functions with draggable control points, animation preview, and comparison mode.

Generate CSS transition properties visually with property, duration, timing function, and delay controls. Live preview and presets.

Experiment with CSS transform functions visually. Build translate, rotate, scale, skew, and 3D transforms with live preview.

Design color theme systems with CSS custom properties. Auto-generate shade scales, semantic tokens, and dark mode variants.

Browse 60+ device viewport sizes for responsive web design. Compare iPhone, iPad, Android, laptop, desktop, and TV screen dimensions.

Design and manage CSS z-index layer hierarchies visually. Generate CSS variables, Sass maps, or JS/TS objects with conflict detection.

Build CSS font-family stacks with drag-and-drop reordering, live preview, and popular presets for system, serif, sans-serif, and monospace fonts.

Check WCAG 2.1 color contrast ratios for AA and AAA compliance. Test foreground and background color pairs with live preview.

Visually edit SVG path d attributes with draggable control points, command palette, bezier curve handles, and real-time preview.

Align text into neatly formatted columns with customizable delimiters, per-column alignment, and live preview.

Apply unified diff patches to text, reverse-apply patches, review hunks, and generate diffs between two texts.

Inspect Unicode characters with code point, UTF-8/UTF-16 encoding, character name, category, and block details.

Visualize invisible characters like spaces, tabs, newlines, zero-width spaces, and BOM. Detect line endings and clean hidden characters.

Calculate string length in characters, code points, grapheme clusters, and byte sizes for UTF-8, UTF-16, and UTF-32.

Convert between Apple Property List (plist) XML and JSON formats with type detection and tree view.

Convert between INI configuration files and JSON format with section handling, comment preservation, and type coercion.

Convert between fixed-width positional text and CSV format with column definitions, auto-detection, and presets.

Infer JSON Schema from XML sample data with automatic type detection, array inference, and attribute handling.

Parse .proto definitions and visualize messages, fields, enums, services, and RPCs. Convert to JSON Schema or TypeScript interfaces.

Convert Java .properties files to JSON and back. Supports dot-notation expansion, Unicode escapes, multi-line values, and comments.

Convert between tab-separated values and comma-separated values with proper quoting, escaping, and multiline support.

Convert JSON arrays to optimized bulk SQL INSERT statements with batch sizing, dialect support, and column mapping.

Generate Terraform variable definitions (variables.tf) and tfvars files from a visual form with type support and validation rules.

Format, validate, and beautify Terraform HCL code with auto-indent, equals alignment, attribute sorting, and syntax highlighting.

Parse AWS S3 URLs into bucket, key, region, and URL style. Build S3 URLs from components. Supports virtual-hosted, path-style, s3://, and ARN formats.

Validate Kubernetes YAML manifests for common issues — missing fields, deprecated APIs, security misconfigs, and best practice violations.

Build AWS CLI commands visually. Select service, operation, fill in parameters, and generate ready-to-use aws commands with syntax highlighting.

Generate AWS IAM policy JSON documents from a visual form. Select services, actions, resources, and conditions with common policy templates.

Compare AWS, Azure, and GCP regions side by side. Search by location, view region codes, availability zones, and latency estimates.

Validate Helm values.yaml files against common patterns and best practices. Check types, compare overrides, and view value trees.

Parse AWS ARN strings into partition, service, region, account ID, and resource components. Build ARNs from parts.

Visually build Kubernetes Pod, Deployment, StatefulSet, and DaemonSet YAML manifests with containers, probes, volumes, and tolerations.

Generate semantic-release configuration files visually. Select plugins, configure branches, set release rules, and export as JSON, YAML, or JS.

Design health check endpoint JSON responses with component checks, HTTP status mapping, and Kubernetes probe formats.

Build GitHub Actions workflow YAML files visually. Configure triggers, jobs, steps, matrix strategies, and secrets references.

Calculate SLA uptime percentages and equivalent downtime in days, hours, minutes, and seconds. Compare nines of availability with reverse downtime calculator.

Generate Makefiles visually with targets, dependencies, variables, and templates for C, Go, Node.js, Python, and Docker projects.

Build .gitlab-ci.yml pipeline configurations visually. Define stages, jobs, artifacts, caching, and rules for GitLab CI/CD.

Generate systemd service unit files visually. Configure service type, restart policy, environment variables, and download ready-to-use .service files.

Lint and check bash/shell scripts for common issues, deprecated syntax, and best practices. Catch bugs before they reach production.

Parse and color-code server logs from Apache, Nginx, JSON, syslog, Docker, and Kubernetes formats with severity filtering and statistics.

Generate feature flag configuration templates for LaunchDarkly, Unleash, JSON, and YAML with targeting rules, rollouts, and user segments.

Generate JSDoc and TSDoc comment blocks from JavaScript and TypeScript function signatures with @param, @returns, @throws, and @example tags.

Generate professional README.md files from a simple form. Choose templates, add badges, sections, and download instantly.

Generate OpenAPI 3.0 / Swagger YAML documentation visually. Build endpoints, parameters, schemas, and responses with a form.

Generate CODE_OF_CONDUCT.md files from Contributor Covenant, Citizen, Django, or custom templates with customizable sections.

Build GitHub and GitLab issue templates visually. Generate YAML issue forms or classic Markdown templates with custom sections, labels, and assignees.

Generate professional release notes from version info and change entries. Supports Keep a Changelog, GitHub Release, and Conventional Changelog formats.

Generate customizable pull request templates in Markdown for GitHub and GitLab with section toggles, checklists, and presets.

Edit and preview OpenAPI/Swagger specs in YAML or JSON with live endpoint rendering, schema viewer, and method badges.

Write PlantUML diagrams with live preview. Supports sequence, class, activity, use case, component, state, and deployment diagrams. Export as SVG or PNG.

Generate professional CONTRIBUTING.md files for open source projects with templates for contribution types, commit formats, and PR processes.

Convert start-to-end IP address ranges into minimal CIDR notation blocks. Reverse CIDR to IP range, batch mode, host count display.

Calculate CIDR ranges, detect overlaps, check containment, and merge IP blocks. Shows network, broadcast, subnet mask, and host count.

Expand and compress IPv6 addresses. Convert between full and shorthand notation with type detection and binary representation.

Calculate file transfer times based on file size and bandwidth. Compare speeds across 4G, 5G, WiFi 6, Ethernet, and USB connections.

Analyze IPv4 and IPv6 addresses to see class, type, binary representation, private/public status, and IANA reserved range information.

Browse and search 100+ well-known, registered, and dynamic TCP/UDP port numbers with service names and protocol details.

Parse URLs into components or build URLs from parts. Extract protocol, hostname, port, path, query parameters, and hash fragment.

Compare two package.json files side by side. Detect added, removed, and changed dependencies with version bump detection.

Convert between Python requirements.txt and pyproject.toml dependency formats with support for version specifiers, extras, and environment markers.

Identify open source licenses from pasted text, compare permissions and conditions, and generate license files with your details.

Check semver range matches, compare versions, calculate increments, and batch-test version lists with semantic versioning rules.

Format, validate, and clean up Go module files. Sort dependencies, align versions, detect duplicates, and inspect directives.

Visualize binary trees interactively with BST operations, traversal animations, balance checking, and AVL rotations.

Perform AND, OR, XOR, NOT, and shift operations with visual binary representation and step-by-step breakdowns.

Perform matrix addition, multiplication, transpose, determinant, inverse, row echelon form, and rank calculations with step-by-step solutions.

Visualize and interact with Stack, Queue, Linked List, Hash Table, and Heap data structures with step-by-step animations.

Inspect IEEE 754 single and double precision floating-point numbers with interactive bit visualization and comparison mode.

Visualize sorting algorithms step by step with animated bar charts. Compare Bubble Sort, Quick Sort, Merge Sort, Heap Sort, and more side by side.

Interactive Big-O complexity reference with growth charts, algorithm database, and comparison tools. Visualize O(1) to O(n!) growth curves.

Build directed and undirected graphs interactively and visualize BFS, DFS, Dijkstra, and topological sort algorithms step by step.

Calculate gzip and deflate compressed size of text, code, or files instantly. See compression ratios and visual size comparisons.

Generate HTML preload, prefetch, preconnect, and dns-prefetch link tags with best practice validation.

Build Cache-Control headers visually with toggle switches for every directive, duration presets, and server config snippets.

Calculate and visualize web performance budgets based on connection speed, target load time, and asset category allocation with presets and export options.

Interactive reference for Core Web Vitals (LCP, INP, CLS) and supplementary metrics (FCP, TTFB, TBT) with threshold checks and optimization tips.

Generate data URIs from files or text, decode existing data URIs, and get CSS/HTML/Markdown snippets instantly.

Compare two images pixel by pixel with side-by-side, overlay slider, and pixel diff modes.

Convert images between JPEG, PNG, WebP, BMP, and AVIF formats with quality control and batch processing.

Generate CSS sprite sheets from multiple images with grid layout, CSS code generation, and PNG download.

Add customizable text watermarks to images with font, color, opacity, rotation, and position controls. Supports tiling.

Combine multiple SVG files into a single sprite sheet with <symbol> elements. Preview icons, generate usage code, and download sprite.svg.

View and extract EXIF, IPTC, and XMP metadata from photos. See camera settings, GPS location, and strip metadata for privacy.

Convert images to ASCII art with customizable character sets, width control, color modes, and real-time preview.

Extract dominant color palettes from images with HEX, RGB, HSL values. Export as CSS variables, Tailwind config, JSON, or SVG.

Generate custom placeholder images with configurable size, colors, text, and format. Download as PNG, JPEG, or SVG.

Normalize Unicode text to NFC, NFD, NFKC, or NFKD forms. Compare forms side by side with character-level breakdowns.

Test and preview ICU MessageFormat patterns with live variable substitution, plural, select, number, and date formatting.

Browse all IANA timezones with live clocks, UTC offsets, DST status, and timezone comparison.

Generate structured i18n translation keys from UI text. Supports JSON, YAML, TypeScript, XLIFF, PO/Gettext output formats.

Test JavaScript Intl API formatters with any locale. Preview NumberFormat, DateTimeFormat, ListFormat, PluralRules, Collator, and DisplayNames.

Search 250+ ISO 3166-1 country codes with alpha-2, alpha-3, numeric, calling codes, TLDs, and flag emojis. Filter by region.

Interactive date format reference for JavaScript, Python, Java, PHP, Go, Ruby, and C#. Test patterns live and compare tokens across languages.

Browse and search 150+ ISO 4217 currency codes with symbols, countries, decimal places, and Intl.NumberFormat formatting previews.

Browse ISO 639 language codes, BCP 47 tags, and locale identifiers with search, filtering, and click-to-copy.

Interactive reference for all TypeScript built-in utility types with searchable examples, syntax, and playground.

Interactive crontab quick reference with searchable expressions, field breakdown, special characters, and next run times.

Searchable keyboard shortcut cheat sheet for VS Code, IntelliJ, Chrome DevTools, Terminal, macOS, Windows, Slack, and Figma with OS toggle.

Comprehensive git command reference organized by workflow. Search, reverse lookup, visual workflow diagram, and copy any command.

Comprehensive Docker CLI command reference with search, categories, flags, examples, Dockerfile instructions, and reverse lookup.

Complete interactive CSS selector reference with specificity calculator, live preview, searchable categories, and browser support for every selector.

Complete ANSI escape code reference with 256-color palette, true color, text formatting, and copy-ready sequences for Bash, Python, Node.js, Go, and C.

Searchable bash command reference organized by category. File operations, text processing, networking, process management, variables, control flow, and string manipulation.

Complete reference for all 18 React hooks with signatures, parameters, return values, code examples, common patterns, and gotchas.

Complete Linux file permission reference with interactive octal/symbolic converter, umask calculator, ACL guide, and common permission scenarios.

Interactive regex cheat sheet with searchable syntax reference, category filters, live pattern testing, and common regex patterns for JavaScript.

Interactive Vim cheat sheet with search, mode and category filters. Browse 100+ Vim commands for Normal, Insert, Visual, and Command-line modes.

Side-by-side comparison of HTTP/1.1, HTTP/2, and HTTP/3 protocols with feature details, performance characteristics, and migration guides.

Complete HTML5 element reference organized by category with attributes, examples, and semantic usage guide.

Detect and display your browser's API support status across 50+ web platform features including WebGL, WebGPU, Service Workers, and more.

Parse and analyze any User-Agent string to identify browser, OS, device type, rendering engine, and detect bots/crawlers.

Define, track, and visualize web performance budgets for page size, JavaScript, CSS, images, fonts, requests, and Core Web Vitals with charts and presets.

Parse, format, and analyze stack traces from JavaScript, Python, Java, Go, Ruby, C#, and Rust with auto-detection and frame filtering.

Interactive WCAG 2.1 compliance checklist organized by level (A, AA, AAA) and category with progress tracking and exportable audit reports.

Auto-detect screen resolution, viewport size, DPR, media queries, touch support, and responsive breakpoints in real time.

Searchable reference of error codes across HTTP, POSIX, Node.js, MySQL, PostgreSQL, Python, and JavaScript with causes, fixes, and cross-references.

Evaluate mathematical expressions with support for basic arithmetic, functions, and constants.

Convert between units of length, weight, temperature, data size, speed, and more.

Countdown timer to a specific date/time with epoch timestamp display.

Developer-focused Pomodoro technique timer with customizable work/break intervals.

Calculate the real-time cost of meetings based on participants, hourly rates, and duration.

Calculate and track agile sprint velocity for better sprint planning and forecasting.

Estimate story points using Fibonacci, T-shirt sizes, or custom scales with team voting support.

Convert between annual, monthly, biweekly, weekly, daily, and hourly salary rates.

Generate simple invoices for freelancers with PDF export capability.

Simple browser-based Kanban board with drag-and-drop, saved locally in your browser.

Test CSS selectors against HTML markup and see matching elements highlighted.

Build tailwind.config.js visually with custom colors, spacing, fonts, and breakpoints.

Convert Tailwind CSS utility classes to plain CSS code. Paste classes and get equivalent CSS declarations instantly.

Generate design tokens as CSS custom properties, JSON, or SCSS variables.

Find and preview complementary Google Fonts pairings for headings and body text.

Generate responsive img srcset and picture element markup for optimal image loading across devices.

Build CSS media queries visually with support for width, height, orientation, and more.

Build CSS container queries visually with container type, name, and size conditions.

Upload a favicon and preview how it looks at all standard sizes (16, 32, 180, 192, 512).

Encode and decode text using ROT13 or custom Caesar cipher rotation.

Convert text to Morse code and Morse code to text with audio playback.

Convert text to NATO phonetic alphabet representation and vice versa.

Generate creepy Zalgo/glitch text by adding combining Unicode characters.

Reverse text by characters, words, or lines with multiple transformation modes.

Convert text to Braille Unicode characters and Braille back to text.

Convert typed text to handwriting-style images with customizable fonts and paper styles.

Convert regular expressions to NFA state diagrams using Thompson's construction.

Convert emoji to Unicode code points (U+XXXX) and code points back to emoji.

Paste ANSI escape code text and see it rendered with terminal colors and styles.

Visually edit and export resumes in the JSON Resume standard format.

Add AI training opt-out watermarks to images. Protect your artwork with visible text, symbols, and metadata flags.

Embed and extract hidden messages in images using LSB steganography. Invisible to the eye, recoverable with this tool.