Image Compressor

The Image Compressor is a free, browser-based tool that lets you reduce the file size of JPEG, PNG, and WebP images without installing any software. Whether you need to optimize images for a website, shrink an attachment for email, or batch-prepare thumbnails, this tool handles it quickly and privately.

All compression happens entirely on your device using the HTML5 Canvas API. When you upload an image, it is read into memory via the FileReader API, drawn onto an off-screen <canvas>, and then exported using canvas.toBlob() with your chosen MIME type and quality level. For JPEG and WebP, the quality parameter controls the lossy compression ratio. PNG is a lossless format, so the quality slider does not affect PNG output — but resizing still works.

Because processing is entirely client-side, your images are never uploaded to a server. There are no network requests, no storage, and no third-party services involved. This makes it safe for sensitive images such as scanned documents, ID photos, or proprietary design assets. The tool works offline once the page is loaded.

You can optionally resize images by specifying a maximum width or height. The tool maintains the original aspect ratio, scaling proportionally so your images are never distorted. Combine resizing with quality adjustment to achieve significant file size reductions — often 60-80% smaller — while maintaining acceptable visual quality for web use.

The results panel provides a side-by-side comparison of the original and compressed images, along with a visual progress bar showing the size reduction. You can instantly download the compressed image or copy the statistics to share with your team.

1. Drag and drop an image onto the upload zone, or click it to browse your files. Supported formats are JPEG, PNG, and WebP.
2. Review the original image preview, file size, and dimensions displayed beneath the thumbnail.
3. Adjust the Quality slider (1-100%) to control compression level. Lower values produce smaller files but reduce visual quality. This setting applies to JPEG and WebP only.
4. Optionally enter a Max Width or Max Height in pixels to resize the image proportionally.
5. Choose an Output Format to convert the image, or leave it as "Same as input" to keep the original format.
6. Click Compress to process the image. The compressed preview and size comparison will appear.
7. Click Download to save the compressed image, or Copy Stats to copy the size comparison text. Use Ctrl+Shift+C as a keyboard shortcut.
8. Click Reset to clear everything and start over with a new image.