Image Compressor

Drop a photo, pick a format and a quality, get a smaller file back. The compression runs on your device — the original never leaves the tab.

How this works

• Drop a raster image — PNG, JPEG, WebP, GIF, BMP, AVIF, or HEIC. The file is read in your browser with FileReader; nothing is uploaded.
• The image is decoded into an offscreen <canvas> sized to fit your Max width (or the original size if you leave it at 0).
• JPEG and WebP are lossy — lower quality means smaller files but visible artefacts. PNG is lossless; the quality slider is disabled for it.
• The browser re-encodes the canvas via canvas.toBlob with your chosen format and quality. The result lands on the right, with byte counts and the savings ratio.
• Hit Download when you're happy. The output filename keeps the original stem and swaps the extension to match the chosen format.
• Everything runs locally. There's no server, no upload, no analytics. The whole compressor works offline once the page is loaded.