Image Compressor

Your browser does all the work: each image is drawn onto a canvas at your chosen size and re-encoded as JPEG, WebP, or PNG using canvas.toBlob(). Your files are never uploaded to a server, queued, or stored anywhere — the compression happens entirely on your own device.

Start by resizing: shrinking a 4000px photo to the 1200px it will actually be displayed at often removes 80% or more of the file size with zero visible change. Then use WebP at 80-85% quality, which looks identical to the original for most photos. Only drop quality below 70% if you truly need the smallest possible file.

Choose WebP in the output format dropdown above, then download each image. WebP is supported by all modern browsers and typically produces files 25-35% smaller than equivalent-quality JPEGs, making it the best default choice for photos on the web.

PNG is a lossless format — it keeps every pixel exactly, so there is no quality setting to adjust. The slider only applies to JPEG and WebP, which are lossy formats where lower quality means a smaller file. Pick PNG when you need pixel-perfect output, like screenshots with text or graphics.

No artificial limits — compress as many images as you like, one after another. The only real constraint is your device's memory: extremely large photos (tens of megapixels) on a low-memory phone may struggle, in which case compress a few at a time.

No. Everything runs in JavaScript in your browser on your own device. Your images never leave your computer or phone — there is no server, no upload queue, and nothing is stored or tracked.