Image Compressor
Compress JPG, PNG, and WebP images locally in your browser with an adjustable quality slider.
Reduce the file size of a photo without sending it anywhere. Drop in a JPG, PNG, or WebP, drag the quality slider, and download a smaller version. All processing happens in your browser using the canvas, so your images stay private.
How compression works here
The tool redraws your image onto a canvas and re-exports it at the quality you choose. For JPEG and WebP, lower quality discards fine detail the eye barely notices, which can cut file size dramatically. PNG is lossless, so its savings come from re-encoding rather than quality. Try 0.6–0.8 quality as a starting point — it usually looks identical while saving most of the weight.
Why smaller images matter
Images are the heaviest thing on most web pages. Compressing them speeds up load times, improves Core Web Vitals, saves your visitors' data, and lifts your search ranking. Converting to WebP often shrinks files further than JPEG at the same visual quality.
Lossy versus lossless, in practice
JPEG and WebP are lossy: they achieve small files by discarding detail the eye barely registers, and the quality slider controls how aggressive that is. PNG is lossless: it never throws pixels away, so it's the right choice for graphics with sharp edges, text, or transparency, but its files are larger for photographs. A good rule of thumb is photos to JPEG or WebP at 0.6–0.8 quality, and logos or screenshots to PNG. WebP often beats both at the same visual quality, which is why it's become the default for the modern web.
Balancing quality against file size
Compression trades a little visual fidelity for a lot less weight. JPEG and WebP use "lossy" methods that discard detail the human eye barely registers, which is why a photo can often shrink by 60–80% with no obvious change on screen. The right setting depends on the job: a full-screen hero image can tolerate more compression than a product close-up where texture is the selling point. Nudge the quality down until you can just start to see the difference, then step back one notch.
Frequently asked questions
Are my images uploaded to a server?
No. Everything runs in your browser with the HTML canvas, so images never leave your device.
What quality should I choose?
For photos, 0.6 to 0.8 usually looks identical to the original while saving most of the file size. Lower values save more but start to show artifacts.
Should I use WebP or JPEG?
WebP typically produces smaller files at the same quality and is supported by all modern browsers, so it's a good default for the web.
Will compressing an image reduce its dimensions?
No. Compression lowers file size by re-encoding, keeping the same width and height. To change dimensions, use the image resizer instead.
Can I compress the same image repeatedly?
You can, but with lossy formats each pass discards a little more detail. For best results, compress once from the original rather than re-compressing a compressed file.
Will compressing the same image twice keep shrinking it?
Re-compressing a lossy image mainly adds artefacts rather than useful savings. Compress once from the original; if you need it smaller, resize the dimensions instead.
Last updated: 2026-01-15