Image Compressor

You drop or paste one or more images onto the tool and it re-encodes them right in your browser using the HTML5 Canvas API. You control the output format (original, JPEG, WebP, or PNG), the quality level (5–100%), and optional resizing (percentage scale or a maximum width). The tool then shows you a side-by-side before/after preview, the new file size, and the exact percentage saved before you download anything. Re-encoding with a lower quality setting and, when possible, switching to WebP are the two things that shrink file sizes the most.

Yes — 100% private. Compression is performed entirely on your own device using JavaScript and the Canvas API. Your images are never uploaded to any server, so screenshots, ID photos, or confidential documents never leave your computer. You can even use the tool offline after the page has loaded.

For photos and detailed images, JPEG or WebP at quality 70–85% gives excellent results with very small files. WebP is the modern choice: it usually beats JPEG at the same size while supporting transparency. Use PNG only when you need pixel-perfect lossless output, such as logos, icons, screenshots of text, or images with transparency. When in doubt, start with "Original" and just lower the quality slider — if that isn't enough, switch to WebP.

For web use, quality 70–85% is the sweet spot: file sizes drop dramatically while compression artifacts stay nearly invisible. Below 60% you may start to see banding in smooth gradients and softness around edges. Because the tool shows a live before/after preview, you can always compare the compressed image side by side with the original and pick the highest quality that still looks great at the size you need. Keep in mind that once an image is compressed, the lost detail cannot be recovered.

Yes. The tool supports batch compression: drop or select several images at once, tweak the settings, and every image is re-encoded with the same format, quality, and resize options. A summary bar shows the combined original size, the combined compressed size, and the total savings across the whole batch, and the "Download all" button saves every compressed image with an automatic "-compressed" filename.

PNG is a lossless format, so it cannot be "tuned down" the way JPEG or WebP can — re-encoding a PNG without changing its dimensions usually keeps the size about the same, and it can occasionally grow slightly. If a PNG gets bigger, the real fix is to switch the output format to WebP or JPEG, or to resize the image. The savings badge on each result card turns orange whenever a compressed file is larger than the original, so you can always spot this and adjust your settings.

Usually, yes — and by a lot. File size scales roughly with the number of pixels, so halving both dimensions (25% of the pixel count) typically cuts the size by 60–80% even before quality compression kicks in. A 4000×3000 smartphone photo is far more than most websites need; downsizing to a 1920px maximum width produces a file that is dramatically smaller and loads much faster, with no visible difference on screen. Use the "Max width" resize option for this.

JPEG does not support transparency, so when you convert to JPEG the tool flattens the image onto a white background first — that is what virtually every compressor and photo editor does. If you need to keep transparent areas, choose WebP or PNG instead. WebP gives you transparency AND strong compression, which makes it the best choice for logos and icons with alpha channels.