Are my photos uploaded?

No — never. Compression runs in your browser using a Web Worker. The image bytes never touch our server. Open the network tab if you want to verify: zero requests fire when you click Compress.

How much can I shrink an image?

Typical results: 60–80% smaller for photographs at quality 0.7, with no perceptible quality loss. Screenshots and graphics with sharp edges compress less aggressively because lossy formats trade detail for size.

Which formats are supported?

JPEG, PNG, and WebP — both as input and output. WebP usually gives the smallest file at equivalent quality and is supported by every modern browser.

Why does my PNG get bigger when I compress it?

PNG is lossless. If your input is already optimised, re-encoding it as PNG won't shrink it — and may add metadata. Convert to WebP or JPEG for serious size reductions.

Is there a file-size limit?

Practically, the limit is your browser tab's memory. Phones can handle 20–30 MB images comfortably; desktops easily handle 100 MB+. Very large RAW images may need to be downscaled first.

Files never leave your device

Compress Images Online

Compress JPG, PNG, and WebP images with a quality slider. Compare before / after sizes side-by-side.

Drag and drop files here

or click to browse

JPG, PNG, WebP — multiple files supported

Quality: 70%

Max width / height (px)

Output format

How to use Image Compressor

Drop one or more images into the upload area, or click to browse.
Adjust the quality slider — lower values shrink the file at the cost of fidelity.
Optionally cap the maximum width or output format.
Click "Compress" — the tool processes each image locally.
Download individual results, or grab them all as a ZIP.

Why compress in the browser?

Image compression is a CPU-bound task — server-based compressors charge for the cycles. Modern browsers expose the same canvas-encoding routines that desktop apps use, and your phone or laptop has plenty of CPU sitting idle. Doing it locally means it's free, instant, and private.

JPEG vs WebP vs PNG

JPEG — best for photographs. Mature, universally supported, lossy. Quality 0.7–0.85 is the sweet spot for the web.
WebP — Google\'s newer format. Roughly 25–35% smaller than JPEG at equivalent quality, with better gradients and an alpha channel. Supported everywhere except some older email clients.
PNG — lossless. Use for screenshots, line art, and anything with transparency that needs pixel-perfect fidelity. Don't expect dramatic size reductions.