Compress Image — free, private, in your browser

How to compress an image

Shrinking your images takes just a few seconds, and everything happens right here in your browser:

1. Add your images. Drag JPG, PNG or WebP files onto the drop zone above, or click Choose images to pick them. You can add as many as you like at once.
2. Adjust the settings. Drag the quality slider to trade size for fidelity, optionally pick an output format (keep original, JPEG, WebP or PNG), and set a max width if you want to resize large photos down.
3. See your savings. Each image shows its original size, the compressed size, and the percentage saved, with a live preview. Tweak the slider and it re-compresses instantly.
4. Download. Use each image's Download button, or click Download all (ZIP) to grab the whole batch at once — all created on your own device.

Why compress images

• Faster pages & emails. Smaller images load quicker on websites and attach without bouncing past mailbox limits.
• Fit upload limits. Many forms, portals and apps cap file size — compression gets a big photo under the limit without an obvious quality drop.
• Save storage & data. Lighter files take less space on your device and cloud, and use less mobile data to share.
• Privacy by design. Because this compressor is fully client-side, sensitive photos and documents never touch a server.

Private and offline by design

Most online "compress image" sites upload your photos to their servers to do the work. This one doesn't. It draws each image to an HTML canvas and re-encodes it with canvas.toBlob directly in your browser, so your files never leave your device — you can even disconnect from the internet after the page loads and it still works. For heavier, repeatable jobs on Windows — OCR on scans, editing and merging PDFs, or processing folders of files in bulk — try Kaizen OCR & PDF.

Frequently asked questions

No. The compression happens entirely inside your browser using the HTML canvas and the canvas.toBlob method. Your images never leave your device and are never sent to any server, so private photos and documents stay completely private.

It depends on the image and the quality you choose. Photos (JPG and WebP) usually shrink the most — often 50–80% smaller at quality around 0.7 with little visible loss. The tool shows the original size, the compressed size, and the percentage saved for every image.

JPG and WebP are lossy and best for photos, with WebP usually giving the smallest files. PNG is lossless and best for graphics, logos and screenshots with sharp edges or transparency. Use Keep original to stay in the same format, or switch to WebP for the smallest size.

Yes — completely free and unlimited, with no signup and no watermarks. It runs locally in your browser, so you can compress as many images as you like.