Free online file tools — no uploads, your files never leave your browser
Every tool in this group does its work inside your browser: the image is decoded by your device, re-encoded by JavaScript, and handed straight back to you. Nothing is uploaded, which means no waiting on a server queue, no file size caps set by somebody else's disk, and no copy of your photo on a machine you do not control.
The target-size tools (compress to 20KB, 50KB, 100KB…) exist because forms reject uploads by bytes, not by beauty. They search for the highest JPEG quality that still fits your target, shrinking dimensions only when quality alone cannot get there — so the result is always the best-looking file that passes the gate, at or just under the limit.
| Tool | When to use it |
|---|---|
| Compress to exact KB | A form, portal or exam site rejects files over a fixed size |
| Compress JPEG | You want to see the size/quality trade-off live and pick it yourself |
| Compress PNG | You must keep lossless quality or transparency and can accept fewer pixels |