Reduce the file size of your images without losing visible quality. Upload a photo, dial in the quality slider, and download the optimised result. Everything runs in your browser — your images never leave your device.
Open Image Compressor → free, no sign-inImage files from modern cameras and phones are enormous — a single photo can easily be 5–10 MB. That's fine sitting on your hard drive, but it causes real problems when you're uploading to a website with a 2 MB limit, attaching to an email, or sharing via a messaging app.
The Image Compressor reduces file size by adjusting the JPEG quality level — the main dial that trades visual fidelity against file size. At 85% quality, most photos are visually indistinguishable from the original while being 60–80% smaller. You can preview the result before downloading so you know exactly what you're getting.
Unlike most online compressors, this tool never uploads your images to a server. Compression happens entirely in your browser using the Canvas API, so your photos stay on your device.
A quality setting of 80–85% is a good starting point for most photos. Drop it further only if you still need a smaller file.
Your photos never leave your device. Most online image compressors upload your file to a remote server, process it there, and send it back. That means your private photos — documents, medical images, personal shots — pass through someone else's infrastructure. This tool processes everything locally using your browser's built-in Canvas API.
You control the quality, not an algorithm. Automated compressors make a guess at the right quality level. A manual slider means you decide exactly where to land on the size vs. quality spectrum — which matters when you're hitting a specific file size limit, not just "make it smaller".
No account, no watermarks, no limits. Many free online compressors watermark the output or cap usage without a subscription. This tool has none of that.
Does compressing an image reduce quality?
It depends on how much you compress. At 80–90% quality, most photos look identical to the original while being significantly smaller. Lower settings reduce size further but introduce visible artefacts. The slider lets you find your own sweet spot.
Are my images uploaded to a server?
No. All compression happens in your browser using the Canvas API. Your images never leave your device.
What image formats does it support?
JPEG, PNG, and WebP as input. Output is downloaded as a JPEG, which delivers the best compression ratio for photographs.
How much can I reduce the file size?
Typical results are 50–80% smaller at high quality settings. A 4 MB photo often compresses to under 600 KB with no visible loss.
Can I compress multiple images at once?
This tool handles one image at a time. For processing many images in one go, try the Bulk Image Converter.
Is there a file size limit?
There is no server-side upload limit. The only constraint is your device's available memory, which handles the vast majority of photos without issue.
Free. Instant. No sign-in. Open it and get the job done.
Open Image Compressor on Doathingy.com →