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Image Compressor
Reduce image file size with a quality slider, free, in your browser. See the before and after size side by side — your photo is never uploaded to any server.
Example: a photo-like 800 by 600 test image saved as JPG at quality 0.95 was 339.1 KB; at quality 0.70 it was 112.7 KB — 66.8% smaller, and still fine to look at.
Your compressed imageReady to download
Pick an image, set the quality, and press Compress image. The before and after sizes appear here, with a download link.
How to compress an image
- Click the box above, or drag your image onto it. JPG, PNG and WebP all work.
- Move the quality slider. Lower quality means a smaller file; 0.80 is a good middle ground for photos.
- Press Compress image. The tool re-saves the photo in your browser.
- Compare the before and after sizes in the panel on the right, then download the result. If it still looks fine, you are done — if not, try a higher quality.
Worked example — 339.1 KB down to 112.7 KB
We tested the slider on a photo-like 800 by 600 test image. Saved as a JPG at quality 0.95, it was 339.1 KB. The same image at quality 0.70 was 112.7 KB — a saving of 226.4 KB, or 66.8% smaller. On screen, the two look close; the difference shows only if you zoom in tight on fine detail. That is the trade the slider makes: a little fine detail for a much smaller file that loads faster and is easier to send.
Frequently asked questions
How can I compress an image without losing quality?
You cannot shrink a photo with zero change — some detail always goes. But down to about quality 0.80, most photos look the same at normal size. The trick is to check the result on screen before you keep it, and only go lower if the file is still too big.
How much can an image compressor shrink a photo?
It varies a lot. Our test photo went from 339.1 KB at quality 0.95 to 112.7 KB at quality 0.70 — 66.8% smaller. Photos with lots of fine detail shrink less; plain or flat images shrink more.
What quality should I use for a photo?
0.80 is a good middle ground for photos on the web. Use 0.90 or higher for a photo you plan to print, and 0.60 to 0.70 when the file just has to be small, like an email attachment.
Does compressing a PNG work the same way?
PNG is a lossless format, so the quality slider does not apply to it the same way. For the biggest saving, compress to JPG or WebP instead — the tool saves the result as JPG by default.
Is my image uploaded anywhere?
No. The compression runs fully in your browser with the built-in canvas. Your photo never travels over the internet.
Your files never leave your device. This tool runs fully in your browser. Your files are not uploaded to any server, not stored anywhere, and not seen by anyone else. Close the tab and they are gone.
Sources and method. Canvas API (built into the browser). Worked example measured with real files: the same 800 by 600 test image saved as JPG at quality 0.95 measured 339.1 KB and at quality 0.70 measured 112.7 KB — a 66.8% saving.