What quality setting should I use?

For photos on the web, somewhere around 70–80% is usually indistinguishable from the original at a fraction of the size. You can see the result before you commit.

Does compressing a JPEG twice make it worse?

Yes — JPEG is lossy, so each re-encode loses a little more. Always compress from the original rather than from a compressed copy.

Compress JPEG Images

Make JPG and JPEG photos smaller while choosing exactly how much quality to trade. Everything runs in your browser, so nothing is uploaded.

Runs entirely in your browser — your file is never uploaded.

Questions

What quality setting should I use?: For photos on the web, somewhere around 70–80% is usually indistinguishable from the original at a fraction of the size. You can see the result before you commit.
Does compressing a JPEG twice make it worse?: Yes — JPEG is lossy, so each re-encode loses a little more. Always compress from the original rather than from a compressed copy.

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