Compress JPEG
JPG quality is one dial: turn it down and the photo gets smaller, turn it too far and it starts to look rough. Pick a setting, or name a size and let it find the best quality that still fits. The side by side view shows you exactly where it starts to show.
How to use it
- 1 Add your JPG or JPEG files.
- 2 Set a quality value, or say how small the file needs to be.
- 3 Zoom into a detailed area to check the result against the original.
- 4 Download the compressed photos.
Formats this tool accepts
Each one has a reference page covering what it stores and where it is supported.
Questions about compress jpeg
What JPEG quality should I use?
Quality 80 to 85 is the usual sweet spot for photographs on the web, and 90 or above is close to indistinguishable from the source but much larger. Below about 60 you start seeing blocking in flat areas such as skies and halos around sharp edges.
Does re-saving a JPEG damage it?
Yes. JPEG is lossy, so each save discards a little more and the damage accumulates across generations. Compress from the highest quality copy you have rather than repeatedly compressing an already compressed file.
Can I compress a JPEG without losing anything?
Not through re-encoding. There are lossless JPEG optimisations that rearrange the existing data, and they typically save five to fifteen percent. Anything beyond that involves throwing away image information.
Are my files uploaded to a server?
No. The whole thing runs inside the browser tab you already have open. Your file is read straight from your own disk, worked on there, and handed back as a download. Nothing is sent anywhere, nothing is stored, and there is no account and no queue.
Is there a file size limit?
There is no server-side limit because there is no server. The practical ceiling is your device memory, since the file and its output both have to fit in the tab. Files up to a few hundred megabytes are usually fine on a desktop machine, while phones and older laptops will struggle sooner. If a large file fails, close other tabs and try again.
Does it work offline?
Yes, once the page has loaded once. The engine is cached by the browser, so you can turn off your connection, reload the page and keep working. That is a useful side effect of doing the processing locally rather than a separate offline mode you have to enable.
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