JPG compressor — free online tool

Compress a JPG at quality 78 by default, or anywhere from 20 to 95. Other image types dropped here are converted to JPG on a white background.

Compress images

Control quality, size, and format in one batch.

What to know

JPG compression is a trade between file size and visible artifacts. The encoder splits the picture into small blocks and discards fine detail, and the quality slider decides how much. From the default of 78 you can move down to 20 or up to 95; the useful range for photographs is usually somewhere between 60 and 85, where size falls quickly while the picture still looks natural.

Artifacts show up first around text, thin lines and sharp color edges, as halos and blocks, while smooth sky or skin stays clean much longer. That is why the same slider value can look perfect on a landscape and rough on a screenshot saved as JPG. If the preview shows fuzz around lettering, nudge the value up by 5.

The output format is fixed to JPG on this page. A PNG or WebP dropped in is redrawn on a white background and encoded as JPG, because JPG has no transparency; transparent logos therefore get a white box. Files that are already JPG are only re-encoded, and if the result is not smaller at identical dimensions the original is returned instead.

Each JPG save is lossy, so compress from the best original you have rather than from a previously compressed copy. To go lower than quality alone allows, tick Resize before compressing: a 4000 x 3000 photo at 50% is 2000 x 1500, a quarter of the pixels, before the quality setting even applies.

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How to use JPG compressor — free online tool
  1. Drop one or more JPG files into the page; the output format is already locked to JPG.
  2. Start with Quality 78 and look at the size shown for each file.
  3. Lower it by 5 to 10 at a time, or raise it to 85 if text looks fuzzy.
  4. Download the compressed JPGs and open one at 100% to check lettering and edges.

Quick answers

What is a safe JPG quality for photos on a website?

Most photos look clean between 70 and 85. Below 60 the blocky 8 x 8 patterns become visible in skies and skin tones.

Why does my screenshot saved as JPG look bad after compression?

JPG handles flat colors and sharp text poorly. Keep screenshots as PNG, or use a higher quality such as 90 if JPG is required.

What happens if I drop a transparent PNG here?

It is flattened onto white and saved as JPG, so the transparent area becomes white. Use the PNG or WebP compressor to keep transparency.

Can compressing a JPG make it bigger?

It can, if the file was already saved at a lower quality than the one you chose. The tool detects that and returns your original untouched.