CleanorTools
JPEG

Compress JPEG

Details

How to use Compress JPEG

What the tool does, how to run it, and what to expect from the result.

How to compress a JPEG

To compress a JPEG, add your JPG, set the quality level, choose the chroma subsampling, decide whether to use progressive output, and export the new file. All of it runs in your browser, so the image stays on your device throughout.

The quality slider trades file size for fidelity, while chroma subsampling controls how color detail is stored. Use 4:4:4 to keep full color resolution for graphics and text, or 4:2:0 for smaller files on typical photos. Progressive mode lets the image load in increasing detail, which can feel faster on slow connections.

  • Drop the JPG in, or click the dropzone to choose it
  • Move the Quality slider: it starts at 82, and 80 to 85 is where most photos live
  • Compare the before and after preview at 100% before you accept it
  • Export the compressed JPG locally, with nothing uploaded

Why this beats a one-button JPEG compressor

A basic compressor is about getting a file smaller fast with one button. This one is for people who care about the underlying JPEG tradeoffs and want to control them directly, rather than accepting a black-box result.

That control matters when you are optimizing hero images, comparing settings, or preparing assets where color fidelity and load behavior both count. You can experiment with quality, subsampling, and progressive mode until the size-versus-quality balance is right.

Is this JPEG compressor free and private?

Yes. Compressing a JPEG here is free with no sign-up, no watermark, and no usage limits.

It is private because the compression and export happen locally in your browser. Your JPEG is never uploaded to a server, so it stays on your device.

Tips

Getting a better result out of Compress JPEG

Specific settings and thresholds, not general advice.

  • The slider starts at 82, and 80 to 85 is where almost every photograph belongs. Above 90 you are paying a real size premium for a difference nobody can see; below 70 the artefacts start showing on skies and skin.
  • Judge at 100%, never zoomed out. JPEG artefacts are invisible at 50% and obvious at full size, which is exactly how a bad export reaches production.
  • Recompressing an existing JPG always costs quality. Go back to the original PNG, RAW or HEIC if you still have it, and encode once at the setting you actually want.
  • If the file is still too big at quality 80, the problem is the resolution, not the quality. Resize first: halving the width quarters the pixels and beats any slider.
  • Consider AVIF instead. Our benchmark measured it 37% smaller than JPEG at matched quality, and up to 52% on photographs, which no JPEG setting can match.
Limits

What Compress JPEG does not do

The honest boundary, so you do not lose time finding it yourself.

  • It does not resize or crop.
  • It cannot recover quality the JPG already lost. Each pass costs more.
  • It does not remove artefacts. That is the JPG Artifact Remover.
  • It does not convert to another format.
Reference

Terms used on this page

Short, plain-language definitions for the formats and settings above.

Files & formatsJPEGJPEG (.jpg) is the most widely supported photo format. It uses lossy compression to shrink photographs dramatically, trading a small amount of detail for much smaller files. It has no transparency and is larger than newer formats like HEIC or WebP at the same quality.GeneralPhotos & videoChroma subsampling (4:2:0)Chroma subsampling saves space by storing full brightness detail but fewer color samples, exploiting the fact that human eyes notice brightness more than color. Notations like 4:2:0, 4:2:2, and 4:4:4 describe how much color information is kept — 4:2:0 keeps the least and is the most common.General
At a glance

Who Compress JPEG is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

Developers, performance-minded publishers, and image-heavy teams who want more control than a normal image compressor exposes

Ideal for

Technical JPEG tuning when file size, progressive output, and chroma handling all matter together

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

What is chroma subsampling and which should I choose?

Chroma subsampling controls how much color detail is kept. Use 4:4:4 for full color on graphics and text, or 4:2:0 for smaller files on regular photos.

What does progressive mode do?

Progressive JPEG loads the image in increasing detail rather than top to bottom, which can feel faster on slow connections. You can toggle it on or off before export.

Does it upload my JPEG to a server?

No. The compression and export run entirely in your browser, so your JPEG stays on your device.

Is this JPEG compressor free?

Yes. It is completely free with no sign-up, no watermark, and no limit on how many files you compress.

Does it work on mobile?

Yes. The recompressor works in any modern mobile or desktop browser because all encoding happens locally on your device.

What JPEG quality should I use?

80 to 85 for a photograph. The slider starts at 82. Above 90 the file grows for a difference nobody can see, and below 70 the artefacts start showing on smooth areas like skies and skin.

Does recompressing a JPG make it worse?

Yes, every time. JPEG is lossy, so each save discards a little more. If you still have the original PNG, RAW or HEIC, encode once from that rather than re-saving a JPG.

The file is still too big at quality 80. What now?

Resize it. The resolution, not the quality slider, is what is costing you: halving the width quarters the pixel count and beats anything the slider can do.

Is there a better format than JPEG?

Yes. Our own benchmark measured AVIF at 37% smaller than JPEG at matched quality, and as much as 52% on photographs. If the destination takes AVIF, no JPEG setting will compete.

Why does my JPG look fine here but bad after upload?

Because you judged it zoomed out. JPEG artefacts hide at 50% and appear at 100%, and platforms usually recompress on top of what you sent them.

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