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Compress image to 100KB

Prepare a 100KB copy for a page or message, then judge it at the size people will actually see. Keep the source for future edits.

Sample
A sample photograph, before and after compressing to 100 KB
359.5 KB
81.5 KB
Drag the divider. Left is the 359.5 KB original; right is what this page produces from it— 81.5 KB. Both halves are shown reduced in size and delivered as WebP; the tool writes JPEG, which looks slightly softer at the same byte count. Drop your own file anywhere on this preview, or pick a sample nearby, to run it for real.
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Mechanism

How the 100 KB compression process works

The search starts with a 102,400-byte ceiling. Sources above it are re-encoded as JPEG; optional downscaling is tried if quality alone is insufficient. The result panel shows whether dimensions changed and whether the target was reached. The byte budget alone does not predict visible quality.

Limits

Where compressing an image to 100 KB falls short

  • Text, logos and photographic detail can show compression artifacts. Check at your intended display size and at full size when fine detail matters.
  • Re-encoded results do not retain the source EXIF. Sources already within the target keep their original bytes and metadata.
Questions

Questions about compressing an image to 100 KB

Will my image dimensions shrink at 100KB?

They can, if resolution reduction is enabled and the quality search needs it. The output dimensions tell you what happened; do not assume a particular source will fit at full size.

How do I keep an editable original?

Keep the source file separately. Downloading a compressed copy does not overwrite your original, but that copy is not a substitute for the source when making later edits.

Is a 100KB file suitable for a website hero image?

Preview it at the intended display size. A byte limit does not specify enough pixels or acceptable sharpness for every layout or screen.

Can I prevent resolution reduction?

Yes. Untick the resolution-reduction option. The tool then reports a missed target if its quality search cannot reach 100KB at the original dimensions.