CompressThis

Compress a PDF to 100 KB.

For the tightest upload limits.

Free tool

Open the tool — drop a PDF, get a smaller one back in seconds.

Compress to 100 KB

The problem

100 KB is a very tight ceiling — about the size of a small JPEG photo. Some older government portals, legacy insurance systems, and certain scholarship applications enforce limits this low. Getting a scanned document under 100 KB without making it illegible is a real compression challenge. Not every document can do it gracefully.

The fix

CompressThis will try. Maximum mode + target-size mode at "95 KB" will apply the most aggressive image resampling available (600px / 45% JPEG quality) plus object stripping and linearization. Single-page text-only documents usually land at 50–90 KB. For multi-page documents, the math gets harder — you may need to split the PDF and submit pages individually, or consider if the portal accepts image formats instead.

What you get

  • Maximum mode + target-size "95 KB" applies the most aggressive compression available.
  • Single-page typed/printed text typically compresses to 40–90 KB with readable output.
  • Single-page handwritten forms: 60–120 KB — may not hit 100 KB with readable quality.
  • Multi-page documents: consider splitting and uploading pages separately.
  • Preview before submitting — at this level of compression, readability should be verified.

Questions

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Why is my PDF so large?
Five reasons — and the fix for each.

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Compress to 100 KB

Last updated: May 2026

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