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Compress PDF to 100 KB

Many online application forms accept documents only up to 100 KB. Choose your PDF and the compressor aims for 100 KB, then shows the exact result before you download it.

Processed on your device. Nothing is uploaded. How we know

How to approach a 100 KB limit

100 KB is a common limit for certificates, mark sheets and ID proofs. For a single scanned page it is usually comfortable: in our tests a typical A4 scan kept around 100 dpi, which reads cleanly on screen and prints acceptably.

Two or three scanned pages can also fit, but they share the space, so each is reduced further (to roughly 60–72 dpi in our tests). Normal text stays readable; check small print. Typed documents with real text rarely need much compression at all.

Steps for a 100 KB upload

  1. Read the form's rule

    Note whether 100 KB applies per file, and which pages the form actually needs.

  2. Choose the PDF

    The compressor starts with a 100 KB target, which you can change.

  3. Let it find the best fit

    It measures real results and keeps the highest quality that still fits, so you lose no more detail than necessary.

  4. Check small print

    Zoom in before uploading. If it's too soft, drop a page or rescan in grayscale.

What usually fits in 100 KB

  • A one-page scan, such as a certificate, ID proof or a single mark sheet, at a resolution that reads cleanly on screen.
  • Two or three scanned pages at a softer, screen-only resolution.
  • Short typed documents whose fonts are already compact.

When 100 KB is hard to reach

  • Scans of five pages or more: each page is an image, and they all have to share 100 KB.
  • Colour photos and full-colour brochures.
  • PDFs with large embedded fonts or many drawings, which image compression can't reduce. The tool tells you if this is the case.

If your PDF won't go under 100 KB

  • Rescan in grayscale or black and white, at 150 dpi or lower, and crop the empty margins.
  • Upload only the pages the form asks for. Split long documents if the form allows several files.
  • Check the exact limit. Some forms say 100 KB but accept up to 102,400 bytes; our 100 KB target is 100,000 bytes, so it passes either way.

Learn more: How to compress a PDF

Frequently asked questions

Will text stay readable at 100 KB?

Text that is real text in the PDF (not part of a scan) is never touched, so it stays sharp. In scans, the text is part of an image; at 100 KB small print can look softer, especially across several pages, so check the result before uploading.

Is 100 KB counted as 100,000 or 102,400 bytes?

Forms differ. We aim for 100,000 bytes, which also satisfies forms that count 1 KB as 1,024 bytes. The exact byte count is shown with the result.

Why does the tool say 100 KB isn't possible?

Text, fonts and drawings take space that compressing images can't remove. When they alone exceed 100 KB, the tool says so and offers the smallest version it could make.

Compress to a specific size

Pick the limit your upload form asks for. The compressor opens with that target already set.