Krisox
Tools Add to Chrome

Compress PDF to 100 KB

Get a PDF under 100 KB, compressing only as much as needed. 100% private: it never leaves your device.

About this tool

Strict application portals often cap supporting documents, such as certificates and ID scans, at 100 KB. This tool compresses the images inside your PDF just enough to fit under 100 KB, and leaves typed text untouched. It runs in your browser, so the document is never uploaded anywhere.

Always at or under 100 KB

The result is never over the limit: it's at or under 100,000 bytes, or the tool tells you the smallest it can get with the pages still readable. Counting a KB as 1,000 bytes keeps it under the limit on sites that count 1,024 too.

What 100 KB looks like

  • A 3-page A4 scan at 300 dpi (8.8 MB) became 93.4 KB (93,360 bytes).
  • A 10-page PDF of phone photos (40.1 MB) couldn't get under 100 KB with its pages still readable; the smallest was 179.3 KB. Long scanned documents need a larger limit, or splitting.
  • Typed PDFs (from Word, Google Docs and the like) are mostly text, which takes little room: they are often already under the limit, and the tool then leaves them unchanged.

Tips for 100 KB

  • One or two scanned pages fit at 100 KB; long documents usually don't. Upload only the pages the form asks for.
  • Scan in black and white or grayscale if the portal allows it: colour pages take far more room.
  • Typed PDFs (exported from Word or Google Docs) are often already under 100 KB.

100% private

Most PDF compressors upload your document to their servers. This one works inside your browser tab: your certificate, ID scan or contract is never uploaded to Krisox or anyone else.

Questions

Will the text stay sharp?

Typed text, the kind you can select, isn't touched: only images are compressed. Scanned pages are images, so at small sizes they soften a little. Zoom in on the result before you submit it.

What if my PDF can't get under 100 KB?

The tool says so, and tells you the smallest it can get. Upload only the pages the form needs, scan in grayscale, or split the document into parts.

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

Sites differ. The tool aims under the smaller figure, 100,000 bytes, so the result fits either way.

Fix "file too large" errors on government portals · Fit your resume under Workday's upload size limit · Compress PDFs inside Canvas assignment uploads