How to compress a PDF to 100 KB
- Add your PDF above. The target is already set to 100 KB.
- Click Compress PDF. The tool rebuilds the pages at the highest quality that still fits under 100 KB, trying sharper settings first.
- Download the result and open it once to check that every page is readable before you submit it.
Who asks for a PDF under 100 KB?
A 100 KB limit is common on older government, exam and scholarship portals, where each document slot (ID proof, mark sheet, caste or income certificate, address proof) has its own small limit. These forms usually reject anything larger without telling you why, so it is worth hitting the target with a little room to spare.
What quality to expect at 100 KB
100 KB is tight. It is plenty for a one or two page scan of a certificate or ID: text stays readable on screen and when printed. For longer documents the tool has to lower the resolution further, and small print can become soft.
| Pages (scanned) | Typical result under 100 KB |
|---|---|
| 1 page | Sharp, close to the original |
| 2–3 pages | Clear text, slightly softer photos |
| 4–6 pages | Readable, but small print gets soft |
| 7+ pages | Often too tight: split the file first |
Tips if it will not fit
- Upload only the pages they ask for. Use Split PDF to keep just the relevant pages, then compress.
- Rescan in greyscale at 150–200 dpi. Colour scans of white paper waste most of their bytes.
- Crop the margins of photographed documents before turning them into a PDF with JPG to PDF.
- If the portal accepts a JPG instead, a single page usually looks better as an image: try Compress image to 100 KB.
Frequently asked questions
Will the compressed PDF be exactly 100 KB?
It will be under 100 KB, usually somewhere between 60 and 100 KB. The tool stops at the best quality step that fits rather than padding the file.
Can I still select or search the text?
No. To reach very small sizes the pages are stored as optimised images. Keep your original PDF if you need selectable text.
Is my document uploaded anywhere?
No. Compression runs entirely in your browser, so ID cards and certificates never leave your device.
What if it says it could not get under 100 KB?
You still get the smallest version it could make. Remove pages or rescan in greyscale, then try again.
Other sizes
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Last reviewed: 2026-11-10. Tools are provided as-is. Keep a copy of important originals. See our disclaimer.