Many application portals — exams, scholarships, banks and government services — only accept PDFs up to 100 KB. Add your PDF and click Compress: the tool tries different quality levels and keeps the best-looking version that fits under 100 KB.
Tips for the best result
- Single-page documents (certificates, ID proofs, mark sheets) fit easily under 100 KB.
- For multi-page scans, remove extra pages first with Remove pages — fewer pages means better quality.
- Turn on Black & white for scanned text documents; it keeps them readable at small sizes.
How to compress PDF to 100 KB
- Select or drop your PDF (you can add several).
- Pick a compression level — or choose Exact size and type the limit, e.g. 200 KB.
- Click Compress PDF.
- Download the smaller PDF. We show you exactly how much space you saved.
Why use PDFNest to compress PDF to 100 KB
- Hit an exact sizeType 100 KB, 200 KB or 1 MB and we find the best quality that fits.
- See your savingsBefore and after size is shown, so you know it worked.
- Black & white optionTurn colour scans into grayscale for even smaller files.
- Stays on your deviceCompression runs in your browser — your PDF is never uploaded.
Frequently asked questions
How can I reduce my PDF size to 100 KB?
Add your PDF on this page — the limit is already set to 100 KB — and click Compress PDF. Download the result; it shows the new size so you can check it's under 100 KB.
My PDF is still above 100 KB. What can I do?
Remove pages you don't need, tick Black & white, or split the document and upload the parts separately if the form allows it. Very long PDFs can't always look good at 100 KB.
Will the text still be readable?
For one or two pages, yes. The tool picks the highest quality that still fits, so text stays as sharp as possible.
Can I compress a PDF to 100 KB on my phone?
Yes, it works in your phone's browser. The compressed file is saved to your Downloads.
How do I reduce a PDF to 200 KB (or 100 KB)?
Add your PDF, choose "Exact size (KB / MB)", type 200 (or 100) and click Compress PDF. The tool tries different quality settings and gives you the best-looking version that fits under your limit.
Which compression level should I choose?
Recommended works for most files. Choose Extreme if you need the smallest possible size, Light if you must keep text selectable (for example a contract), or Exact size when a website gives you a maximum file size.
Why can't I select text after compressing?
The Recommended, Extreme and Exact size levels save each page as an optimised image — that's what makes scans and photos so much smaller. If you need selectable text, use the Light level.
Step-by-step guide: How to reduce PDF size for online forms (100 KB, 200 KB and more)
Read the guide