Some portals — admission forms, recruitment sites and state government services — allow only 50 KB per document. That's tight, so this page is tuned for it: add your PDF, click Compress PDF and the tool searches for the clearest version that still fits under 50 KB.
Tips for the best result
- 50 KB works best for one page. Remove extra pages first with Remove pages.
- Tick Convert to black & white for printed certificates and mark sheets — it keeps text readable at very small sizes.
- Starting from a phone photo? Use JPG to PDF under 50 KB instead — it's one step instead of two.
How to compress PDF to 50 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 50 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 do I reduce a PDF to 50 KB?
Add the PDF here — the 50 KB limit is pre-set — and click Compress PDF. The download shows the final size so you can confirm it's below 50 KB before uploading.
Can a multi-page PDF fit under 50 KB?
Two or three pages of plain text usually can, especially in black & white. Scanned colour pages with photos often can't look good at 50 KB, so upload them separately if the form allows.
Will the certificate still be readable?
For a single page, yes. The tool keeps the highest quality that fits, and black & white mode makes small text noticeably clearer.
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