How to compress PDF to 100KB
- 1Choose or drop your PDF into the box above.
- 2Leave the target at 100KB, or adjust it if your form has a different limit.
- 3Turn on Black & white for scanned documents — it saves a lot of space.
- 4Press Compress, check the result size, and download.
Compress PDF to 100KB: key facts
- Price
- Free — no sign-up, no watermark
- Privacy
- Runs in your browser; files are never uploaded
- Output
- PDF under 100KB, same page count
- What fits in 100KB
- Two to four pages of a scanned document at readable quality
- Method
- Pages re-rendered as JPEG; DPI and quality tuned to hit the limit
- Works on
- Any modern browser — Android, iPhone, Windows, Mac
- Offline option
- FramePDF Android app (free)
Who asks for PDFs under 100KB?
A 100KB ceiling is common on job applications, university admission forms, and scholarship portals that cap each document at 100KB. These limits exist because the portals were built to handle thousands of uploads at once, not because your document needs to be that small.
In practice, 100KB comfortably fits two to four pages of a scanned document at readable quality.
How this tool hits the exact size
Instead of guessing a "low / medium / high" setting, the tool searches for the best combination of resolution and image quality that lands just under 100KB. It starts at 150 DPI and steps down only as far as it has to — never below the point where text becomes unreadable.
Pages are re-saved as images, which is what most portals expect from a scanned certificate. If you need selectable text, keep your original as well.
Tip
If you have a multi-page file and only need one page, remove the extra pages first — every page you drop gives the rest more of the 100KB budget.