How to compress PDF to 300KB
- 1Choose or drop your PDF into the box above.
- 2Leave the target at 300KB, 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 300KB: key facts
- Price
- Free — no sign-up, no watermark
- Privacy
- Runs in your browser; files are never uploaded
- Output
- PDF under 300KB, same page count
- What fits in 300KB
- Several pages of a scanned certificate with comfortable, 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 300KB?
A 300KB ceiling is common on NTA exams (JEE Main, NEET UG, CUET UG, UGC NET) for category and PwD certificates, and UPSC for the photo ID PDF. 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, 300KB comfortably fits several pages of a scanned certificate with comfortable, 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 300KB. 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
NTA portals usually want 50KB–300KB. Aim for 250–290KB rather than scraping the ceiling, and you'll have room to spare if the portal rounds sizes differently.