How to compress PDF to 150KB
- 1Choose or drop your PDF into the box above.
- 2Leave the target at 150KB, 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 150KB: key facts
- Price
- Free — no sign-up, no watermark
- Privacy
- Runs in your browser; files are never uploaded
- Output
- PDF under 150KB, same page count
- What fits in 150KB
- Three to five scanned pages with comfortable 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 150KB?
A 150KB ceiling is common on state admission portals and some private-sector job sites that set a 150KB cap per document. 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, 150KB comfortably fits three to five scanned pages with comfortable 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 150KB. 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
150KB is a sweet spot for two-sided ID cards: merge front and back into one PDF, then compress — each side gets about 75KB, which is plenty.