How to Compress a PDF to 100 KB or 200 KB (Free, No Upload)
Why forms ask for a PDF under 100 KB
Government portals, exam and admission forms, scholarship sites and job applications often limit uploads to 50 KB, 100 KB, 200 KB or 1 MB. A single page scanned with a phone camera is usually 1–5 MB, so the form rejects it. Compressing the PDF to the exact limit fixes that in a few seconds.
How to compress a PDF to 100 KB
- Open Compress PDF.
- Add your PDF from your phone or computer.
- Tap 100 KB, or type the exact limit the form gives (for example 50 or 150) and choose KB.
- For scanned documents, turn on Black & white. It makes the file much smaller.
- Click Compress PDF and download the result. The bars show the original, target and final size.
The tool never gives you a file bigger than the one you started with, and you can try again with a different size straight away.
Why your PDF is so big
- Scans are photos. Every scanned page is a large image, even if it only contains text.
- High camera resolution. Modern phones take 12–50 megapixel photos, far more than a form needs.
- Colour. A colour scan of a black-and-white document stores three times the information.
- Extra pages. Blank backs and instruction pages add size without adding value.
Tips for very small sizes like 50 KB
- Remove pages you do not need first with Split PDF (use Pick pages).
- Turn on Black & white for certificates, marksheets and ID proofs.
- If the portal allows several files, upload one page per file instead of one long PDF.
- When you scan, use the document mode of your scanner app and crop to the edges of the paper.
What happens to the quality
The tool first tries lossless compression, which keeps everything exactly as it is. If that is not enough to reach your size, the pages are turned into images at the highest quality that still fits. The page looks the same, but text can no longer be selected or searched. Always open the result and check that names, numbers and photos are clear before you upload it.
Because everything runs in your browser, documents like Aadhaar, PAN cards and marksheets never leave your device.
Frequently asked questions
Can I compress a PDF to 50 KB?
Yes. Type 50 and choose KB. One-page documents usually fit; long or colour documents may need Black & white or fewer pages.
Will my document become blurry?
Only if it has to be turned into images to reach a very small size. Check the result, and choose a slightly larger size if text looks soft.
Can I compress a PDF on my phone?
Yes. It works in Chrome or Safari on Android and iPhone — no app needed.
Is it free?
Yes. There is no limit, no sign-in and no watermark.