How to compress a PDF to 100KB
Application portals and government forms often cap uploads at 100KB. Here is the fastest reliable way to get there without paying for desktop software.
Every step runs on your device — no upload, no account
Compress a PDF nowStep by step
1. Open the compressor
Open the PDFFILZ compress tool and drop your PDF in. The file is read locally, so nothing is sent to a server.
2. Start at medium quality
Medium re-encodes page images at a lower resolution and usually cuts a scanned document by 60–80% while staying readable.
3. Check the resulting size
If you are still above 100KB, drop to the lowest quality setting and run it again on the original file rather than the output.
4. Split if it still will not fit
A long scan may never reach 100KB. Use the split tool to send the relevant pages only — a 3-page extract compresses far below a 40-page original.
Frequently asked questions
Why can't my PDF get below 100KB?
Text-only PDFs are already small; the weight almost always comes from scanned page images. If every page is a photo, page count sets a floor — remove or split pages to go lower.
Does compressing a PDF lose quality?
Image quality drops because page images are re-encoded at a lower resolution. Text stays legible at medium quality; only go lower when a hard size limit forces it.
Is it safe to compress a confidential PDF online?
On PDFFILZ the compression runs inside your browser, so the document never leaves your device and is never stored on a server.
Do I need an account?
No. You get free runs every day with no sign-up, and a small credit pack or a Pro plan only if you need heavy daily use.