Compress a PDF to 100KB
100KB is a severe limit, and it almost always comes from a government portal that won't budge. The target is already set — add your file and the tool works down toward it.
- Free
- No signup
- Runs in your browser
- Nothing uploaded
or browse your device
Compress a PDF to 100KB in three steps
- Add your scanned form or certificateusually one or two pages at this limit.
- Run itquality drops in stages until the file clears 100KB.
- Check it's still legibleat this size that matters more than at any other.
What you get
Built for portal caps
Exam registrations, visa applications and public-sector job forms are where 100KB limits live, and they reject at 101KB without explanation.
Aggressive by default
This page starts at maximum compression rather than working down politely from light, because 100KB rarely leaves room for politeness.
Legibility is the real test
Passing the upload isn't the goal if the clerk on the other end can't read your name.
Limits and formats
| Target | 100KB |
|---|---|
| Starting level | Maximum |
| Realistic for | One to three pages of black-and-white text |
| Struggles with | Color photographs, multi-page color scans |
Common questions
Is 100KB even possible for my document?
For a single page of printed black-and-white text, comfortably. For a color photograph or a ten-page scan, often not — there is a floor below which the page stops carrying information, and no tool can go under it.
My file won't get there. What now?
Attack the input rather than the compression. Convert to grayscale, which typically removes two-thirds of the data on a color scan. Then check whether every page is genuinely required — portals asking for 100KB usually want one document, not a bundle.
Why do these portals set such a low limit?
Many were specified years ago against storage and bandwidth budgets that no longer exist, and nobody has revisited the number. It isn't a judgment about your document.
Should I re-scan instead of compressing?
If you still have the original, yes. Scanning at 200 DPI grayscale often lands near 100KB with no compression at all, and looks far better than a 600 DPI color scan squeezed down to the same size.
Will my signature still be visible?
Usually, though it's the first thing to check. Thin pen strokes are exactly what aggressive compression softens. If the signature has gone mushy, grayscale first and compress less hard.
What people do around this step
Other size targets
Different forms cap at different sizes. Each target has its own page, set up for the limit it is named after.