PDF & Files
Compress a PDF to Under 100 KB
Free to useNo sign-up requiredNo watermarkRuns in your browser
100 KB is a tight ceiling - some exam boards and older government portals still enforce it, well below what a typical scanned page needs. This tool aims directly at that number: enter 100 as the target, and the gentlest compression setting that gets under it is used automatically, tried in increasing steps rather than jumping straight to maximum compression.
At 100 KB, being honest about what is achievable matters more than at looser targets - a multi-page scan often cannot get there without real quality loss, and this tool says so plainly rather than quietly handing back something illegible.
How this tool works
Choose your PDF
Read straight from your device - there is no upload.
The 100 KB target is already set
Switch to a different number if your form asks for something else.
Compress
Settings are tried in increasing steps until the file is under 100 KB, or the smallest achievable size is reached.
Download
You are told plainly if 100 KB could not be reached, and given the smallest version this tool could produce instead.
How it works
The document's embedded photographs are re-encoded at progressively lower quality settings until the whole file is under 100 KB, stopping at the first setting that gets there.
Text, fonts and vector graphics are never touched - the reduction comes entirely from the images, which is what keeps a compressed document still selectable and searchable.
At 100 KB, many multi-page scans genuinely cannot get there without becoming hard to read. This tool tells you plainly when that happens and gives you the smallest usable file it could produce instead of forcing a number that destroys the document.
Where a 100 KB limit shows up
- Some older government exam and recruitment portals still set a flat 100 KB cap for supporting documents, separate from the more common 200 KB.
- Signature or ID-proof uploads on certain forms specify a very small ceiling like 100 KB alongside a separate, larger limit for the main document.
If 100 KB is not achievable
One page of scanned text or a photograph usually has more raw detail than 100 KB can comfortably hold at a legible quality. If this tool cannot reach 100 KB without the result becoming unreadable, it says so and returns the smallest usable version instead.
A lower-resolution scan to begin with, splitting a multi-page document, or checking whether the portal actually enforces 100 KB or a more generous limit are worth trying next.
Worked examples
A single-page signature scan
Often reaches 100 KB without much visible change, since a signature has little fine detail to lose.
A single-page scanned certificate
May need Strong-level compression and show a visible, but usually still legible, drop in sharpness.
A multi-page scanned document
Frequently cannot reach 100 KB without becoming hard to read - the tool will say so rather than force it.
Frequently asked questions
Is this free and does it upload my file?
Free, no sign-up, and your file never leaves your device - the whole job runs in your browser.
Are my files uploaded to a server?
No. Your files never leave your device. The file is opened and processed by your browser on your own machine, so nothing is transmitted to VSThiran and no copy of your document is ever stored on a server.
Why can't my PDF reach 100 KB?
100 KB is a genuinely tight limit for anything beyond a single simple page. A multi-page scan or a detailed photograph often cannot be compressed that far without becoming illegible, and this tool stops before that point rather than forcing an unreadable result.
Is 100 KB or 200 KB the more common limit?
200 KB is more commonly requested; 100 KB tends to appear on older portals or for smaller items like a signature or photo upload specifically, separate from the main document.
What should I do if I can't reach 100 KB?
Check whether the portal genuinely requires exactly 100 KB or accepts a more generous limit, try re-scanning at a lower resolution, or split a multi-page document so each part is smaller to begin with.