Compress PDF to 100 KB
100 KB is a very small size for a PDF, and you usually only need it because an old upload form refuses anything larger. Whether you can hit it depends entirely on what's inside: image-rich files have lots of slack to squeeze, while text-only files barely have any to give. Here's how to do it, what you trade away, and what to do when a file simply won't go that low.
The short answer
Yes, though 100 KB is an aggressive target. compress cat runs entirely in your browser — your file is never uploaded, it's free, and there's no signup. Set 100 KB and it makes a best-effort pass to get as close as possible (it can't guarantee every file lands exactly there). Image-heavy and scanned PDFs shrink most easily; a text-based PDF forced down to 100 KB may have to be rasterized into images, which makes the text no longer selectable or searchable and can look slightly soft.
Compress your PDF to 100 KB now
Common cases: exam sign-up ≤200KB, visa documents ≤1MB, government portals ≤500KB
This tool usesrasterizationto compress, which is best forscanned / photo-based PDFs. A text-only PDF becomes an image after compression, so youcan no longer copy or search the text — if you need selectable text, don't use this tool on a pure-text document.
100 KB shows up in older government, exam-registration, and form upload boxes that cap each file very tightly and accept nothing bigger.
How do I compress a PDF to 100 KB?
Drop your file into compress cat, set the target size to 100 KB, and the tool downsamples images and re-encodes the file locally to get as close to 100 KB as it can. Everything happens in your browser, so the file never leaves your device.
If it can't quite reach 100 KB on the first pass, it shows you the smallest size it managed — so you can decide whether to accept it, drop a few pages, or relax your quality expectations and try again.
- Drop in PDF → set 100 KB target → download
- In-browser, no upload, free, no signup
- Scanned / image-based PDFs hit the target most easily
Will compressing to 100 KB reduce quality?
It can, especially for text PDFs. At 100 KB the tool usually has to downsample images hard, and if the document is mostly text, the only way down may be to flatten each page into a single compressed image — at which point the text becomes unselectable, unsearchable, and can look fuzzy when zoomed in.
A scanned document is already an image, so it'll lose sharpness but usually stays readable. If selectable, crisp text matters to you, 100 KB may be too aggressive — a looser target like 200 KB is worth considering.
Why won't my PDF go below 100 KB?
Because there's only so much room to compress. A multi-page scan, or a file packed with high-resolution photos or charts, is hard to cram under 100 KB, and the tool can only return its best-effort minimum.
Common fixes: remove pages, accept lower image quality, or step up to a 200 KB target. A plain text contract is often already somewhere between a few dozen and a couple hundred KB, so it rarely needs forcing this small.
Frequently asked questions
Is 100 KB guaranteed?
No. It's a best-effort target — the tool gets as close to 100 KB as it can, but whether it lands exactly there depends on your file's contents. If it can't reach it, it returns the smallest size it achieved.
Can I still search the text after compressing to 100 KB?
If the tool had to rasterize pages into images to hit the target, the text is no longer selectable or searchable. Text-based PDFs are especially prone to this at an aggressive 100 KB target.
Is my file uploaded to a server?
No. The whole compression runs locally in your browser — nothing is uploaded, it's free, and no account is needed.
Updated · compress cat team