Compress a PDF to 100KB

A hundred kilobytes is the tightest limit forms ask for, and it is small enough that something has to give. Drop the file in and it comes out under the line — with an honest note about what it cost.

Files never leave your browser

Drop a PDF here or click to choose — already set to 100 KB

Whether 100KB is realistic depends on one thing

Not on the page count, and not on how good the compressor is. It depends on where the PDF came from, and the two cases behave nothing alike.

A PDF that was scanned or photographed — a certificate, a transcript, an ID card — is already a picture inside a PDF wrapper. Shrinking it is ordinary image compression, and one scanned page will usually reach 100 KB while staying readable.

A PDF that was exported from Word or Google Docs is the opposite. Its text is stored as instructions, not pixels, and it is already tiny by nature — often under 100 KB before you touch it. If such a file is somehow large, the cause is almost always one embedded photograph, not the text.

So before compressing, look at your file. If it is a scan, read on. If it came from a word processor and is already small, you do not need this page at all.

What has to be given up at this size

This is the part most tools do not say. To reach 100 KB, every page is redrawn as an image and that image is compressed hard. Two consequences follow, and you should know both before you press the button.

The text becomes a picture. It stops being selectable, copyable and searchable. For a scan that loses nothing — the text was already a picture. For a PDF born in Word, that is a real downgrade, and you would be better off exporting a smaller version from the original document.

Small print is the first thing to go. At 100 KB across several pages there is very little budget per page. Body text usually survives; footnotes, stamps and handwriting at the bottom of a form often do not. The tool tells you the resolution it ended up at, so you can judge rather than guess.

If the result is too soft to read, the honest fix is fewer pages per file, not a better setting.

One page fits easily. Ten pages do not.

The budget is shared. A single scanned page at 100 KB has roughly 100 KB to itself and comes out clean. Ten pages have about 10 KB each, which is below what a legible A4 scan needs.

If your document is long and the limit is fixed, the usual way through is to split it — many portals that cap each upload at 100 KB accept several uploads. Failing that, ask whether every page is required; a ten-page transcript where only two pages are being checked is a common cause of an impossible target.

The tool never silently pretends. If 100 KB could not be reached, it says so on screen with the size it actually achieved, while you still have time to do something about it.

Nothing is uploaded, and you can prove it

The file is read from your disk, rebuilt in your device's memory, and handed straight back as a download. There is no server here doing the work, which is also why there is no daily limit, no account and no watermark.

That is not only a promise. This page is served with a Content Security Policy containing connect-src 'self', which instructs your browser to refuse any connection to another address. Open your browser's network tab and watch nothing leave — or load the page once, disconnect from the internet, and compress anyway. It still works.

Other PDF size limits

Set any other limit, quality or resolution on the main Compress PDF page, or read how upload size limits actually work.