Compress PDF to 100KB Free

How to compress a PDF to 100 KB

Some forms are strict: a government upload, a job application, a university portal, or a marketplace listing that accepts a PDF only under 100 KB. Most compressors offer vague "low, medium, high" settings and leave you guessing whether the result fits. This tool compresses toward a 100 KB target and tells you the final size before you download, so there is no guessing and no rejected upload. If 100 KB cannot be reached without ruining quality, it tells you honestly and gives you the smallest size it could reach.

Drop your PDF and choose the 100 KB target. The tool rebuilds the document and re-encodes the photos inside it at lower quality and smaller dimensions, trying again at lower settings until the file fits 100 KB. Text is never touched — only photos and scans are re-encoded — so a text-heavy document barely changes, while a photo-heavy one can drop by 90 percent. The whole job runs in your browser, so a confidential document never travels to a server.

Be honest with yourself about 100 KB: it is a very small target, and it has a cost. Photos will look soft, and small print in a scanned page will be harder to read. If the form allows a larger size, choose 200 KB or 500 KB instead — the result will look much better. And if the tool cannot reach 100 KB at all, it will say so and offer the smallest size it achieved, rather than failing silently. That happens with PDFs made of high-resolution scans: the images themselves take space even at low quality. In that case, split the document and compress the parts separately, or pick a larger target.

How to use this tool

1. 1Drop a PDF file onto the page.
2. 2Choose the 100 KB target.
3. 3Press Compress and download the 100 KB file.