Compress PDF to 100 KB
Get your PDF under 100 KB — automatically.
🔒 Everything above runs on your device — your file is never uploaded anywhere.
Compress PDF to 100 KB shrinks your document until it is under 100 kilobytes, the tightest limit most upload forms set. It happens in your browser, so the file is never uploaded.
100 KB is a very small limit, roughly the size of one low-resolution photo. Application forms, scholarship portals and some government or exam websites ask for documents this small. A one-or-two-page scan can usually be brought down to this size; a long document generally cannot without becoming unreadable. If yours is long, upload only the pages the form needs by using the Extract Pages tool first.
The tool rebuilds each page as a compressed image and steps the quality and resolution down until the whole file fits under the limit, then stops at the first result that fits, so you keep as much quality as possible. Because pages become images, the text in the compressed file cannot be selected. Keep your original for that.
How it works
- 1Upload your PDF.
- 2Click Compress to 100 KB. The tool tries progressively stronger compression until it fits.
- 3Download the smaller PDF.
Frequently asked questions
How do I compress a PDF to under 100 KB?+
Upload it here and press Compress to 100 KB. The tool lowers image quality and resolution step by step until the file is under 100 KB, then gives you the result.
Why is 100 KB so hard to reach?+
A single scanned page is often 300 KB to 2 MB. Getting it under 100 KB needs strong compression, so this works best on one to three pages.
Is my PDF uploaded?+
No. Compression runs in your browser and the file never leaves your device.
What if it cannot reach the limit?+
Very long or dense documents may not fit. You will be told, and given the smallest readable version. Splitting the PDF into two parts first usually solves it.