Application forms, exam portals and government sites often reject anything over 100 KB.
PDF Toolkit
Compress PDF to 100 KB
Get a PDF under 100 KB for upload forms with a strict size limit. Image quality is lowered only as far as needed, and if a file can't get there and stay readable, you see the smallest size it reached.
It aims just under 100,000 bytes, so the file passes however a form counts kilobytes.
Free, no signup, no upload — PDFs are processed on your device.
Compress to a size
Why it helps
Why use this for a 100 KB limit
Several quality settings are tried and the best one that fits is kept, instead of crushing every file to the lowest setting.
Certificates and ID scans are compressed on your device, never on a server.
How to use it
How to compress a PDF to 100 KB
1 Drop the PDF into the tool. Under 100 KB is already selected.
2 Press Compress: image quality steps down until the file fits.
3 Check a page with the before-and-after slider, then download.
Quick tips
Tips for a 100 KB limit
One or two scanned pages fit under 100 KB most easily. For longer documents, split out only the pages the form asks for.
Scanning in grayscale instead of color gives a smaller file to start with.
The file is aimed under 100,000 bytes, so it passes whether a site counts a kilobyte as 1,000 or 1,024 bytes.
FAQ
Compress PDF to 100 KB questions
Can every PDF get under 100 KB?
No. A long document full of photos may not fit without becoming unreadable. Then the tool stops at the smallest readable version, shows its size, and suggests splitting out fewer pages.
Will the text still be readable?
Real text stays sharp, because only images are recompressed. Scanned pages are images, so their quality drops with the size, but the tool stops before they become unreadable.
Is my file uploaded?
No. Everything runs in your browser, and the PDF never leaves your device.
The form says 100 KB. Will a 99 KB file be accepted?
The tool aims under 100,000 bytes, which is under the limit however the form counts a kilobyte, so it is accepted either way.
Open the main PDF Toolkit page
This page focuses on one search intent. The main tool page includes the broader product overview, related workflows, and full use cases.