PDFHomebaseCompress PDF to 100 KB for job applications, exam registrations and government forms that reject anything larger. Target size is already set to 100 KB, so you just add your file.
How to compress a PDF to 100 KB
- Click "Choose file" and select the PDF the portal rejected.
- Leave Target size at 100 KB, or lower it slightly for a safety margin.
- Click "Compress PDF" and read the message that says whether it fits.
- Click "Download" and upload the new file to the portal.
Getting a scan under 100 KB
100 KB is a tight limit. A single scanned page usually fits while staying readable. A scan with three or more pages often only fits once the tool turns the pages into images, which costs some sharpness and makes the text unsearchable. The result tells you if that happened.
You can help before you start. Scan at 150 DPI instead of 300, and use grayscale for black-and-white documents. If the portal only needs the first page, remove the rest with the Delete pages tool. If the limit applies to each file, split a long document and upload the parts separately.
Frequently asked questions
Why do application portals ask for files under 100 KB?
Exam boards, recruitment sites and government services handle huge numbers of uploads at once. A small cap keeps their storage and servers manageable, so they enforce it strictly.
What if my PDF can't get down to 100 KB?
The tool tells you it couldn't reach the target and offers the smallest version it managed, with its exact size. To go further, cut pages you don't need or rescan at a lower resolution, then try again.
Will my certificate still be readable at 100 KB?
For one or two pages, usually yes. The tool tries lossless clean-up and gentle image compression first. It only converts pages to images if nothing else works, so open the result and zoom in before you submit.
Can I do this on my phone before uploading?
Yes. It runs in Chrome, Safari and other mobile browsers, so you can shrink the file and upload it from the same phone. Your file isn't uploaded while it compresses.
The portal says 100 KB but still rejects my 99 KB file. Why?
Some sites count 1 KB as 1,000 bytes rather than 1,024, or apply the limit loosely. Type 90 in the size box instead of 100 to leave some headroom.
My file is already under 100 KB. What happens?
The tool tells you the PDF is already under the limit, so you can upload it as it is.