Compress PDF to 100 KB
Make a PDF smaller than 100 KB for an upload form. 100 KB is one of the tightest PDF limits on upload forms, often for a single certificate or ID page.
- Under 100 KB
- Nothing uploaded
Your files stay on this device. Nothing is uploaded.
0 bytes of your files sentFreeUnlimitedNo login or sign-up
How to compress a PDF to 100 KB
- 01
Choose the PDF
Pick it from your phone or computer; its current size shows next to the name.
- 02
Keep 100 KB selected
The limit is already set for this page. Change it if your form allows more.
- 03
Compress and check
Each page is redrawn until the whole file fits. Open the download and check every page.
What fits in 100 KB
- One or two pages of printed text fit in 100 KB and stay readable. A colour photo page needs most of the limit by itself.
- Pages are saved as images to reach the limit, so text in the new PDF can't be selected. Keep the original.
- A digital signature is lost when a PDF is rewritten. Ask the issuer for a smaller signed copy instead.
Questions people ask
Is my file uploaded?
No. The PDF is made in your browser on your own device and never sent anywhere.
Will the text still be readable?
Yes, if the limit suits the number of pages. Pages are drawn at up to 150 dpi and only lowered as far as the limit needs. Open the download and check every page before you upload it.
How do I compress a PDF to 100 KB on my phone?
Open this page in your phone's browser, choose the PDF and tap Compress to under 100 KB. It works without an app or sign-up, and the smaller file downloads to your phone.
My PDF won't go under 100 KB. What can I do?
Remove pages the form doesn't need, or scan again in black and white: grey, shadowed scans are the hardest to shrink. The tool tells you when a page can't fit while staying readable.
Is 100 KB counted as 100000 or 102400 bytes?
Forms rarely say. The tool stays under 100000 bytes, which passes either way.
Can I compress a PDF to 100 KB without losing quality?
Not completely. To get most PDFs under 100 KB, each page is saved as a compressed image, so fine detail softens. Printed text on white usually stays clear enough to read.
Why is my one-page PDF bigger than 100 KB?
Scans from a phone or scanner store the page as a large photo, often over 1 MB. Compressing redraws it at 150 dpi as a smaller JPG, which is often enough to bring one page under 100 KB.
Can I compress a PDF to 50 KB or less?
No. 100 KB is the smallest limit here, because below it a full page of text is usually hard to read. Removing pages the form doesn't need is the best way to save space.