Compress PDF to 100 KB online, free
For upload forms that only take files under 100 KB. Choose your PDF and ScalePDF shrinks it until it fits.
How to use Compress PDF to 100 KB
- Choose the PDF your form rejected for being too large.
- The limit is already set to 100 KB. Change it if your form asks for a different size.
- Press Compress to 100 KB. ScalePDF re-saves the pictures first, and only turns pages into images if the file still does not fit.
- Download the smaller PDF and upload it to your form.
Compress PDF to 100 KB: common questions
Will my PDF still be readable at 100 KB?
Usually, yes. ScalePDF first lowers the quality of the pictures inside the PDF. If that is not enough, it turns pages into images at a lower resolution, step by step, and stops at the best quality that fits. A long scanned PDF may come out soft; split it or upload fewer pages if the form allows.
Is there a limit on how many PDFs I can compress?
No. There is no daily or monthly limit and no account, and it stays free for life: use it as often as you like. Files up to 50 MB in all are processed on ScalePDF’s server; bigger ones are processed right on your device, which can take a little longer.
Can I pick a different limit?
Yes. Change the number in the size box to any limit, for example 50 KB or 150 KB.
Is my file uploaded?
Only while it is being processed. Your file goes to ScalePDF’s server over an encrypted connection, is worked on in memory, and is deleted the moment the result comes back. Nothing is stored, logged or shared.