Get a PDF under 100 KB for forms with a strict size limit. The tool tries the gentlest settings first, keeping your text sharp and selectable if it can, and shows the exact size in bytes before you download. Everything happens in your browser, so the document is never uploaded.
How to use Compress PDF to 100KB
Choose a PDF. The Target size is already set to 100 KB; pick Custom if your form gives a different limit.
Click Compress to 100 KB and wait while it tries settings, from gentlest to strongest.
Read the result: the exact size in bytes, whether it fit, and whether the text is still selectable.
Click Download PDF. If it couldn't fit, cut the PDF down to the pages the form needs and try again.
Frequently asked questions
How do I reduce a PDF to under 100 KB?
Choose it here and click Compress to 100 KB. The tool re-saves the photos first, then turns pages into images only if it must, and stops at the best quality that fits.
What does 100 KB mean here?
1 KB is counted as 1,000 bytes, so the target is at most 100,000 bytes. That is the stricter count, so the file also passes portals that count 1 KB as 1,024 bytes. The result shows its exact size in bytes, so you can compare it with your form's limit.
Will my PDF still be readable at 100 KB?
A one- or two-page document usually is. 100 KB is a tight budget, though: spread over five scanned pages it leaves 20,000 bytes a page, so pages may become low-dpi images where small print gets soft. Send only the pages the form asks for to keep each one sharp.
Why did my text stop being selectable?
To fit 100 KB the tool had to turn the pages into images, which happens when the text and fonts alone are bigger than the target. The result says when this happened. A form that only needs to see the document doesn't mind.
What if it says it couldn't get under 100 KB?
You get the smallest file it could make, with its exact size. Keep only the pages you need with Extract Pages, trim scan margins with Crop PDF, or check whether the form accepts a bigger file, then compress again.
My form wants a JPG, not a PDF. What do I use?
Use compress image to 100 KB, or 50 KB for photo and signature fields. To go the other way and put photos into one PDF, use JPG to PDF and then compress it here.
Is my document uploaded?
No. It's compressed in your browser, so certificates, ID scans and other private documents never leave your device.
When 100 KB is the limit
Indian exam, scholarship and job application forms often ask for each supporting document, such as a certificate or an ID proof, as a small PDF. The exact limit varies by portal and changes between years, so take it from the form's own notice, not from a guide like this one.
If the form gives a minimum as well as a maximum, check the byte count in the result; a much smaller file than needed can be rejected too. Pick Custom and enter a size nearer the maximum for more detail.
How the 100 KB target is reached
First the file is restructured losslessly; if that already fits, nothing visible changes. Next, photos inside the PDF are re-saved as JPEG, starting at 150 dpi and 72% quality and stepping down to 60 dpi and 40%. Text, fonts and vector drawings aren't touched, so the text stays selectable and searchable. Only if that still isn't enough is every page turned into a picture, from 150 dpi down to 50 dpi. At each stage the tool searches for the highest setting that fits instead of jumping to the smallest.
What happens to the text
When the text and fonts on their own are bigger than the target, the only way to fit is to turn each page into an image. The page still looks the same at normal zoom, but its text can't be selected, searched or copied, links and form fields stop working, and fine print gets softer as the dpi drops. The result tells you which of the two happened. If you need the text back, run OCR PDF on the result, but note that adding a text layer makes the file bigger again.