Compress PDF to 100 KB

To compress a PDF to 100 KB, choose your file and tap Compress to under 100 KB. Image resolution drops in steps until the PDF fits; typed text stays sharp. In our tests, a 5.16 MB six-page scan reached 69 KB in 2.1 seconds.

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Up to 200 MB. Processed on your device.

Key facts

Compress PDF to 100 KB is a Documently preset that brings a PDF under 100 KB, a frequent limit for supporting documents such as an Aadhaar or PAN copy, a caste certificate or an experience letter. In our tests, we measured a 6-page scanned PDF of 5.16 MB reaching 69 KB in 2.1 seconds. The compressor is Ghostscript compiled to WebAssembly, so the file is processed inside the browser and never uploaded. Scanned images are redrawn at 150 DPI first and lowered towards 40 DPI only if the file is still too big; typed text is never touched. A PDF already under 100 KB comes back untouched. Under 100,000 bytes is the safe target, because 100 KB can mean 100,000 or 102,400 bytes depending on the portal. A password-protected e-Aadhaar file needs an unlocked copy first. Pick the PDF, tap Compress to under 100 KB, and zoom in on the result before uploading.

Some application forms cap each supporting document at 100 KB: an Aadhaar or PAN copy, a caste or domicile certificate, a degree certificate or an experience letter. It is roomy for one or two pages and tight for more. This page is preset to 100 KB, works on your phone, and never uploads your documents anywhere.

Which documents usually need to be under 100 KB?

ID proofs and single certificates are the typical case. A two-sided Aadhaar card on one page, a PAN card, a caste certificate or an NOC is usually one or two pages, which sits comfortably under 100 KB once compressed.

Each form sets its own limit, so read the instructions next to the upload button. If it says 100 KB, aim a little lower so that whichever way the portal counts kilobytes, you pass.

Why is my scanned PDF so large in the first place?

Scanner apps and phone cameras save each page as a large photo — often 2,000 to 3,000 pixels wide. That is far more detail than a screen or a form reviewer needs. A one-page scan can easily be 1–3 MB before compression.

The compressor fixes this by redrawing those images at a lower resolution. It starts at 150 DPI, which is still sharp on screen, and steps down towards 40 DPI only if the file is still above 100 KB. Text typed into the PDF is not touched, so a digitally issued certificate stays crisp.

Getting a clean result at 100 KB

For two-page ID proofs, put both sides on one page (scan them together) rather than as two separate pages.
Use Black & white for printed certificates; keep colour only for documents where a coloured seal or photo matters.
Photograph on a flat, well-lit surface. Shadows and creases add noise that is expensive to store.
If you have the document as photos rather than a PDF, convert with JPG to PDF first, then compress here.
Open the downloaded file and zoom in on the smallest print — roll numbers and dates — before you upload.

What if it says it couldn't reach 100 KB?

That happens with long, photo-heavy PDFs. The tool tells you honestly instead of shipping an unreadable file. Your options: switch on Black & white, remove pages with Split PDF, or check whether the form accepts a larger file on a different field. In our tests a 6-page scan reached 69 KB, but with images at about 55 DPI, so zoom in to check small print; the more pages, the bigger the trade-off.

Frequently asked questions

PDF ko 100 KB kaise kare on mobile?

Open this page in Chrome or Safari, tap Choose PDF, and pick the file. Under 100 KB is already selected, so tap Compress to under 100 KB and download the result. No app or signup is needed, and the PDF never leaves your phone.

Can I compress my Aadhaar PDF to 100 KB?

Yes. A one-page Aadhaar print or scan usually compresses well under 100 KB. If it's the password-protected e-Aadhaar PDF, open it and save or print it as a new PDF first, because a locked file can't be compressed. Never share the password with any website.

Is 100 KB the same as 0.1 MB?

Roughly. Using 1,000-byte kilobytes, 100 KB is exactly 0.1 MB. Using 1,024-byte kilobytes it is about 0.098 MB. The safest target is a file under 100,000 bytes, which satisfies both ways of counting.

Will compressing change the content of my PDF?

No. Pages, text, order and layout stay the same. Only the resolution of embedded images is lowered, which is what makes the file smaller. Links and typed text remain as they were.

What if my PDF is already below 100 KB?

The tool notices and gives you the original file back unchanged. There is no point degrading a document that already meets the limit, and you avoid any loss in quality.