To compress a PDF to 100KB: select the file below, press Compress PDF and download the result. If your scan has several pages, tick black & white for sharper text at this size.
How to compress PDF to 100KB
- Select your PDF, or several PDFs.
- Leave the limit at 100 KB.
- For certificates and forms, tick black & white. Text stays sharper at this size.
- Press Compress PDF, zoom into the preview and download.
Where you meet a 100KB limit
100KB is one of the most common upload limits on Indian application portals. Recruitment and exam forms, state PSC portals, some university and scholarship forms and many government service portals ask for each certificate or ID proof as a PDF under 100KB.
The limit applies to each file, so a one-page certificate is usually easy. The trouble starts with phone photos turned into PDFs and with scans that run to several pages.
If your PDF won't go below 100KB
- Upload only the pages the portal asks for. You can remove the rest with Delete PDF Pages.
- Tick black & white. Grey-scale pages need far less data.
- Phone photos often include the table and background, so crop them first with Crop PDF.
- If you are scanning yourself, 150 to 200 dpi in grey-scale is enough for documents.
Check it is readable
After compressing, the tool shows a page as an image. Zoom in on the smallest text, such as your roll number, dates and seals. If they are hard to read, try black & white or remove pages and compress again. A portal may accept the upload and still reject an unreadable document at verification.
On Android or iPhone
Open this page in Chrome or Safari, tap Select files, choose the PDF from Files or Downloads, press Compress PDF and tap Download. The new file goes to your Downloads folder, ready to upload.
Why your file stays private
Compress PDF to 100KB runs entirely inside your browser. Your file is read from your device, processed in memory and saved back to your device. It is never uploaded to GreenPDFs or anyone else, so you can use it with Aadhaar, marksheets, bank statements and other personal documents. How in-browser processing works.
Frequently asked questions
Can every PDF be compressed to 100KB?
Most can. Typed PDFs and light scans get there easily. A long scan full of photos sometimes can't, and in that case the tool shows the smallest size it reached and suggests what to try next, such as removing pages, cropping margins or splitting the file.
Will the text still be readable?
The tool first tries a lossless optimisation, which keeps text sharp and selectable. If that isn't enough, it saves the pages as images at the highest resolution that still fits 100KB, then shows you a preview to check before you upload.
Does it work on a mobile phone?
Yes. Open this page in Chrome or Safari on Android or iPhone, pick the PDF from Files or Downloads, and download the result. There is nothing to install.
Is my document uploaded anywhere?
No. GreenPDFs works inside your browser, so the PDF stays on your phone or computer. You can use it for Aadhaar, marksheets and other personal documents.
My portal says the file is 101KB. Why?
Some portals count 1 KB as 1,000 bytes and others as 1,024. GreenPDFs stays a little below the limit so either way of counting works.