How to compress a PDF to 100KB
- 1 Scan or photograph the document, then convert it with JPG to PDF if it is not a PDF yet.
- 2 Drop the PDF here. The target is already set to 100 KB.
- 3 Tick Black and white for certificates and letters; it leaves room for sharper text.
- 4 Press Compress to 100 KB, check the zoomed preview, then upload the downloaded file.
Getting a scan under 100KB with readable text
Most failed uploads at 100KB come from the scan, not the compression. A phone photo of a certificate is often 3 to 5 MB, and most of that is background, shadow and colour noise.
- Fill the frame: crop to the page edges with Crop Image before converting.
- Greyscale: a black and white scan needs about a third of the bytes of a colour one.
- One page per file when the portal allows it: each page then gets the whole 100KB.
If you need a photo too, Passport Size Photo Maker sizes it correctly. Bigger limit? Use Compress PDF to 200KB.
Features
Built for single documents
Tuned for one to three scanned pages, the most common upload.
Sharpest result under 100KB
Keeps as many pixels as possible and lowers quality only as far as needed.
Quality check
A zoomed before and after view shows whether the text is readable.
Black and white mode
Greyscale certificates fit 100KB with noticeably clearer text.
When to use it
Government job applications
Upload CNIC, domicile and degree copies to recruitment portals. Photos of documents can be combined first with JPG to PDF.
Exam registrations
Board, university entry and competitive exam forms. For your passport photo, use the Passport Size Photo Maker and Compress Image to 100KB.
Identity documents
Passport, ID card and driving licence copies. Join a CNIC front and back into one file with Merge PDF before compressing.
Experience and character certificates
Single-page letters on letterhead. Remove blank pages with Delete PDF Pages to save space.
Related PDF tasks
Frequently asked questions
Is my document uploaded anywhere?
No. The PDF is compressed by your own browser and never leaves your device, which matters for ID cards, certificates and bank documents.
How many pages fit in 100KB?
In black and white, two or three scanned pages usually fit with readable text. In colour, plan for one or two. Typed documents exported from Word can fit far more.
My scan is a photo. What should I do?
Convert it with JPG to PDF first. Crop the edges with Crop Image so the page fills the frame; less background means more detail for the text.
Should I scan in colour or black and white?
Black and white or greyscale is best for certificates, letters and forms. Use colour only when the portal asks for it, for example for a coloured stamp or photo.
The result is blurry. How can I improve it?
Rescan straight on in good light, crop away the background, and tick Black and white. If the document has several pages, upload the important page alone.
The portal says the file is still too big.
Some portals count 100KB as 100,000 bytes rather than 102,400. Set the target to 95 KB to be safe.
Can I compress a passport photo here?
Photos are images, not PDFs. Use our Compress Image to 100KB tool for JPG photos.
Is the text still selectable?
Usually yes, because only the images inside the PDF are made smaller. If whole pages must be saved as pictures to fit, the tool tells you.
How this tool works. These PDF tools run entirely in your browser using two widely used open-source libraries: PDF.js, the PDF engine built into Firefox, to read and render pages, and pdf-lib to create and edit files. Each tool is tested with typed documents, phone scans and photo-heavy files before it goes live, and nothing you open is sent to a server.
Built and reviewed by Hamza Farooq, founder and lead developer
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