How to Reduce PDF Size to 100KB or 200KB for Online Forms

Many online forms, scholarship portals, bank websites and job applications accept PDF files only below a limit such as 100KB, 200KB or 500KB. A scanned document from a phone is often several MB, so the upload fails with a "file too large" message. The good news is that most documents can be reduced a lot without becoming unreadable.

Quick answer: Open the Compress PDF tool, upload your file, compress it, and check the new size. If it is still too big, remove pages you do not need with Remove PDF Pages, or rescan the document at a lower resolution.

Why Are PDF Files So Large?

A PDF made from typed text is usually small. A PDF made from photos or scans is large because every page is stored as a picture. The size depends mostly on three things: the number of pages, the resolution of each image and the amount of colour.

Scans and photos: a page saved as a high-resolution colour image can be 1MB or more.
Many pages: size grows with every page you add.
Embedded fonts and images: documents exported from design tools may carry extra data.

Step-by-Step: Reduce PDF Size

Step 1: Check the limit and note the current size

Read the upload rule on the form (for example 200KB) and check your file size in the file properties.

Step 2: Remove pages you do not need

If you uploaded a long file but the form needs only two pages, delete the rest. Fewer pages is the easiest way to reduce size.

Step 3: Compress the PDF

Use the Compress PDF tool. It reduces the quality of the images inside the PDF. Your file is processed in your browser.

Step 4: Check readability

Open the new file and zoom in. Text, numbers and stamps must still be clear. Portals can reject a document that cannot be read.

Step 5: Retry with a different method if needed

If it is still above the limit, scan again in black and white or grayscale at a lower resolution and then compress.

Reduce your PDF now

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Compress PDF

What Size Can You Expect?

Results depend on the file, so these are only general ideas.

File type	How it compresses	Tip
Scanned color pages	Usually shrinks a lot	Rescan in grayscale if still large
Typed text document	Already small, little change	Remove extra pages or images
Photos in PDF	Shrinks well	Resize photos first
Image-to-PDF files	Depends on the image size	Resize or compress the images before making the PDF

Tip: If your PDF came from photos, compress or resize the photos first and then create the PDF with Image to PDF. This often gives a smaller file than compressing afterwards.

Common Mistakes

Compressing too much, so the text becomes blurry and the form is rejected.
Using a file that is the right size but the wrong format or name length for the portal.
Not reading the exact rules (size, pages, format) in the official notice.
Compressing the same file again and again, which lowers quality each time.

Frequently Asked Questions

Remove unneeded pages, compress the PDF, and check that it is still readable. If it is above the limit, rescan at a lower resolution or in grayscale and compress again.

PDFs made from scans or photos store every page as an image, which makes them large. Typed documents are usually small.

Yes, compression lowers image quality to save space. Check that text is still clear after compressing.

Antokia processes the file in your browser, so it is not uploaded to a server.