How to Reduce PDF File Size for Email and Uploads

“File too large” is one of the most common messages people see when they try to email a PDF or upload it to a portal. Most email services limit attachments to around 20–25 MB, and many websites accept only a few megabytes. The good news is that most oversized PDFs can be made much smaller.

Why are some PDFs so large?

A PDF that contains only typed text is usually tiny. Size grows when a document contains images: phone scans, photos, high-resolution graphics or scanned pages. A ten-page scan can easily reach 20 MB because every page is stored as a large picture.

How to compress a PDF

Open Compress PDF.
Select your file.
Choose light, balanced or strong compression.
Download the smaller file and check how much space you saved.

Try it now: Compress PDF is free, works in your browser and needs no signup.

Which compression level should you choose?

Light: best when quality matters most, for example documents you will print.
Balanced: a good default for email and most uploads.
Strong: the smallest file, ideal for strict upload limits. Check that small text is still readable.

What works best

Compression is most effective on scanned documents and image-heavy files. A PDF that is already small and text-only will not shrink much, because there is little to remove.

Other ways to make a PDF smaller

Remove unnecessary pages with Remove PDF Pages.
Convert to grayscale with Grayscale PDF if colour is not needed.
Split the document into parts with Split PDF and send them separately.
Compress images before you build the PDF using Compress Image.

Is it private?

Yes. Compression runs in your browser, so your documents are not uploaded to a server.

FAQ

Will compression make text blurry?

At strong settings, very small text can lose sharpness. Try balanced first and zoom in to check before sending.

Can I compress several times?

You can, but each pass lowers image quality further. It is better to choose a stronger level once.