“File too large” is one of the most common errors when uploading documents to job portals, universities and government websites. Email providers also limit attachment sizes. This guide explains practical, free ways to reduce PDF file size, using our PDF Splitter and other tools.
Why PDFs get big
- Scanned pages are images, often at high resolution
- Phone photos converted to PDF can be several MB each
- Embedded fonts and graphics add weight
- Some files contain many unnecessary pages
Method 1: Remove pages you do not need
The quickest saving. Use the PDF splitter to keep only the required pages. A 30-page scan cut to 6 pages may become a fifth of the size.
Method 2: Compress images before making the PDF
If you create the PDF from photos, compress them first with the Image Compressor and then combine with JPG to PDF. For document pages, around 1200 to 1600 pixels on the long side is usually readable.
Method 3: Rescan at a lower resolution
Scanners often default to 300 or 600 DPI. For on-screen reading, 150 to 200 DPI is enough. Grayscale instead of colour can also cut size for text documents, if colour is not required.
Method 4: Split into parts
If a portal allows several uploads, split one large PDF into two or three smaller ones.
Method 5: Re-save from the original
If the PDF came from Word, re-export it with images compressed. Word’s “Save as PDF” has a minimum size option, and our Word to PDF tool produces compact files from simple documents.
Typical results
| Starting point | After |
|---|---|
| 12 MB phone-photo PDF (6 pages) | about 1 to 2 MB after compressing images |
| 25 MB scanned statement (40 pages) | about 3 MB after keeping 8 pages |
Results vary with content.
Check readability
After shrinking, zoom in to make sure numbers, stamps and signatures are clear. A tiny file is useless if the text cannot be read.
For page extraction steps, see how to split a PDF.
Frequently asked questions
How can I make a PDF smaller for email?
Remove unneeded pages, compress images and use a lower scan resolution.
What resolution should I scan documents at?
150 to 200 DPI is usually enough for screen reading.
Will reducing size make text blurry?
It can if pushed too far; always check readability.