Split PDF by File Size
Choose By file size, enter the maximum size per part in KB, and pages are added to each part in order until the next one would go over the limit. To split a large PDF by MB, just multiply by 1024: 2 MB is 2048 KB and 10 MB is 10240 KB. Pages are never cut, so every part opens as a normal PDF.
Runs in your browser
How to split a PDF into parts under a size limit
- 1Select the large PDF.
- 2Choose the By file size mode.
- 3Enter the maximum size per file in KB (1024 KB is filled in to start).
- 4Press Split PDF and download the parts, named with the page ranges they contain.
Good to know
- Some email services count attachments after encoding, which adds about a third. If a 10 MB part still bounces, try parts of about 7000 KB.
- A single page that's bigger than the limit gets a file to itself and can still be over it. Compress the PDF first to fix that.
- Compressing first and splitting second usually means fewer parts to send.
Frequently asked questions
Does splitting by size reduce quality?
No. Pages are copied as they are; the tool only decides which pages go into which file. To make pages lighter, use Compress PDF.
Why is one part bigger than the size I set?
That part holds a single page that's already larger than your limit, such as a high-resolution scan. Pages can't be cut, so compress the PDF and split it again.
Are my files uploaded?
No. Splitting runs in your browser. You can use it free 3 times a day without signing up.