Email and upload forms often refuse files over 10 MB or 25 MB. Instead of choosing pages by hand, tell the tool the biggest size you can send and it makes the parts for you.
Try it now: Split PDF by Size
Free, no sign up, and the file stays on your device.
Open Split PDF by SizeHow to split by size
- Open Split PDF by Size and add your file.
- Choose the largest size for each part, for example 10 MB.
- Press Split PDF by size and wait while the parts are built.
- Download a ZIP with all parts. Each file name shows its page range.
How it works
The tool measures each page, groups pages up to your limit, then checks the real size of every part. A part that is still too big is cut in half again. Parts are always split at page borders.
If a single page is too big
One page with a huge picture can be bigger than your limit on its own. The tool tells you when that happens. Run Compress PDF on the original first, then split.
Frequently asked questions
Will the parts be exactly the size I chose?
No. They are at most that size. Some are smaller because pages cannot be cut in the middle.
Is my file uploaded?
No. The work happens in your browser, so your file stays on your device.
Ready to start?
Open Split PDF by Size