What if one page is bigger than the limit on its own?

That page becomes its own part and the result flags it. A single page cannot be split further without converting it to images.

Why are parts a bit under the limit rather than exactly at it?

Pages are added until the next one would cross the limit, so each part lands just below it. This leaves headroom for email encoding overhead.

This runs entirely in your browser — the file is never uploaded to a server.

Break a big PDF into parts that each stay under a size you choose.

Files are processed on your device and never uploaded.

Add a PDF to split by size

Drag & drop or click to browse

1
Add a PDF
Drop the large PDF you need to send.
2
Set the size limit
Pick a target maximum size per part (common email limits are 10, 20 or 25 MB).
3
Split
Pages are packed into parts on your device, each kept under the limit.
4
Download
Save the parts individually or as a single ZIP.

What if one page is bigger than the limit on its own?: That page becomes its own part and the result flags it. A single page cannot be split further without converting it to images.
Why are parts a bit under the limit rather than exactly at it?: Pages are added until the next one would cross the limit, so each part lands just below it. This leaves headroom for email encoding overhead.
Are my files uploaded?: This runs entirely in your browser — the file is never uploaded to a server.