Split PDF by File Size
Split a large PDF into smaller files that each stay under a size limit, like an email attachment cap, entirely in your browser. Nothing is uploaded to a server.
Drag a PDF here, or click to browse
How to split a PDF by file size
- Upload a PDF file.
- Choose a maximum size per file: a preset (5, 10 or 25 MB) or a custom value.
- Click "Split by Size". If the result is more than one file, you'll get a ZIP download.
FAQ
Are my files uploaded anywhere?
No. Splitting happens in your browser using JavaScript. Your PDF never leaves your device.
How is this different from Split PDF?
Split PDF divides a document by page ranges you choose. This tool instead groups pages automatically so each output file stays under a size limit you set, without you having to work out the page ranges yourself.
What if a single page is bigger than my size limit?
That page still ships on its own, since a single page can't be split further. Every other file stays at or under your chosen limit.