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Split by File Size

Break a big PDF into parts under an MB limit

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About Split by File Size

If email or a portal refuses anything over 5 MB, set your limit and the tool cuts the PDF into parts of that size and hands them over in a ZIP. Pages are never cut in half.

How to split a PDF by file size — step by step

  1. Upload the PDF.
  2. Type the maximum size each part may be, in megabytes.
  3. Download the parts, each one under your limit.

When a file simply will not fit

Email attachments cap out around 25 MB. Government portals often allow 2 MB, sometimes less. WhatsApp has its own limit. If compression is not enough, the document has to be broken into parts.

This tool works out where the page breaks fall so that every part stays under the size you set, rather than making you guess at page numbers and check each result.

Try shrinking before splitting

One file is always easier for the person receiving it than four. Run Compress PDF first — a scanned document often drops by 80% and no longer needs splitting at all. If it is a colour scan of text, PDF to Black & White makes an even bigger difference.

If you do have to split, name the parts clearly — 'Part 1 of 3' — and say so in your covering message.

Frequently asked questions

Do pages get split in the middle?

No, every part contains whole pages only.

What if I need it even smaller?

Run Compress first, then split.

Is my file uploaded?

No. It is split in your browser.

Will each part be exactly my limit?

Each part stays under it. Pages cannot be divided, so parts vary a little in size.

What if one page alone is over the limit?

That page cannot be made smaller by splitting. Compress the file first.

Can I rejoin them later?

Yes, with Merge PDF.

🔒 Everything on this page happens inside your browser. Your file is never uploaded to a server.

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