Because the split only draws boundaries between pages, nothing in the document is altered; text, images, links and any bookmarks inside a part come across untouched. That also makes the parts trivial to reassemble — a merge in file-name order restores the original. All of it runs in your browser, which matters for the kind of documents that reach 20 MB in the first place. Remember the cap applies to the whole message: aim a little under the limit, since attachment encoding adds roughly a third to the size on the wire.
How it works
- Drop the PDF and open Split — choose “under a size” and type 20
- Review the parts previewed on the page board
- Split; the ZIP of measured parts downloads from your device
Questions people ask
Why aim below 20 MB rather than exactly at it?
Mail attachments are base64-encoded, which adds about a third to their size on the wire, and most servers apply their limit to the encoded message. A part of 19 MB may be rejected; 14 MB is safe. Set the limit with that headroom, or split under 10 MB to be certain.
Will bookmarks survive the split?
Bookmarks that point into a part are carried over with it; a table of contents pointing at pages in other parts cannot be, since those pages are not in the file. If you would rather split along the document’s own chapters, choose “at bookmarks” instead of a size.
Is there a faster option than emailing three parts?
With an account, Secure handoff seals the whole PDF in your browser with AES-256 and gives you an expiring, download-capped link that only carries ciphertext to Bindery’s storage. The recipient opens it in any browser without an account. The key travels in the link fragment, which browsers never send to a server.