PDF too big to email: what to do right now

Compress it under the limit, now

Drop the file, keep the Email preset (or type a size target, such as 18 MB), and read the result: the size before and after, and the pages that changed most. On our test files the Email preset takes a 10-page colour scan from 17.6 MB to 1.7 MB and 5 phone photos from 14.7 MB to 395 KB. Any text in the file stays sharp, because text in a PDF is not an image and compression never touches it.

The limits you are hitting

The “send at most” column is the real number. Email encodes attachments in a format that adds about a third to their size (Microsoft states 33 %), so a 24 MB PDF travels as roughly 32 MB and bounces off a 25 MB cap. Divide any stated cap by 1.33 and stay under that. One more trap: the receiver’s server has its own cap, and a bounce from their side looks the same as one from yours. The caps were checked on 11 October 2026 against each provider’s help pages; the full table with sources is in email attachment size limits.

Why your PDF is big in the first place

In an oversized PDF, nearly all the bytes are pictures: scans, photos, a logo repeated on every page. A 30-page contract written in Word is often under 1 MB; the same contract scanned at 300 dpi in colour is about 53 MB, at the 1.8 MB a page our test scan weighs. Compression works by re-encoding those pictures at a resolution that matches how they are read, which is why a scanned file shrinks dramatically and a text-only file barely moves. The full story, with the levers you can pull, is in Make a PDF smaller.

Still too big: split it or send a link

When a file cannot reach the cap at a quality you accept (a 200-photo album is still about 22 MB on the Email preset, at the 110 KB a photo our test album came to), 2 honest options remain:

1. Split it into parts. Cut at chapter or section breaks so each part stands alone, name them so they sort (report-part-1-of-3.pdf), and say in the email how many parts are coming. The Split PDF tool does this by page ranges.
2. Send a link. Gmail switches to a Google Drive link automatically above 25 MB, Outlook offers OneDrive, and iCloud uses Mail Drop. A link carries no size problem, but it changes who can access the file and for how long, so for anything confidential read how to send a large PDF first.

What this page does not do

Compression cannot shrink what is not there: a PDF that is already mostly text, or one that was compressed before, may only lose a few percent, and the tool tells you so instead of delivering a file no smaller than the original. It also does not crop pages, remove pages or lower the page count; if only 5 pages of 60 matter to the receiver, extract those pages instead, which beats any compressor.