When your PDF attachment is too big to send: a free simple solution
"The attachment size is too big." If your email client just refused to send a PDF, you have hit the attachment limit that almost every provider enforces. Here are the actual limits, and three free ways to get your file delivered anyway.
Email attachment size limits
Most mail services cap a single message, including all its attachments, at around 20 to 25 MB:
- Gmail: 25 MB;
- Outlook and Microsoft 365: 20 MB;
- Yahoo Mail: 25 MB;
- iCloud Mail: 20 MB.
Because attachments are re-encoded for transfer, the real ceiling is lower than the advertised number. A 24 MB PDF can still bounce from Gmail. If your file is anywhere near the limit, shrink it before you press send.
Option 1: compress the PDF
In most cases you can reduce the size of a PDF significantly without any visible loss of quality. Compression finds repeating patterns and oversized images inside the file and rewrites them with fewer bytes:
- Open the free Online PDF Compressor.
- Upload your PDF, or drag and drop it onto the page.
- Download the smaller file and attach it to your email as usual.
On a normal screen the compressed file looks practically identical to the original, so for everyday documents this is the fix to try first. For a closer look at how it works, see our guide on how to compress a PDF.
Option 2: split the PDF into smaller parts
If the document must keep its full quality, split it into two or more PDFs and send them in separate emails. The free Split PDF tool lets you pick the page ranges, and each part stays a regular PDF the recipient can open directly.
Option 3: share a link instead of an attachment
File-sharing services such as Google Drive, Dropbox, or OneDrive let you upload the PDF and email a download link instead. This works for files of any size, but the recipient may need an account to get the file, and many people prefer downloading attachments straight from their mailbox. Keep it as the fallback for very large documents.
For everything else, compressing wins: no new accounts, no extra steps for the recipient, and the PDF arrives as a regular attachment.