You attach a 40 MB scan, press send, and the email bounces or Outlook refuses the attachment. Every mail service has a size cap, and PDFs of scanned documents pass it easily.
You can shrink the file, share a link, or split the PDF into parts that each fit. Splitting by size keeps full quality and needs no cloud account.
| Service | Attachment limit |
|---|---|
| Gmail | 25 MB per email |
| Outlook.com | 20 MB per email |
| Yahoo Mail | 25 MB per email |
| Microsoft 365 / Exchange | Set by the organisation's admin; often 25 to 35 MB |
The recipient's server has a limit too, and it may be lower than yours.
| Option | Good | Not so good |
|---|---|---|
| Compress the PDF | One file | Scans lose sharpness; may still be too big |
| Share a cloud link | Any size | Recipient needs access; some firms block links |
| Split by file size | Full quality, plain attachments | Several emails or attachments |
Magic Soft PDF Split & Merge has a By File Size mode. You set a maximum size in MB and it groups pages into files under that size.
Load the large file, or several of them.
Enter the maximum, for example 10 MB.
Pick an output folder and click Start. Each part is a normal PDF with consecutive pages.
If a single page is larger than the limit by itself, it goes into its own file, so no page is ever dropped. Original quality is kept because pages are copied, not recompressed.
Rename the outputs Report part 1 of 4.pdf and so on, and say in the email how many parts to expect.
The recipient can read the parts as they are. If they want one file, they can merge them in order with Preview on a Mac or any PDF merge tool. See how to merge PDF files.
Keep each attachment well under the limit to allow for encoding, around 10 to 15 MB for most services. Splitting by file size keeps the quality and works with any email account. For other ways to divide a PDF, see how to split a PDF.
Gmail allows 25 MB per email, but encoding adds about a third, so a PDF around 18 MB is close to the real maximum.
No. Splitting by size copies pages as they are. Only compression reduces quality.
PDF Split & Merge puts that page in its own file so it isn't lost.
Yes. Add them all and run the By File Size split in one go.
For very large files, often yes. But some recipients block links or need the files as attachments, which is when splitting helps.
