How to Share Large PDF Files via Email (When Attachments Are Too Big)

You have a fifty-megabyte PDF and an email client with a twenty-five-megabyte attachment limit. The file will not send. You could compress it, split it, or upload it somewhere and send a link instead. Which approach works best depends on the file, the recipient, and what you need to preserve.

Here are four methods to share large PDFs via email, ranked from simplest to most flexible.

Method 1: Compress the PDF to fit the limit

If your PDF is between twenty-five and fifty megabytes, compression is usually the fastest fix. Reducing image resolution from 300 DPI to 150 DPI typically cuts file size by sixty to eighty percent with no visible quality loss for screen viewing.

1. 1Open the Compress PDF tool in your browser.
2. 2Drop your PDF into the tool.
3. 3Pick a compression level. "Recommended" works for most documents.
4. 4Download the compressed file and attach it to your email.

Method 2: Split the PDF into smaller parts

When compression alone is not enough, or when you only need to share a portion of the document, splitting the PDF into smaller files lets you send each part as a separate attachment.

1. 1Open the Split PDF tool.
2. 2Drop your PDF into the tool.
3. 3Choose how to split — by page range, every N pages, or by section.
4. 4Download the individual files and attach them to separate emails.

Tell the recipient which email contains which pages, or send them in a single email with multiple attachments if the combined size fits.

Method 3: Share via a download link

For PDFs that remain too large even after compression, uploading the file and sharing a link avoids attachment limits entirely. Several free services let you upload a PDF and generate a shareable link with no account required.

Upload the file, copy the link, and paste it into your email. The recipient clicks the link and downloads the PDF — no special software required.

Method 4: Compress and split together

For very large PDFs — scanned documents, photo-heavy reports, multi-hundred-page files — combining compression with splitting gives the best results:

1. 1Compress the PDF first to reduce overall size.
2. 2If it is still over the attachment limit, split it into sections.
3. 3Send each section as a separate email attachment.

This approach keeps everything as direct email attachments rather than relying on external links, which some recipients prefer for security reasons.

Email attachment limits by provider

Which method to choose

• Under 50 MB — compress the PDF. It will almost always fit.
• 50 MB to 200 MB — compress first, then split if still too large.
• Over 200 MB — upload and share a link. Compression alone will not help.
• Recurring large files — set up a cloud folder and email the link.

Sharing large PDFs on a phone

All the methods above work on iPhone and Android. Compress the PDF in your mobile browser, split it using a browser-based tool, or upload to WeTransfer or Google Drive from your phone and share the link via email or messaging apps.