How to Reduce File Size for Email Attachments

You've finished a document and the attachment is 28MB. Gmail's limit is 25MB. Now what? The answer is usually a combination of compression (making the file smaller) and knowing when to switch from attachment to file-sharing link.

For PDFs: Online Compression

A PDF compressor analyzes your document and applies image compression and other optimizations. Most documents compress 30–60% with no perceptible quality loss for screen viewing. Print-quality documents might see more compromise — check the output before sending.

For Images: Right-Sizing and Format Choice

A photograph at 6000×4000 pixels (typical smartphone photo) is 4–8MB as a JPEG. Resized to 2000×1333, it's under 1MB and looks identical on any screen. Use our Image Resizer to downsize images before attaching. For photos going into documents rather than being viewed at full size, 1200–1600px wide is more than enough.

The Better Option: Don't Attach at All

For files over 10MB, sharing via link is usually better than compressing aggressively. Google Drive, Dropbox, OneDrive, and WeTransfer (free for up to 2GB) let you share links that don't expire immediately. The recipient gets the full-quality file, you avoid the attachment size battle, and the email sends faster.

Zipping Multiple Files

Zipping PDFs doesn't help much — PDFs are already compressed. But zipping multiple files into one archive reduces the attachment count, which some email clients limit. Zip does meaningfully compress text files, Word documents, and CSVs. Right-click > Compress or Zip on Windows/Mac handles this without any additional software.