How to reduce a PDF's size so it fits an email
Last updated: June 25, 2026
Email providers cap attachments, and PDFs love to blow past those caps. The usual limits are around25 MB for Gmail and Outlook, but many corporate inboxes and web forms stop at10 MB or even less. Here's how to shrink a PDF to fit — in seconds, for free.
The fastest fix: compress it
- Open the Compress PDF tool and choose your file.
- Start with the Recommended level. If it's still too big, try Strong.
- Press Compress PDF. You'll see the before/after size and the percentage saved.
For scanned documents — the usual culprits behind huge files — this often cuts the size by 70–90%, which is more than enough to clear a 10 MB limit.
Other ways to slim a PDF
- Send fewer pages. If the recipient only needs part of it, extract those pages first — fewer pages, smaller file.
- Rebuild scans from images. If you have the original photos, building the PDF from images and then compressing gives you control over size.
- Zip it as a last resort. Compressing the PDF itself is far more effective than zipping, but a ZIP can help squeeze a little more.
Common attachment limits
- Gmail / Outlook.com: ~25 MB per email.
- Many business mail servers: 10 MB.
- Web upload forms: often 5–10 MB.
Aim a little under the limit — encoding adds a bit of overhead in transit.
No upload required
The compression runs entirely in your browser. Your document — invoice, contract, scan — never leaves your device, which is exactly what you want for anything you'd hesitate to upload.