Compress PDF for Email — Free Online, Under 25MB Instantly
You're about to hit Send when Gmail blocks your attachment — "File too large." Or worse, Outlook bounces your client's proposal before they even see it. PDFBro's compress PDF for email tool reduces your file size instantly so it fits under any email provider's limit. Whether you need under 25MB for Gmail, 20MB for Outlook, or 10MB for corporate Exchange servers, our compression handles it in seconds — with no signup and zero watermarks.
Most PDF compression tools upload your file to a server — slow, privacy-invasive, and capped with daily limits. PDFBro compresses entirely in your browser. Your PDF never leaves your device, and there are no usage caps.
Free Online Tool
Compress PDF
Reduce PDF size by up to 90% — Low, Medium, or High compression. Perfect for email attachments.
How to Compress PDF for Email — 3 Steps
Upload your PDF
Click to upload or drag your oversized PDF into the compression tool. Works with files up to 100 MB — no signup, no email, no registration.
Choose compression level
Select Low (best quality, ~30% reduction), Medium (balanced, ~60% reduction), or High (smallest file, ~80%+ reduction). For email, Medium usually hits the sweet spot.
Download and attach to email
Your compressed PDF downloads instantly. Check the file size — if it's still over your email limit, re-compress at a higher level. Then attach and send.
Email Provider Attachment Limits
Each email provider enforces different attachment size limits. Here's what you need to know before sending:
Gmail
25 MBOver 25 MB → sends Google Drive link instead
Outlook.com
20 MBOver 20 MB → upload to OneDrive, send link
Yahoo Mail
25 MBSame as Gmail — compress to under 25 MB
Corporate Exchange
10–25 MBVaries by admin settings; 10 MB is the safe universal limit
Apple iCloud
20 MBOver 20 MB → uses Mail Drop (link valid 30 days)
ProtonMail
25 MBFree plan; premium plans allow larger attachments
Why Use PDFBro to Compress PDF for Email
Frequently Asked Questions
What size PDF can I send through Gmail?
Gmail allows email attachments up to 25 MB. If your PDF exceeds 25 MB, Gmail automatically uploads it to Google Drive and sends a link instead. To send as a direct attachment, compress your PDF to under 25 MB using PDFBro's free compression tool — most files reduce by 60-80%.
What's the maximum attachment size for Outlook?
Outlook.com caps email attachments at 20 MB. Microsoft 365 / Exchange accounts may have limits between 10-150 MB depending on admin settings. For guaranteed delivery, compress your PDF to under 10 MB — this works across Gmail, Outlook, Yahoo Mail, and corporate email servers.
How fast does PDFBro compress PDFs for email?
Most PDFs compress in under 5 seconds. PDFBro processes entirely in your browser using JavaScript — no upload wait time, no server queue. Just drag, compress, and download instantly. Even 100 MB files compress in under 15 seconds.
Will compression reduce my PDF quality?
At Low compression, quality loss is nearly invisible — text stays crisp, images retain detail. Medium compression reduces file size by about 60% with minimal visual impact. High compression is best for email when file size is the top priority and the PDF is for screen viewing, not printing.