Compress PDF for
Email Attachments
Gmail caps attachments at 25MB. Corporate email servers often stop at 10MB. Compress your PDF to sail through any inbox without a bounce-back.
Why email providers reject large PDFs
Email servers enforce attachment limits to prevent storage abuse and slow mail queues. The limits vary by provider and can be much tighter than you expect:
- Gmail — 25MB per email across all attachments combined. Files over this limit are automatically replaced with a Google Drive link.
- Outlook.com — 20MB limit for free accounts. Microsoft 365 business accounts are capped by IT policy, often 10MB or less.
- Corporate and government email servers — commonly set to 10MB or even 5MB. These systems reject oversized emails silently or return a bounce with a confusing error message.
- Yahoo Mail — 25MB per email.
Compressing to under 10MB ensures your PDF gets through to any recipient on any mail server. For sensitive documents like payslips, agreements, and ITR acknowledgements, compressing entirely in the browser also means the file never touches an online server.
Recommended preset for email
For most office documents sent over email — reports, invoices, agreements, presentations exported as PDF — the Recommended preset is the right choice. It keeps text crisp and readable while cutting file size by 30–60%. Signatures, letterheads, and small logos stay clear.
Use Maximum Compression only if your document is a scanned image (passport, certificate, bank passbook) and you need to push it below 5MB. Maximum Compression slightly softens scanned text but keeps it legible for business email purposes.
How to compress a PDF for email in 5 steps
- Open Compress PDF on LovelyPDF — no account or installation needed
- Upload your PDF by dragging it onto the drop zone or clicking to browse
- Choose Recommended for office documents, Maximum for scanned pages
- Click Compress PDF — the new file size is shown before download
- Download and attach the compressed PDF directly to your email
Tips for confidential documents
Payslips, bank statements, NDAs, and personal agreements should be compressed before emailing — but not at the cost of privacy. Because LovelyPDF processes everything in your browser, your document never passes through any server. You can also add a password to the compressed PDF using Protect PDF before attaching it, so only the intended recipient can open it.
Frequently asked questions
What is the email attachment size limit for Gmail?
Gmail allows attachments up to 25MB per email total across all attached files. Outlook.com caps at 20MB. Corporate mail servers — used by most banks, government offices, and large companies — often enforce a stricter 10MB or 5MB limit. Compressing your PDF to under 10MB ensures it reaches any recipient on any mail server without a bounce.
How small can I compress a PDF?
It depends on the content. Scanned PDFs (photographs of documents) typically compress by 70–90% — a 20MB scan can reach 2–4MB under Maximum Compression. Text-only PDFs compress by 20–50% because text is already stored efficiently as vectors. LovelyPDF shows you the exact size after compression before you download, so you can see whether a second pass or page removal is needed.
Is my PDF safe when I compress it online?
Yes. LovelyPDF runs entirely in your browser using JavaScript — your file is never sent to any server, never stored in the cloud, and never visible to anyone else. This is true for payslips, ITR documents, bank statements, and any other sensitive PDF you compress. The process is the same whether you are on home Wi-Fi or a corporate network.
Will text be readable after compression?
For text-based PDFs (generated by Word, Excel, or similar software), text stays perfectly sharp at any zoom because it is stored as mathematical outlines, not pixels. For scanned PDFs under Maximum Compression, text will appear slightly softer than the original scan but remains clearly readable. If the document will be read carefully or printed, use the Recommended preset for a better balance between size and quality.