Compress PDF for Email: Compress PDF for Email opens Compress PDF with the Fit under a size box set to 10 MB and page flattening switched off, so the text in your document stays selectable and searchable. Gmail and Outlook.com both allow 25 MB of attachments on a personal account, according to their help pages in October 2026; work and school accounts follow limits their administrator sets, and some mail servers stop at 10 MB. FreeAIPDF runs 100% locally in your web browser using WebAssembly. Your files never leave your device, guaranteeing absolute confidentiality, zero subscriptions, and no file size paywalls.
Compress PDF for Email opens Compress PDF with the Fit under a size box set to 10 MB and page flattening switched off, so the text in your document stays selectable and searchable. Gmail and Outlook.com both allow 25 MB of attachments on a personal account, according to their help pages in October 2026; work and school accounts follow limits their administrator sets, and some mail servers stop at 10 MB.
Email carries an attachment encoded as text, which makes it about a third larger on the way, and some mail servers count that larger size, so aim below the published limit: 10 MB leaves room on the services above. For a different limit, tap another size or type one in KB (1 MB is 1024 KB). The compression runs in your browser, so the file is never uploaded.
How to use Compress PDF for Email
- 1Click Select files, or drop the PDF you want to send onto the page.
- 2The size box already says 10240 KB, which is 10 MB. Keep it, or tap or type the size for your mail service.
- 3Click Fit under 10 MB. The note shows the size reached and the setting used; a file already under the size is left as it is.
- 4Download the file, named with -under-10MB, and attach it.
Compress PDF for Email Specifications & Privacy Overview
Core technical parameters and security disclosures for Compress PDF for Email.
- Processing Architecture
- 100% client-side, runs in your browser
- Data Transmission
- 0 bytes uploaded; the file never leaves your device
- Usage & Cost
- 100% Free; unlimited daily document processing
- Account Requirement
- Zero sign-up, no email, no payment details
- File Capacity
- Up to 100 MB per file
- Platform Compatibility
- Windows, macOS, Linux, iOS (iPhone/iPad), Android
Why FreeAIPDF vs Cloud PDF Converters
| Security & Capability | FreeAIPDF (Client-Side) | Other Online Converters |
|---|---|---|
| Document Privacy | ✓ 100% Local (0 bytes uploaded) | ✗ Uploaded to external servers |
| Pricing & Limits | ✓ Completely Free & Unlimited | ✗ Daily caps & paid tiers |
| User Accounts | ✓ No signup or email required | ✗ Forces registration |
| Execution Speed | ✓ Instant client-side engine | ✗ Network upload & queue delay |
Technical Architecture & Verifiable Security
Verifiable client-side sandbox execution parameters for enterprise, compliance, and privacy verification:
Frequently asked questions
- What is the maximum attachment size for Gmail and Outlook?
- Gmail's help page gives 25 MB for attachments on a personal account, and Outlook.com's gives 25 MB for attached files, both as of October 2026. Work and school accounts on either service follow limits set by their administrator, which can be lower. For anything larger, both let you share a Google Drive or OneDrive link instead.
- Why is flattening switched off on this page?
- So the text stays selectable and searchable, which matters for a contract or a form the recipient has to read or copy from. If a scan still does not fit, tick Flatten pages to images if that is the only way to fit and run it again; the pages then become pictures and the text can no longer be selected.