Step by step
Add the PDF
Drag the PDF onto the upload area, or tap to pick it from Files, Downloads or a cloud folder.
Choose expiry and protection
Pick an expiry and, for confidential documents, add a password and a download limit.
Share the link
Copy the link into an email or chat, or give the receiver the 6-digit code for send.enzonic.com/receive.
Most PDFs are small. The ones that cause trouble are scans saved at high resolution, print files with embedded images and fonts, architectural drawings, and long reports full of photos. Those can run from 30 MB to several hundred, well past what email will carry.
Why big PDFs won't attach
At the time of writing Gmail limits attachments to 25 MB per message and Outlook.com to 20 MB. Email also encodes attachments, which adds about a third to the size in transit, so a 19 MB PDF can still bounce. Workplace mail servers sometimes set lower caps. Details are in files too big for email.
Send it as a link instead
Drop the PDF into the box at the top of this page. When the upload finishes you get:
- A link to paste into an email, Teams, Slack or a text message
- A 6-digit code the receiver types at send.enzonic.com/receive
- A QR code for handing a document to someone in the same room
The receiver downloads the original file in their browser. They don't need an account or an app.
Limits: up to 500 MB without an account, up to 2 GB with a free account (email or Google). Few PDFs come anywhere near that.
Where your PDF lives on each device
Finding the file is often the slowest part.
- Windows: usually in Downloads or Documents. Drag it from File Explorer into the browser.
- Mac: check Downloads, the Desktop, or wherever your scanner app saves. Drag it from Finder.
- iPhone / iPad: in Safari, tap the upload area, then Choose File. PDFs saved from Mail or Safari are usually in Files > On My iPhone > Downloads or in iCloud Drive. Scans made with the Notes app need to be shared to Files first.
- Android: in Chrome, tap the upload area. The picker shows Downloads and recent files; scanned PDFs from Google Drive's scanner may need downloading to the device first.
Settings for documents that matter
PDFs are often the sensitive stuff: contracts, ID scans, medical letters, invoices. Use the options that fit:
| Document | Suggested setup |
|---|---|
| Signed contract for one person | Password + download limit of 1 + 1-day expiry |
| Report for a team | Download limit of 10 or 50, 3-day expiry |
| Print file for a print shop | Title and message with job details, expiry up to 7 days (signed in) |
| Personal scans (ID, medical) | Password sent separately, 1-hour expiry, delete once collected |
Files are encrypted in transit (TLS) and at rest. They are not end-to-end encrypted. For highly confidential documents, you can also password-protect the PDF itself in your PDF editor before uploading. More on locking transfers in password-protected file sharing.
Should you shrink the PDF first?
If the receiver only needs to read it on screen, a smaller PDF is friendlier. If they need to print it or work from it, send the original.
Ways to reduce size without much visible change:
- Use your editor's reduced-size export. macOS Preview has File > Export with a Quartz Filter option of "Reduce File Size" (aggressive; check the result). Dedicated PDF editors have an "optimize" or "reduce size" option with more control.
- Rescan at a sensible resolution. 300 dpi is plenty for text documents; 600 dpi color scans get very large.
- Remove pages you don't need. Cover sheets and blank pages in a scan batch add up.
- Avoid zipping for size. PDFs are already compressed internally, so a ZIP rarely saves much.
Enzonic Send doesn't touch your file. Whatever you upload is what the receiver gets.
Sending a stack of PDFs
Got a folder of invoices or a set of chapter files? Select them all, or drag the folder in. Your browser zips them into one archive with the folder structure intact, and the receiver gets one download instead of twenty. See send multiple files for the details on each device.
If something goes wrong
- The receiver sees a blank or broken PDF. The file may not have finished saving or syncing before upload, which is common with cloud folders. Open it locally first, then upload again.
- The link says it has expired. The expiry time passed or the download limit was reached. Upload again with a longer expiry or higher limit.
- The upload stops on a phone. Keep Safari or Chrome in the foreground and the screen on until it completes.
- The file is over 500 MB. Sign in with a free account; the limit becomes 2 GB.
FAQ
How do I send a PDF that's too big for email?
Upload it to Enzonic Send and email the link instead of attaching the file. It works up to 500 MB without an account and 2 GB with a free one.
Will the PDF lose quality?
No. The PDF is sent exactly as you upload it. Nothing is compressed, flattened or converted.
Can I send several PDFs together?
Yes. Select them all or drop the folder. They're zipped in your browser into one download, so the receiver gets everything in one go.
How can I make a PDF smaller?
Re-save it with a reduced-size or optimized export option in your PDF editor, or rescan at a lower resolution. Zipping a PDF usually saves little.
Is it safe to send a contract this way?
Add a password, set a download limit of 1 and a short expiry. Files are encrypted in transit and at rest, but not end-to-end encrypted.
Updated 2026-10-17