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Stop the "file too large" bounce-back for good

Fix file too large for email error

Email servers reject attachments over 10–25 MB — and your PDF keeps bouncing. The fix isn't a workaround link. It's automatically reducing the PDF size before sending, so your document arrives every time without losing readability. The Compress PDF API handles this in your pipeline before delivery.

Try It Free
Avg size reduction
-68%
Readable quality
Preserved
API setup time
< 10 min
Before vs After
report-Q4-2025.pdf 28.4 MB
❌ Gmail rejected: "Attachment exceeds size limit"
↓ compress-pdf-api
report-Q4-2025-compressed.pdf 7.1 MB
✅ Delivered. Quality unchanged for screen/print.

10 MB

Gmail/Outlook default limit

68%

average compression ratio

2.1s

median compression time

100%

structure preserved

Why PDF attachments keep failing

Scanned pages bloat file size

A 20-page scan at 300 DPI can be 30+ MB. Compression reduces image resolution to screen-quality without visible quality loss.

Embedded fonts add megabytes

Full font sets are embedded by default. Subset compression strips unused glyphs, cutting font overhead by 80%+.

Manual "save smaller" isn't repeatable

Relying on team members to remember compression settings creates inconsistency. An API step enforces it automatically on every export.

Add compression to your PDF workflow in one step

  1. 1

    Generate or receive the PDF as usual

    Don't change your existing document generation workflow.

  2. 2

    Pass it through the Compress PDF API

    One POST request. Choose quality level: screen, ebook, printer, or prepress.

  3. 3

    Deliver the compressed PDF

    Attach it to your email, store in S3, or serve via your portal — always under the size limit.

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FAQ: fixing email attachment size limits

Will compression make my PDF look worse?
For screen viewing and standard printing, the difference is invisible. The API offers multiple quality presets — choose "ebook" for email delivery and "printer" when print quality matters.
Does it work for scanned PDFs too?
Yes. Image-heavy scanned PDFs often see the largest size reductions since embedded JPEGs are recompressed at optimal quality levels. The text layer and structure remain intact.
How do I avoid the size limit issue entirely in my pipeline?
Add compression as a mandatory post-generation step. Every PDF that leaves your system passes through compression automatically — no relying on training or reminders.