Compress PDF for email attachments online for free — under Gmail and Outlook limits.
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Most email services cap attachments at 10-25 MB. Compressing a PDF to under 10 MB makes it email-friendly — typically reducing size by 60-90% with no visible loss.
Email services and corporate mail servers impose strict size limits — 10 MB on most, 25 MB on Gmail. Scanned documents and image-heavy PDFs often exceed these limits. Compressing to email-friendly sizes ensures delivery without bouncing.
| Input format | |
| Output format | PDF 1.7 |
| Target size | Under 10 MB (typical) |
| Typical reduction | 60-90% |
| Image compression | Downsample + re-encode |
| Text/vector | Preserved losslessly |
| Max file size | 50 MB per file |
| File retention | Auto-deleted after compression |
The compressor analyzes the PDF structure, downsamples high-resolution embedded images to email-appropriate resolution, re-encodes them efficiently, and strips redundant metadata. Text and vector content are preserved losslessly.
Email-optimized PDFs compress images to screen resolution — fine for reading on phones and laptops. Text stays sharp (vector content is lossless). For print-quality, use the general PDF compressor.
| Level | Size reduction | Best for |
|---|---|---|
| Email (under 10 MB) | ~60-90% | Email attachments |
Need to hit an exact size? Use our dedicated target-size tools:
Last reviewed: 2026-10-01