Aivoryx PDF Tools

Compress PDF for Email — Free & Online

A PDF full of scanned pages or photos can bounce off a strict company mail server or just be inconsiderately slow to send and download. This tool targets a conservative 5MB — small enough to clear most email systems safely, not just Gmail's outer 25MB limit — by automatically finding the highest quality that keeps your PDF's embedded images under that size, entirely in your browser. Drop in your file and download a version ready to attach.

Frequently asked questions

Why 5MB and not a bigger limit like Gmail's 25MB?
Gmail's 25MB cap is the outer limit, not a safe target — plenty of corporate email systems, older accounts, or the recipient's own inbox quota are stricter, and a smaller attachment sends faster and is less likely to bounce. 5MB is a commonly-used, conservative threshold that works almost everywhere.
Will this always get my PDF under 5MB?
If there's enough recompressible image content, yes — this tool searches for the highest JPEG quality that fits under 5MB. A large PDF that's mostly text, or already has minimal embedded images, may not have much room to shrink, and it'll say so rather than claim success it didn't reach.
What if I need a stricter limit, like 1MB or 100KB?
Use the dedicated 1MB or 100KB compression pages instead — same tool, a tighter target.
Are my files uploaded anywhere?
No. Compression happens entirely in your browser in a background thread; your file never leaves your device.

Need a stricter limit? Compress to 100KB · Compress to 1MB · or use the full Compress PDF tool with a manual quality slider.