You sent a 32 MB pitch deck. It bounced. You apologised, compressed, resent. The client opened the deck four hours later than they should have. First impression: not your best.
Compress before sending. Always. Here's why it's worth making automatic.
Email size limits are real
Most corporate email systems reject attachments over 20–25 MB. Gmail caps at 25 MB. Outlook at 20 MB by default. Even when they accept, the bounce rate climbs as size grows.
Under 10 MB is the safe zone — virtually no system rejects, and most users can preview inline without downloading.
Compression is fast and lossless for text
Flint compress takes 5–10 seconds for typical PDFs. Text quality is unchanged. Image quality drops only for screen-irrelevant detail — the visible result is indistinguishable from the original for most users.
Most PDFs compress 60–80%. A 30 MB file becomes 4–10 MB with no visible loss.
Recipient experience improves dramatically
Small PDFs open faster, especially on mobile. They preview inline. They don't fill the recipient's storage quota. They feel more polished.
The recipient never knows you compressed — they just notice your PDFs are pleasant to receive. Subtle but meaningful.
Build the habit into your send
Treat compression like signing — a final step in the outbound workflow. Open the PDF in Flint, compress, attach, send. Five extra seconds; permanent uplift.
For outgoing PDFs over 10 MB, the rule is: compress or share via link. Never attach the original.
FAQ
Does compression hurt printable quality?
For office-document printing (memos, contracts, reports), no — the compression targets oversized image data. For high-quality print production, use lighter compression or skip it.
What about PDFs with mostly text?
Less to compress — typically 20–40% reduction. Still worth doing; even smaller files open faster on mobile.
Should I compress before archiving too?
Yes, for the same reasons. Storage and backup are faster with smaller files.
What if the recipient prefers high-res?
Ask first for genuine print production cases. Otherwise, default to compressed. Most recipients prefer fast over high-res.
Compression is the cheapest professionalism upgrade in your workflow. Compress your next send in Flint and notice the difference in how PDFs land.