Use case · Email
Best File Format for Email Attachments
Email attachments fail for two reasons: the client can’t open the format, or the message exceeds size limits. Pick formats for compatibility first, then shrink.
Quick take: Documents → PDF. Photos → JPG (PNG if transparency). Video → MP4. Bundle → ZIP. Convert niche formats before you hit Send.
Documents
PDF freezes layout across devices. Convert Word/PPT when the recipient only needs to read, not edit.
Images & camera rolls
HEIC from iPhones often frustrates Windows users — convert to JPG. Skip sending huge PNGs of photos when JPG is enough.
Video & archives
Prefer MP4 over MOV. Use ZIP for folders, but compress media first so the archive isn’t enormous.
Key points
- Compatibility beats niche masters in email.
- Convert HEIC/MOV before attaching.
- Shrink before you ZIP.
Convert with Format Convertly
Open a converter for this job — processing stays in your browser.
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FAQ
Should I attach DOCX or PDF?
DOCX for collaboration; PDF when layout and “final” reading matter more than editing.
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