Compress Video to 4MB for Instant Uploads
Compress video to 4MB for instant email and portal uploads. High-profile H.264 with 720p/1080p fidelity. Private client-side processing.
Instant client-side compression · Up to 2 GB per file · Zero server upload
Technical Architecture & In-Browser Processing
Many enterprise mail servers enforce strict 5MB attachment limits. Targeting 4MB guarantees your video slips comfortably under firewalls without triggering bounce-backs caused by MIME encoding inflation. Our algorithm retains up to 1080p resolution while applying motion-compensated deblocking filters and 96 kbps stereo sound. The resulting MP4 is universally playable without requiring third-party codec packs.
Compressing video to 4MB provides a protective cushion for email servers enforcing strict 5MB attachment caps. Because email protocols apply base64 MIME encoding that inflates raw binary payloads by roughly 33%, a 4MB file transmits safely at approximately 5.3MB across major corporate gateways. The video maintains crisp 720p clarity with broad player hardware compatibility.
Frequently Asked Questions
Why is 4MB the ideal target for email video?
Email attachments expand by ~33% when base64 encoded. A 4MB video expands to ~5.3MB, safely fitting under corporate gateways.
Can 1080p resolution be preserved at 4MB?
Yes, clips up to 45 seconds can preserve full 1080p clarity under 4MB using our 2-pass rate shaper.
Does FitSize support WebM input for 4MB output?
Yes, FitSize decodes WebM, MP4, MOV, and AVI inputs, converting them seamlessly to lightweight MP4 files.