How to Reduce Video File Size to Fit Email and Upload Limits

Why are videos so big?

Video size is basically bitrate (data per second) × length. Phone 4K video uses tens of Mbps, so even one minute can reach hundreds of MB.

For phone and laptop screens, 720p–1080p at 1–3 Mbps looks sharp. Lowering resolution and bitrate to match where it will be watched cuts size to a fraction.

Compress to a target size

1. Drop the video into the Video Compressor and choose Target file size.
2. For email, enter about 20–25 MB; for chat apps or forums, a bit under their limit. Limits differ by service and change often, so check the current one.
3. The tool calculates the bitrate from the length. If the result would be bigger than the original, you get the original back.

A very small target for a long clip can look blocky. Lowering the max resolution to 720p or 480p at the same time often looks cleaner.

What's enough for each resolution

Trimming saves the most

Size scales with length, so cutting unneeded parts is the most effective step. By default (with "Frame-accurate cut" off) the Video Trimmer cuts in seconds without re-encoding, so quality doesn't drop at all. Trim first, then compress for the smallest, cleanest file.

Check the format too

iPhone MOV, screen-recorded WebM or downloaded MKV files don't play everywhere. For sharing or submitting, convert to the most compatible MP4 (H.264) with the Video Converter. The compressor also saves MP4 by default.

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