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Compress a video to email size

Gmail and Outlook both draw the line at roughly 25 MB per message, and the video from your phone is usually five times that. Compressing to 720p at a moderate bitrate brings a few minutes of footage under the cap without making it look like 2009.

The compressor opens on the 720p / 2 Mbps preset, which fits about 90 seconds of video in 25 MB. It shows the size estimate up front and the true measured size after, so no surprise bounces.

Processed locallyIn: MP4, WebM, MOV (browser-dependent)Out: MP4, WebM

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This is Compress Video preconfigured for this task — open the full tool for every option.

How it works

  1. Select a video; its resolution, duration, and size are shown.

  2. Choose MP4 (H.264/AAC) or WebM (VP9/VP8), then pick a preset or custom resolution and bitrate.

  3. Export — the video replays through a scaled local canvas and re-encodes at the chosen bitrate and supported browser codec.

  4. Before/after sizes are reported from the actual output bytes.

What the tool does

  • Resolution scaling with aspect ratio preserved
  • Target bitrate control with realistic size estimates
  • Audio included at reduced bitrate or removed entirely
  • Real MP4/H.264-AAC output where the browser exposes that encoder, with WebM retained as a fallback
  • Honest reporting when compression can't beat the original size

How the result is verified

The selected MP4 or WebM container signature is checked, then the compressed output is re-decoded locally to confirm it plays. Its true byte size and duration are measured before download.

Frequently asked questions

How much video fits in 25 MB?

About 90 seconds at the 720p preset, or around 3 minutes at 480p. The preview estimate updates as you change settings, so you can dial it in before exporting.

Wouldn't a cloud link be easier?

Sometimes, but then your video sits on someone's server. Compressing locally keeps the recording on your machine and inside the email itself.

Understand the format

Technical guidance for choosing settings and reviewing the result.

How to make a video smaller without guessing

Video compression is a set of measurable tradeoffs, not a mystery slider. Here is what actually changes file size, how to estimate the result, and which setting to adjust first.

8 min read · Reviewed August 2026

MP4 vs. WebM: the container is not the codec

An .mp4 or .webm extension names a container, not a quality level. The streams inside—and the browser or device that must decode them—are what determine compatibility and size.

7 min read · Reviewed August 2026