Compress Video for Email

Shrink a video to attach to email: about 18 MB for Gmail's 25 MB and 14 MB for Outlook's 20 MB, since attachments grow by a third when sent.

Runs in your browser

Browser-only · targets the real attachment size after email encoding · size checked after encoding · not affiliated with Google or Microsoft

Drop a file here or click to browse
MP4 · MOV · MKV · WebM · M4V · TS · one video at a time · Files never leave your device.
How to shrink
Size limit
Aiming at 18.0 MB. Limits as of 2026-10-04. Not affiliated with these services.
Advanced
Frame rate
Codec

Expected result

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Result

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Why a 22 MB video won't fit Gmail's 25 MB

Email turns attachments into text (Base64) before sending, which makes them about 33% larger. Gmail's 25 MB limit applies to the encoded message, so the largest video you can attach is roughly 18 MB; Outlook.com's 20 MB leaves about 14–15 MB. The presets aim at those real sizes.

Gmail switches larger files to a Google Drive link automatically, and Outlook to OneDrive. If a link is acceptable, you don't need to compress at all.

How long a video fits in an email

At 18 MB with the sound lowered to 96 kbps, about a minute fits at 720p and three minutes at 480p; beyond that, cut a section under Advanced. Lectures and screen recordings with little motion fit much longer, because they need fewer bits.

Work email and company limits

Company mail systems (Microsoft 365, Google Workspace) are often set to 10–35 MB, and some strip video attachments altogether. Choose Custom and enter your company's limit; for confidential footage, remember that nothing here leaves your device, but the email itself does.

Making sure it plays for the recipient

The result is H.264 MP4 with AAC sound, which opens in Outlook, Apple Mail, Gmail's preview and every phone. Send a short test to yourself if the recipient uses an unusual mail client.

How to use

  1. Drop a video onto the box or tap to choose one; the card shows its format, size and length.
  2. Choose your mail service: Gmail (25 MB) or Outlook (20 MB), or enter your own limit.
  3. Check the expected result, then press Compress.
  4. Compare the original and result, then download the MP4.

FAQ

Why not just aim at 25 MB?

Because a 25 MB file becomes about 33 MB once encoded for email and bounces. Choose Custom only if your provider states its limit for the raw file.

What about Naver Mail or Daum Mail?

Both send large files as download links automatically; for a regular attachment, choose Custom and enter their stated attachment limit, minus a quarter for encoding.

Can I send a long video by email at all?

Not as an attachment without heavy quality loss. Share a link (Drive, OneDrive) instead, or cut the part that matters.

Related tools

More Video tools: Video

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