Should I use MP4 or WebM?

For most use cases, MP4 is the recommended default. Use MP4 when: maximum compatibility, platforms that require mp4. Use WebM when: modern web delivery, background loops, smaller files.

Can I convert between MP4 and WebM?

Yes. Use optimo to convert between them with a single command. Run "npx optimo file --format webm" to convert from MP4 to WebM.

MP4 vs WebM

MP4 is the compatibility king. WebM can be smaller and is great for web-first delivery, but you may want MP4 as a fallback.

Last updated: 2026-03-18

MP4 is the compatibility king. WebM can be smaller and is great for web-first delivery, but you may want MP4 as a fallback. For most projects, MP4 is the recommended default.

Key differences

Topic	MP4	WebM
Compatibility	Highest	Modern browsers
Typical size	Baseline	Often smaller
Fallback strategy	Often none	MP4 fallback recommended

When to use MP4

Maximum compatibility
Platforms that require MP4

When to use WebM

Modern web delivery
Background loops
Smaller files

Our recommendation

For most web projects, use MP4. MP4 maximum compatibility. Choose WebM when modern web delivery.

Next steps

Optimize MP4 Compress MP4 Resize MP4 MP4 format guide

Convert between them

Convert MP4 to WebM Convert WebM to MP4

Frequently asked questions

What is the difference between MP4 and WebM?: MP4 is the compatibility king. WebM can be smaller and is great for web-first delivery, but you may want MP4 as a fallback.
Should I use MP4 or WebM?: For most use cases, MP4 is the recommended default. Use MP4 when: maximum compatibility, platforms that require mp4. Use WebM when: modern web delivery, background loops, smaller files.
Can I convert between MP4 and WebM?: Yes. Use optimo to convert between them with a single command. Run "npx optimo file --format webm" to convert from MP4 to WebM.