Your server can differ
Mastodon’s user documentation describes videos up to 99 MB. Independently operated servers can use different configurations, so check the limit on your instance before choosing a target.
Video compressor
Choose your target
Checking your clips…
Drop a video here
How to make your video smaller
- Choose a preset
Start with a target above, or open Full controls for a custom maximum and video settings.
- Select your video
Choose a local file. Review the selected maximum, any resolution cap and the advice before compressing.
- Download and review
Save the result and check its quality. Upload or attach it in your destination app yourself.
Expect another processing step
Mastodon transcodes uploaded video. A smaller MP4 does not bypass instance rules or alter the post’s visibility. Review the uploaded result and add a useful media description in your Mastodon composer.
Questions about Mastodon
Is 99 MB guaranteed on every Mastodon server?
No. It is the documented default guidance. Follow the limit on the server where you post.
Can I choose a 40 MB instance limit?
Yes. Open Full controls and enter 40 MB, or any supported smaller maximum.
Can I change a preset?
Yes. Full controls opens the normal size ruler, custom maximum, resolution, frame rate and audio settings. Switching controls keeps the selected file. Presets set a maximum; the actual result can be smaller.
Will every video reach this size?
No. Very small targets can be unsuitable or fail for a long or detailed clip. Read the advice, try lower resolution or choose a larger maximum. Compression does not trim video or bypass a destination’s content and account rules.