Fix unsupported video
Export a widely supported MP4, or choose another output. Processing stays on your device.
Drop files to convert
See their format, then choose an output.
Any media file this browser’s engine can read. You can also drag in a folder. Several at once needs a free account.
How to fix an unsupported video format
Convert the file to an MP4 with H.264 video and AAC audio, a widely supported combination for browsers and media players. The conversion runs locally, and you can inspect the output before downloading it.
Step 1
Choose the filePick the video that will not play or upload.Step 2
Create a compatible copyKeep the H.264 and AAC MP4 preset.Step 3
Download the MP4Check the result and save the fixed video.
What to expect
- Supported inputs
- Any media file this browser’s engine can read.
- What happens
- The fix exports an MP4 with H.264 video and AAC audio until a different output is chosen.
- Limits
- The page exports a widely supported MP4 when this browser can encode it. Not every file will play everywhere.
Private by design
Your video stays on your device
Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.
- No upload
- No signup
- No watermark
Questions
An MP4 with H.264 video and AAC audio, until you choose a different output.
No. The page exports a widely supported MP4 when this browser can encode it.