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Fix a video that won’t play
"This file is not supported" is the most fixable error in computing. Ninety percent of unplayable videos are healthy files in the wrong container — here is the diagnosis and the two-minute cure.
Open the Video Converter — free →Advertisement
Step by step
- Note the extension: MKV, WEBM, AVI and FLV are the usual suspects on TVs, phones and older players.
- Upload the file to the Video Converter and choose MP4.
- Convert — the picture is re-encoded faithfully into the container everything plays.
- Test the MP4 where the original failed before deleting anything.
Tips from people who do this a lot
- If the video plays on your computer but not your TV, it is the container or codec, not corruption — TVs are the pickiest players alive.
- A file that plays with no sound has an audio codec the player lacks; converting fixes that too.
- Genuinely corrupt files stutter or die mid-play in every player — that is the rare case conversion cannot save.
FAQ
Will converting an unplayable video lose quality?
At the default settings, no visible loss for normal viewing — and an unplayable video has no quality at all until it plays.
Why do downloads arrive in odd formats at all?
Because serving sites optimise for their bandwidth (WEBM) or their apps (MKV), not for your television.
Is this really free?
Yes — every tool on this site is free. A short ad before your download is what pays the server bills, so nothing needs a paywall or an account.