About Convert Video
Change a video from one container or codec to another so it plays on the device, editor, or platform you actually need it for.
How convert video works
A video file is really two things bundled together: a container (the wrapper, like MP4, MOV, MKV, WebM) and a codec (the way pixels are encoded inside that wrapper, like H.264, H.265, VP9, AV1). When something refuses to play, it’s almost always because the player understands the container but not the codec, or vice versa.
Format conversion either remuxes (rewrapping the same data into a new container, which is fast and lossless) or transcodes (decoding the video and re-encoding with a different codec, which is slower and slightly lossy). NextConvert picks the right one automatically. If your input already has a compatible codec, we remux. Otherwise we transcode at high quality.
This matters most when moving footage between worlds: an iPhone HEVC clip into a Windows tool that can’t read HEVC, an AVI from an old camcorder into Premiere, a WebM screen recording into iMovie, or a VP9 YouTube download into an MP4 your TV will recognize.
When to use it
iPhone to Windows
Convert HEVC / .MOV recordings to H.264 MP4 so they open in Windows Media Player, PowerPoint, or Premiere.
Editor compatibility
Turn WebM, MKV, or AVI clips into MP4 / MOV that drop straight into Final Cut, DaVinci Resolve, or Premiere.
Browser playback
Convert MOV or MKV to MP4 or WebM so they play inline on any website without a download.
Legacy devices
Re-encode modern HEVC / AV1 content as H.264 for older smart TVs, cars, and game consoles that don’t support the newer codecs.
Supported formats
Input
Output
Step-by-step guide
- 1
Upload your video
Drop in any common video format. We detect the codec automatically, so you don’t need to know what’s inside.
- 2
Pick the output format
Choose MP4 for maximum compatibility, WebM for the web, MOV for Apple workflows, or MKV if you need to preserve multiple audio and subtitle tracks.
- 3
Convert and download
We stream the converted file back to your browser. Most conversions finish in under a minute thanks to hardware acceleration on our servers.
Tips for the best result
- If you don’t know which format you need, choose MP4 (H.264). It plays on practically everything built in the last 15 years.
- WebM produces smaller files than MP4 at the same quality, but isn’t supported by Safari before iOS 14. Choose it only if your audience is on modern Chrome / Firefox / Edge.
- Converting from MP4 to MP4 is a no-op unless you change codec or settings. If you just want a smaller file, use Compress. If you want a new container, use Convert.
Privacy and security
Files are uploaded to our processing servers over an encrypted connection and removed automatically after the job completes (usually within a few hours). We never share your media or train models on it. You can also delete a job manually at any time from your dashboard.
Read our full privacy policy for retention timelines and our list of subprocessors.