Online Video Converter
Free online video converter. Convert video and audio files directly in your browser using WebAssembly. No upload, no server — 100% client-side.
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Getting started0 of 4
1
Upload a file
Pick a video or audio file
2
Pick output format
MP4 is selected by default
3
Hit Convert
Runs entirely in your browser
4
Download result
Save the converted file
Choose a video or audio file
Supported inputs: .mp4, .m4v, .webm, .avi, .mov, .mkv, .flv, .ogv, .ogg, .mpeg, .mpg, .wmv, .3gp, .ts, .gif, .mp3, .wav, .m4a, .aac, .opus, .flac, .wma
Warning: Video conversion is heavy. Keep this tab open and expect high CPU usage.
Output format
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Mobile inline (between input and results)
Conversion logs
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Supported formats
MP4WebMMOVMKVAVIOGVGIFMP3WAVOGGFLACAACM4AWMAFLVMPEGWMV3GP
FAQ
Is my file uploaded to a server?
No. Everything runs locally via FFmpeg WebAssembly.
Why is the first conversion slow?
It downloads the FFmpeg core (~30 MB) once. After that it's cached.
Max file size?
No hard limit. Files over 250 MB may be slow; over 700 MB may freeze the tab.
Can I convert MP4 to MP3?
Yes. Choose "MP3 (audio only)" and click Convert.
Can I make a GIF from a video?
Yes. Select "GIF (animated)" as output format.
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