Format Converter
Convert between video and audio formats. Available formats adapt to the file type, with optional custom encoding settings.
$Drag in a video or audio file, or click to select
Video and audio are processed only in your browser memory
Files are read into browser memory — nothing is uploaded
Pick the output format and processing options
The engine processes everything locally and exports the result
Convert Video & Audio Formats Online
Local · No uploadsConvert MOV, MKV, AVI, or WebM video to MP4, or switch audio between MP3, AAC, WAV, FLAC, OGG, and WMA. The tool detects the file type and only offers compatible targets, so you never end up with an invalid conversion. Set the encoder, bitrate, frame rate, or resolution when you need finer control. Files are converted locally — nothing is uploaded.
Quick Answers
- Video: MP4 / MKV / MOV / AVI / WebM input, converted to MP4 / MKV / MOV / AVI / GIF / FLV / WMV output (WebM is input-only). Audio: between MP3 / AAC / WAV / FLAC. Default output is MP4 (H.264 + AAC) — playable on phones, TVs, and every browser.
- A video file = container (MP4/MKV/MOV) + codec (H.264/H.265/VP9). Most "format not supported" errors are codec problems — swapping the container alone won't fix them; re-encoding will.
- Remuxing (-c copy) swaps only the container: lossless and near-instant, but the codec must already be supported by the target container. Re-encoding is universally compatible but slower and lossy.
- Conversion runs in your browser via FFmpeg WASM (same engine as command-line FFmpeg). Files never upload, and the tool is free with no sign-up.
How to Convert Media Formats
- 1
Upload your video or audio file
- 2
Pick a target format of the same type — audio to audio, video to video
- 3
Optionally configure the encoder, bitrate, frame rate, and other advanced settings
- 4
Click Convert, then download the converted file
Common Uses
- Fix "won't play" issues by converting to a format your device supports
- Meet platform requirements (some sites only accept MP4)
- Standardize files from different sources for easier management
Things to Keep in Mind
- Conversion re-encodes the media (a lossy process) — repeated conversions accumulate quality loss
- Audio and video can't be converted into each other here; to pull audio from a video, use the Audio Extractor
- Large files take longer and are limited by browser memory
How to Choose a Format Converter
- vs. desktop converters like Format Factory or HandBrake: no installation, works across platforms
- vs. upload-based online converters: your files never leave your device
- Automatically constrains output choices by input type, preventing pointless conversions
Containers vs. Codecs
- A video file = container + codec: MP4 / MKV / MOV are containers (they package the streams), while H.264 / H.265 / VP9 are codecs (they compress the picture). Many "format not supported" errors are actually the codec being unsupported — swapping the container alone won't fix that.
- There are two paths: remuxing (-c copy) only swaps the container without re-compressing — extremely fast and lossless, but the codec must already be supported by the target container. Re-encoding re-compresses — universally compatible, but slower and lossy.
- This tool re-encodes to MP4 (H.264 + AAC) by default, the most widely compatible combination — it plays on phones, TVs, and every browser.
Format Conversion FAQ
Does converting lose quality?
With default encoding settings, output is close to the source. You can control the quality-versus-size tradeoff with the bitrate setting.
How do I convert MOV to MP4?
Open the converter, drop in the MOV file, choose MP4 as the output, then click Convert. The default MP4 preset uses H.264 video and AAC audio for broad device compatibility.
Can I convert MKV or WebM to MP4?
Yes. The page accepts MKV, WebM, MOV, AVI, and other common video containers and can re-encode them to MP4. WebM is available as an input format, not an output format.
Which formats can I convert between?
Video: MP4 / AVI / MKV / MOV / WebM and more. Audio: MP3 / AAC / WAV / FLAC and more — same-type conversions only.
Can I convert a video directly into an audio file?
Not on this page. To extract audio from a video, use the Audio Extractor tool — it's built for that.
Will the converted video play everywhere?
The default output is MP4 (H.264), which plays on virtually every device and player.
Can I convert MKV to MP4?
Yes. Upload the MKV, choose MP4 as the target, and convert — ideal when you need playback on phones or TVs.