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
Online Video & Audio Converter
Local · No uploadsConvert between video formats (MP4, MKV, MOV, WebM) and audio formats (MP3, AAC, WAV, FLAC) right in your browser. The tool automatically detects media type and only offers same-type targets, so you never end up with an invalid conversion. Customize the encoder, bitrate, or frame rate when you need finer control. Files are converted locally — nothing is uploaded.
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.
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.