Format Converter — Fast Container Conversion in Copy Mode
Change what container a file is wrapped in without touching the video and audio inside it. When a conversion only needs a different wrapper, this finishes in seconds and loses nothing, because nothing is re-encoded.
Containers and codecs are different things
This is the distinction that makes most format confusion evaporate. MP4, MKV and MOV are containers — boxes that hold streams. H.264, HEVC and AAC are codecs — how the streams inside are actually encoded. Two files can both be MP4 and hold entirely different codecs, and the same H.264 video can sit inside any of the three containers unchanged.
When copy mode applies
If the codecs inside your file are already supported by the target container, converting is just repackaging: the streams are copied across untouched. That is why an MKV holding H.264 becomes an MP4 almost instantly and with no quality loss. If the codec is not supported by the destination, a real re-encode is required, which takes time and costs quality.
- MKV to MP4 with H.264 inside — instant copy, no quality loss
- MOV to MP4 from most cameras — usually a straight copy
- Anything needing a codec change — a genuine re-encode
How to use it
- Load your file. Open the Format Converter and select your audio or video file.
- Choose the target container. Pick the format you need. Copy mode is used automatically when the codecs allow it.
- Convert and download. The converted file saves straight to your device.
Frequently asked questions
Why is this so much faster than a normal converter?
When the codecs are already compatible with the target container, the streams are copied rather than re-encoded. No decoding or compression work happens at all.
Does copy mode reduce quality?
No. The original encoded data is preserved exactly — only the container around it changes.
What is the difference between this and the video converter?
This tool prioritises fast container changes. The video converter handles full transcodes when the codec itself has to change.
Related tools
- Video Compressor — Shrink video file size locally with FFmpeg — no upload, no watermark.
- Audio Extractor — Pull the audio track from any video and save it as MP3 or WAV.