How to do it, step by step
- Select the video.
- Choose the output format and leave the Quality on Auto.
- Click Convert video: if the codec is compatible, the result comes out in a few seconds.
- Compare size and picture in the two players and download.
When this is useful
Compatibility between devices and programs
Swap MOV, MKV or TS for MP4 without touching the picture.
Archive without new compression
Keep the original quality when changing the container.
Tips for a good result
- MP4, MOV and MKV in this tool use H.264 and AAC: videos in that standard are the ones that benefit from direct copying.
- If the conversion time is long, it is a sign the video was re-encoded.
What this tool does not do
- When the file’s codec differs from what the format requires (such as HEVC to MP4 or any video to WebM), the app re-encodes and there is some loss.
- The High, Medium and Compact options always re-encode.
- The app does not show whether there was direct copying or re-encoding: the time is the best indicator.
- The new file carries the “WebFaz.com” credit in the metadata (comment and artist).
Frequently asked questions
- How do I know whether it lost quality?
- Compare the size: a direct copy ends up almost the same size as the original. If the file changed size a lot, there was re-encoding.
- Can I convert to WebM losslessly?
- No. WebM uses other codecs, so the video is always re-encoded.
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Text written by Marcelo Amantino · updated October 18, 2026 · who we are