VoxCaption
Container vs. codec — the quick version
A format like MP4 or MKV is a container (the box), while H.264 or H.265 is the codec (how the video is compressed). Changing only the container is fast and lossless; re-encoding to a new codec is where quality settings matter. VoxCaption handles both and defaults to high-quality presets.
Supported formats
- Video: MP4, MKV, AVI, MOV, WebM, FLV, WMV, MPEG, 3GP, TS.
- Audio extraction: pull a clean MP3/audio track out of any video.
Step by step
- Open the Converter tab and choose Video to Video (or Extract Audio).
- Drag in your file(s) — batch conversion is supported.
- Pick the output format, resolution and quality. Leave resolution at "Original" to avoid resizing.
- Press Start. The converted file is saved to your output folder.
Everything runs 100% offline — no file size caps, no watermarks, and your videos never leave your PC.
Tips
- Converting to MP4 (H.264) gives the widest device and platform compatibility.
- Use "High" quality for archive copies; lower it only when you need a smaller file.
- Enable GPU for faster re-encoding on supported NVIDIA cards.
FAQ
Will converting shrink my file?
It depends on the target codec and quality. Same-codec container changes keep size and quality nearly identical.
Can I just grab the audio?
Yes — switch to Extract Audio to save the soundtrack as an audio file.
Convert your first video free
Try the Video Converter in VoxCaption Studio — 14-day free trial.
Related Articles
Further reading: learn more about the MP4 container format (external).