What Video and Audio Formats Does VidPackit Support?

Updated

VidPackit accepts MP4, WebM, MOV and MKV files as input, and can output video as MP4, WebM, MOV, MKV, M4V or MPEG — or strip the video entirely and export audio as MP3, AAC, WAV, FLAC or OGG. You can also drop the resolution to 720p, 480p or 360p during compression. The catch: it runs entirely in your browser using WebCodecs, so it works best on desktop Chrome or Edge, and the page itself warns that incomplete WebCodecs support can make conversion fail or run much slower.

Input formats

VidPackit reads four container types when you drop a file in:

  • MP4 — the most common format for phone and camera footage
  • WebM — typical for screen recordings and web-sourced clips
  • MOV — standard for iPhone and many mirrorless cameras
  • MKV — common for downloaded or archived video

When you load a file, the tool reports its size, duration, resolution, codec and audio track before you commit to any settings, so you can confirm it parsed the file correctly.

Output formats

Video output

You can keep the result as video in any of six containers:

Container Typical use
MP4 Widest compatibility — phones, social, editing tools
WebM Web embedding, smaller files
MOV Apple ecosystem, further editing
MKV Archival, multiple tracks
M4V iTunes/Apple playback
MPEG Legacy players and older software

Audio-only output

If you only need the soundtrack, you can export audio with no video track in MP3, AAC, WAV, FLAC or OGG. This is useful for pulling a voice memo, interview or music bed out of a clip without carrying the video weight.

Resolution options

Beyond format, you can downscale during compression:

  • Original — keep the source resolution
  • 720p (1280 × 720)
  • 480p (854 × 480)
  • 360p (640 × 360)

Lowering resolution compounds the savings from the quality level, which matters if your goal is a small file rather than a faithful copy.

What to check before you start

The format list is broad, but the browser is the real constraint. VidPackit does all decoding and encoding locally through WebCodecs, and the page states plainly that incomplete WebCodecs support means conversion may fail or be much slower. For the best experience, use the desktop version of Chrome or Edge.

Two practical implications:

  1. Test with one file first. If your browser can't decode the input codec, the job fails regardless of the container being "supported."
  2. Expect format support to vary by codec, not just extension. An MP4 using an unusual codec may behave differently from a standard H.264 MP4.

If a conversion fails, try a different browser, or re-export the source from your editing tool into a mainstream codec before compressing.