MP3 or WAV for video export?

Updated 17 August 2026

What the visualizer actually reads

Both formats are decoded to the same thing before anything is drawn: raw floating-point samples. A WAV stores those samples directly; an MP3 stores a compressed approximation that the decoder reconstructs. By the time the analyser runs its FFT, it is looking at a plain array of numbers either way. There is no format-specific code path and no difference in how the two are processed.

Where compression is visible

MP3 encoding discards high-frequency content that is hard to hear, and it discards more of it at lower bitrates. A spectrum display maps those frequencies to its rightmost bands, so a heavily compressed file can show noticeably less activity at the top of the range. In practice this only becomes visible below roughly 128 kbps. At 192 kbps and above, the difference against a WAV of the same track is not something you can pick out on a 30-second clip.

A waveform display is even less sensitive, because it plots amplitude over time rather than frequency content. Compression barely touches the overall envelope, which is what the waveform draws.

The re-encode nobody mentions

Whatever you export, Instagram, TikTok and YouTube re-encode it on upload to their own settings. Your carefully preserved lossless source becomes their compressed delivery copy before a single viewer sees it. This is the step that dominates final quality, and it is entirely outside your control — which is why agonising over the source format is rarely a good use of attention.

Practical advice

Use whatever you already have. If you are exporting from a DAW and choosing, WAV is marginally the safer source and avoids a generation of compression. If your only copy is a 192 kbps MP3, use it and do not think about it further. The one case worth avoiding is a low-bitrate MP3 that has already been converted several times, where the accumulated artefacts can show up as a dull, lifeless top end in a spectrum visualisation.

A note on file size

WAV is roughly ten times the size of an equivalent MP3 on disk. It is tempting to conclude that WAV is therefore much heavier on a browser-based tool, but that is mostly wrong: both formats are decoded to identical uncompressed samples before rendering, so the large buffer held in memory is the same size either way. The only real difference is the source file itself — about 40 MB for a half-hour MP3 against roughly 300 MB for the same material as WAV.

That difference is not nothing, but it is a fraction of the decoded audio, which is what actually determines whether a long render completes. Choose MP3 to save disk space and loading time — not in the expectation that it will rescue a long render that WAV would have failed, because for the most part it will not.