17 March 2026 | 6 min read
How to choose an audio file converter you can trust
There are hundreds of audio converters. Very few tell you what they did to your file, and fewer still keep it off their servers.
Converting audio looks trivial until a delivery gets rejected. The difference between converters is not the list of supported formats, it is what happens to sample rate, bit depth, channel order, metadata and confidentiality along the way.
Does it upload your files?
Most free converters send your audio to a server. For unreleased music, casting tapes or production sound under NDA, that alone disqualifies them. Browser-based tools using WebAssembly and the Web Audio API can decode and encode locally, so the file never leaves your machine.
Does it tell you what it changed?
- Source and output sample rate, shown before you export.
- Bit depth, including whether 32 bit float was truncated.
- Channel count and layout, so a 5.1 file is not silently summed.
- Whether timecode and BWF metadata survived.
Does it respect channel layouts?
A converter that treats an eight channel poly WAV as generic audio will interleave, sum or reorder channels. For production sound this is destructive: the boom ends up in the wrong stem and nobody notices until the mix.
Does it handle the formats you actually get?
In practice that means WAV, BWF, AIFF, MP3, M4A, FLAC, OGG and Opus in, and WAV, AIFF and MP3 out, at the sample rates and bit depths your delivery spec asks for. Anything narrower means a second tool in the chain.
Our take
This toolkit processes everything in the browser, shows the technical readout before export, keeps track names from iXML and BWF metadata, and lets you pick sample rate, bit depth and format per export. Your first conversion is free.