Change audio sample rate
Resample a file to 44.1 kHz, 48 kHz or lower, for software that wants a specific rate.
Drop a file to start
Runs in your browser. Nothing is uploaded.
Sample rate is how many times a second the audio was measured, and mismatches between rates are behind a surprising number of import errors. Video work runs at 48 kHz, CDs and most music at 44.1 kHz, telephony and speech tools often at 16 kHz or 8 kHz, and software that wants one and is handed another usually refuses rather than converting.
Resampling is arithmetic on the samples, and it is the accurate kind: the audio is decoded, rebuilt at the new rate, and re-encoded. The length is unchanged — a two-minute file is still two minutes — which is what separates resampling from the naive trick of relabelling the header, where the pitch and speed shift instead.
Going down loses the top of the frequency range, and that is fine when the destination genuinely wants a lower rate: a 16 kHz file for a speech model is not a broken file, it is the file that model expects. Going up gains nothing that was not recorded, but sometimes satisfies software that insists.
Step by step
- 1Drop in the files.
- 2Pick the sample rate you need.
- 3Press Convert, then download.
Questions
44.1 or 48 kHz?
48 kHz for anything going into video, 44.1 kHz for music. Matching whatever the rest of the project uses matters more than the choice itself.
Does resampling change the pitch?
No. The audio is properly rebuilt at the new rate, so the length and the pitch stay put.
Is going to a higher rate worth it?
It adds no detail — nothing above the original limit was ever recorded. Do it only when something downstream demands a specific rate.