Free · no signup · browser-local
Audio Converter: WAV, MP3 and Opus
Convert supported local audio to a real WAV, MP3 or Opus file with explicit bitrate, sample rate and channels.
Local audio · no uploads, accounts or saved inputs
Source audio
Editable sample: 12 seconds from the 2009 U.S. inaugural address, marked public domain under U.S. law. Source and license · Steve Jobs at Stanford ↗ · Jensen Huang speeches ↗
Up to 5 mono/stereo files for joining · 512.00 MiB each / 1024.00 MiB total · 4 hours combined. Long sources load metadata and sparse preview windows; processing decodes only the selected range.
Output settings
MP3 uses the local WASM encoder. Lossy re-encoding can reduce quality.
MP3 is selected by default and uses the local WASM encoder. Output supports up to 4 hours, 48 kHz and two channels within storage limits. WAV/Opus can stream; MP3, pitch preservation and crossfade require a selected range that fits the PCM working budget.
Preview and download
Prepare audio to hear the actual exported file. Changing files or settings clears the previous result.
Getting started
Load a local file, choose a supported output and audio settings, then convert and listen to the download preview.
Before you use the result
Device-aware local processing: sources up to 128 MiB–1 GiB each and 2–8 hours combined depending on the reported device budget. Long supported WAV/Opus jobs stream in chunks; other formats/effect combinations use a checked PCM/WASM budget. Native codecs and temporary browser storage vary. Lossy formats may add padding.
Try an example
Convert a stereo sample to a 24 kHz mono WAV; use MP3 when a compressed file is needed.
How it works
Local metadata and bounded waveform sampling are loaded first. Small selections use checked PCM processing; supported long WAV/Opus operations decode and write in chunks, with two-pass peak normalization. MP3, pitch preservation and crossfade must fit their PCM/WASM budget. Large results can use local temporary browser storage. Input files are not uploaded.
Frequently asked questions
Convert supported local audio to a real WAV, MP3 or Opus file with explicit bitrate, sample rate and channels.
How do I use Audio Converter: WAV, MP3 and Opus?
Load a local file, choose a supported output and audio settings, then convert and listen to the download preview.
Does this tool upload my data?
Inputs and files are processed in your browser. Page-view analytics do not contain your tool input.
What should I check before using the result?
Device-aware local processing: sources up to 128 MiB–1 GiB each and 2–8 hours combined depending on the reported device budget. Long supported WAV/Opus jobs stream in chunks; other formats/effect combinations use a checked PCM/WASM budget. Native codecs and temporary browser storage vary. Lossy formats may add padding.