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Free local audio converter — no uploads

WAV to M4A Converter — Free, Local, No Upload

The short answer: WAV files are raw PCM — studio-grade fidelity at a punishing size. Converting WAV to M4A re-encodes that audio as AAC inside an MP4 container, typically shrinking a recording to a tenth of its bytes while keeping quality most listeners call transparent. It is the natural step when a master WAV needs to fit a phone, an iTunes-style library, or a web page that accepts M4A but not WAV.

How to convert WAV to M4A

Convert WAV to M4A now

The button opens the Audio Converter with WAV → M4A preselected — it runs entirely in your browser and nothing is uploaded.

Open Audio Converter

Local in your browser — nothing is uploaded

  1. Open the converter

    The button above opens the Audio Converter with the M4A output already selected.

  2. Drop your WAV file

    Add the file (up to 200.0 MiB); the format is verified from its signature, not its name.

  3. Convert and download

    Press Convert; the ffmpeg audio engine (~31 MB) downloads on first use, then your file transcodes in a dedicated worker. Cancel stops the run cleanly.

Conversion facts

Input format
WAV
Output format
M4A
Max file size
200.0 MiB
Max output
200.0 MiB
Quality
Lossy — 96–192 kbps in three tiers
Processing
Local in your browser — nothing is uploaded

WAV

WAV → M4A

What to watch

AAC is lossy: the converter decodes the WAV and re-encodes with the native AAC encoder at 96/128/192 kbps, so detail below the chosen tier is gone — archive the WAV if you may need it again. AAC is more efficient than MP3, so the same tier sounds a touch cleaner per kilobit. Sample rate and channel count pass through untouched. Inputs are capped at 200 MiB and outputs at 200 MiB, with a 5-minute per-run watchdog; the ~31 MB engine downloads on first use, then stays cached on your device.

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  • The tool behind this page

    Audio Converter

    Convert MP3, WAV, M4A, OGG and FLAC audio between formats entirely in the browser with ffmpeg.wasm — no uploads. Inputs up to 200 MB with 96/128/192 kbps bitrate tiers for lossy output; OGG uses Opus and WAV/FLAC stay lossless.

Frequently asked questions

Will converting WAV to M4A reduce audio quality?
Yes, in the same way any lossy encode does: the AAC encoder keeps what the chosen bitrate allows and discards the rest. Because the source WAV is pristine, the M4A is a first-generation encode — at Balanced 128 or Quality 192 kbps it is audibly transparent for most music and speech on most playback systems.
Which bitrate should I choose for the M4A?
Three tiers are offered: Compact 96, Balanced 128, and Quality 192 kbps. AAC reaches transparent quality a step earlier than MP3, so Balanced 128 is enough for most material; choose Quality 192 for dense or critical music, and Compact 96 for long voice recordings where size matters most.
Are my audio files uploaded anywhere?
No. Decoding and encoding run in a WebAssembly build of ffmpeg inside your browser tab — the file never leaves your device, nothing is uploaded or stored on a server, and closing the tab discards everything.