AMR to MP3 Converter - Convert Old Voice Memos Locally

Convert legacy AMR (.amr) voice memos to MP3 format locally in your browser. Bypasses cloud uploads to guarantee complete privacy for your voice recordings.

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Drop audio or video files here

Supports M4A, FLAC, WMA, MP4, MOV, etc. 100% local processing, no size limits.

Add audio or video files to begin.

Processing runs securely in your local browser sandbox. No server uploads.

Conversion Queue

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Your files will appear here.

How to Use

  1. Upload AMR: Choose or drag your .amr file into the conversion target box.
  2. Format Preset: The export target format defaults to MP3.
  3. Trigger Conversion: Click the convert button to run the in-browser compiler.
  4. Download Audio: Click download to save the MP3 audio file.

Core Features

  • Confidential Voice Guard: Voice recordings contain sensitive personal or business information. Bypassing cloud server uploads ensures absolute privacy.
  • Legacy Device Compatibility: Instantly converts highly compressed AMR voice files from older mobile devices to standard media files.
  • Sub-Second Processing: Bypasses network traffic queues. Computes frame decoding in milliseconds on your local CPU.
  • Unlimited & Free: Free to use with no daily size restrictions or account requirements.

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Calculation Logic

AMR (Adaptive Multi-Rate) is a lossy voice codec optimized for speech coding, widely used in early GSM smartphones. Due to its narrow frequency band, it is not suitable for high-fidelity audio, and modern desktop media players often lack the codecs to parse it.

Our client-side tool utilizes WebAssembly compiled libraries to parse the legacy AMR wrapper, decodes the narrowband speech frames, and packages them into standard MP3 audio streams.

FAQ

Why won't my computer play .amr files?

AMR is a legacy format and is unsupported by modern OS media frameworks. Converting it to MP3 allows you to open it on any device.

Are my recordings safe from exposure?

Yes. Since the transcode executes 100% inside your local browser memory sandbox, no copies of your personal voice data are uploaded or stored online.

Does this tool support WeChat voice exports?

Yes. Most voice notes exported from older messaging apps use the AMR format and can be processed by this tool.