Convert AMR to AU
Free online AMR to AU converter. No signup required.
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Max file size: 100 MB
When to convert AMR to AU
Use this conversion when your destination needs AU and you have a AMR source. Keep the original so you can compare the result or try another supported format.
Audio is decoded and re-encoded using format-specific defaults. Sample format and some metadata may change. Embedded cover art is omitted. A lossless destination cannot recover detail lost in the source.
AMR vs AU: Format Comparison
Side-by-side comparison of the source and target formats.
| Property | AMR (Source) | AU (Target) |
|---|---|---|
| Extension | .amr | .au |
| Full Name | AMR Audio | Sun AU Audio |
| Compression | Varies | Varies |
| File Size | Small | Varies |
| Best For | Mobile phone voice recording and voice memos | Unix and Solaris system audio and sound effects |
| Browser Support | Varies | Varies |
How to Convert AMR to AU
Follow these simple steps to convert your file in seconds.
Choose a AMR file
Select or drop one file up to 100 MB. Its extension must match this converter. Availability is checked before transfer.
Convert to AU
Audio is decoded and re-encoded using format-specific defaults. Sample format and some metadata may change. Embedded cover art is omitted. A lossless destination cannot recover detail lost in the source.
Download and check the result
Use Download after conversion completes. Open the result and check its content, quality and formatting before sharing it. Download links expire one hour after upload finishes. Uploaded and converted files are removed automatically by regular cleanup. Files may become unavailable sooner when the service restarts.
Tips for Converting AMR to AU
Practical advice to get the best results from this conversion.
Why this conversion is worth doing
AMR Audio has a known limitation: very poor quality for music or non-speech audio. Sun AU Audio addresses this with a key advantage: simple, well-documented format with a minimal header. Converting from AMR to AU is most worthwhile when this specific trade-off matters for the way you intend to use the file.
Match the format to the actual workflow
AMR Audio is most commonly used for mobile phone voice recording and voice memos, while Sun AU Audio is the standard for unix and solaris system audio and sound effects. If your workflow is closer to the second pattern, converting makes sense. If you are still working in a context where AMR is the norm, converting may create unnecessary compatibility friction with collaborators or tools that expect the source format.
Watch for this limitation in the AU output
Sun AU Audio has its own limitation worth understanding before you commit: largely obsolete for general-purpose audio use. After the conversion completes, open the AU file and verify that this limitation does not affect your specific use case — for some workflows it is irrelevant; for others it can be a deal-breaker.
Understand lossy vs. lossless before converting
Converting from a lossy format like MP3 to a lossless format like FLAC or WAV does not restore lost audio data — it only changes the container. If you need true lossless quality, always start from an uncompressed or lossless source. Converting lossless to lossy, however, is a valid way to reduce file size for streaming or mobile playback.
Understanding AMR and AU Formats
Learn about the source and target file formats to understand what happens during conversion.
Source Format
AMR Audio
audio/amrAMR (Adaptive Multi-Rate) is a compressed audio format optimized specifically for speech encoding, widely used in mobile telecommunications. It employs adaptive bitrate encoding that adjusts between 4.75 and 12.2 kbps based on network conditions, prioritizing speech intelligibility over music quality. AMR is the standard speech codec for GSM and UMTS mobile networks worldwide.
Advantages
- Extremely small file sizes optimized for voice content
- Adaptive bitrate adjusts to network conditions in real-time
- Standard codec in GSM/3G mobile networks worldwide
Limitations
- Very poor quality for music or non-speech audio
- Limited to narrowband (8 kHz) or wideband (16 kHz) sampling
- Not suitable for high-fidelity audio or media production
Common Uses
- Mobile phone voice recording and voice memos
- Cellular voice call encoding in GSM/3G networks
- MMS voice message attachments
Target Format
Sun AU Audio
audio/basicAU is an audio file format introduced by Sun Microsystems and commonly associated with Unix and NeXT systems. It supports various encodings including uncompressed PCM, mu-law, and A-law compression, with a simple header structure. AU was one of the earliest audio formats supported on the web and remains used in Unix-based audio programming.
Advantages
- Simple, well-documented format with a minimal header
- Native support in Unix, Solaris, and Java audio APIs
- Supports multiple encoding types including mu-law for telephony
Limitations
- Largely obsolete for general-purpose audio use
- Limited metadata support and no modern compression options
- Poor support in consumer audio software and devices
Common Uses
- Unix and Solaris system audio and sound effects
- Java application audio playback (javax.sound)
- Legacy telephony and voice processing systems
Frequently Asked Questions
Common questions about converting AMR to AU.
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