How do I convert AMR to AU?

Drop your AMR file onto the converter above, make sure AU is selected, and click Convert. When it's done, download the AU file — it usually takes a few seconds.

Is it safe to convert AMR to AU here?

Yes. AMR to AU conversion happens entirely inside your browser using WebAssembly, so your file is never uploaded to any server.

Is the AMR to AU converter free?

Yes — free with no watermark. Signed-out visitors can convert 25 files a day, and a free account raises that to 250.

Will converting AMR to AU reduce quality?

No — AU preserves the content of your AMR file as faithfully as the format allows.

Can I convert multiple AMR files at once?

Yes. Add up to 5 files at a time without an account, 10 with a free account and up to 500 on paid plans, then download them individually or as a single ZIP.

Can I convert AU back to AMR?

Yes — use our AU to AMR converter. Note that converting back and forth between formats can't recover detail lost to lossy compression.

AU→AMR AMR→MP3 MP3→AU AMR→WAV MP4→AU AMR→M4A WAV→AU AMR→FLAC MOV→AU AMR→AAC M4A→AU AMR→OGG AMR→Opus AMR→WMA AMR→AIFF AMR→M4B AMR→AC3 AMR→MP2 AMR→WEBA AMR→OGA AMR→MKA AMR→WV AMR→TTA WebM→AU FLAC→AU MKV→AU AAC→AU AVI→AU OGG→AU WMV→AU Opus→AU WMA→AU FLV→AU M4V→AU MPEG→AU 3GP→AU AIFF→AU MPG→AU TS→AU M4B→AU MTS→AU VOB→AU PNG→JPG JPG→PNG PNG→WebP JPG→WebP WebP→PNG WebP→JPG HEIC→PNG HEIC→JPG MP4→MP3 PNG→JPEG JPG→JPEG JPEG→PNG JPEG→JPG PNG→PDF JPG→PDF PDF→PNG PDF→JPG HEIC→WebP MP4→WebP PDF→DOCX DOCX→PDF JPEG→WebP WebP→JPEG PNG→GIF JPG→GIF GIF→PNG GIF→JPG MP4→MOV MOV→MP4 WebP→PDF HEIC→JPEG WebP→GIF GIF→WebP HEIC→PDF MP3→WAV WAV→MP3 JPEG→PDF PDF→JPEG SVG→PNG SVG→JPG HEIC→GIF MOV→MP3 MP4→GIF GIF→MP4 JPEG→GIF GIF→JPEG PNG→AVIF JPG→AVIF AVIF→PNG AVIF→JPG MP3→M4A M4A→MP3 GIF→PDF SVG→PDF PNG→SVG JPG→SVG PDF→SVG SVG→WebP MOV→WebP MP4→WAV MP4→WebM WebM→MP4 WebP→AVIF AVIF→WebP WebP→SVG SVG→JPEG MP4→MKV MKV→MP4 HEIC→AVIF MP4→M4A JPEG→AVIF AVIF→JPEG JPEG→SVG MOV→GIF GIF→MOV WebM→MP3 AVIF→PDF MP3→FLAC FLAC→MP3 MP4→AVI AVI→MP4 MKV→MP3 GIF→AVIF AVIF→GIF SVG→GIF GIF→SVG WebM→WebP MOV→WAV XLSX→PDF CSV→PDF EPUB→PDF PDF→EPUB MOV→WebM WebM→MOV MKV→WebP PNG→ICO JPG→ICO ICO→PNG ICO→JPG MP3→AAC WAV→M4A AAC→MP3 M4A→WAV MP4→FLAC AVI→MP3 MOV→MKV MKV→MOV MOV→M4A DOCX→EPUB EPUB→DOCX CSV→DOCX PDF→TXT DOC→PDF TXT→PDF WebP→ICO ICO→WebP PPTX→PDF AVI→WebP

AMRAU

Convert AMR to AU

Free, fast and private. Your AMR files are converted right in your browser — nothing is uploaded.

Runs in your browser
No watermark
Batch & ZIP download

How to convert AMR to AU

1
Add your AMR files
Drag and drop AMR files onto the converter, paste them, or click to browse. You can add several at once.
2
Choose AU
AU is already selected. Open Options if you want to change quality, size or metadata.
3
Convert
Click Convert. Your files are converted right in your browser in seconds.
4
Download your AU
Download each AU file, or everything at once as a ZIP.

AMR vs AU

From

AMR · Adaptive Multi-Rate

AMR is a speech codec used by mobile phones for voice recordings and calls.

Type: Audio
Extension: .amr
MIME: audio/amr
Best for: voice recordings from older phones

Lossy compressionLegacy format

All AMR conversions →

AU · Sun Audio

AU is a simple audio format introduced by Sun Microsystems, common on early Unix systems and Java.

Type: Audio
Extension: .au
MIME: audio/basic
Best for: legacy Unix and Java applications

Legacy format

All AU conversions →

Need it the other way around? Convert AU to AMR.

Related conversions

AMR to AU: frequently asked questions

Free, private and in your browser

Convert AMR to AU in seconds.

No sign-up, no watermarks, no waiting in line. Drop a file and get it back in the format you need.

Convert a file Explore the API

Most conversions never leave your device
Cloud files deleted automatically
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Convert AMR to AU

How to convert AMR to AU

Add your AMR files

Choose AU

Convert

Download your AU