AMR to MP3 Converter

How to Convert AMR to MP3 Online

1. Upload Your AMR Files: Drag and drop or click "Add Files" to select AMR recordings from your computer. Old Android voice memos, dumbphone voicemails, MMS audio attachments, WhatsApp voice messages from pre-2018 Android, and call recordings exported by ACR, Cube Call Recorder, or Boldbeast are all accepted. Both AMR-NB (.amr) and AMR-WB (.awb) work. Batch upload is supported.
2. Pick the MP3 Bitrate: Default is 128 kbps (constant) — the standard for spoken-word audio that plays cleanly on every device. Choose 64 kbps or 96 kbps for tiny voicemail archives where size matters more than fidelity, 192 kbps if your AMR-WB source has any music or background ambience worth preserving, or 320 kbps for archival masters. Switch to Variable Bitrate (VBR) for smaller files at the same perceived quality, or set a target file size in KB/MB and let the encoder pick the bitrate.
3. Set Sample Rate and Channels (Optional): AMR-NB is 8 kHz and AMR-WB is 16 kHz. Pick "Original" to keep the source rate (smallest output, fastest encode), or upsample to 44.1 kHz for car stereos and CD-style players, or 48 kHz for video/podcast workflows. Pick mono (recommended for speech — half the file size) or stereo. Trim the recording with start time and duration in HH:MM:SS.sss format if you want to cut silence or isolate a specific clip.
4. Convert and Download: Click Convert. Files process on our servers and download individually or as a ZIP — no sign-up, no watermark, no sign-up.

Why Convert AMR to MP3?

AMR (Adaptive Multi-Rate) is a speech-optimized codec built by Ericsson and adopted by 3GPP for GSM/UMTS mobile networks. It compresses voice down to 4.75-12.2 kbps for narrowband (AMR-NB at 8 kHz) or 6.6-23.85 kbps for wideband (AMR-WB at 16 kHz) — extraordinarily small, but unsupported by most consumer audio players, car head units, Bluetooth speakers, and messaging apps. MP3 is the universal lossy audio format that every device since 1995 plays natively. Common reasons to convert AMR → MP3:

• Playing voicemails on car stereos and Bluetooth speakers — most aftermarket head units, factory infotainment systems (Ford SYNC, Toyota Entune, BMW iDrive), and Bluetooth speakers refuse to play.amr but happily stream.mp3 from a USB stick or phone. Converting unlocks playback in the car.
• Sharing voice messages over email, Slack, or WhatsApp — Gmail, Outlook, Slack, and Discord preview MP3 inline with a play button. AMR uploads as a generic attachment that recipients can't preview without downloading and installing VLC. MP3 works everywhere.
• Archiving years-old Android voice memos and call recordings — Samsung Galaxy, HTC, LG, and pre-2018 Android Voice Recorder defaulted to.amr. Converting to MP3 future-proofs the archive against AMR decoder deprecation (modern Android Auto, iOS, and many media players have already dropped AMR support).
• Importing voice notes into podcasting and video editing tools — Audacity, GarageBand, Adobe Audition, Premiere Pro, DaVinci Resolve, and Descript all accept MP3 natively. AMR support is patchy and often requires extra codec packs or fails silently.
• Uploading to transcription and AI services — OpenAI Whisper, Otter.ai, Rev, and Sonix all reliably accept MP3. AMR support is hit-or-miss across speech-to-text APIs, particularly for AMR-WB. Converting first removes the gamble.
• Reducing storage clutter without losing voice intelligibility — a 60-second AMR voicemail is about 55 KB, and a 64 kbps mono MP3 of the same clip is around 480 KB. The MP3 is bigger but still tiny by modern standards, and it plays anywhere — a worthwhile tradeoff for a permanent personal archive.

See also AMR to WAV for editing-grade output, or M4A to MP3 and WMA to MP3 if your archive mixes formats.

AMR vs MP3 — Format Comparison

MP3 Bitrate Quick Guide for AMR-Sourced Audio

Frequently Asked Questions

Will converting AMR to MP3 make my voice recording sound better?

No. AMR is a lossy speech codec — once audio is encoded as AMR, frequencies above 3.4 kHz (narrowband) or 7 kHz (wideband) are gone, and the speech-coded waveform is a parametric reconstruction rather than a faithful sample stream. Converting to MP3 wraps that reconstruction in a more universal container but cannot add detail that AMR threw away. The benefit is universal playback — your converted MP3 will play on every car stereo, Bluetooth speaker, and music app, where the original AMR couldn't.

What bitrate should I pick for an AMR voicemail?

For pure voice from AMR-NB (8 kHz, narrowband), 64 kbps mono MP3 is enough — it preserves every frequency the source captured, and you can't make it sound better by encoding higher. For AMR-WB (16 kHz, wideband — used for HD voice and VoLTE), bump to 96-128 kbps mono. If the recording has background music, ambient noise, or multiple speakers worth keeping clean, use 128-192 kbps. Going above 192 kbps for AMR-sourced audio is wasted bits.

Should I keep the file mono or make it stereo?

Keep it mono. AMR is always single-channel; "converting" to stereo just duplicates the same channel into both ears, doubling the file size with zero quality benefit. Mono MP3 plays correctly on stereo speakers and headphones automatically. Use stereo only if you plan to mix the voice into a stereo podcast or layer additional audio on top later.

Why is my MP3 so much larger than the AMR?

AMR uses speech-coding tricks (storing parameters of the human vocal tract per frame) to hit 6-12 kbps. MP3 uses general-purpose perceptual coding and bottoms out around 32-64 kbps for usable quality. A 60-second AMR file at 7.4 kbps is about 55 KB; the same 60 seconds as 128 kbps MP3 is about 960 KB — roughly 17× larger. This is the price of universal compatibility, and it's still small enough that storage isn't a real concern.

Does this work for both AMR-NB and AMR-WB (.awb) files?

Yes. The decoder handles AMR-NB (8 kHz, used by most pre-2018 Android phones and MMS) and AMR-WB (16 kHz, sometimes saved as.awb, used in HD voice / VoLTE recordings). XConvert detects the codec automatically from the file header — no need to specify which variant you're uploading.

Can I batch convert a folder of old voicemails at once?

Yes. Drop in dozens or hundreds of.amr files at once. Each file converts in parallel withon our servers and downloads as individual MP3s or a single ZIP. This is the fastest way to clear out a years-old call recording archive from a Samsung Galaxy S5 era phone or an Android backup folder.

Will the MP3 play on my old car stereo?

Almost certainly yes. MP3 has been the universal car audio format since the early 2000s — every CD-MP3 deck from 2003 onward and every Bluetooth/USB head unit reads it. Use 128 kbps CBR (constant bitrate) for maximum compatibility with the oldest car decks; some early MP3 head units don't handle VBR cleanly. For Apple CarPlay and Android Auto, anything works.

Can I trim a long call recording before saving it as MP3?

Yes. Use the trim section to enter a start time and duration. Both accept seconds (12.5) or HH:MM:SS.sss format (00:01:30.500). Useful for cutting one statement out of a long call recording, removing the automated voicemail greeting from the start, or chopping a multi-hour meeting AMR into shareable MP3 clips before sending.

Is the conversion lossless from a quality standpoint?

No conversion between two lossy codecs is bit-exact, but the perceptual loss is minimal at sane bitrates because AMR has already discarded most of the audio signal — there's not much detail left for MP3 to lose. At 128 kbps or higher, the MP3 sounds indistinguishable from the AMR played in VLC. If you need a true lossless intermediate for editing, convert to WAV instead and only encode to MP3 once after you're done editing.