VOC to AMR Converter

How to Convert VOC to AMR Online

1. Upload Your VOC File: Drag and drop, or click "+ Add Files" to select one or more.voc files. Batch uploads are supported, and Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.
2. Pick Bitrate and Audio Codec: AMR encodes only at standardized speech bitrates. Under "Constant Bitrate", pick from AMR-NB modes (4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.2, 12.2 kbps) when the codec is set to AMR Narrow Band, or AMR-WB modes (6.60, 8.85, 12.65, 14.25, 15.85, 18.25, 19.85, 23.05, 23.85 kbps) when set to AMR Wide Band. AMR-NB at 12.2 kbps matches GSM Full-Rate "toll quality"; AMR-WB at 12.65 kbps is the HD Voice baseline.
3. Set Channel, Sample Rate, and Trim (Optional): Audio Channel defaults to MONO (AMR is mono-only). Audio Sample Rate defaults to 8000 Hz for NB; AMR-WB is locked to 16 kHz internally. Use the Trim control to cut to just the speech segment you want — useful for voicemail clips and voice memos.
4. Convert and Download: Click "Convert". Output is a .amr file you can play in VLC, send through MMS, or import into mobile workflows.

Why Convert VOC to AMR?

VOC (Creative Voice File) is a DOS-era container introduced by Creative Technology in 1989 alongside the original Sound Blaster card. It usually wraps uncompressed 8- or 16-bit PCM and is heavy for its content. AMR (Adaptive Multi-Rate) is the inverse: a 3GPP speech codec standardized in October 1999, designed for mobile voice at 4.75–12.2 kbps (AMR-NB) or 6.60–23.85 kbps (AMR-WB). Converting VOC speech to AMR shrinks file size roughly 10–20x while keeping voice intelligible on any phone that handles SMS-era voice messages.

• Voicemail and voice-memo archives — A 60-second VOC recording at 8 kHz/16-bit is roughly 940 KB; the same minute as AMR-NB at 7.4 kbps lands near 55 KB, small enough to drop into MMS, archive at scale, or stash inside SMS-style telephony test rigs.
• Retro DOS speech for modern phones — VOC files extracted from old DOS games, Sound Blaster demos, or Creative WaveStudio sessions become playable on Android (which has had native AMR recording and playback since the platform launched in 2008) and on macOS/iOS via VLC.
• Speech-only podcasting drafts — For interview rough cuts you'll re-encode later, AMR-WB at 23.85 kbps is dramatically smaller than MP3 at 96 kbps and good enough for transcription tools to read accurately.
• Telephony testing and IVR prompts — AMR-NB at 12.2 kbps is the GSM Full-Rate codec used by carriers since the late 1990s. Converting reference VOC prompts to AMR gives you the exact bitstream a 3G handset would receive.
• Bandwidth-constrained playback — For embedded devices, two-way radios, or low-bandwidth field deployments, AMR-NB at 4.75 kbps fits multi-minute voice messages into a few tens of kilobytes.
• HD Voice and VoLTE compatibility checks — AMR-WB (G.722.2) is the codec behind HD Voice on most carriers. Re-encoding VOC samples to AMR-WB at 12.65 kbps lets you preview how a recording will sound after a VoLTE call.

VOC vs AMR — Format Comparison

AMR Bitrate Quick Guide

Frequently Asked Questions

Why is my VOC file so much bigger than the AMR output?

VOC typically stores uncompressed PCM (often 8 kHz, 8-bit mono — about 64 kbps) or ADPCM. AMR runs a speech-tuned ACELP codec at 4.75–23.85 kbps, so the file shrinks roughly 5–15x for the same duration. The trade-off is that AMR throws away anything outside the speech band (200–3400 Hz for NB, 50–7000 Hz for WB) and is mono-only.

Should I pick AMR Narrow Band or AMR Wide Band?

Pick AMR-NB (8 kHz sample rate, 4.75–12.2 kbps) when you need maximum compatibility with older phones, MMS systems, or 2G/3G voicemail. Pick AMR-WB (16 kHz, 6.60–23.85 kbps) when speech clarity matters and the target device supports HD Voice — Android since 4.1, modern iOS, VLC, FFmpeg, and most VoLTE handsets. AMR-WB at 12.65 kbps usually sounds noticeably clearer than AMR-NB at 12.2 kbps despite roughly equal bitrates.

Will AMR sound good for music or stereo audio?

No. AMR is engineered specifically for speech. The codec discards frequencies above 3.4 kHz (NB) or 7 kHz (WB), and it's mono only. Music, sound effects, and stereo content will sound muffled and lose channel separation. For music in a VOC file, convert to VOC to MP3 at 128 kbps or higher, or VOC to WAV for lossless output instead.

What devices and apps can play AMR files?

VLC, FFmpeg-based players, Android (native since launch in 2008), iOS via third-party apps and Files-app preview, QuickTime on older macOS, Windows Media Player with the K-Lite codec pack, and most professional NLEs. AMR is also the payload that flows through MMS messaging and was the mandatory speech codec for 3G mobile phones per 3GPP TS 26.071.

Why does my converted AMR sound robotic or warbly at low bitrates?

ACELP, the underlying codec, models the human vocal tract using algebraic codebooks. At 4.75 kbps it has very few bits per frame to spend, so consonants and sibilants ("s", "sh", "f") often come through as a thin warble. Step up to 7.40 kbps or 12.2 kbps for AMR-NB, or to AMR-WB at 12.65+ kbps, to keep that fidelity.

Can I keep stereo channels when converting VOC to AMR?

No — AMR is mono-only by specification. If your VOC is stereo, the converter downmixes to mono before encoding. If preserving stereo matters (for example, a stereo dialogue recording with left/right speakers on separate channels), convert VOC to MP3 or VOC to AAC instead, both of which keep stereo.

Is AMR still relevant in 2026 now that VoLTE and Opus exist?

Yes — AMR-WB (G.722.2) is still the codec carrying HD Voice over VoLTE on most carriers worldwide, even as Opus has taken over WebRTC and modern messaging. The AMR-NB patent pool expired in 2024, so encoders and decoders are now royalty-free for any use. For legacy MMS, voicemail systems, and 3GPP/3GPP2 toolchains, AMR remains the default.

Can I trim my VOC down before encoding to AMR?

Yes. Use the Trim control on the conversion page to set a start time and duration, so only the speech segment you want is encoded. This is the simplest way to keep AMR file sizes minimal — there's no point encoding silence at 12 kbps if you can cut it first. For more advanced multi-segment editing, use the Audio Cutter on the source VOC first, then convert each piece to AMR.