Convert Adaptive Multi-Rate Audio (.amr) to WebM Video (.webm) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .amr file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .webm file when it's ready.
WebM is Google's open-source multimedia container designed for the web, typically pairing VP8/VP9 video with Vorbis or Opus audio. For audio-only content, WebM with Opus is the most efficient combination, offering excellent compression and native support in Chrome, Firefox, and Edge. Converting AMR voice recordings to WebM/Opus gives you a web-optimized audio file with the lowest possible latency and best quality at low bit rates.
WebM/Opus is the technically superior choice for web audio delivery. Opus was specifically designed for both speech and music, performing better than both Vorbis and AAC at bit rates below 64 kbps — exactly where voice recordings live. Chrome and Firefox play WebM/Opus with the lowest latency of any format. For web applications, progressive web apps, and WebRTC-adjacent systems, WebM is the native format.
FFmpeg decodes the AMR audio and re-encodes it using the libopus encoder at 32-64 kbps (optimal for speech) inside a WebM container. Opus excels at low bit rates thanks to its hybrid architecture that combines SILK (speech) and CELT (music) coding modes. At 32 kbps, Opus speech quality rivals other codecs at 64 kbps.
Opus at 32 kbps already surpasses AMR-WB at its maximum 23.85 kbps in both clarity and bandwidth. For AMR-NB sources, even 24 kbps Opus faithfully reproduces the available content. The quality improvement from using a modern codec is tangible even with the same source material.
| Device | AMR | WebM |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
AMR to WebM/Opus is the best conversion for web-first audio delivery, offering superior compression and near-universal browser support.
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ทุกเบราว์เซอร์ ทุกอุปกรณ์
| Native |
| ฟีเจอร์ | AMR | WebM |
|---|---|---|
| ชื่อเต็ม | Adaptive Multi-Rate Audio | WebM Video |
| นามสกุล | .amr | .webm |
| เหมาะที่สุดสำหรับ | Speech optimized | Web optimized |