Convert AMR to MKV — Free Online Converter

MKV (Matroska Video) is an open-source multimedia container that can hold virtually any combination of audio, video, and subtitle streams. While MKV is primarily associated with video, it also works as a highly flexible audio container. Converting AMR to MKV wraps the decoded voice audio in Matroska's extensible framework, enabling advanced features like chapters, tags, and multiple audio tracks.

MKV makes sense when you need to bundle a voice recording with metadata that simpler containers cannot handle — chapter markers for a long interview, embedded subtitles or transcripts, or multiple language tracks. MKV also serves as an intermediate format in multimedia workflows where the audio will later be combined with video using tools like MKVToolNix or FFmpeg.

FFmpeg decodes the AMR audio to PCM and can either copy it as PCM into the MKV container or re-encode to a more common codec (Vorbis, AAC, or FLAC). The Matroska container adds full metadata support including chapters (XML-based), tags, and track metadata. The output is compatible with VLC, MPV, and MKVToolNix.