M4A audio
An MPEG-4 audio container commonly used for AAC and Apple audio.
Best for mobile libraries, podcasts, and efficient playback.
M4A to OPUS
Convert M4A files to OPUS online, set one output for the whole batch, and download each result directly.
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How to convert M4A to OPUS
The converter works through your browser and an isolated processing queue, with one batch output that you can override for individual files.
- 1Add your filesDrop up to 25 M4A files into the converter or choose them from your device.
- 2Choose the resultSet every compatible file to OPUS at once, then adjust individual rows if needed.
- 3Convert and downloadStart the batch and download finished files directly before guest files are removed after 1 hour.
Opus audio
A modern open codec optimized for speech and music at low bitrates.
Best for voice, streaming, conferencing, and web audio.
Browse by file type
Each category has its own converter, format list, and common routes.
Images
JPG, PNG, WebP, AVIF, GIF, TIFF, BMP, HEIC, ICO, SVG
Documents
DOC, DOCX, ODT, RTF, TXT, HTML, PDF
Spreadsheets
XLS, XLSX, ODS, CSV, PDF
Presentations
PPT, PPTX, ODP, PDF
PDF, DOCX, JPG, PNG, TXT
Audio
MP3, WAV, AAC, FLAC, OGG, M4A, Opus
Video
MP4, WebM, MOV, AVI, MKV, GIF, MP3
Archives
ZIP, TAR, TAR.GZ, 7Z
Ebooks
EPUB, MOBI, AZW3, PDF, TXT
Keep the useful ones.
Conversions remain temporary even when you are signed in, so save a result to your workspace when you want a stable URL and revision history.
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