Free online RTF to M4A converter

A phone player or audiobook workflow may accept M4A but not RTF, so the document must be read aloud and rendered as audio. This is a text-to-speech conversion, not a direct audio transcode.

What the RTF format is

RTF (Rich Text Format) stores formatted text, including fonts, styles, and basic page layout. Word processors such as Microsoft Word, LibreOffice Writer, and WordPad can create or open RTF files; the format is common in document exchange. RTF contains written content, not a spoken recording.

What the M4A format is

M4A is an audio file format commonly used for AAC-encoded sound. It is supported by many phones, media players, and audio libraries, and is suitable for storing synthesized speech. An RTF-to-M4A workflow uses text-to-speech software to create a voice recording and saves that audio in an M4A file.

How to convert an RTF file to M4A

Online on 101convert.com

1. Upload the RTF file on the 101convert.com converter page. You can add several files for batch conversion; the page shows the per-file size limit.
2. Choose the voice language and reading speed before converting.
3. Start the conversion, then download the resulting M4A file or files.

Offline with desktop software

Free command-line workflow: On Windows, macOS, or Linux, use LibreOffice to extract plain text, eSpeak NG to synthesize speech, and FFmpeg to encode the audio as M4A. With all three installed, run these commands in a terminal from the folder containing document.rtf:

1. libreoffice --headless --convert-to txt --outdir work document.rtf
2. espeak-ng -f work/document.txt -w work/speech.wav
3. ffmpeg -i work/speech.wav -ac 1 -c:a aac -b:a 64k speech.m4a

The first command creates work/document.txt; create the work folder first. The last command encodes mono AAC audio at 64 kb/s in an M4A file.

Balabolka: This free Windows desktop program can open RTF documents and save synthesized speech as M4A. Open the file with File → Open, select an installed speech voice, then choose File → Save Audio File and select M4A as the output format.

Quality and limitations

The output voice is synthesized, so it will not preserve the author’s voice, page layout, or visual formatting. Pronunciation and pacing depend on the selected voice and reading-speed setting; review names, abbreviations, and technical terms in the audio. M4A playback requires a player that supports the audio encoding used inside the file.