Free online HTM to AAC converter

An HTM file contains a web page, not recorded sound, so converting it to AAC means using text-to-speech to create spoken audio. This is useful when you want to listen to a page on a phone, media player, or other device that supports AAC.

What the HTM format is

HTM is an extension for HTML web-page files. Browsers, web editors, and other applications that save web pages create or use HTM files. The file can contain readable text alongside markup, links, and references to images or other resources; it does not contain a voice recording by itself.

What the AAC format is

AAC is a lossy audio codec commonly used for compressed spoken audio and music. It can provide smaller files than uncompressed PCM audio at comparable listening quality, and is supported by many phones, computers, and media players. Converting a web page to AAC synthesizes speech from its text; it does not preserve the original page layout or create a recording of embedded audio.

How to convert HTM to AAC

Online on 101convert.com

1. Upload the HTM file to the converter on this page. You can add several files for batch conversion; the page shows the per-file size limit.
2. Before converting, set the voice language and reading speed.
3. Start the conversion, then download the AAC file when it is ready.

Offline with desktop software

On Windows, use the free Balabolka text-to-speech program to read the HTM file and save a WAV file. Then use FFmpeg to encode that audio as AAC:

1. Open the HTM file in Balabolka, choose an installed speech voice, and use Speech → Save Audio File to save the spoken output as speech.wav.
2. Run this FFmpeg command in the folder containing the WAV file: ffmpeg -i speech.wav -c:a aac -b:a 128k output.aac.

FFmpeg runs on Windows, macOS, and Linux. The command uses a 128 kbit/s bitrate; change that value to adjust file size and audio quality.

Quality and limitations

The speech depends on the selected text-to-speech voice and its language support. HTML styling and images are not included in the audio, and scripts or content loaded from external sources may not be read as they appear in a browser. AAC encoding is lossy, so the resulting audio cannot reproduce sound details that were not present in the synthesized speech.