Free online TXT to FLAC converter

Some audio players and devices accept FLAC tracks but cannot open a written script, so the words must first be turned into speech. Converting a TXT file this way means using text-to-speech, then saving the resulting audio in FLAC format.

What the TXT format is

A TXT file contains plain characters without audio, formatting, or embedded speech. Text editors, code editors, and word processors can create or save TXT files; scripts, notes, and other unformatted writing are common examples. A TXT file cannot be encoded directly as audio without a text-to-speech step.

What the FLAC format is

FLAC is a lossless audio format: decoding a FLAC file reproduces the encoded audio samples exactly. It is useful for archiving synthesized speech without lossy audio compression, though files are generally larger than MP3 files and FLAC support varies among devices.

How to convert TXT to FLAC

The conversion has two stages: synthesize speech from the words, then encode that audio as FLAC.

Online on 101convert.com

1. Upload the TXT file on the converter page. Multiple files can be processed as a batch; check the page for its per-file size limit.
2. Before converting, select the voice language and reading speed.
3. Start the conversion and download the resulting FLAC file.

Offline with desktop software

With the free, open-source eSpeak NG and FFmpeg command-line tools, generate a WAV file and encode it as FLAC. Both tools are available for Windows, macOS, and Linux. Install them first, then run these commands in a terminal or command prompt from the folder containing input.txt:

1. Synthesize the speech: espeak-ng -v en-us -s 160 -f input.txt -w speech.wav. Replace en-us with an available voice code for the desired language; -s 160 sets the speaking speed.
2. Encode the WAV audio as FLAC: ffmpeg -i speech.wav -c:a flac output.flac.

Quality and compatibility

FLAC preserves the synthesized audio without further loss, but it does not improve the voice or pronunciation produced by the speech engine. Check the selected voice language and listen to the output; pronunciation depends on the engine and voice, and some devices do not support FLAC playback.