Free online FLAC to SRT converter

Source format

FLAC stands for Free Lossless Audio Codec. It is a compressed audio format that preserves the original sound quality without loss, which makes it popular among music collectors, audio engineers, podcasters, and anyone who wants high-quality audio archiving. FLAC files are commonly used for music libraries, master recordings, and long-term storage because they are smaller than uncompressed WAV files while still keeping full fidelity.

Target format

SRT is a SubRip subtitle file format. It is a plain-text format used to store subtitle timing and text for video playback. SRT files are widely supported by video players, editing software, streaming tools, and media servers. Its main advantages are simplicity, compatibility, and easy editing in any text editor. SRT is typically used for captions, subtitles, and translated dialogue.

How to perform the conversion

Important: FLAC and SRT are fundamentally different file types. A FLAC file contains audio, while an SRT file contains subtitle text and timestamps. Because of that, there is no direct technical conversion from FLAC to SRT unless the audio is first transcribed into text and then formatted as subtitles.

The best workflow is:

1. Transcribe the FLAC audio using speech-to-text software or a transcription service. Desktop options include Whisper, OpenAI Whisper-based tools, Vosk, or subtitle editors with transcription features.
2. Review and correct the transcript for punctuation, speaker changes, and timing accuracy.
3. Export or save as SRT from the transcription or subtitle editor.

If you already have a transcript with timestamps, you can create an SRT file in a subtitle editor such as Aegisub, Subtitle Edit, or Jubler. In these tools, open the audio file with File → Open, enter or import the transcript, adjust timing, then use File → Save As and choose .srt.

If your goal is to generate subtitles from FLAC automatically, a practical desktop approach is:

1. Open the FLAC file in a transcription tool.
2. Run speech recognition to produce timed text.
3. Export the result as subtitles.srt.

You can also convert the file on 101convert.com for free, without installing any software, if the site supports your specific workflow.

Notes on quality and limitations

FLAC to SRT is not a direct format conversion. The result depends on the speech quality, background noise, accent, and whether the audio contains music, multiple speakers, or overlapping dialogue. Automatic transcription may need manual correction before the SRT is usable.

Because SRT is plain text, it does not store advanced formatting, speaker labels in a structured way, or rich styling. If you need more features, consider ASS/SSA instead of SRT. Also, if the FLAC file contains only music or non-speech audio, an SRT file may not be meaningful unless you create captions manually.