Convert FLAC to VTT

Create WebVTT caption files from your lossless FLAC audio for HTML5 video players. Maximum quality audio means maximum caption accuracy.

HTML5 ready
5-min turnaround
Web compatible
Audio
Video
DOCX
SRT/VTT
PDF
53+ Languages
About This Format

Understanding FLAC files

What is a FLAC file?

Lossless audio compression - CD quality at half the size

Free Lossless Audio Codec file (FLAC) is an audio format similar to MP3, but lossless. What does this mean? The audio in a FLAC file is compressed without any loss in quality, whereas a MP3 file compresses the audio but usually lowers the quality of the file by excluding certain frequencies. A FLAC file works similar to how a ZIP file is compressed. Since FLAC is highly optimized for audio, you’ll receive a better compression ratio when compared to the ZIP compression algorithms. You can play compressed FLAC files in your favorite media player (including VLC, your car, or home stereo, or computer) just like you would an MP3 file (without having to uncompress it separately).
FLAC files are one of the fastest and most widely supported lossless audio codecs and is one of the few that are non-proprietary and has a well-documented open-source reference implementation. There are no attached patents for FLAC files. It was developed in 2000 and FLAC files discourage developers to not include any DRM features.

Common Uses

  • Audiophile music collections
  • Music archiving
  • High-fidelity audio
  • Lossless music streaming

Audio Quality

Bit-perfect lossless compression - identical to original

Transcription Tips for FLAC

  • Excellent for transcription - no quality loss from compression
  • Smaller than WAV but same audio quality
  • Well-suited for interview and podcast archiving

Where FLAC Files Come From

  • Bandcamp downloads
  • HD music stores
  • Audio archivists
  • Tidal streaming rips
10x
Faster than real-time
Get your FLAC VTT in minutes
99%
Accuracy rate
Industry-leading AI for FLAC files
53+
Languages
Captions in any language
30+
Export formats
VTT, SRT, text, and more
How It Works

Convert FLAC to VTT in 6 steps

Step 1

Create account

Sign up for Sonix's free trial. Includes 30 minutes free.

Step 2

Upload file

Upload your FLAC file from your computer or cloud storage.

Step 3

Select language

Choose from 53+ languages spoken in your file.

Step 4

Auto-transcribe

Sonix AI transcribes and timestamps your FLAC audio.

Step 5

Edit captions

Fine-tune caption timing and text with our editor.

Step 6

Export VTT

Download your FLAC captions as a WebVTT file.

Common Questions

Everything about FLAC to VTT

What's the advantage of FLAC for VTT captions?

FLAC's lossless audio provides the clearest signal for accurate transcription and precise timestamps. This translates to more accurate VTT captions.

Can I style VTT captions from FLAC?

Yes! WebVTT supports CSS styling for fonts, colors, and positioning. Sonix exports clean VTT files you can customize.

Are FLAC-to-VTT captions accessible?

Absolutely! VTT captions from Sonix meet WCAG accessibility guidelines. Lossless audio quality helps achieve maximum caption accuracy.

How do I add FLAC VTT captions to my website?

Add a <track> element to your HTML5 video pointing to your VTT file. The browser handles caption display automatically.

Can I create multi-language VTT from FLAC?

Yes! Transcribe your FLAC once, then use Sonix's translation feature to create versions in 50+ languages.

Do FLAC VTT captions work on mobile?

Yes! WebVTT is supported on all modern mobile browsers.

Why Sonix

Web-ready VTT from FLAC files

HTML5 Native

VTT is the web standard for captions, supported by all modern browsers.

Styleable

Apply CSS styling for colors, fonts, positioning, and more.

Precise Timing

Word-level timestamps ensure perfect sync with your video.

Universal Support

Works with all HTML5 video players and web platforms.

Related

More ways to convert FLAC files

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Other file formats

AIFF to text
MP2 to text
AU to text
CAF to text
M4A to text
WEBA to text
MP3 to text
MTS to text
MPGA to text
MPA to text
See all supported file formats
Reviews

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Sonix's transcription and translation features are stunningly accurate, I'm very impressed.
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Istanbul, Turkey
I love, love, love this service! Sonix is amazing! I plan to use the transcripts I've gotten so far to update the content of my podcast so that it will aid in SEO on my website. Very, very useful!
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Washington DC, USA
Unbelievable! Wow, it's amazing. Really amazing. I didn't believe it so I wanna test something and I got actually result I wanted. Amazing!
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Dhaka, Bangledesh
Sonix is simple and very easy to use and the results were very nearly perfect. I would definitely recommended the site to anyone who asks me.
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Nathan L.
St. Thomas, Canada
In one word? FAN-TAS-TIC!! The possibility to split the transcript to subtitles AND split them! THAT IS FANTASTIC!!
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Amsterfoot, Netherlands
I absolutely loved how well the software was able to distinguish between individual speakers. Exceptional product and well-polished.
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Michael B.
Tampa, FL, USA
The highest accuracy I have ever achieved through similar services.
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Townsville, Australia
I have been a dialogue system researcher for half a decade now. I had build my own app for doing the transcriptions. Sonix was clearly better than what I had. I made the switch!
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Ramesh M.
Portland, OR USA
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