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

Other FLAC conversions

FLAC to Text

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FLAC to Captions

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Other file formats

OGG to text
WEBA to text
GSM to text
WAV to text
OPUS to text
MUS to text
AIFF to text
OGA to text
MPA to text
AIFC to text
See all supported file formats
Reviews

Trusted by web developers

4.98 rating from 211 reviews

I love the software and it makes my life so much easier...you cannot believe!
SA
Sergio A.
Querataro City, Mexico
I am VERY happy with the transcription! There were a few glitches, but 98% great.
JC
Jonathan C.
Rice Lake, WI, USA
Seriously the best transcript I’ve ever seen. And the synchronized editor is amazing. I will be using again and I will be sharing with my friends :)
CB
Cara B.
Edmond, OK, USA
I love how easy it is – it saves me so much time transcribing – I can just pull out the main points of interest from the transcription.
NJ
Noreena J.
Windsor, Canada
Super easy interface, easy to upload and great results.
DK
Dan K.
Seattle, OR, USA
I tried 4 other services, and Sonix is the easiest to use, most accurate, and more reasonably priced for the quality.
MJ
Melissa J.
Prague, Czechia
After trying a number of MP3 transcribers, I am most impressed with Sonix! It was easy to use and was much more accurate than any of the others that I tried.
SL
Stephen L.
Boca Raton, FL, USA
Sonix is the best transcription program I've ever used. It was almost error-free. I wish I could have used it longer!
AI
Aliye I.
Istanbul, Turkey
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