Convert

ASF to VTT converter

Transcribe ASF to VTT for free, with no sign-up and no paywall after upload.

    Converted on our server · deleted after 60 min · Free limits

    Where it runs
    Our server, files deleted in 60 min
    Free allowance
    25 files a day, up to 200 MB each
    Typical time
    About a third of the recording's length
    Sign-up
    Not needed

    What happens to your ASF

    Speech is transcribed by Whisper running on our own server. It recognises 99 languages and detects the language for you. Files up to 30 minutes long.

    You get a VTT file with timed captions you can load into YouTube, CapCut, Premiere or VLC.

    This conversion runs on our server. Your file is deleted within 60 minutes, and you can delete it yourself as soon as you have downloaded the result.

    How to convert ASF to VTT

    1. Choose your file Tap Choose files and pick the ASF file, or drop it onto the page. You can add several at once.
    2. Transcribe to VTT Tap Convert. The file is sent over an encrypted connection and converted on our server.
    3. Download Tap Download to save the VTT file. It is deleted from our server within 60 minutes, or straight away if you tap Delete.

    What is an ASF file?

    Microsoft's container for Windows Media video and audio.

    Windows Media Player and VLC.

    More about ASF files

    What is a VTT file?

    The subtitle format for web video players and HTML5.

    Browsers, YouTube, Vimeo and VLC.

    More about VTT files

    Questions

    Is converting ASF to VTT free?

    Yes. You can convert up to 25 files a day on our server for free, each up to 200 MB, with no sign-up. The limit is shown before you upload, and we never ask you to pay to download a file you have already converted.

    Is it safe to convert my ASF files here?

    Yes. Files travel over an encrypted connection, are processed on our own server, and are deleted within 60 minutes. Nobody looks at them, and you can delete them yourself straight after downloading.

    How long does ASF to VTT take?

    About a third of the recording's length. Bigger files take longer, and you can watch the progress on each file.

    Can I convert ASF to VTT on my iPhone or Android phone?

    Yes. The converter works in Safari, Chrome and any modern browser. Tap Choose files, pick from Photos or Files, and download the result to your phone.

    How do I open a VTT file?

    Browsers, YouTube, Vimeo and VLC.

    Convert ASF to other formats

    Convert other files to VTT