PST

ASS to VTT Converter

Upload an Advanced SubStation Alpha (.ass / .ssa) subtitle file and instantly download it as a WebVTT (.vtt) file. Override codes are stripped automatically and timestamps are re-expressed in VTT format.

Upload ASS / SSA File
Supported: .ass, .ssa (UTF-8). Drag and drop or choose a file.
Upload an ASS / SSA file to preview subtitle cues and download as VTT.

Convert ASS to VTT for HTML5 video and web captions

Upload your ASS or SSA file and get a web-ready WebVTT file for the HTML5 track element, course platforms, Vimeo, and browser players. ASS-only style codes are cleaned up while dialogue text and timing are preserved. No account needed, no file uploads, and everything runs in your browser.

Instant Conversion

Convert ASS to VTT in milliseconds - entirely in your browser. No server uploads, no queues, and no account required.

Override Codes Stripped

All ASS styling overrides such as {\an8}, {\pos(x,y)}, {\b1}, and {\c&Hffffff&} are removed cleanly, leaving only the subtitle text ready for web use.

Accurate Timestamps

All start and end times are converted precisely from ASS centisecond format (H:MM:SS.cc) to VTT millisecond format (HH:MM:SS.mmm). No drift, no rounding errors.

One-Click Download

Preview all subtitle cues after uploading, then download the converted VTT file with a single click. Free, with no account required.

How to Convert ASS to VTT

  1. 1

    Upload your ASS / SSA file

    Drag and drop your subtitle file onto the upload area, or click to open the file browser. Both .ass and .ssa files are supported.

  2. 2

    Preview the subtitle cues

    The tool parses the [Events] section, strips all override codes, and displays each dialogue cue with its timestamp in the preview panel.

  3. 3

    Download the VTT file

    Click "Download VTT" to save the converted file. Timestamps are reformatted to HH:MM:SS.mmm and the WEBVTT header is added automatically.

ASS to VTT examples for HTML5 video, web captions, and styling cleanup

Convert ASS or SSA to WebVTT when you want subtitle text from a styled ASS file to work with HTML5 video, browser captions, web platforms, or VTT-based publishing systems. Timing and dialogue are preserved while ASS-only styling is cleaned up.

Example input and output

ASS input
Dialogue: 0,0:00:02.40,0:00:05.10,Default,,0,0,0,,{\b1}Welcome{\b0}
VTT output
WEBVTT 00:00:02.400 --> 00:00:05.100 Welcome

Best for

HTML5 video

Use VTT captions with the browser track element for web pages, courses, documentation, and custom video players.

Web publishing

Convert styled ASS subtitles into a simpler format accepted by web platforms.

Subtitle cleanup

Remove ASS override tags while keeping dialogue and timing for web playback.

Common file issues handled

WEBVTT header

The output includes the required header so it is ready for web players.

ASS tags removed

Advanced styling and positioning codes are stripped because WebVTT uses different styling rules.

Timestamp precision

ASS centiseconds are converted into VTT millisecond timestamps.

Dialogue order

Events are exported in file order with cue text preserved.

Format compatibility guide

ASS is rich subtitle styling

ASS supports placement, outlines, colors, signs, and karaoke effects that most web caption workflows cannot keep.

Read the ASS guide

VTT is browser-ready

WebVTT is the right format for HTML5 video captions, LMS uploads, web players, and browser-based caption tracks.

Read the ASS to VTT guide

Need widest playback support?

Use ASS to SRT when you want a simpler file for smart TVs, basic editors, or players that reject WebVTT.

Read the ASS to SRT guide

Frequently Asked Questions

Why convert ASS to VTT instead of SRT?
VTT (WebVTT) is the native subtitle format for HTML5 video. If you are embedding subtitles in a web page using the <track> element, or uploading to platforms like YouTube or Vimeo, VTT is preferred over SRT. Converting ASS to VTT gives you a web-ready file with clean timestamps in HH:MM:SS.mmm format.
What happens to ASS styling and override codes?
ASS override codes (e.g. {\b1}, {\i1}, {\pos(320,50)}, {\c&H00FFFF&}) are stripped during conversion because basic VTT does not support ASS-style inline metadata. Soft line breaks (\N, \n) are converted to real line breaks in the VTT output. The dialogue text itself is preserved exactly.
Does this tool support SSA files as well?
Yes. Both .ass (Advanced SubStation Alpha) and .ssa (SubStation Alpha) files are supported. Both formats use the same [Events] section structure, so the parser handles them identically.
Does this tool upload my file to a server?
No. The entire conversion happens locally in your browser using JavaScript. Your file never leaves your device, which keeps the conversion private after the page has loaded.
Which players and platforms support VTT subtitles?
WebVTT is supported natively by all modern web browsers (Chrome, Firefox, Safari, Edge) via the HTML5 <track> element. It is also supported by YouTube, Vimeo, and most streaming platforms. Desktop media players such as VLC also support VTT. For anime-specific players or tools that require rich styling, keep your subtitles in ASS format.