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VTT to ASS Subtitle Converter

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VTT
WEBVTT
 
00:00:01.000 --> 00:00:04.000
Hello, world!
 
00:00:04.500 --> 00:00:08.000
This is a subtitle file.
 
00:00:08.500 --> 00:00:12.000
Converted locally!
ASS
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:01.00,0:00:04.00,Default,,0,0,0,,Hello, world!
Dialogue: 0,0:00:04.50,0:00:08.00,Default,,0,0,0,,This is a subtitle file.
Dialogue: 0,0:00:08.50,0:00:12.00,Default,,0,0,0,,Converted locally!

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Supports .vtt files up to 50 MB

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How It Works

1

Upload VTT File

Drag & drop or select your .vtt file

2

Convert Instantly

We process it locally in your browser

3

Download ASS

Get your .ass file immediately

More Conversions You Might Need

VTT ASSVTT LRCVTT SRTVTT TXTVTT TTMLVTT SCCVTT STLVTT SMI
View all
SRT ASSLRC ASSSBV ASSSSA ASSTTML ASSSCC ASSSTL ASSSMI ASS

Why Choose AllSubConverter?

Your Privacy Matters

Everything runs in your browser. Your files are never uploaded.

Lightning Fast

Optimized processing engine converts files in seconds.

Free & Local

Each file can be up to 50 MB. Batches can contain up to 200 files or 1 GB total.

Works Everywhere

Works on Windows, Mac, Linux, iOS, Android - any modern browser.

Free Online VTT to ASS Converter

This converter reads WebVTT cue blocks and writes a complete basic ASS document. VTT timing becomes ASS centiseconds, cue line breaks become ASS line-break codes, and each cue uses a single Default style. Cue settings are discarded, while text is carried through without translating VTT inline tags into ASS override tags.

Input Format

VTT

VTT (WebVTT) is a text subtitle format used with web video. Cues contain dot-separated timestamps, optional identifiers, optional cue settings, and one or more text lines. This parser recognizes timestamped cue blocks; NOTE blocks and cues without valid timing or text are skipped.

Output Format

ASS

ASS (Advanced SubStation Alpha v4+) is a sectioned text subtitle format. This converter generates [Script Info], [V4+ Styles], and [Events] sections with one Default Arial 20 style and a 1920x1080 play resolution. Source VTT styling and positioning are not mapped.

Features

Reads timestamped WebVTT cue blocks
Generates a complete basic ASS document
Converts VTT timing to ASS centiseconds
Converts cue line breaks to ASS line-break codes
Uses one predictable Default style
Processes files locally in your browser

Why Convert?

ASS is a practical format for continued timing and styling work.
ASS is supported by desktop subtitle editors and renderer ecosystems.
The conversion turns web cues into a sectioned subtitle script.
A single default style provides a clean starting point for restyling.

Format Differences

VTT uses web-oriented cue blocks; ASS uses Script Info, Styles, and Events sections.
VTT timestamps use milliseconds; ASS timing is written to centiseconds.
VTT cue settings are discarded rather than mapped to ASS positioning.
VTT inline text tags are carried through as text, not converted to ASS override tags.

Common Use Cases

Subtitle Editing

Move VTT cue text and timing into ASS for further work in a subtitle editor.

Restyling

Start from the generated Default style and customize the presentation in an ASS workflow.

Timing Review

Inspect converted cue start and end times while preserving text line breaks.

Related Formats

SRT (SubRip)

Convert VTT to SRT for a simpler plain-text subtitle format.

TTML (Timed Text Markup Language)

Convert VTT to TTML when your workflow expects timed-text XML.

TXT (Plain Text)

Convert VTT to TXT when timing is not required.

Frequently Asked Questions

No. VTT cue settings such as position, line, align, and size are discarded.

The ASS output uses Arial 20, white text, black outline and shadow, bottom-center alignment, and a 1920x1080 play resolution.

NOTE blocks and optional cue identifiers are not carried into the ASS Events section.

Inline tags remain part of the cue text. They are not translated into ASS override tags, so review or convert them manually if needed.

ASS timing is written to centisecond precision. Additional VTT millisecond precision is truncated.

Yes. There is no registration or watermark, and conversion happens in your browser.

Ready to convert your subtitles?

Drop your VTT file here and convert to ASS instantly.

Related Resources

What is VTT?What is ASS?VTT vs ASSASS vs LRCASS vs SBVASS vs SCC