Converted in your browser

WebVTT to JSON Converter

WebVTT cues are parsed by subtitle-ir and serialized as JSON for vtt-to-json.

Free anonymous limits

Free without signing in: 10 server conversions per day, 10 MB each. Browser-only conversions stay on this device and do not count against server limits.

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Supported formats

.vtt → .json

Conversion engine

subtitle-ir

Encrypted in transitDeleted within 24 hData formats stay in browser10 free today

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Pair-specific

Features & use cases

Features

WebVTT cues are parsed by subtitle-ir and serialized as JSON for vtt-to-json.
Cue start and end times are normalized to millisecond precision; SRT commas and VTT periods are converted as needed.
VTT cue settings such as positioning are retained only when they can be represented by the target format.
Cue text and line breaks are preserved while cue numbering is regenerated for formats that need indexes.

Use cases

Translate VTT integration payloads into JSON for another system.
Inspect nested fields, arrays, and missing values before handing data to automation.
Create clean fixtures for tests, demos, or support investigations.
Share structured exports with teams that need a different file format.

See real results

Original

events.json

[{
  "id":"evt_100",
  "account":{"name":"Northwind","tier":"pro"},
  "metrics":{"rows":1280,"latency_ms":842},
  "tags":["etl","nightly"]
}]

Converted

Pretty preview

id,account.name,account.tier,metrics.rows,metrics.latency_ms,tags
evt_100,Northwind,pro,1280,842,"[""etl"",""nightly""]"
evt_101,Atlas,starter,320,512,"[""finance""]"

2 rows

arrays stringified

0.2 s

in-browser

Try this conversion

What actually changes

WebVTT cues are parsed by subtitle-ir and serialized as JSON for vtt-to-json.

Cue start and end times are normalized to millisecond precision; SRT commas and VTT periods are converted as needed.

VTT cue settings such as positioning are retained only when they can be represented by the target format.

Cue text and line breaks are preserved while cue numbering is regenerated for formats that need indexes.

JSON output writes an array of cue objects with start, end, text, and available settings fields.

Example

input

1
00:00:01,200 --> 00:00:03,400
Welcome back

output

[{"start":"00:00:01.200","end":"00:00:03.400","text":"Welcome back"}]

Do it in code

cli

ffmpeg -i input.vtt output.json

FAQ

Is timing precision preserved?

Times are normalized to milliseconds. ASS centiseconds become millisecond timestamps with padded precision.

Will ASS styles survive?

This pair does not involve ASS styling.

What schema does CSV use?

CSV schema applies on subtitle-to-CSV pages.

What schema does JSON use?

JSON output is an array of cue objects containing start, end, text, and settings when present.

Can I edit the output in a subtitle tool?

Yes for SRT, VTT, and ASS outputs, but review styling and positioning if the source used advanced features.

Related conversions

CSV to JSON TSV to JSON TXT to JSON JSONL to JSON YAML to JSON XML to JSON XLSX to JSON XLS to JSON ODS to JSON

Everything you need

Browser-first privacy

CSV, JSON, XML, YAML, XLSX, and table conversions run locally when the source and target formats support it.

Warnings, not surprises

Formula drops, flattened arrays, sheet selection, and layout changes are surfaced as conversion warnings.

Batch and zip

Queue multiple files, download individual results, or package them into a zip for handoff.

API, CLI, MCP

Convert from browsers, scripts, automations, and AI assistants with the same warnings and outputs.

Team workspaces

Shared history, API keys, limits, and retention settings keep production conversions controlled.

Retention you control

Browser files never upload; server inputs auto-delete within 24 hours and outputs follow workspace retention.

Comparison

Why teams switch

Decision point

FileTypeConverters

Upload-only converters

Where data files are processed

CSV, JSON, YAML, XML, and spreadsheet files can convert in your browser.

Most tools upload every file to their servers first.

What you learn about fidelity

Warnings call out flattened arrays, dropped formulas, selected sheets, and layout changes.

Downloaded files often arrive with no explanation of what changed.

Batch + zip

Batch files and download individual results or one zip.

Batching is often paid-only or missing.

API, CLI, and MCP

Use the web app, automation, or an AI assistant with the same conversion behavior.

Many converters are web-form only.

Retention control

Browser files never upload; server inputs are deleted within 24 hours.

Retention is usually unclear or not configurable.

Price

Start with free browser conversion and clear paid limits.

Limits are often hidden behind upload steps or subscriptions.

Where data files are processed

FileTypeConverters: CSV, JSON, YAML, XML, and spreadsheet files can convert in your browser.

Upload-only converters: Most tools upload every file to their servers first.

What you learn about fidelity

FileTypeConverters: Warnings call out flattened arrays, dropped formulas, selected sheets, and layout changes.

Upload-only converters: Downloaded files often arrive with no explanation of what changed.

Batch + zip

FileTypeConverters: Batch files and download individual results or one zip.

Upload-only converters: Batching is often paid-only or missing.

API, CLI, and MCP

FileTypeConverters: Use the web app, automation, or an AI assistant with the same conversion behavior.

Upload-only converters: Many converters are web-form only.

Retention control

FileTypeConverters: Browser files never upload; server inputs are deleted within 24 hours.

Upload-only converters: Retention is usually unclear or not configurable.

Price

FileTypeConverters: Start with free browser conversion and clear paid limits.

Upload-only converters: Limits are often hidden behind upload steps or subscriptions.

Choose your plan

Free

$0/mo

50 conversions/month

50 conversions/mo
25 MB max file
No signup required

Get started

Starter

POPULAR

$8.99/mo

For regular conversion work

2-day trial for paid plans

500 conversions/mo
100 MB max file
API + MCP

Start free trial

Pro

$29.99/mo

For heavy teams

5,000 conversions/mo
1 GB max file
API + MCP

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