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Subtitle Workspace

Convert, Edit, Optimize
Subtitles - All in one place

117+ subtitle tools. Convert, edit, sync, translate and export subtitles across 11 core formats plus YouTube JSON3. Standard tools run in your browser; each file can be up to 50 MB.

AllSubConverter is a privacy-first subtitle processing workspace for converting, editing, syncing, translating, cleaning, and optimizing subtitle files. Standard tools process files directly in your browser, while AI tools send cue text directly to the provider you choose.

Local Standard ToolsNo Standard-Tool UploadPrivacy FirstAll Formats
Open WorkspaceExplore All Tools
Built for subtitle creators, translators, developers, and language learners.

Drag & drop your subtitle file here

or click to browse

Standard subtitle processing stays in your browser.
SRTVTTASSSSALRCSBVTTMLSCCSTLSMITXTJSON

Powerful Workflow, Simplified

Upload once, then chain the tools you need - your file carries through every step.

1. Upload

Bring your subtitle file into your workspace.

2. Convert

Convert subtitle formats while preserving text, timing, and other data supported by the target format.

3. Edit & Clean

Fix text, timing, formatting, and subtitle quality.

4. Enhance

Translate, annotate, optimize, and improve your subtitles.

5. Export

Save your finished subtitles in the format you need.

Why Local First?

Standard subtitle tools process files directly in your browser. AI tools send only cue text and your API key directly to the provider you choose.

Private by Default

Standard subtitle files stay on your device during local processing.

No Uploads

Standard tools have no server upload step and no file-transfer wait.

Fast Processing

Use your device computing power for instant processing.

Works Offline

Many tools continue to work without an internet connection.

Everything You Need to Work with Subtitles

40+ conversion routes and 30+ editing, sync, QA and AI tools - all in one place.

Convert

40+ conversion routes

SRT | VTT | ASS | SSA | LRC | TTML | SCC | STL...

Explore converters

Edit & Clean

Edit, clean, normalize, and repair subtitle content.

Explore edit tools

Sync & Timing

Shift, retime, resync, adjust speed and frame rate.

Explore sync tools

AI Tools

Translate, rewrite, annotate, and enhance subtitles.

Explore AI tools

QA & Analysis

Check quality, reading speed, timing, overlaps, and consistency.

Explore QA tools

Popular Subtitle Tools

Jump straight into the tools people use most.

SRT to VTT Subtitle ConverterVTT to SRT Subtitle ConverterSRT to ASS Subtitle ConverterSubtitle Sync & Timing CalibrationSubtitle Format CleanerSubtitle EditorAI Subtitle TranslatorSubtitle MergerSubtitle Quality Checker

One Workspace for Every Subtitle Workflow

Whether you are converting a subtitle format, fixing timing, cleaning up transcripts, or preparing subtitles for publication, AllSubConverter brings the tools you need into one privacy-first workspace.

Convert Subtitle Formats

Convert SRT, VTT, ASS, SSA, LRC, TTML and more in a single click.

Fix Subtitle Timing

Shift timestamps, adjust speed, convert frame rates, and synchronize subtitles.

Clean & Optimize

Remove duplicates, fix spacing, balance subtitle lines, and improve readability.

Translate & Enhance

Translate subtitles, rewrite dialogue, add annotations, and prepare multilingual content.

AI Tools That Save You Time

Bring your own API key. AI requests are sent directly from your browser - no middleman.

AI Translate

Translate subtitles into 19 built-in target languages

AI Rewriter

Improve, shorten, expand, or rewrite subtitle dialogue (BYOK).

AI Annotator

Add furigana/pinyin/ruby annotations

Supported formats

All popular subtitle formats supported

SRTVTTASSSSASBVLRCTTMLTXTSTLSCCSMI+ more
View all

Your Subtitle Workspace, All in One Place

Convert, edit, clean, sync, translate, and export - without jumping between different tools.

  • Multiple files in one workspace
  • Local-first processing
  • Workflow-based tools
  • Real-time preview
Workspace
Live preview

Files

movie.srt3 cues

Info

FormatSRT
Duration00:11
Cues3

Original Subtitle

100:01Hello world, sample line
200:04Second cue of dialogue
300:08Final preview line

Timeline Preview

Current Tool

Output Format

VTTASSLRCTXTTTMLSMI
WEBVTT header
Line ending LF
Keep identifiers

Recommended workflow

Frequently Asked Questions

Everything you need to know about working with subtitles in AllSubConverter.

What is AllSubConverter?

AllSubConverter is a privacy-first subtitle processing workspace. It bundles 117+ tools for converting, editing, syncing, translating, cleaning, and exporting subtitle files. Standard tools run directly in your browser; AI tools use the provider and API key you choose.

Do my subtitles get uploaded to a server?

Standard tools process files locally in your browser, so those subtitle files do not leave your device. AI tools send the cue text needed for the request directly from your browser to the chosen provider; they do not upload the original file.

Which subtitle formats are supported?

AllSubConverter supports 11 core subtitle formats - SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI and TXT - plus YouTube JSON3 input. Available conversion routes depend on the source and target format.

How do the AI tools work?

The AI Translator, Rewriter, and Annotator run from your browser. You bring your own API key, and supported requests go directly to OpenAI or an approved OpenAI-compatible provider. Provider API usage may be billed to your account.

Is AllSubConverter free to use?

Yes. Every converter and editing tool is free with no daily caps and no sign-up required. Each file can be up to 50 MB, and batches can contain up to 200 files or 1 GB total. AI tools only need your own API key.

Can I process multiple files at once?

Yes. The workspace handles multiple selected files, and the batch converter can process up to 200 files or 1 GB in a single run.