AllSubConverter

Free subtitle converter and toolkit for SRT, VTT, ASS and more.

About this tool

AllSubConverter is a free, browser-based toolkit designed for comprehensive subtitle file management. It offers a wide array of tools for converting, editing, cleaning, syncing, translating, and optimizing subtitle files. The platform supports numerous formats including SRT, VTT, ASS, SSA, LRC, TTML, SCC, STL, and YouTube JSON, catering to a variety of user needs.

This tool is ideal for subtitle creators, translators, developers, and language learners who frequently work with subtitle files. Whether you need to change file formats, correct text and timing issues, synchronize subtitles with video, or enhance their quality, AllSubConverter provides a centralized solution. Its privacy-first approach ensures that standard subtitle processing occurs directly within your browser, meaning your files remain on your device.

Key features include over 40 conversion routes, more than 30 editing, syncing, QA, and AI tools, and batch workflow capabilities. Users can chain multiple tools together for a powerful, simplified workflow. The platform emphasizes local processing for standard tools, offering speed, privacy, and offline functionality. AI tools are available, but they send only cue text and an API key to the chosen provider.

Getting started is straightforward. Users can drag and drop their subtitle files directly into the workspace or browse to upload them. Once uploaded, they can select from the extensive list of tools to convert, edit, sync, enhance, or analyze their subtitle files before exporting them in the desired format.

Peplio's take

Most online subtitle converters do one job and upload your file to their server. AllSubConverter takes a smarter approach: one workspace where your file moves through every step, from format conversion to timing fixes to translation, without jumping between five different sites.

The privacy-first design is the real standout. Standard tools run locally in the browser, and the AI tools use a bring-your-own-key model, so there’s no middleman holding your files or your content. That’s a big plus for creators and translators working with unreleased videos.

The trade-off is that AI features need your own API key, which may confuse non-technical users. With 117+ tools, beginners might also take a minute to find their way around. Best for content creators, subtitle translators, video editors and developers working with subtitle files.

Written by Sougan Kumar Mandi, October 2026

Key features

117+ subtitle toolsConvert, edit, sync, clean, translate and export subtitles in one place.

11 core formatsSupports SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI, TXT and YouTube JSON3.

Local processingStandard tools run in your browser, so subtitle files are never uploaded.

Works offlineMany tools keep working even without an internet connection.

Chained workflowUpload once and pass your file through convert, edit, enhance and export steps.

Sync and timing toolsShift timestamps, adjust speed, resync and convert frame rates.

Clean and fixRemove duplicates, fix spacing, repair timing and balance subtitle lines.

AI translatorTranslate subtitles into 19 languages using your own API key.

AI rewriter and annotatorImprove or shorten dialogue and add furigana, pinyin or ruby annotations.

QA and analysisCheck reading speed, overlaps, timing and consistency before publishing.

Batch processingProcess multiple subtitle files at once in the workspace.

Perfect for

YouTubers and video creators adding subtitles

Subtitle translators working on multilingual content

Video editors who need to fix subtitle timing

Language learners using subtitles with annotations

Developers handling subtitle file formats

Anyone converting SRT, VTT or ASS files privately

How to use AllSubConverter

Open AllSubConverter and click Open Workspace
Drag and drop your subtitle file or click to browse
Choose a tool like Convert, Edit, Sync or Translate
Chain more tools if needed, your file carries through every step
Preview the result in the live preview panel
Export the finished subtitles in the format you need

Pricing

FreeFree to use

Web app

AllSubConverter FAQ

Is AllSubConverter free?

Yes, the standard subtitle tools are free. A Pro plan is available for extra features.

Does AllSubConverter upload my subtitle files?

No. Standard tools run in your browser, so your files stay on your device.

Which subtitle formats does AllSubConverter support?

SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI, TXT and YouTube JSON3.

How do the AI subtitle tools work?

You add your own API key, and requests go directly from your browser to the AI provider.

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AllSubConverter is listed as an alternative to Subtitle Edit, Aegisub, Subtitle Tools, Kapwing subtitle editor. More tools from the PeplioHUB community: