AllSubConverter converts, edits, syncs, translates, cleans, and checks subtitle files in a browser, with optional AI tools for translation, rewriting, and annotation.

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AllSubConverter is a browser-based subtitle converter and editor for managing subtitle files in one workspace. It supports formats including SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI, TXT, and YouTube JSON3, with conversion routes available for common subtitle formats. Tools let you edit subtitle text, adjust timing and frame rates, synchronize captions, clean formatting, merge or split files, and check subtitle quality. A live preview and batch processing support workflows involving multiple files. Standard tools process files locally in your browser, while optional AI tools for translation, rewriting, and annotation send subtitle cue text to a provider you select and require your own API key.

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