AllSubConverter

AllSubConverter is a privacy-first subtitle workspace with 110+ browser-based tools for converting, editing, synchronizing, cleaning, checking, translating, and exporting subtitles. Users can convert subtitle formats, edit text and timing, fix formatting and encoding issues, synchronize subtitles, merge or split files, optimize line breaks, and run subtitle quality checks.

It supports SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI, TXT, and YouTube JSON3. Standard tools process files directly in the browser, so files do not need to be uploaded to an AllSubConverter server. This local-first approach is useful for private or sensitive files. Batch processing is also supported.

AI tools provide subtitle translation, rewriting, and annotation using a BYOK model with a supported AI provider and the user’s own API key.

AllSubConverter provides one place to manage subtitle workflows from conversion and cleanup to synchronization, AI enhancement, and export.