Subtitle Edit is a free, open source editor for video subtitles that runs on Windows. It lets you adjust subtitles that are out of sync with a video, create new ones from scratch using a waveform and spectrogram view, translate them, and convert between more than 300 formats including SubRip, WebVTT, Advanced Sub Station Alpha, TTML and EBU STL. Speech recognition through Whisper, text to speech through several engines, and automatic translation through services such as Google Translate and DeepL are built in. There is no paid plan, and the full C# source code is available under a GPL or LGPL license.
The audience is anyone who works with captions and subtitles at a hands-on level: fansubbers and translators, video editors, post-production staff, accessibility specialists, archivists, and developers who need a subtitle library. Beginners can sync a file with a few clicks, while professionals rely on the fix-common-errors wizard, spell checking with LibreOffice dictionaries, merge and split tools, and batch conversion from the command line. The interface is available in 32+ languages, which helps translators and international teams work in their own language.
Typical jobs include shifting a subtitle file that runs late, point-synchronizing it against the video, and fixing line lengths and reading speed before release. A localization team can translate a track through DeepL or a local model and review it side by side. A broadcaster can export EBU STL or PAC files, and a disc archivist can rip subtitles from a decrypted DVD or run OCR on VobSub and Blu-ray image subtitles. Creators can generate a video with burned-in subtitles, or with subtitles on a transparent background, and programmers can embed the LibSe.dll library in their own software.
