WebSubtitle

Add local and online subtitle files to web videos with per-video sync and styling.

WebSubtitle is a Chrome extension that lets you add and adjust subtitles on videos across the web. Open a subtitle file from your device or search OpenSubtitles, then attach it to the video you want. Adjust subtitle timing and appearance, or edit supported subtitles in the web editor and apply the changes back to the video. When supported by Chrome and the selected language pair, you can translate an existing subtitle track on your device and add the result as a new track. Translation starts only when you explicitly request it, and the original subtitles remain unchanged. Key features: • Display local subtitle files on web videos • Search and apply subtitles from OpenSubtitles • Correct constant timing offsets and progressive subtitle drift • Adjust subtitle position, text size, and background • Edit subtitles and apply changes back to the video • Translate subtitles on device in supported environments • Manage multiple videos and subtitle tracks • Check videos embedded from sites you explicitly allow Local subtitles, content being edited, and subtitle text used for language detection and translation are not sent to WebSubtitle servers or external translation providers. On-device translation uses Chrome’s browser-managed features, and Chrome may prepare the required translation resources. Search information is sent to OpenSubtitles only when you start a search. WebSubtitle works with accessible HTML5 videos. Videos embedded from another site may require you to explicitly grant access to that site. Compatibility may be limited with DRM-protected content, restricted iframes, proprietary video players, or custom fullscreen implementations. On-device translation availability depends on your Chrome version, device, browser settings, and selected language pair. Machine translation may be inaccurate, so review the result before using it.