Overline

Overline is a browser extension focused on one job: making spoken audio readable while it plays. It listens to the audio in your active tab, converts speech to text with AI, and overlays captions on the video. If the speaker talks in a language you don't know, it can translate the words into your own language in near real time.

The reason people reach for it comes down to coverage. Native subtitles exist on some sites, but they're patchy, machine-made, or missing for a lecture, a webinar replay, or a screen recording a colleague sent you. Overline treats the browser itself as the source, so a tab with sound is a tab it can caption. That makes it a video caption tool that follows your watching habits instead of one platform's rules. The site puts the audience as learners and professionals watching content in more than 10 languages.

The main catch is that it's a Chrome extension. No standalone desktop app, no mobile build, so you're limited to Chromium browsers. Translation quality also depends on the AI model behind it. Casual speech with heavy slang or fast crosstalk can trip up any caption tool. Treat it as a strong reading aid, not a certified transcription service.

Getting Started

1. Open the Chrome Web Store and install the Overline extension, then pin it to your toolbar.
2. Sign in to your Overline account from the extension popup.
3. Open the video you want captioned in a browser tab and press play so audio is running.
4. Click the Overline icon and turn captions on, then pick your caption language or the language you want the speech translated into.
5. When you're done, open the saved transcript for that session and export it if you need a record.