Captioner.io

Captioner is a subtitle platform designed for creators who value precision. Upload an MP4 or MOV file and receive highly accurate speech-to-text in over 98 languages. Timestamps are aligned with the video, providing more than just raw transcripts. Word-level timing and precise line breaks minimize editing and ensure a seamless workflow.

It is built to integrate into existing creator processes. Import a transcript and automatically synchronize it to your video (similar to YouTube auto-sync, but more refined), then make adjustments using an editor designed specifically for subtitles. Once finished, export in SRT, VTT, or SBV format for your editor, or embed captions directly into the video in your preferred style, up to 4K resolution.

Captioner also offers quick translation (currently English to Mandarin Chinese in Express) and supports long videos of up to 3 hours, with unlimited total minutes. It prioritizes accuracy, reducing the time spent correcting errors and increasing publishing efficiency.