About

FastSub AI is a free toolkit for people who work with subtitles: creators, translators, fansubbers, teachers and video editors.

Most subtitle tools upload your video to a server, charge per minute and add a watermark. We think that's unnecessary in 2026: modern browsers can run speech recognition, translation and video encoding on your own device.

Principles

• Your files never leave your device.
• Free, with no account and no limits.
• Honest about what runs where.