Bytley

AI Subtitle Generator

Turn any video or audio into subtitles with timestamps — edit the lines, then download .srt or .vtt. Free and private.

Drop a video or audio file here

Transcribed by AI on your device. Nothing is uploaded.

Works with videos and audio in 90+ languages (English is most accurate). Download as .srt for video players and YouTube, .vtt for the web, or plain text. Your file never leaves your device.

Frequently asked questions

Are my files uploaded to a server?

No. Everything is processed entirely inside your browser. Your files never leave your device or get sent anywhere.

Which file do I need for YouTube or a video player?

Download the .srt file — it works with YouTube uploads, VLC and almost every video editor. Use .vtt for websites.

How accurate is it?

It uses the Whisper speech AI running on your device. English is most accurate; 90+ other languages work too. You can click any line to fix the text before downloading.

Why does it take a few minutes?

The AI listens to the whole recording on your own device — that's what keeps it private and free. A 10-minute video typically takes a few minutes.