Subtitle generator free auto subtitles, SRT & VTT

By ShinobiTools Team · Last updated: 28 September 2026

Upload a video and this auto subtitle generator writes and times every line for you. Download SRT and VTT files for YouTube, CapCut, Premiere, DaVinci or any player. Free, no sign-up, no watermark.

MP4, MOV, MKV, WEBM and more, up to 60 minutes and 1.5 GB. The spoken language is detected automatically; you also get a plain-text transcript.

No sign-up. 10 videos a day. Files up to 60 minutes free, 4 hours with a pass. No watermark on the subtitle files.

How the auto subtitle generator works

We take the audio track out of your video, a speech model transcribes it, and every line gets a start and end time. The result is a ready-to-use subtitle file: nothing to type and nothing to time by hand. It is an AI subtitle generator in the plain sense: the words come from the audio, not from a template.

SRT for YouTube, CapCut, Premiere, DaVinci Resolve and VLC.
VTT for web players and the HTML5 <track> tag.
TXT with just the words, if you also need a transcript.

A caption generator for video

"AI caption generator" is used for two different things. This one makes captions of what is said in a video, like the subtitles on YouTube or TikTok. It does not write the caption text for an Instagram or TikTok post. Subtitles and captions come out as the same SRT/VTT files here.

What it does not do

Styled or animated captions. SRT and VTT are plain text tracks; styling happens in your editor or player.
Burned-in subtitles on this page. For subtitles that are part of the picture, use burn subtitles into video.
Pulling out a subtitle track a video already has. The spoken audio is transcribed fresh.

Auto subtitle generator free: the limits

Free, no sign-up: files up to 60 minutes and 1.5 GB, 10 a day, results kept 45 minutes.
Free monthly pass (email): files up to 4 hours, 25 a day, results kept 24 hours.
ShinobiTools pass: files up to 4 hours, 50 a day, results kept 24 hours, plus Word export, meeting notes and speaker names.

How to add the subtitles

Drop the video in the box above and wait a few minutes.
Download the SRT (or VTT).
YouTube: Studio → Subtitles → Upload file. Editors: import the SRT as a caption track. Players: put the SRT next to the video with the same file name.

Step-by-step for each app: add subtitles to YouTube, CapCut, Premiere, DaVinci and VLC. Subtitles in another language: translate subtitles. Just want the text? Video to text. Picture too soft? The video quality enhancer on VideoBGNinja sharpens small clips.

Frequently asked

Is the subtitle generator free?

Yes: 10 videos a day, up to 60 minutes and 1.5 GB each, with no sign-up and no watermark on the subtitle files.

SRT or VTT: which do I need?

SRT for YouTube and most editors, VTT for web players. You get both. See SRT vs VTT for the details.

Is this an AI caption generator for Instagram posts?

No. It makes captions of what is said in a video. It does not write the text for a social media post.

Can I burn the subtitles into the video?

The files here are separate subtitle tracks. To put them permanently into the picture, use burn subtitles into video.

Which languages does it support?

Most major languages, detected automatically. To get subtitles in another language, use translate subtitles.

Can I edit the subtitles?

Yes, in any subtitle editor or video editor after you download them. There is no editor on this page.

What happens to my video?

The upload is deleted right after processing and the subtitles are wiped within 45 minutes (24 hours with a pass). See privacy.