Free AI Caption Generator for TikTok & Reels
Captions are the single biggest lever for watch time on short-form video — most people scroll with the sound off. Here's how to add auto-synced, word-by-word captions to any clip for free, with no sign-up and no watermark.
Why captions matter so much
Studies of short-form feeds keep showing the same thing: captioned videos hold attention longer and get watched to completion more often. On a muted feed, your words are your video. Word-by-word captions that pop in sync with the voice also add motion, which keeps thumbs from scrolling.
The catch is that typing and timing subtitles by hand is painfully slow. An AI caption generator does it in seconds.
How to add AI captions for free
Open Shortify
Go to Shortify — it runs in your browser, so your clip never uploads anywhere.
Add your video
Drop in the clip you want captioned (or a longer video to cut into pieces first).
AI transcribes & times every word
The built-in speech AI writes the captions and syncs them word-by-word to the audio — no typing, no manual timing.
Pick a caption style
Choose from 60+ styles: clean white, karaoke, neon, boxed, bold "beast" pops, animated float/bounce and more. Preview updates instantly.
Download — captions burned in
Your clip downloads with captions baked into the video (not a separate file), ready for TikTok, Reels or Shorts. No watermark.
✂️ Caption a video now — free
Auto word-by-word captions, 60+ styles, no watermark, no login.
Open Shortify free →Tips for captions that convert
- High contrast wins. Bold white with a black outline, or a boxed style, reads on any background.
- 1–2 words per line. Big, punchy words beat long sentences on a small screen.
- Match the vibe. Comedy? Try Comic or Bubblegum. Hype? Beast or Neon. Clean talking-head? Minimal.
- Keep them low but not cut off. Leave room for the platform's UI at the very bottom.
FAQ
Is it really free with no watermark?
Yes — every caption style and unlimited exports are free, with no watermark and no account.
Do the captions sync automatically?
Yes. The AI times each word to the audio, so captions appear exactly as they're spoken.
Can I edit the caption style per clip?
Yes — pick any of the 60+ styles and re-render, or change it per clip before download.