Auto-Caption Your Videos
TikTok Style, For Free
Upload your video, pick a style, and download it with captions already added — word-by-word highlights included. Free, instant, no account needed.
MP4, MOV, WebM · Up to 500MB · English
Drop your video here
or click to browse · MP4, MOV, WebM · max 500MB
How It Works
Three steps. Zero uploads. Completely free.
STEP 1
Upload Your Video
Drop any MP4, MOV, or WebM file. Your video is processed locally — nothing ever leaves your device.
STEP 2
AI Adds Captions
Our AI listens to every word and places captions at exactly the right time — no manual syncing needed.
STEP 3
Customise & Download
Preview the captions live, tweak the color and style to match your brand, then download your captioned video.
Everything You Need for Viral Captions
Word-by-Word Highlighting
Each word lights up in your chosen color exactly as it is spoken — the TikTok karaoke look.
100% Private
Everything happens on your device. Your video is never uploaded to any server.
Fully Customisable
Pick any highlight color, adjust font size, and choose where the captions appear on screen.
ALL CAPS Toggle
One click switches to uppercase — the bold look that dominates Reels and TikTok.
Fast on Every Visit
The AI runs instantly after the first use. No waiting, no re-downloads.
Audio Stays Intact
Your original audio is preserved in the downloaded video — nothing is altered.
Frequently asked questions.
Everything you need to know about the free AI video caption generator.
Is this video caption generator really free?
100% free, no signup, no watermark. Captions are generated and burned into your video entirely in your browser.
Is my video uploaded to a server?
No. Everything runs locally on your device using Whisper AI in the browser — your video never leaves your computer.
What video formats are supported?
MP4 (H.264/H.265), WebM (VP8/VP9), MOV (QuickTime), MKV and most browser-decodable formats. Maximum file size is 500MB.
Can I customise the caption style?
Yes. Pick any highlight colour, adjust font size, choose top/center/bottom position, toggle ALL CAPS and tweak caption pacing.
What languages are supported?
English transcription is currently supported using the Whisper-tiny model optimised for in-browser performance.
Why is the first run slower?
The AI model downloads once on first use and is cached for instant performance on every return visit.
Will my original audio be preserved?
Yes. The original audio track from your video is preserved untouched in the exported file.
Can I use the captioned video commercially?
Yes. The tool is free for personal and commercial use — post your captioned videos on TikTok, Reels, Shorts or paid ads with no restrictions.
Want AI-generated videos too?
Shhots AI generates full product video ads from a single image — no filming, no editing. Add auto-captions and you're ready to post.
About
Free AI video caption generator.
Auto-captions in seconds
Shhots AI's free video caption generator auto-transcribes any clip with Whisper AI and burns word-by-word captions directly into the video. No signup, no watermark, no subscription — forever free.
100% private — nothing uploaded
Everything runs locally in your browser. Your video never leaves your computer — ideal for sensitive client work, unreleased product footage and confidential creator content.
TikTok-style karaoke captions
Word-level highlight that pops with each spoken syllable — the same animated caption style trending on TikTok, Reels and YouTube Shorts. Pick any colour, font size and position.
Every major video format
Supports MP4 (H.264/H.265), WebM (VP8/VP9), MOV (QuickTime), MKV and most browser-decodable formats up to 500MB. Output is a clean MP4 ready for any social platform.
Customise everything
Highlight colour, font size, top/center/bottom position, ALL CAPS toggle, caption pacing and word-grouping — dial in the look that matches your brand or creator style in seconds.
Plug into the full creative pipeline
Caption clips from the AI video generator, image to video, faceless AI video generator, the Facebook ad video maker or the AI UGC ads generator for fully social-ready creatives.