On-Device Whisper AI
Transcribe video speech directly on your phone without sending recordings to a cloud service.
Offline AI Auto Captions
Offline AI Auto Captions
Create accurate subtitles and engaging captioned videos directly on your Android phone with on-device Whisper AI.
Android App • On-Device AI • Free with Ads
Caption Videos on Android
Download the app and create up to three free captioning projects every day without watermarks.
Captions Made for Mobile Creators
Offline AI Auto Captions turns speech into accurate subtitles using Whisper AI on your Android device. Edit the transcript, adjust caption timing down to the millisecond, style the text, and render a finished MP4 video with hardcoded captions.
The free experience includes up to three daily projects without intrusive video watermarks. You can also export standard SRT and WebVTT subtitle files for YouTube, editing apps, and other publishing workflows.
From Video to Captioned Export
- Choose a video: Select a clip from your Android device.
- Transcribe on-device: Let Whisper create the initial subtitle text.
- Edit and style: Split, merge, retime, and customize the caption appearance.
- Export: Render an MP4 with hardcoded captions or save SRT and WebVTT subtitles.
Core Features
Smart Caption Editor
Split, merge, and adjust caption timings with fine control down to the millisecond.
Caption Style Studio
Design readable, engaging captions that help viewers follow and enjoy short-form video.
Hardcoded MP4 Export
Render a finished video with styled captions permanently included in the picture.
SRT and WebVTT Export
Export standard subtitle files for YouTube, editing applications, and other platforms.
No Free Watermarks
Create up to three free captioning projects every day without intrusive watermarks.
Free and Pro Features
Included Free
- Up to three captioning projects per day
- On-device Whisper transcription
- Smart caption editing and timing controls
- Styled hardcoded MP4 captions
- SRT and WebVTT subtitle export
- No intrusive video watermarks
Pro Upgrade
- Batch processing for up to ten videos at once
- Faster repeat captioning workflows
- Extended production for frequent creators
- Designed for larger content workloads
- Keep the same private, on-device workflow
App Screenshots
Mobile captioning workspace
Caption editing workflow
Caption style controls
Video and subtitle export
Made for Fast Mobile Publishing
- Short-form creators: Add readable captions to social videos and reels.
- Educators: Make lessons and explainers more accessible with accurate subtitles.
- Travel and lifestyle creators: Caption clips directly from your phone while on the move.
- Privacy-conscious users: Keep source videos and transcription work on the Android device.
Frequently Asked Questions
Is the app free?
Yes. The app is free with ads and includes up to three captioning projects every day.
Does it upload my videos?
No. Caption transcription uses on-device Whisper AI, so your videos can stay on your Android device.
Can I export subtitle files?
Yes. You can export standard SRT and WebVTT subtitle files in addition to rendering a captioned MP4 video.
Can I change caption timing?
Yes. The editor lets you split, merge, and adjust caption timings down to the millisecond.
What does Pro add?
Pro unlocks batch processing for captioning up to ten videos at the same time and supports larger repeat-production workloads.
Make Every Mobile Video Easier to Follow
Create private, polished captions directly from your Android phone.