How to add subtitles to a video on your phone
From a raw clip to a captioned video in a few minutes, without a laptop or a video editor.
To add subtitles to a video on Android: open Subtightl, pick the video, tap Generate Subtitles to transcribe it, fix any word, choose a caption style, and export — the captions are burned into a new video you can post anywhere.
Real screens from the app.
Pick a video
Open Subtightl and choose a clip from your gallery. Vertical short-form clips are what it is made for.
Generate the captions
Choose the language spoken in the video and tap Generate Subtitles. Subtightl transcribes the speech; want English captions instead? Switch the caption language to English on the preview.
Fix any word
Tap a line to correct its words — names and slang are where automatic transcription slips.
Choose a style
Pick one of six designed looks, a colour and a size, and drag the captions up or down so they clear faces and the platform's buttons.
Export
Subtightl burns the captions into a new video at your clip's resolution and saves it to your gallery.
Post
Share it to Reels, TikTok, Shorts or anywhere — the captions are part of the video, so they show everywhere.
Tips for better captions
- Match the style to the video — Punch for a hook, Clean for an explanation, Soft for a story. All styles.
- Keep the bottom clear. Reels, TikTok and Shorts put their own text and buttons at the bottom and right — move your captions up.
- Check names and numbers before exporting; that is where automatic transcription slips.
- Why bother? Much of social video is watched muted — the numbers.
On iPhone? The iPhone version of Subtightl is coming soon.