Caption Studio

Add captions to video in your browser

Upload a video, transcribe it, style your captions, and download the finished MP4.

UploadTranscribeStyleExport MP4

Caption workflow

Upload & transcribe

Up to 10min, 250MB

Free — runs in your browser. Exported video includes a small watermark.

Waiting for video

Upload a video to begin.

Caption style

6 presets
Style & layout controlsAuto-fit enabled
Caption box behavior

Auto-fit keeps captions responsive. Manual mode lets you place and resize the caption box directly.

Font size
56px
Words per line
3
Auto width
74%
Auto vertical position
Low

How to Add Captions to a Video

1

Upload Your Video

Select any video file from your device. We support MP4, MOV, WebM, and other common formats up to 10 minutes long.

2

Generate & Style Captions

AI transcribes the speech automatically. Pick from multiple caption presets, then fine-tune fonts, colors, and positioning.

3

Export with Captions

Download the finished MP4 with captions burned in. The video is rendered in your browser. Premium transcription exports without a watermark.

Why Use Our Caption Generator?

AI-Powered Transcription

State-of-the-art speech recognition transcribes your video automatically with high accuracy. No manual typing required — just upload and let AI do the work.

Custom Caption Styles

Choose from multiple built-in presets or fully customize fonts, sizes, colors, and positioning. Make your captions match your brand or content style perfectly.

Direct MP4 Export

Captions are burned directly into the video and exported as MP4. No separate subtitle files to manage — your captioned video is ready to share on any platform.

Frequently Asked Questions

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Try the Editor

Adding captions to your videos is one of the most effective ways to improve accessibility and reach a wider audience. Our free online caption generator uses advanced AI speech recognition to automatically transcribe spoken words into timed subtitles that appear on screen. Unlike traditional subtitle workflows that require importing SRT or VTT files and syncing them manually, our tool handles the entire process — from transcription to styling to final export — in a single streamlined interface. The caption styles are fully customizable: choose from preset designs optimized for social media platforms like TikTok, Instagram Reels, and YouTube Shorts, or fine-tune fonts, colors, sizes, and positioning to match your brand. Once you're satisfied with the look, the captioned video is rendered directly in your browser as an MP4 file with the subtitles permanently burned in. This means your captions will display correctly on every device and platform without relying on external subtitle tracks. Whether you're a content creator looking to boost engagement, a business producing training videos, or someone who wants to make their content more inclusive for viewers who are deaf or hard of hearing, our caption tool keeps the process fast with browser-first and premium server transcription options.