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Whisper Web
Free AI Captions Generator

Generate Captions Free — AI-Powered Closed Captions Generator

Whisper Web creates accurate video captions for social media, accessibility, and closed captioning. This auto captions generator is powered by OpenAI Whisper, processed 100% in your browser with no audio uploaded to any server. No watermarks, no account required for local use.

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Why Use Whisper Web to Generate Captions

AI Auto Captions Generator

Leveraging OpenAI Whisper, our AI captions generator delivers near human-level accuracy. Handles accents, background noise, and fast speech with ease — no expensive subscription required.

Captions for Social Media

Generate captions formatted for YouTube closed captions, TikTok auto-captions, Instagram Reels, and other social platforms. Video captions boost engagement by up to 80% and improve reach.

Closed Captions for Accessibility

Create closed captions that meet ADA, WCAG, and FCC accessibility standards. Our closed captions generator makes your content inclusive for deaf and hard-of-hearing audiences.

Generate Captions in 100+ Languages

Generate video captions free in English, Spanish, French, German, Japanese, Chinese, Korean, Arabic, and 100+ other languages for global audiences.

Private & Secure — No Uploads

Unlike other caption generators, your video and audio never leave your device. All caption generation runs locally in the browser using WebAssembly and WebGPU. Zero data collection.

SRT & VTT Caption Export

Export your captions as SRT files for YouTube or VTT files for web players. Download instantly — no email, no account, no watermarks.

How to Generate Captions for Video

1

Upload Video or Audio

Drag and drop your video or audio file. Supports MP4, MOV, WebM, MP3, WAV, M4A, and many more formats.

2

AI Generates Captions Locally

The Whisper AI model runs entirely in your browser. Your file stays on your device while the auto captions generator creates captions segment by segment during processing.

3

Review Your Captions

Preview the generated captions with timestamps. Check accuracy and make any edits before exporting.

4

Export SRT or VTT Captions

Download your caption file in SRT format for video editors and YouTube, or VTT format for web-based players. No watermarks.

Popular Caption Generator Use Cases

YouTube closed captions for better SEO and accessibility compliance
TikTok auto-captions to increase viewer engagement and watch time
Instagram Reels and Stories captions for sound-off viewing
E-learning and online course video captions for students
Corporate and training video closed captions for compliance
Podcast episode captions for video clips and social sharing
Live event and webinar recording captions for archiving
ADA and WCAG accessibility compliance for public-facing media

Frequently Asked Questions

How do I generate captions for a video for free?
Upload your video or audio file to Whisper Web by dragging and dropping it into the browser. The AI auto captions generator processes your file locally on your device and creates accurate, timestamped captions. Export as SRT or VTT — no account needed, no watermarks, local mode currently free. The entire process takes just a few minutes.
What is the difference between captions and subtitles?
Captions (also called closed captions) are designed for viewers who cannot hear the audio — they include speaker identification, sound effects, and music descriptions. Subtitles assume the viewer can hear but may not understand the spoken language. Whisper Web generates timed text from speech that works for both captions and subtitles, exported as standard SRT or VTT files.
How do I add AI captions to a YouTube video?
Use Whisper Web to generate captions and export as an SRT file. In YouTube Studio, go to your video's Subtitles section, click 'Add language', then 'Upload file' and select your SRT file. YouTube will sync the closed captions to your video automatically. This free method gives you more control and accuracy than YouTube's built-in auto-generated captions.
How accurate is the AI captions generator?
Whisper Web's AI captions generator achieves near-human accuracy on clear audio — often exceeding 95% for English. It uses OpenAI Whisper, one of the most accurate speech recognition models available. Accuracy depends on audio quality: clear speech with minimal background noise produces near-perfect results. For noisy recordings or heavy accents, try a larger Whisper model (Small or Medium). We recommend reviewing captions before publishing.
Is this closed captions generator really free?
Yes, local mode is currently free with no account required. Unlike caption generators like TurboScribe (limited to 3 free per day), Kapwing (watermarks on free tier), or Rev (charges per minute), Whisper Web runs locally on your device with no server costs and no watermarks on exported files.
Can I generate captions in multiple languages?
Yes. Whisper Web supports 100+ languages including English, Spanish, French, German, Japanese, Chinese, Korean, Arabic, and Hindi. Select the spoken language of your content or use auto-detection. The AI generates captions in the language spoken — for translated captions, run the output through a translation tool.

Related Tools

Video to TextExtract text from video files — MP4, WebM, MOV and more.Social Media CaptioningCreate captions for TikTok, Instagram Reels, YouTube Shorts and more.Audiobook CaptioningGenerate captions and transcripts from audiobook recordings.YouTube to TextTranscribe YouTube videos to text — just paste the URL.Audio TranslatorTranscribe and translate audio from 100+ languages to English.

Generate Video Captions Free — No Watermarks, No Signup

Create professional closed captions in minutes. Our AI captions generator is private and runs entirely in your browser. No account required for local use.

Generate Captions Now