Is CaptionAI really free?

Yes, CaptionAI is completely free to use. There are no hidden fees and no watermarks. Sign in with Google to unlock 500MB uploads and 5 free transcriptions.

What languages does CaptionAI support?

CaptionAI supports 99+ languages and accents including English, Spanish, Hindi, French, German, Portuguese, Chinese, Japanese, Korean, Arabic, and many more.

What file formats are supported?

CaptionAI supports all major video and audio formats including MP4, MOV, MP3, WAV, WEBM, AVI, and more. Files up to 500MB are supported. Video files are automatically compressed in your browser before upload.

Is my data private and secure?

Yes. Your files are processed and immediately deleted from our servers. We never store, share, or sell your data. Video compression happens entirely in your browser.

How accurate are the generated captions?

CaptionAI uses advanced AI speech recognition powered by OpenAI Whisper to achieve up to 99% transcription accuracy across supported languages.

Can I use the SRT file with YouTube, Premiere Pro, or Final Cut?

Yes. The SRT (SubRip) format is the industry standard for subtitles. It works with YouTube, Premiere Pro, Final Cut Pro, DaVinci Resolve, CapCut, VLC, and virtually every video editor and platform.

How do I add subtitles to my YouTube video?

Upload your video to CaptionAI, download the generated SRT file, then go to YouTube Studio > Subtitles > Add Language > Upload File > select your SRT file. YouTube will automatically sync the captions with your video.

Can I generate captions for TikTok and Instagram Reels?

Yes. Upload your short-form video to CaptionAI and download the SRT file. You can then import the SRT into CapCut, InShot, or any mobile editor to burn subtitles directly onto your TikTok or Instagram Reel before posting.

Does CaptionAI work for podcasts and audio files?

Absolutely. CaptionAI works with MP3, WAV, and other audio formats. It's ideal for transcribing podcasts, interviews, lectures, and audiobooks into text with accurate timestamps.

What is an SRT file and why do I need one?

SRT (SubRip Text) is the most widely used subtitle file format. It contains timestamped text that video players and editors use to display captions. You need an SRT file to add subtitles to videos on YouTube, social media, or any video editing software.

CaptionAI — Free AI Caption & Subtitle Generator for Video

Generate accurate captions and subtitles for your videos instantly with AI. CaptionAI is a free, private, no-signup-required tool that transcribes any video or audio file into an SRT subtitle file using OpenAI Whisper speech recognition.

Features

99+ language support — English, Spanish, Hindi, French, German, Chinese, Japanese, Korean, Arabic, and more
SRT subtitle file export — compatible with YouTube, Premiere Pro, Final Cut Pro, DaVinci Resolve, CapCut
100% private — your files are processed and immediately deleted, never stored or shared
In-browser video compression — only the audio track is uploaded, saving up to 95% bandwidth
Supports MP4, MOV, MP3, WAV, WEBM, AVI — files up to 500MB

How to Generate AI Captions for Your Video

Upload your file — drag and drop or browse to select any video or audio file up to 500MB
AI transcription — CaptionAI extracts audio and uses OpenAI Whisper to transcribe with 99% accuracy
Download SRT — get your subtitle file ready for YouTube, TikTok, Instagram, Premiere Pro, or any editor

Use Cases

Add subtitles to YouTube videos for better engagement and accessibility
Generate auto captions for Instagram Reels and TikTok for wider reach
Transcribe podcasts and interviews into text with accurate timestamps
Create subtitles for online courses and educational content
Add captions to corporate training videos and webinars

Frequently Asked Questions

Is CaptionAI really free?: Yes, CaptionAI is completely free to use. No hidden fees, no watermarks. Sign in with Google for higher upload limits.
What languages does CaptionAI support?: CaptionAI supports 99+ languages including English, Spanish, Hindi, French, German, Portuguese, Chinese, Japanese, Korean, Arabic, and many more.
How do I add subtitles to my YouTube video?: Upload your video to CaptionAI, download the SRT file, then go to YouTube Studio > Subtitles > Upload File to add captions.
Can I generate captions for TikTok and Instagram Reels?: Yes. Download the SRT file from CaptionAI and import it into CapCut or InShot to burn subtitles onto your short-form video.
What is an SRT file?: SRT (SubRip Text) is the industry-standard subtitle format. It contains timestamped text used by YouTube, Premiere Pro, Final Cut Pro, DaVinci Resolve, VLC, and virtually every video platform.

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