Add Subtitles to Video

Instantly add captions to any video using advanced AI. This is a 100% free online auto subtitle generator that runs entirely inside your local browser. No sign-up required, zero server uploads, and your video files never leave your device.

100% Free
No sign-up
Video never leaves your device

A smarter way to add subtitles to video online

We rebuilt the subtitle workflow from the ground up using first-principles thinking. Traditional tools force you to upload heavy files and pay subscription fees. Our platform leverages the power of your local browser to add captions to video securely, quickly, and entirely for free.

100% Private: Zero Server Uploads

Your privacy is our absolute priority. This tool processes everything locally using advanced hardware acceleration technology. When you add subtitles to video here, your files are never uploaded to any cloud server. The video never leaves your device, making it the most secure way to process sensitive or personal content.

Powerful AI Auto Caption Generator

Forget manual typing. Our integrated AI subtitle generator automatically transcribes spoken audio into accurate text in seconds. You can choose between our highly accurate Standard Model for professional results, or the lightning-fast Fast Model optimized for slower networks and older devices.

Export Hardcoded Video or SRT

Whether you need a standalone subtitle file or a ready-to-publish clip, we have you covered. You can easily download a standard SRT file for professional editing software, or choose to export a new MP4 video with subtitles burned directly into the footage.

How to add subtitles to a video for free

Follow these three simple steps to generate and edit subtitles directly in your browser.

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1. Select or drop your video

Simply drag and drop your media file into the workspace. Because this is a local browser tool, there are no annoying upload wait times or strict file size limits typically found in other online subtitle generators.

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2. Auto-generate and edit captions

Click generate and let our AI model scan the audio track. The auto caption generator will create precise text blocks on an intuitive timeline. You can easily click on any block to correct misspellings, adjust timings, or customize the text color and background style.

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3. Export your subtitled video

Once you are satisfied with the text and styling, click export. You can instantly download a high-quality MP4 with hardcoded subtitles, ensuring your captions display perfectly on any social media platform, or grab the SRT file for later use.

Intuitive dual-track editing timeline

We designed a minimalist, professional interface that removes the complexity of video editing. You don't need to understand complex SRT formatting to add subtitles to video. Our clean geometric layout lets you focus entirely on your content.

The primary video track provides real-time playback and accurate visual previews of your customized subtitle styles.
The secondary subtitle track displays AI-generated text blocks, allowing for instant drag-and-drop timing adjustments.
Seamlessly switch between SRT extraction or rendering a full subtitled video with just one click.
Visual Preview Track
Real-time playback and style rendering
Interactive Subtitle Track
Click, edit, and adjust text timing instantly
Flexible Export Options
Burned-in MP4 or standalone SRT files

Frequently Asked Questions

Is it really free to add subtitles to video online?

Yes, it is 100% free. Because our AI subtitle generator runs locally within your browser's engine, we don't have massive server costs. We pass those savings directly to you, meaning no hidden fees, no subscriptions, and no paywalls.

Are my videos safe? Do you store my files?

Your videos are completely safe because they never leave your computer. Our platform uses advanced local processing, meaning the video file is read and processed directly on your device. We do not store, view, or upload your media to any external servers.

Do I need to sign up or create an account?

Absolutely not. We believe in removing friction. You can add captions to video immediately upon visiting the site without entering an email, creating a password, or dealing with annoying sign-up forms.

Will there be a watermark on my exported video?

No. When you export your final MP4 using our subtitle generator, the output video will be completely clean and free of any intrusive platform watermarks.

How accurate is the auto caption generator?

Our tool utilizes state-of-the-art AI speech-to-text technology. It provides highly accurate transcriptions for clear audio. However, you always have full control to manually edit and refine the text on our intuitive timeline before exporting.

Should I download an SRT file or a subtitled video?

If you plan to upload your video to YouTube and want users to be able to toggle closed captions on and off, download the SRT file. If you are posting to TikTok, Instagram Reels, or X (Twitter) where captions should always be visible, choose to download the subtitled video (hardcoded MP4).