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Add Subtitles to Video

Drop video here or click to upload

Supports MP4, WebM, MOV | Then upload SRT/VTT subtitles

Why Use Our Subtitle Tool?

100% Private

Video is processed entirely in your browser. Nothing is uploaded to any server.

Instant Start

No library loading required. Start processing immediately.

Customizable Style

Choose font size, colors, and position to match your needs.

SRT & VTT Support

Works with the most common subtitle formats.

Frequently Asked Questions

What's the difference between SRT and VTT?
Both are text-based subtitle formats. SRT is the most common and compatible format. VTT (WebVTT) is used for HTML5 videos and supports more styling options.
What does "burn subtitles" mean?
Burning subtitles means embedding them permanently into the video frames. Unlike soft subtitles that can be toggled on/off, burned subtitles are always visible.
Can I customize how subtitles look?
Yes! You can customize font size, text color, background color, background opacity, and position (top or bottom of the video).

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About Video Subtitle Tool

Add subtitles to video online free with FreeToolBox — burn SRT or VTT subtitle files directly into your video as hardcoded captions using FFmpeg.wasm, all in your browser. Hardcoded subtitles are embedded permanently into video frames, ensuring they appear on any device or platform — perfect for social media videos, accessible content, and foreign language videos. Upload your video and subtitle file, choose font style and size, and download the subtitled video.

All processing happens locally in your browser — your video and subtitle files never leave your device. No watermarks are added. Completely free, no account required.

Frequently Asked Questions

What is the difference between hardcoded and softcoded subtitles?

Hardcoded subtitles are permanently burned into the video image — they can't be turned off. Softcoded subtitles are a separate track that players can show or hide. This tool creates hardcoded subtitles, ideal for social media where separate subtitle tracks aren't supported.

What subtitle formats are supported?

SRT (SubRip Text) and VTT (WebVTT) formats are supported. SRT is the most common subtitle format and can be created with any text editor.

Can I change the subtitle font and size?

Yes. Adjust font size, choose text color, and select subtitle position (bottom or top of frame) before export.

Are my video and subtitle files uploaded to a server?

No. FFmpeg.wasm processes everything locally in your browser. Neither your video nor your subtitle file is sent to any external server.

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