How To
How to Export Captions as MP4
Render a clean MP4 with burned-in captions — up to 4K, no watermark, straight from your browser.
Step-by-Step Instructions
- 1
Finish styling your captions
Make sure your captions look exactly how you want them in the live preview. Check font, colors, effects, and positioning. What you see in the preview is what you get in the exported video.
- 2
Click the export button
Open the export dialog from the toolbar. You will see resolution options ranging from Quick Preview to 4K. Each option shows the output dimensions and relative rendering speed.
Tip: Quick Preview renders fastest and is great for checking your work. Use Standard HD for most social media uploads and 4K only when your platform supports it.
- 3
Wait for rendering to complete
The tool renders your video frame by frame in your browser using Remotion. A progress bar shows rendering status. Standard HD exports typically complete in 30 seconds to 2 minutes depending on video length and your device speed.
- 4
Download your MP4
When rendering finishes, the MP4 file downloads automatically. The file is a standard H.264 MP4 that plays on any device and uploads to any platform. Captions are permanently composited into the video — no separate subtitle file needed.
01
Burned-In Captions vs. Subtitle Files
There are two ways to add text to video: burned-in captions and separate subtitle files (SRT, VTT). Burned-in captions are rendered directly into the video frames, becoming a permanent part of the image. Subtitle files are separate text documents that video players overlay on top of the video. Each approach has trade-offs. Burned-in captions give you complete visual control — custom fonts, colors, animations, and positioning that look exactly the same on every device and platform. They cannot be turned off or reformatted by the viewer, which ensures your styling is preserved. Subtitle files are more flexible — they can be translated, reformatted, and toggled by viewers — but they render differently across platforms and give you limited styling control. For social media content, burned-in captions are the clear winner because platforms like Instagram, TikTok, and Twitter do not support external subtitle files. VideoCaptions.AI exports burned-in captions as MP4, giving you a single file ready for any platform.
02
Understanding Export Resolution Options
VideoCaptions.AI offers three export tiers to match your needs. Quick Preview renders at reduced resolution and is designed for rapid iteration — check how your captions look in a real video file without waiting for a full render. It produces smaller files with lower quality, perfect for sharing draft versions with collaborators or previewing on your phone before committing to a full export. Standard HD exports at 1080p, which is the optimal resolution for social media platforms. Instagram Reels, TikTok, YouTube, and Facebook all display at 1080p or lower, so this resolution provides full quality without the extra rendering time of higher resolutions. File sizes are manageable for quick uploads. The 4K option renders at 2160p for platforms and use cases that benefit from ultra-high resolution. YouTube supports 4K playback, and some professional workflows require the highest possible quality. 4K rendering takes significantly longer and produces larger files, so use it only when the extra resolution matters for your specific output.
Frequently Asked Questions
Everything you need to know before you start.
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No. Every export from VideoCaptions.AI is completely clean with no watermarks, no logos, and no branding of any kind. The exported MP4 contains only your video content with your styled captions. There is no premium tier needed for watermark-free exports.
Exports use H.264 in an MP4 container, which is the most widely compatible video format. The file plays on virtually every device, browser, and platform. H.264 is the codec required or recommended by Instagram, TikTok, YouTube, Facebook, and most other social platforms.
Rendering time depends on video length, resolution, and your device speed. A 30-second Standard HD export typically takes 30 seconds to 1 minute on a modern laptop. 4K exports take longer. Quick Preview renders in seconds. All rendering happens locally in your browser.
Yes. You can export your project as many times as you want at different resolutions. Export a Quick Preview first to check your work, then export Standard HD for social media. Each export is independent and does not affect your project or previous exports.