How accurate are auto-generated subtitles?

Modern AI subtitle tools are 95–99% accurate for clear audio. Accuracy depends on audio quality, accents, and background noise. Always review before publishing.

What is the difference between open and closed captions?

Open captions (burned-in) are part of the video and always visible. Closed captions are a separate file that viewers can toggle on/off. Social media typically uses open captions.

Which subtitle style is best for social media?

Word-by-word karaoke highlighting is the top performer on TikTok and Reels. For YouTube, clean bold text with a subtle background works best.

Guide

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How to Add Subtitles to Videos Automatically (Step-by-Step)

Adding subtitles manually is tedious and time-consuming. AI auto-subtitle tools transcribe, time, and style your captions in seconds. Here is how to use them for maximum impact.

Last updated: February 23, 2026

Step-by-Step Guide

Upload your video

Import your video file into FluxNote. The AI begins processing the audio track immediately.

Review auto-transcription

Check the AI-generated transcript for accuracy. Fix any misheard words or names.

Choose a subtitle style

Select from 25+ styles including karaoke, pop-up, highlighted, and minimalist options.

Customize appearance

Adjust font, color, size, and position. Ensure readability on mobile screens.

Export for your platform

Export with hardcoded subtitles for social media or download SRT/VTT files for YouTube.

Why automatic subtitles are a game-changer

Manual subtitling takes 5–10x the length of the video to complete. For a 60-second video, that is 5–10 minutes of tedious typing and timing. For a 10-minute video, it could take over an hour.

AI auto-subtitling does this in seconds. The technology transcribes your audio, timestamps every word, and generates perfectly synced captions automatically.

The quality has improved dramatically too. Modern AI transcription is 95–99% accurate, handling accents, fast speech, and technical terms with ease.

Step-by-step guide

Step 1: Upload your video. Import your video file into FluxNote. The AI immediately begins processing the audio track.

Step 2: Wait for auto-transcription. FluxNote transcribes the entire video with word-level timing in seconds. Review the transcription for accuracy.

Step 3: Select a subtitle style. Choose from 25+ animated styles — karaoke, pop-up, highlighted, neon, minimalist, and more.

Step 4: Customize positioning and colors. Adjust where subtitles appear on screen. Change font, size, color, and background to match your brand.

Step 5: Export with burned-in subtitles. Export with subtitles hardcoded into the video for social media, or download SRT/VTT files for platforms that support closed captions.

Tips for best results

- Always review the transcription — fix any errors before applying styles
- Use contrasting colors — subtitles must be readable over any background
- Keep font size large enough for mobile viewing — at least 40px for short-form video
- Avoid placing subtitles at the very bottom on TikTok and Reels — UI elements overlap there
- Match style to platform — bold animated styles for TikTok, clean styles for YouTube

Common mistakes to avoid

- Publishing without reviewing — even great AI makes occasional mistakes
- Using tiny text — if viewers cannot read captions on a phone, they will scroll away
- Choosing distracting animations — subtitles should enhance, not compete with, your content
- Ignoring platform safe zones — each platform has different UI overlays
- Not using subtitles at all — skipping captions means losing 85% of potential viewers who watch on mute

Pro Tips

Always review AI transcriptions before exporting
Use contrasting colors so subtitles are readable over any background
Keep font size at least 40px for mobile-friendly viewing
Avoid placing captions where platform UI elements overlap
Match subtitle style to your content type and target platform