Subtitles aren't optional anymore. 85% of Facebook videos are watched on mute, and every major platform rewards captioned content. Here's how to add them automatically.
Why Subtitles Matter
Accessibility
Required for deaf/hard-of-hearing viewers
Engagement
Captioned videos get 40% more views on average
SEO
Platforms index caption text for search
Sound-off viewing
Most social media is consumed on mute
Comprehension
Helps non-native speakers follow along
Best Auto-Subtitle Tools
Ekly
- Subtitles auto-generated during video creation
- No separate step — captions are part of the output
- Best for: videos created from scratch with AI
- Accuracy: High (generated from the script, not transcribed)
CapCut
- One-click auto-captions with style templates
- Great animated subtitle styles for social content
- Best for: TikTok and Reels creators
- Accuracy: 90-95%
Descript
- Transcription-based editing with subtitle export
- Edit captions by editing the text transcript
- Best for: podcast and interview content
- Accuracy: 95%+
Rev
- AI + human review option for maximum accuracy
- SRT/VTT export for any platform
- Best for: professional content requiring perfect accuracy
- Accuracy: 99% (with human review)
YouTube Auto-Captions
- Free, built into YouTube Studio
- Quality has improved significantly in 2025-2026
- Best for: YouTube-only content
- Accuracy: 85-92% (varies by audio quality)
Platform-Specific Tips
YouTube
- Upload SRT files for best results (don't rely solely on auto-captions)
- Use YouTube Studio to review and correct auto-generated captions
- Captions improve search ranking
Instagram Reels / TikTok
- Burn subtitles into the video (hardcoded) — these platforms don't support SRT
- Use large, readable fonts with high contrast
- Keep text in the center-safe zone (avoid edges)
- SRT upload supported
- Professional audience expects clean, accurate captions
- Avoid overly stylized fonts — keep it readable
- Supports SRT upload
- Auto-captions available but less accurate than dedicated tools
- Captioned videos autoplay with text visible, increasing engagement
Subtitle Style Tips
Font
Sans-serif, bold, high contrast (white text on dark background or with outline)
Size
Large enough to read on mobile
Position
Bottom-center or top-center (avoid covering important visuals)
Length
Max 2 lines, 42 characters per line
Timing
Sync to speech rhythm, not just timestamps
Common Mistakes
Not reviewing auto-generated captions
Always proofread, especially proper nouns
Too-small text
Test on a phone screen
Bad timing
Captions that lag or lead speech are distracting
Covering important visuals
Position captions carefully
Getting Started
If you're creating videos with Ekly, subtitles are generated automatically as part of the creation process. For existing videos, CapCut or Descript are the fastest options to add accurate captions.