Video Caption Formatter
Paste any transcript and download a ready-to-use SRT file. Works for YouTube, TikTok, and Reels.
Short — good for TikTok and Reels
Standard — YouTube recommended width
Why captions matter
Adding captions isn't just an accessibility checkbox — it's one of the highest-leverage improvements you can make to any video.
70% watch silently
Most social video plays without sound. Captions on autoplay content — TikTok, Reels, YouTube Shorts — are the difference between a watch and a scroll.
Captions = searchable
YouTube indexes your caption text as video content. Keywords in your captions improve search ranking, exactly like body text improves a web page's position.
Accessibility ranks
Google rewards accessible content. Captions serve deaf and hard-of-hearing viewers — and that same signal tells algorithms your content is high quality.
Frequently asked questions
What is an SRT file?
SRT (SubRip Subtitle) is the most widely supported caption file format. It contains sequential numbered caption blocks, each with a timecode range and the text to display. YouTube, TikTok, Premiere Pro, DaVinci Resolve, and virtually every video platform or editor accepts .srt files. It's plain text — you can open and edit it in any text editor.
How do I add SRT captions to YouTube?
In YouTube Studio, open your video and click "Subtitles" in the left menu. Click "Add" next to your language, then choose "Upload file" and select your .srt file. YouTube will automatically sync the timecodes. For TikTok, upload the video normally and use the "Captions" option during editing to upload an external SRT file.
What's the ideal caption length per line?
For YouTube and most video platforms, 42 characters per line is the recommended maximum — it avoids overflow on standard 16:9 displays. For vertical content (TikTok, Reels, Shorts), 32 characters keeps captions readable on mobile screens. 6–8 words per caption is ideal for most narration speeds; drop to 4 words for fast-paced content.
Do captions affect YouTube SEO?
Yes — YouTube indexes the text in your captions as part of the video's content. This means the words in your captions contribute to keyword matching in search results, the same way body text affects web page ranking. Accurate captions with relevant keywords improve your video's discoverability for long-tail searches. Auto-generated captions are less accurate, which can dilute keyword relevance compared to a clean uploaded SRT.
How does Leaxor handle captions?
Leaxor automatically generates captions from the script and burns them directly into the video export — no SRT file needed, no upload step. Burned-in captions are always visible regardless of the viewer's caption settings, which is especially important for autoplay content on TikTok and Reels where audio is often off. This is different from a separate .srt file, which relies on the viewer enabling subtitles.
Want auto-captions built into your video?
Leaxor burns captions into every video automatically. No SRT upload, no extra step — just finished content, ready to post.
Start for free