Tutorials Video

How to Add Captions and Subtitles to Video

Beginner · ~30 min

Overview

Captions aren't optional anymore: the majority of social video is watched muted, and captions are a hard requirement for accessibility and a meaningful SEO signal on YouTube. This guide covers the full workflow: auto-generating a rough transcript, correcting it properly, and choosing the right delivery format for your platform.

What You Need

Your edited video file
An auto-caption tool (YouTube Studio's built-in captions, Adobe Premiere's Speech to Text, or CapCut)
The site's SRT Caption Editor for quick timing and text fixes

Steps

Auto-generate a first-pass transcript

Upload your video to YouTube Studio (even as unlisted) to get a free automatic caption track, or use your editor's built-in speech-to-text (Premiere, DaVinci Resolve, CapCut all have one). Download the result as an SRT file to edit.

Correct names, jargon, and punctuation

Auto-captions reliably get proper nouns, brand names, and technical terms wrong. Read through the whole transcript once specifically hunting for these. They're the errors viewers notice most and trust you least for.

Check timing and line length

Captions should be on screen long enough to read comfortably (roughly 1 second per 3 words, minimum 1.5 seconds) and no more than 2 lines / ~40 characters per line. Use the SRT Caption Editor to nudge timings without re-typing text.

Choose burned-in or sidecar delivery

Burned-in captions are rendered permanently into the video frame, required for platforms with unreliable native caption support (some Reels/TikTok contexts) and useful when you want stylised captions. Sidecar SRT/VTT files stay separate and toggleable: required by YouTube, Vimeo, and most broadcast/streaming delivery specs.

Export and upload

For YouTube: upload the corrected SRT/VTT directly in YouTube Studio's Subtitles tab. For Instagram/TikTok: burn captions in during export if the platform's own auto-captions aren't reliable enough for your content, using the SRT Caption Editor's converted timing as your reference.

Pro Tips

Never publish raw auto-captions unedited, accuracy below roughly 95% actively damages trust and comprehension, and auto-caption engines rarely clear that bar on their own.
Keep a plain-text transcript alongside your caption file. It's reusable for the Transcripts tutorial's SEO benefits without any extra work.
For multi-language audiences, translate the corrected English SRT rather than auto-captioning in each language separately, translation-from-clean-source is far more accurate.

Knowledge Base

Captions vs. Subtitles. What's the Difference?

Captions include non-speech audio information (sound effects, music cues, speaker labels) for viewers who can't hear the audio at all. Subtitles assume the viewer can hear but not understand the language, so they translate dialogue only. Most creator content technically needs captions, not subtitles, even though the terms get used interchangeably.

SRT vs. VTT

SRT (SubRip) is the simplest, most universally supported caption format, plain text with timestamps. VTT (WebVTT) is SRT's web-native successor, adding styling and positioning support used by some browser-based players. When in doubt, deliver SRT. Nearly every platform accepts it, and most that require VTT can convert from SRT automatically.

Why Captions Are an SEO Signal Too

YouTube indexes your caption text as searchable content and uses it to understand what your video is actually about, beyond just the title and description. A well-corrected caption file can meaningfully improve how your video surfaces for relevant search queries.

Where This Fits

This guide covers one specific part of captions and access. The wider picture, caption formats, reading speed, speaker identification, what automatic captioning still gets wrong, and a practical QA pass, is in Beyond Auto-Captions: Caption Quality, Styling, and Readability, which frames the discipline as a whole and links out to the detailed guides underneath it, including this one. If you are starting from scratch rather than solving a specific problem, read that first and come back here.

FAQ

Q: Are YouTube's auto-captions good enough on their own?
A: For casual content, sometimes. For anything monetized, professional, or accessibility-critical, always correct them: accuracy varies wildly with accent, background noise, and jargon.

Q: Do I legally need captions?
A: Broadcast and many public-sector/education contexts have legal accessibility requirements (e.g. ADA in the US, EAA in the EU). Independent creator content isn't usually legally mandated, but captions remain a strong accessibility and engagement practice regardless.