Add accurate, readable captions that clear every platform's UI.
Transcribe, correct, style and translate captions for Shorts, TikTok and Reels, and keep them readable and out from under app buttons.
Auto-transcribe from clean audio
Automatic speech recognition makes more mistakes with background noise, accents and mispronounced words. YouTube's own help page warns about this for its automatic captions.
- Edit at 9:16, 1080x1920, before you add any captions, so the line breaks fit the final frame.
- Turn background music down or mute it under speech while the tool transcribes. You can raise it again afterwards.
- In CapCut, use the auto captions tool. It detects the spoken language and syncs the text to your video.
- If the speaker uses more than one language, set the source language yourself instead of relying on auto-detect.
Tool: CapCut · Free option: CapCut
Tip: Make a list of names, brand terms and jargon you use often, and search the transcript for them first. Automatic captions get these wrong most often.
Correct every line before you style it
Caption errors make speech harder to follow, and fixing text after you've animated it takes longer. Every platform's automatic captions can be edited before or after posting, which is a sign they're not reliable enough to post unchecked.
- Read the whole transcript once while the video plays at normal speed, and fix any words that are wrong.
- Split long lines so each caption shows about one short phrase. Shorter lines are easier to read on a phone.
- Leave out filler words that add nothing, but don't change what the speaker meant.
- Add sound cues such as [laughs] or [music] where they matter. YouTube recommends including them for viewers who can't hear the audio.
Tool: CapCut · Free option: CapCut
Tip: Watch the corrected captions once with the sound off. Anything you can't follow without audio is something a muted viewer can't follow either.
Style for readability, then for emphasis
WCAG 2.x asks for a contrast ratio of at least 4.5:1 for normal text, or 3:1 for large text (18pt, or 14pt bold), and phone viewers watch over busy, moving footage. Whether word-by-word highlighting improves retention is not well documented, so treat it as a style choice and check your own analytics.
- Use a heavy sans-serif font with a dark outline or a semi-opaque box behind it, so the text passes 4.5:1 against both light and dark frames.
- Show 1-2 lines at a time and keep text large. Small text gets lost on phone screens.
- In Submagic, pick a template, then highlight in color only the 1-3 key words in each sentence, not every word.
- Save the style as a template or brand preset so every video looks the same and you don't redo the work. Submagic Starter allows 15 videos a month, each up to 2 minutes.
Tool: Submagic · Free option: CapCut caption presets (free) or the single free template in Captions
Tip: Check your highlight color against a contrast checker. Yellow on white footage often fails the 3:1 large-text threshold.
Place captions inside the safe zone
Each app puts its buttons, username, post caption and navigation over the bottom and right edges of the video. TikTok's ad specs say the safe zone shrinks as the post caption gets longer.
- Put burned-in captions in the vertical middle of the frame, a little below center, and keep them away from the bottom edge and the right-hand button column.
- Keep a margin on the left and right sides so letters aren't cut off by rounded screens or overlays.
- Before posting, upload a test as a draft or private post on each platform and look at it with the full app interface showing.
- If you write long post captions on TikTok, move burned-in captions higher, since the post caption takes up more space at the bottom.
Tool: Submagic · Free option: CapCut
Tip: None of these platforms publishes official safe-zone numbers for organic posts. Meta and TikTok only publish them for ads. Take a screenshot of your own draft on each app, and use those screenshots as an overlay template in your editor.
Decide burned-in vs platform captions, and translate
Burned-in captions look the same everywhere but can't be turned off or translated. Platform captions can be turned on and off, but you have less control over style. If you use both, they can overlap, so RNID advises turning auto captions off when captions are already burned in.
- On TikTok, if your captions are burned in, leave the in-app Captions option off. Otherwise, turn it on from the editing screen and correct the text before posting.
- On YouTube, export an SRT from your caption tool and upload it in YouTube Studio > Subtitles > Add language. You can also paste a transcript and use auto-sync.
- For other languages, translate in Zeemo, which lists captions in 95 languages and translation into 124+. Read the result, or have a fluent speaker check it, before you upload it as a separate subtitle track.
- On Instagram, viewers turn auto-generated captions on or off themselves, and the caption language follows the viewer's device settings. Avoid burning in a second set of captions in the same spot.
Tool: Zeemo · Free option: YouTube Studio subtitles plus Zeemo Free (1-minute, 720p videos)
Tip: Keep your corrected master SRT. Every translation and every re-upload to another platform starts from it, so you only fix mistakes once.
What it costs
CapCut's free tier covers auto captions and styling. Zeemo Free caps videos at 1 minute, 200 MB and 720p export. You correct and place captions yourself, and you get only basic templates.
Paid plans get you animated templates with keyword highlighting, watermark-free 1080p exports, and translation for longer videos. Submagic Starter billed yearly plus Zeemo Pro (yearly) is about $20/mo. Submagic Starter monthly plus Zeemo Pro (yearly) is about $27/mo.
Rules to know before you post
- Since 24 September 2026, YouTube no longer automatically blocks new Shorts over one minute that get a third-party Content ID claim, but a claim can still affect the video, so check any music or B-roll a caption tool adds.
- YouTube's automatic captions help page says auto captions appear only in the video's default language and may misrepresent speech, so upload your own subtitle tracks for accuracy and for other languages.
- WCAG 2.x Success Criterion 1.4.3 (Contrast Minimum) sets 4.5:1 for normal text and 3:1 for large text, and it is the accepted benchmark for readable caption contrast.
- TikTok's ad safe-zone specs (TopView) say the safe area shrinks as the post caption gets longer, so captions that are fine on a short post can be covered on a long one.
Common mistakes
- Posting auto captions without checking them. Read the whole transcript once, and search for names and brand terms, where errors are most common.
- Putting captions at the very bottom, where the username, post caption and buttons cover them. Keep them a little below center and test on each app.
- Highlighting every word in a bright color, so nothing stands out and contrast suffers. Highlight 1-3 key words per sentence.
- Burning in captions and also turning on platform auto captions, which stack on top of each other. Use one or the other on each platform.
Questions
Do captions increase watch time on TikTok and Shorts?
There is little solid public data on how much captions change retention for short-form video, and the platforms don't publish figures. What is clear is that captions make a video usable by people watching muted and by deaf or hard-of-hearing viewers. Compare retention graphs in your own analytics before and after you start captioning.
Should I burn in captions or use TikTok/YouTube auto captions?
Burn in captions when the style is part of how the video looks. Use platform captions or uploaded SRT files when you want viewers to be able to switch them off or watch in another language. Many creators burn in captions in their main language and upload translated SRTs to YouTube.
Where should captions go so the app buttons don't cover them?
A little below the center of the frame, away from the bottom edge and the right-hand button column. None of the platforms publishes official safe-zone numbers for organic posts, so check a private draft on each app.
How do I add subtitles in other languages to a YouTube Short?
Export or translate an SRT file, then in YouTube Studio go to Subtitles, choose the video, click Add language, and upload the file. YouTube's automatic captions only cover the video's default language.
Researched and checked on 2026-10-11. Sources: Use automatic captioning - YouTube Help · Add subtitles and captions - YouTube Help · Understand three-minute YouTube Shorts - YouTube Help · Understanding Success Criterion 1.4.3: Contrast (Minimum) - W3C · TopView ad specifications - TikTok Ads Help · Manage reels and video captions on Instagram - Instagram Help · How to use video captions on Instagram - RNID · Submagic pricing · Zeemo pricing · CapCut auto caption generator · Captions pricing · YouTube Help: Shorts up to 3 minutes (UK edition, updated for 24 Sept 2026). Prices and policies change, so confirm on the provider’s site.