Default off is the whole problem
Automatic subtitles only appear for viewers who enabled captions. Burned-in text is in the picture, so the scrolling, muted majority reads it without doing anything.
YouTube Shorts
Subtitles for YouTube Shorts
YouTube generates subtitles for Shorts, but the viewer has to switch them on, so most never see them. Burning your own in fixes that: Capster transcribes the audio on your iPhone, times each word, and renders the subtitles into the file, so the Short you upload already shows them to everyone.
iPhone, iOS 16.0+ · 99 languages, detected automatically ·Updated September 2026
YouTube's automatic subtitles versus your own
Leave YouTube's on. Add yours anyway. They do different jobs and the second one is the one that affects watch time.
They arrive after processing
YouTube's subtitles are generated once the upload is processed. Text you burned in was there before you tapped upload, and you had a chance to fix the words it got wrong.
Yours are styled, theirs are not
9 presets, your font, your outline, your placement, and word-by-word highlight if you want it. YouTube's are YouTube's.
The same file goes everywhere
One export uploads to Shorts, Reels and TikTok with the same subtitles. Nothing platform-specific has to be redone.
Placing subtitles inside the Shorts player
- Keep clear of the bottom. The title, channel name and Subscribe row sit across the lower part of the frame.
- Keep clear of the right edge. Like, dislike, comment, share and remix stack down that side.
- Aim above centre. It stays clear of both, and it matches where the viewer's eye already is.
- Do not fight the progress bar. A subtitle sitting right on it is unreadable the moment someone scrubs.
Caption once, post three times
The reason to burn subtitles in rather than let each platform generate its own is that the work stops being per-platform.
- 1
Export once from Capster
One finished file with the subtitles rendered into the frames, at full quality, in your camera roll.
- 2
Upload it three times
Shorts, Reels and TikTok all take the same file, and the subtitles look identical on each.
- 3
Leave the platform captions on too
They cost nothing and they cover the viewers who rely on real captions rather than text in the picture.
Questions people ask
Does YouTube add subtitles to Shorts automatically?
YouTube generates automatic subtitles for most uploads, Shorts included, and they are a genuine accessibility feature. They are also off unless the viewer turns them on, styled by YouTube, and generated after processing rather than before you post.
How do I add my own subtitles to a YouTube Short?
Caption the clip before you upload. Import it into Capster, let the audio transcribe, choose a style, and export. The subtitles are rendered into the video, so the Short goes up with them already visible and no viewer has to enable anything.
Should I upload an SRT file as well?
For a Short, there is nothing to gain from the phone — YouTube's own subtitle upload is a desktop and browser workflow. For long-form uploads it is worth doing, because a real subtitle track is searchable and selectable in a way burned-in text is not.
Do burned-in subtitles count as accessibility?
Not on their own. A screen reader cannot read pixels, and a viewer who needs a different language or a larger size cannot change them. Burn yours in for the muted-scroll viewer, and leave YouTube's automatic subtitles on for everyone else.
What length of Short can I caption for free?
The free tier covers clips up to 2 minutes and 5 transcriptions in total, which fits the majority of Shorts. Longer clips and unlimited transcriptions are what Pro removes the limit on.
More on the difference between burned-in subtitles and an SRT sidecar.
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Subtitles nobody has to switch on
Free to try: 5 transcriptions and clips up to 2 minutes.
Free to try: 5 transcriptions, clips up to 2 minutes, exports carry a small Capster badge. iPhone, iOS 16.0+. No account.