Add Captions to an Instagram Story

How people watch Stories

Stories behave differently from every other video on Instagram. They play full screen one after another, a tap on the right skips ahead, a tap on the left goes back, and pressing and holding pauses. A swipe moves to the next account. Most people tap through quickly, and many watch with the sound off.

That shapes the captions. Each one has to be readable before the viewer's thumb moves, which means a few words at a time in large type. A sentence that needs four seconds to read is a sentence most people won't finish. Instagram also splits longer videos into separate Story segments, so a single long clip becomes several taps; captions that run across a split are interrupted.

The bars at the top and bottom

Two strips of a Story belong to Instagram rather than to you. Across the top there's the progress bar, one segment per Story, with the account picture, name and posting time just below it and a menu and close button to the right. Across the bottom there's the reply field for sending a message, with like and share buttons next to it on most versions. Stickers you add yourself, such as polls, links, mentions or music, take further space wherever you put them. Exact sizes vary by phone and change with app updates.

The editor's safe-area guide for a 9:16 frame keeps a margin at the top and a deeper one at the bottom, which lines up with this layout in general terms but isn't a measurement of Instagram's bars. It shows only in the preview.

Captions sticker or burned-in captions

Instagram's Story editor has a captions sticker, where available, that transcribes your clip's speech into on-screen text. Compare it with text that's part of the video:

Captions sticker

Added inside Instagram while posting. You can edit the words, choose from a few styles and drag the sticker around. It depends on the app supporting your language and account, and the look is Instagram's.

Burned-in captions from this editor

Rendered into the MP4 before posting. Your choice of font, size, colours and position, and identical if the Story is saved, shared or reposted. Changing a word means rendering again.

Both are valid choices. A captions sticker is quick for a one-off Story filmed on your phone; burned captions suit clips you edited on a computer, use across several platforms, or want to keep consistent with a brand look. Don't combine them on one clip, or the words appear twice.

Captioning a Story clip

1. Open the editor on this page and choose the vertical clip: MP4, MOV, M4V, WebM or MKV. The Social Media preset is selected under Style.
2. Leave "Write the subtitles automatically with AI" on to transcribe the speech, or switch it off and use Import SRT / VTT, or press Enter at the playhead to type a line.
3. Read each line against the clip. Short lines are better here, so use Split at the playhead to break a long one into two.
4. Tick "Show safe area" and check the captions stay clear of the top bar and the reply field, plus any spot where you plan to add a sticker.
5. Click Render video, start the render from the summary, keep the tab open until it completes, then click Download video.
6. Post the MP4 as a Story from your phone, adding stickers around the captions.

The rendered file keeps the clip's resolution, frame rate and orientation. The editor doesn't crop or pad, so a horizontal clip stays horizontal and Instagram shows it with space around it; reframe to 9:16 first if it should fill the screen.

Writing captions for a quick tap

• Two to five words per caption reads fastest. AI captions are short single lines already, at about 32 characters; trim further if the Story is fast.
• Hold each line long enough. The editor warns when a caption is shown for under 0.8 seconds, which is too brief even for one word.
• Watch the reading speed. Above 21 characters per second, the line turns into a warning; on a Story, that's a sign to cut words rather than speed up.
• Put the point in the first caption. Viewers who tap away after two seconds should still get the message.
• Plan around segment breaks. If a long clip will be split, cut it into shorter clips in your video editor first and caption each one, so no caption is interrupted by a new segment.

Leaving room for stickers

Stickers are part of what makes Stories work, so decide where they'll go before you place captions. Social Media starts on the Middle anchor, nudged slightly downward, which leaves the upper part of the frame open for a poll or a link sticker. If you want the lower half free instead, choose Top, which starts at the guide's top margin (check that it clears the account name under the progress bar), and use "Nudge up / down" to fine-tune; choosing an anchor resets the nudge to zero.

On a very busy background, a box behind the text keeps captions legible under any sticker colours. Social Media's white rounded box already does that; Creator's yellow outlined capitals stand out over darker footage. Customising subtitles covers the other controls, and moving subtitles to the top goes into top placement in detail.

Three Stories, three approaches

The same clip can work as a Reel too, where the overlay is different; subtitles for Instagram Reels shows where words go there. If what you need is just a caption file from the speech, the subtitle generator makes one without rendering anything.

About the subtitle editor on this page

Opens

MP4, MOV, M4V, WebM, MKV videos your browser can decode

Subtitles from

AI (from the speech, optionally translated into one of 21 languages), an SRT or VTT file, or typing them in

You download

An MP4 with the subtitles drawn into the picture at the original resolution and frame rate, plus SRT and VTT files

Cost

Editing, styling, rendering and SRT/VTT export are free, with no account and no watermark. AI subtitles cost 1 credit per minute (5-credit minimum per video); signing in with Google gives 100 free credits and accounts get 10 free credits a day

Privacy

The video never leaves your device and is rendered in your browser. Only for AI subtitles is the audio sent, over HTTPS, and it is deleted within 30 minutes of delivery

Rendering needs

Chrome or Edge 94+, Safari 16.4+, or Firefox 130+ on a computer. Editing and SRT/VTT export work in any current browser