Caption generator
Subtitles Without Installing an App
Looking for a subtitle app? You don't need to install one. CapsAI runs in the browser you already have: Chrome or Edge on a Windows PC, Safari or Chrome on a Mac, Safari on an iPhone, Chrome on an Android phone. Open the page, sign in with Google or an email code, add a video, and CapsAI writes captions from the speech, times them to the words and opens them in an editor where you fix any word and pick a style. The result is one MP4 with the captions burned in, saved to your phone or computer like any other download. There is no CapsAI app in the App Store or on Google Play, and nothing to update. 3 free minutes to start. Files up to 500 MB, or 10 GB with a pack. Videos up to 10 minutes each. Packs are paid once, from $4 (₹49 in India, €4 in the euro area).
Start with 3 free minutes. Watermark-free export comes with every paid pack.
Upload Video
For best results, upload a video with clear speech. You can review and edit the captions after generation.
Drag and drop video or
MP4 or MOV, any aspect ratio.
English subtitle example: This is a preview of the subtitle design Please transcribe to get your video
What the captions look like
iPhone vlog, straight from Photos
Day three in Lisbon and my feet have given up.
An iPhone set to High Efficiency records HEVC video. Pick the clip from Photos in Safari and upload it as it is.
Android screen recording
Open Settings, tap Display, then turn on dark mode.
Menu names and button labels are the words to read twice. Fix them with the phone keyboard before you export.
4K camera file on a laptop
We cut onboarding from five days to two.
A few minutes of camera 4K can pass 500 MB. Drag it onto the page on a PC or Mac; a pack takes files up to 10 GB.
Started on the phone, finished on the laptop
Check the return window before you pay.
Upload during the commute, then open the same project from your workspace on a laptop to correct the words on a bigger screen.
What you get
- Nothing to install or update on a phone, a work laptop or a shared computer
- The same account and projects on your phone and your PC, so you can start on one and finish on the other
- iPhone .MOV files accepted as recorded, and files up to 10 GB from a desktop with a pack
- 37 caption styles, 8 of them free, with the rest included in any paid pack
- Packs paid once, from $4 (₹49 in India, €4 in the euro area), with nothing to cancel
Where it helps
- Phone-first creators who film, caption and post from one handset
- Office laptops where installing software needs an IT ticket
- Editors with large 4K exports that are easier to handle on a desktop
- Shared or borrowed computers where nothing should be left installed
How it works
How it works
Step 1
Open the page in your browser
Safari on iPhone, Chrome on Android, and Chrome, Edge or Safari on a computer. Sign in with Google or an email code.
Step 2
Add the video from your gallery or desktop
On a phone, tap upload and choose the clip from Photos or the gallery. On a PC or Mac, drag the file onto the page. MP4 or MOV, up to 10 minutes per video.
Step 3
Choose the language spoken
English is selected from this page. Pick another of the 11 spoken languages if the video is in one; captions come out in the language spoken, with no translation.
Step 4
Correct the draft
Tap or click a caption to retype it. Start and end times are number fields, so a late caption is a quick fix. Then choose a style, size and position.
Step 5
Export and save the MP4
The export renders the captions into the video. Download it and post it from Instagram, TikTok or YouTube.
Choose your spoken language
What to do next
Related tools
Questions
Is there a CapsAI app for Android or iPhone?
No. There is no CapsAI app on the App Store or Google Play and no installable web app. CapsAI runs in Safari or Chrome on the phone, with an editor laid out for a small touch screen.
Which browsers does it work in on a PC or Mac?
Use a current version of Chrome or Edge on Windows, or Safari or Chrome on a Mac. In CapsAI's own visitor data from markets outside India (30 days to 19 October 2026), Chrome, Safari and Edge, on phones and computers together, made up about 93% of sessions.
Do I need to convert iPhone videos to MP4 first?
No. iPhones set to High Efficiency record HEVC video, and CapsAI accepts those .MOV files as they are. In Chrome on Android, an iPhone .MOV may show "Preview unavailable", but the upload and the captions do not depend on the preview.
Where does the captioned video go when I download it?
On an iPhone, Safari saves it to the Downloads folder in the Files app (Apple Support, read 19 October 2026). On Android, Chrome saves it to your default download location, which the Files app lists. On a computer, it lands in your usual Downloads folder.
Does it work offline?
No. Captioning runs on CapsAI's servers, so you need a connection to upload, edit and export. If you must work offline, Subtitle Edit describes itself as "an offline, open-source application" for Windows, macOS and Linux (its GitHub page, read 19 October 2026); it makes subtitle files rather than a captioned MP4.
Is it free, and is there a watermark?
A new account gets 3 free minutes of captioning to try it on your own video. Packs are paid once: Starter 20 minutes from $4 (₹49 in India, €4 in the euro area), Creator 60 minutes from $9, Pro 180 minutes from $19. Watermark-free export comes with every paid pack.
Can I download an SRT file?
No. The output is one MP4 with the captions burned in; there is no SRT, VTT or TXT download. If you already have a text or subtitle file, CapsAI's free browser converters turn TXT into SRT and SRT into VTT.
Which languages and accents does it handle?
Captions come out in the language spoken: English, Hinglish, Hindi, Bengali, Telugu, Marathi, Tamil, Urdu, Gujarati, Kannada or Punjabi, with no translation. CapsAI's English has been used most on Indian English; for other accents, run your own clip through the 3 free minutes and read the draft.
How long does it take, and will my phone storage fill up?
A short clip takes a few minutes; on mobile data, a large file takes longer to upload. Processing runs on the server, so the only file saved to your phone is the finished MP4. Projects are kept for 1 day on the free minutes and 3, 7 or 15 days with a pack, so download the export soon after.
On a PC or Mac: drag, drop and handle big files
A desktop is the better seat for long or heavy files. Open the page in Chrome or Edge on Windows, or Safari or Chrome on a Mac, and drag the video from a folder onto the upload box. A camera's 4K file or a long screen recording can run past the 500 MB free limit quickly; with a pack, files up to 10 GB are accepted, and each video can be up to 10 minutes. A full keyboard also makes the correction pass faster: click a caption, retype it, and set its start and end time as numbers.
Nothing is installed, so there is no administrator prompt. On a shared machine, sign out and delete the downloaded MP4 when you are done. The export is 1080p on Starter and up to 4K on Creator and Pro. If you need a subtitle file, a translation or more than 10 minutes per video, installed software fits better; our post on desktop subtitle software versus an online generator compares the options.
On Android and on iPhone
On Android, open the page in Chrome, tap upload and pick the clip from the gallery. The editor fits a phone screen: tap a caption to edit it, choose a style, export. Chrome saves the MP4 to your default download location, which the Files app lists. An iPhone .MOV sent to an Android phone may show no preview in Chrome; it still uploads and captions normally.
On an iPhone, use Safari. Pick the video from Photos and upload the .MOV as recorded. When the export is ready, Safari saves it to the Downloads folder in the Files app; from there, the Share button sends it to the app you post from. For a walk through every phone option, including CapCut and Instagram's own captions, read the guide to adding captions on iPhone and Android.
Why a browser tool instead of an installed app
A browser page suits a phone with no space left, a work laptop that blocks installs, and anyone who wants one tool on both. Projects live in your account, not on the device, so a clip uploaded from a phone can be finished on a PC. The trade-offs: you need a connection, projects are kept for days rather than forever, and the output is a captioned MP4, not a subtitle file.
Learn more