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Captions Generator
Captions Generator — AI captions and subtitles for any video, free in your browser. Edit, style, translate and export MP4, SRT, VTT or TXT. No sign-up.
About Captions Generator
Captions Generator is an online AI caption and subtitle generator. Drop in a video, audio or SRT file and get word-timed captions in 100+ languages within seconds. Fix any word, pick one of 22 caption styles, add titles, and export a captioned MP4 or SRT, VTT and TXT subtitle files. Free with no sign-up for videos up to 30 minutes each (small watermark on free MP4s); subtitle translation into 100+ languages is free. Pro ($59/year) removes the watermark and adds 90-minute videos, 4K, word animations and bilingual captions.
- Who it is for
- Video creators, marketers, teachers and podcasters who need captions or subtitle files fast.
- Problem it solves
- Adding captions by hand is slow, and most caption tools ask you to sign up, upload your whole video, or pay before you can download anything. Many free plans add tight time limits or block SRT export.
- The solution
- Drop in a video, audio or SRT file and get word-timed captions in 100+ languages within seconds. Fix any word, pick a style, translate the captions, then export a captioned MP4 or SRT, VTT and TXT files, all in the browser with no sign-up.
- What makes it unique
- It is free for videos up to 30 minutes each with no sign-up and no monthly limit, subtitle translation is free, and SRT/VTT/TXT files never carry a watermark (free MP4s have a small one). The video stays on your device; only the audio is sent for transcription. Pro is $59/year.
Features
AI captions in 100+ languages
Upload a video or audio file and get word-timed captions in seconds.
Edit every word
Fix names and terms in the editor before you export.
Caption styles
8 free styles and 22 with Pro, plus titles on the video.
Free subtitle translation
Translate captions or your own SRT into 100+ languages.
MP4, SRT, VTT and TXT export
Burn captions into the video or download subtitle files.
Private by design
The video stays on your device; only the audio is sent for transcription.
Details
- Platforms
- Web
- Pricing
- Freemium
- Subscription
- Free trial
- Built for
Video creators, marketers, teachers and podcasters who need captions or subtitle files fast.
- Building since
2026
Technology
Captions Generator product screenshot
1 / 1Website performance
Recorded mobile lab measurements and finalized weekly standings from IndieTools Speed.
Captions Generator website speed overview
72
Performance scoreNeeds improvement
In IndieTools' mobile lab test on November 9, 2026, the Captions Generator website scored 72 out of 100 (needs improvement). Largest Contentful Paint took 5.30 s, rated poor.
Measured (UTC)
- LCPLargest Contentful Paint
- 5.30 s
- Poor
- TBTTotal Blocking Time
- 116 ms
- Good
- CLSCumulative Layout Shift
- 0.000
- Good
- FCPFirst Contentful Paint
- 2.71 s
- Needs improvement
Not ranked in a finalized week yet.
Captions Generator lab metrics
| Metric | Result | Status | Trend |
|---|---|---|---|
| Mobile lab testMid-range phone on a throttled 4G connection, two runs averaged. Changes compare with the run on Nov 9. | |||
| Performance score Needs improvementDown 3 points | 72 / 100 | Needs improvementDown 3 points | |
| First Contentful Paint Needs improvementAbout the same | 2.71 s | Needs improvementAbout the same | |
| Largest Contentful Paint Poor588 ms slower | 5.30 s | Poor588 ms slower | |
| Speed Index Needs improvementAbout the same | 4.97 s | Needs improvementAbout the same | |
| Total Blocking Time Good19 ms slower | 116 ms | Good19 ms slower | |
| Cumulative Layout Shift GoodAbout the same | 0.000 | GoodAbout the same | |
| Unthrottled observationsTimed on the test machine's own fast connection, so they read lower than the lab metrics above. | |||
| Page load 78 ms faster | 753 ms | 78 ms faster | |
| Server response About the same | 2 ms | About the same | |
Captions Generator performance history
3 comparable mobile lab runs since November 9, 2026. Choose a metric and a range, then move along the line to read each run.
Captions Generator Speed ranking
Not ranked yet. Ranks appear once a week with this product is finalized.
Stored lab observations from controlled test runs, not real-user Core Web Vitals or a guarantee of search rankings. Weekly standings remain attached to their finalized edition.Method psi-mobile-two-sample-mean-v1, 2 samples per reading. Lab results can vary between runs.
Domain Rating
Domain Rating by Ahrefs- DR4 (primary model)
- 25
First DR4 reading
- DR3
- 27
First DR3 reading
Model difference−2. DR4 is 2 points lower than DR3.
Measured · captionsgenerator.app
What do DR4, DR3 and the model difference mean?
- DR4:
- Ahrefs' newer model. It gives more weight to links from sites with organic search traffic and rates a subdomain on its own links.
- DR3:
- The previous model, shown in the Ahrefs app until 1 December 2026.
- Model difference:
- DR4 minus DR3 for the same domain. The models calculate differently, so this is not growth or a drop; the “since” lines compare each model with itself.
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