Upload your video, get accurate SRT captions in minutes. No account. No watermark. No subscription.
Works on any video · Supports 99 languages · Max 5 minutes
| Feature | Capllio | Others |
|---|---|---|
| Price | Free | $10–$30/mo |
| Watermark | None | Free plan watermarks |
| Account needed | No | Required |
| Languages | 99+ | Varies |
| SRT export | Yes | Paid only |
Generate professional captions for your videos in three simple steps, completely free.
Using Capllio is designed to be as simple as possible. You don't need to create an account, enter a credit card, or install any software. Everything runs directly in your browser.
Click the "Open Editor" button on this page. The editor will load instantly in your browser. No waiting, no loading screens.
Click the video panel and select your video file. Capllio supports MP4, MOV, AVI, MKV, and WEBM formats. Your video must be under 50MB and no longer than 5 minutes. Your video never leaves your device — it is processed entirely locally before sending audio to our servers.
Our AI engine, powered by OpenAI's Whisper model, analyses your video's audio and generates accurate captions with precise timestamps. This typically takes 15 to 60 seconds depending on your video's length and language.
Once transcription is complete, click "Download SRT". A short advertisement plays (this is how we keep the service free), and then your SRT file downloads automatically. You can import this file into YouTube Studio, Adobe Premiere, DaVinci Resolve, Final Cut Pro, or any other video editing platform.
Capllio is a free AI-powered caption and subtitle generator that works entirely in your browser.
Capllio is a free online tool that automatically generates captions and subtitles for videos using artificial intelligence. We built it because existing captioning tools are either expensive, require subscriptions, or add watermarks to your work. We believe accurate captions should be accessible to everyone — whether you're a student, content creator, journalist, or business owner.
Capllio is ideal for YouTube creators who need quick subtitles, educators creating accessible content, journalists transcribing interviews, businesses captioning training videos, and anyone who needs accurate captions without paying a monthly subscription.
Capllio is powered by Whisper, one of the most accurate speech recognition models available today.
Capllio uses OpenAI's Whisper large-v3-turbo model, running on Groq's high-performance LPU (Language Processing Unit) infrastructure. This combination gives you near-instant transcription at a quality level that rivals paid services costing hundreds of dollars per month.
Whisper was trained on 680,000 hours of multilingual audio data, making it exceptionally good at understanding accents, background noise, and technical vocabulary. It supports 99 languages natively and can automatically detect which language is being spoken without you needing to specify it.
When you upload a video, Capllio first extracts the audio track directly in your browser using the Web Audio API. This audio is then split into small chunks and sent securely to our server, where the Whisper model transcribes each segment. The timestamps from each segment are carefully aligned so that your final SRT file is accurate to within a fraction of a second.
Yes. Your original video file never leaves your device. Only the audio is sent to our transcription server, and we do not store or log any audio data after processing. Each request is processed in real time and discarded immediately after your SRT is generated.
Capllio works with all major video formats and supports 99 languages including Hindi, Spanish, French, and more.
Capllio accepts MP4, MOV, AVI, MKV, and WEBM video files. MP4 is the recommended format for the best results. Files must be under 50MB and no longer than 5 minutes in duration.
Our Whisper AI model supports 99 languages. You can either let the model auto-detect the language, or select your language manually from the dropdown in the editor for more accurate results. Some of the most popular supported languages include:
For the most accurate captions, use a video with clear audio and minimal background noise. Select the correct language manually if auto-detection is giving inaccurate results. Videos with a single speaker generally produce more accurate results than multi-speaker conversations.
Once you have your SRT file, importing it into YouTube, Premiere Pro, or DaVinci Resolve takes less than a minute.
Go to YouTube Studio → select your video → click Subtitles → click Add → Upload file → select your SRT file. YouTube will automatically sync the captions with your video.
Open your project → go to File → Import → select your SRT file. Drag the caption track to your timeline and position it below your video track.
In the Edit page, go to File → Import → Subtitles → select your SRT file. The subtitles will appear as a separate track in your timeline which you can style and position freely.
Go to File → Import → Captions → select your SRT file. Final Cut Pro will automatically attach the captions to your video clip in the timeline.
Both platforms support SRT files. When uploading your video, look for the captions or subtitles option and upload your SRT file directly. Instagram calls this "Auto-generated captions" in their settings.
Help us make Capllio better. Share your experience, report issues, or suggest new features. Every piece of feedback is read by our team.