About Autosubbed

Making subtitles effortless since 2025

What is Autosubbed?

Autosubbed is an online tool that automatically burns subtitles directly into your video files. Upload any video, and within minutes you get back a new file with permanent, styled captions baked in — no editing software required, no manual syncing, no separate subtitle track to manage. The subtitles are part of the video itself, visible on every device and every platform.

Why we built it

Adding captions to video is one of those tasks that sounds simple but eats hours. Professional captioning services are expensive and slow. Desktop tools require learning complex software. DIY approaches mean manually typing every word, adjusting timestamps one by one, and then re-encoding the file.

We built Autosubbed because we kept running into this problem ourselves. Content creators, educators, marketers, and developers all need subtitled video — for accessibility, for social media reach, for non-native speakers in their audience. The whole process should take seconds, not hours. Autosubbed makes that possible.

How it works

The pipeline has three stages:

1. Transcription — We extract the audio track from your video and send it to OpenAI Whisper, the state-of-the-art speech recognition model. Whisper produces a timestamped transcript with word-level accuracy across dozens of languages.
2. Subtitle generation — The transcript is converted into an SRT file with properly segmented lines and timings. Each line is kept short enough to be readable on screen without covering too much of the frame.
3. Burning — FFmpeg renders the subtitles directly onto the video frames using libass, the same rendering engine used by VLC and most professional video players. The result is a single output file with the captions permanently embedded.

The entire process runs in the cloud. You never need to install anything locally.

The technology

Autosubbed is built on OpenAI Whisper for transcription, FFmpeg for video processing, and a FastAPI backend with Celery workers that handle jobs asynchronously so you don't wait for long videos to block the interface. Files are stored temporarily in Cloudflare R2 and deleted automatically after processing. We don't keep your videos.

Get in touch

Questions, feedback, or business inquiries? Reach us at support@autosubbed.com. We read every message.