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This is how I added an in-browser auto captions feature to my YouTube Shorts converter web application using Whisper AI and ffmpeg.wasm

This story is from 2026-09-07. It is preserved in the archive; the latest stories are on the live feed.

A few weeks ago I launched Convert to Shorts — a free browser-based tool that converts horizontal videos to YouTube Shorts format (9:16) without uploading anything to a server. I wrote about the ffmpeg.wasm + Vite setup in a previous article. The most requested feature after launch was auto caption…

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  1. 2026-09-07 03:23 · DEV Community — AI
    This is how I added an in-browser auto captions feature to my YouTube Shorts converter web application using Whisper AI and ffmpeg.wasm

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