# Captionly

> Free AI subtitle generator that runs entirely in the browser. Uses OpenAI Whisper via WebGPU + WebCodecs — no upload, no signup, no watermark. Files never leave the user's device.

Captionly transcribes 99 languages, lets users edit transcripts inline with click-to-seek, applies 12 TikTok-style subtitle presets, and burns subtitles back into MP4 — all without any server-side processing. The Whisper model (~60 MB) is fetched once from the Hugging Face Hub and cached for subsequent runs.

## Core

- [Home (English)](https://reel-caption.vercel.app/en): What Captionly does, hero demo, in-browser editor.
- [All supported languages](https://reel-caption.vercel.app/en/languages): The 99 Whisper transcription languages with their writing systems and approximate accuracy.

## Tool landings

- [TikTok subtitle generator](https://reel-caption.vercel.app/en/tiktok-subtitle-generator): TikTok-optimized presets, vertical format support, viral subtitle styles.
- [Podcast subtitle generator](https://reel-caption.vercel.app/en/podcast-subtitle-generator): Long-form transcription, accurate speaker timing, export SRT/VTT.
- [YouTube Shorts subtitles](https://reel-caption.vercel.app/en/youtube-shorts-subtitle-generator): Vertical 9:16 captioning, burn-in MP4.
- [Burn subtitles into MP4](https://reel-caption.vercel.app/en/burn-subtitles-into-mp4): WebCodecs-based in-browser re-encode.
- [MP4 to SRT converter](https://reel-caption.vercel.app/en/mp4-to-srt): Extract a subtitle file from any MP4 without uploading.

## Comparisons

- [Captionly vs Submagic](https://reel-caption.vercel.app/en/captionly-vs-submagic): Free in-browser alternative to Submagic, no watermark, no signup.
- [Captionly vs Kapwing](https://reel-caption.vercel.app/en/captionly-vs-kapwing): Free, fully private alternative to Kapwing's subtitle tool.
- [Captionly vs VEED](https://reel-caption.vercel.app/en/captionly-vs-veed): In-browser alternative to VEED.IO, no upload.

## Language-specific generators

- [Spanish subtitle generator](https://reel-caption.vercel.app/en/spanish-subtitle-generator)
- [French subtitle generator](https://reel-caption.vercel.app/en/french-subtitle-generator)
- [Japanese subtitle generator](https://reel-caption.vercel.app/en/japanese-subtitle-generator)
- [German subtitle generator](https://reel-caption.vercel.app/en/german-subtitle-generator)
- [Italian subtitle generator](https://reel-caption.vercel.app/en/italian-subtitle-generator)
- [Portuguese subtitle generator](https://reel-caption.vercel.app/en/portuguese-subtitle-generator)
- [Chinese subtitle generator](https://reel-caption.vercel.app/en/chinese-subtitle-generator)
- [Korean subtitle generator](https://reel-caption.vercel.app/en/korean-subtitle-generator)
- [Russian subtitle generator](https://reel-caption.vercel.app/en/russian-subtitle-generator)
- [Arabic subtitle generator](https://reel-caption.vercel.app/en/arabic-subtitle-generator)
- [Hindi subtitle generator](https://reel-caption.vercel.app/en/hindi-subtitle-generator)
- [Turkish subtitle generator](https://reel-caption.vercel.app/en/turkish-subtitle-generator)
- [Polish subtitle generator](https://reel-caption.vercel.app/en/polish-subtitle-generator)
- [Dutch subtitle generator](https://reel-caption.vercel.app/en/dutch-subtitle-generator)
- [Vietnamese subtitle generator](https://reel-caption.vercel.app/en/vietnamese-subtitle-generator)
- [Indonesian subtitle generator](https://reel-caption.vercel.app/en/indonesian-subtitle-generator)
- [Thai subtitle generator](https://reel-caption.vercel.app/en/thai-subtitle-generator)
- [Swedish subtitle generator](https://reel-caption.vercel.app/en/swedish-subtitle-generator)
- [Greek subtitle generator](https://reel-caption.vercel.app/en/greek-subtitle-generator)
- [Hebrew subtitle generator](https://reel-caption.vercel.app/en/hebrew-subtitle-generator)
- [Czech subtitle generator](https://reel-caption.vercel.app/en/czech-subtitle-generator)
- [Romanian subtitle generator](https://reel-caption.vercel.app/en/romanian-subtitle-generator)
- [Ukrainian subtitle generator](https://reel-caption.vercel.app/en/ukrainian-subtitle-generator)

## Optional

- [Sitemap](https://reel-caption.vercel.app/sitemap.xml): Full machine-readable URL inventory with hreflang clusters.
- [Robots](https://reel-caption.vercel.app/robots.txt): Crawler policy.