Add Spanish Subtitles to Video
ViralMint is a free Spanish subtitle generator — it transcribes your video locally with Whisper and adds accurate Español captions you can burn in or export.
Free Spanish subtitle generator, powered by local Whisper
ViralMint adds Spanish (Español) subtitles to any video using local Whisper transcription — the same OpenAI speech model that ranks Spanish among its highest-accuracy languages thanks to its huge training corpus. Drop in an mp4 and ViralMint returns word-level Spanish timestamps in seconds, then either burns word-by-word animated captions (the viral TikTok/Shorts style) or exports a clean .srt/.ass file. If the audio is in English (or any of 100+ languages) you can also auto-translate it into Spanish first via the translate-and-dub tool — useful for creators repurposing English content for the 500M+ Spanish-speaking audience across Spain and Latin America. Everything runs on your machine: the video never uploads, there's no per-minute cap, and there's no watermark.
How to add Spanish subtitles to a video
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Open the caption tool
Launch ViralMint and open Tools → Captions. It accepts mp4, mov, mkv and webm.
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Drop in your video
Local Whisper transcribes it into Spanish (Español) with word-level timestamps — on your machine, nothing uploads. If the audio is another language, translate-and-dub can convert it to Spanish first.
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Style or export
Burn word-by-word animated Spanish captions (viral / classic / bold), or export a standalone .srt / .ass file for any editor.
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Render the mp4
ViralMint burns the Spanish subtitles in with FFmpeg and writes the final mp4 — original untouched, zero watermark.
Frequently Asked Questions
Does it transcribe Latin American and European Spanish?
Yes. Whisper is trained on Spanish from across Spain and Latin America, so regional accents (Mexican, Argentine, Castilian, Colombian) all transcribe accurately. It outputs neutral Spanish text you can edit if you want a specific regional spelling.
Can I translate an English video into Spanish subtitles?
Yes. Use the translate-and-dub tool: ViralMint transcribes the original audio locally, translates the text to Spanish, and re-times the subtitles — so an English video gets accurate Spanish captions without re-recording.
What formats can I export?
Burn the Spanish subtitles directly into the mp4 as word-by-word animated captions (viral / classic / bold presets), or export a standalone .srt or .ass file to use in any editor.