JapaneseSubs — Japanese to English Subtitle Generator (100% Offline)

Three Steps. That's It.

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Select Video

Pick any Japanese video from your computer. MP4, MKV, AVI, WebM — all formats supported.

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AI Does the Work

Whisper transcribes the Japanese audio. A specialized model translates it to English.

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Get Subtitles

Timed .srt file ready for VLC, MPC, mpv — or burn them directly into the video.

Subtitle Any Japanese Video in Minutes

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Variety Shows & Talk Shows

Japanese variety TV almost never gets subtitled. Finally understand your favorite shows and comedians.

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J-Dramas & Movies

Only the biggest titles get official subs. Hundreds of dramas, indie films, and specials go untranslated every year.

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YouTube & Live Events

VTuber archives, cooking channels, concerts, interviews — subtitle any Japanese content you want to understand.

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JapaneseSubs Handles It All

Generate accurate, timed English subtitles for any Japanese video — on demand, on your machine, in minutes.

Your Videos Stay on Your Computer. Period.

Other services make you upload your files to their servers. Think about that for a second. JapaneseSubs runs 100% locally — no uploads, no accounts, no trace.

	JapaneseSubs	Cloud Services
Where processing happens	✓ Your computer	✗ Their servers
Who sees your files	✓ Only you	✗ Unknown
Works offline	✓ Yes	✗ No
Data collection	✓ None	✗ Analytics & logs
Account required	✓ No	✗ Yes (with email)

🔌 Don't believe us? Disconnect your internet and it still works perfectly.

What You Get

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Accurate Japanese speech recognition

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Natural English translation

Specialized 14B-parameter Japanese→English model trained for natural, readable subtitles — not robotic machine translation

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Burn subtitles into video

Optionally hardcode subtitles directly into your video file with one click — no extra software needed

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Batch processing

Queue up multiple videos and let it run overnight. Come back to a folder of subtitled content.

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GPU acceleration

GPU with at least 10GB VRAM? Process a 2-hour video in ~8 minutes. CPU-only works too, just takes longer.

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All video formats

MP4, MKV, AVI, WMV, MOV, WebM — drop any video file and it just works

Common Questions

How good are the subtitles?

Very good for dialogue and conversation. The translation model is specifically trained on Japanese→English and produces natural, readable text. It handles casual speech, slang, and context well. It won't catch every poetic nuance a human translator would, but it's easily good enough to follow along and enjoy.

How long does processing take?

With a GPU (10GB+ VRAM): ~8-15 minutes for a 2-hour video. CPU only: ~45-90 minutes depending on your hardware. You can queue multiple videos and walk away.

Is it really 100% offline?

Yes. After the one-time setup (downloading AI models), everything runs locally. You can disconnect your internet and it works exactly the same. Zero network calls during processing.

What if it doesn't work for me?

30-day money-back guarantee, no questions asked. Email support@japanesesubs.app and you'll get a full refund.

What are the system requirements?

Minimum: Windows or Linux, 10 GB free RAM, 15 GB free disk space, Python 3.8+.
Recommended: GPU with 10GB+ free VRAM — NVIDIA, AMD, or Intel (for much faster processing).

Why not just find fan-subs?

Most Japanese content outside mainstream anime never gets subtitled. Variety shows, indie dramas, YouTube creators, live events — none of it. JapaneseSubs generates subtitles for any Japanese video, on demand — no searching forums, no dead links, no waiting for someone else to translate it.

What if my computer is slow?

It'll still work — just takes longer. On CPU-only, expect about 45-90 minutes per 2-hour video. Queue your videos, let it run in the background, and come back later. A GPU with 10GB+ VRAM speeds things up 3-5x.

What types of Japanese content does it work with?

Any Japanese video — anime, J-dramas, variety shows, movies, YouTube videos, VTuber archives, interviews, concerts, cooking shows, and more. If it has Japanese audio, JapaneseSubs can subtitle it.

English Subtitles for
Any Japanese Video