Any video, any language, subtitled by AI in minutes.
Subtitle + AI listens to your video, writes the subtitles, and can
translate them into 30+ languages — all at once, side by side. Run it
fully offline with the local AI engine, or plug in your own OpenAI/DeepL
key for extra speed. Export as subtitle files, an embedded track, or burned directly into
the picture with your own font, size and color.
Local AI engine — nothing leaves your PC
Edit every line before exporting
Files, embedded track, or burned in
DOWNLOAD-SIU · SUBTITLE + AI
30+ languagesLocal or APILive style preview
30+ languagesLocal AI — 100% offlineOpenAI & DeepL supportedSubtitle files · Embed · Burn-inSRT · VTT · ASS · SSA · SBVEditable before exportFont, size, color, outlineLoad your own .srtBatch — analyze every file at once30+ languagesLocal AI — 100% offlineOpenAI & DeepL supportedSubtitle files · Embed · Burn-inSRT · VTT · ASS · SSA · SBVEditable before exportFont, size, color, outlineLoad your own .srtBatch — analyze every file at once
30+
Languages
2
Engines — local or API
3
Output modes
0
Uploads, with the local engine
24/7
Support
See it running
One video in, six languages out — at the same time
Pick as many target languages as you want up front. The AI transcribes once
and translates into every one of them, and you can flip between languages in the editor
without re-running anything.
English
Live burned-in preview over the real video, with every timed line editable below.
Português
Same video, same timestamps — just switch the language tab.
日本語
Non-Latin scripts translate and render correctly, style and all.
Two engines, your choice
Run it offline, or bring your own key
Nobody forces a subscription on you just to get subtitles.
Local AI — offline
Transcribes and translates on your own PC
Whisper (for transcription) and a local translation model run right on your machine — no
internet needed, no audio or text ever sent anywhere. The engine downloads the first time
you use it (transcription is a light ~160MB; translation is a bigger local model, ~1.1GB)
so the app installer itself stays small.
100% private — nothing leaves your PC
No API key, no subscription, no per-use cost
Download the AI once, use it forever offline
OpenAI
Transcribes AND translates
Bring your own OpenAI key for faster processing on their servers instead of your PC.
Needs a paid account with balance loaded.
DeepL
Translation only, very fast
Already have transcripts and just need a translation pass? A DeepL key handles that on
its own, independent of OpenAI.
Automatic fallback
You never pick which key does what
Add a key, choose its provider, and Download SIU figures out on its own what it's good
for — and tries the next saved key automatically if one fails or runs out of balance.
Your subtitles, your way
Files, an embedded track, or burned right in
Subtitle files
SRT, VTT, ASS, SSA or SBV
Plain subtitle files saved next to the video — the video itself is never touched. Pick
the format from a dropdown; it's remembered for next time.
Embed in video
Instant, no re-encoding
Every language becomes its own selectable track inside a copy of the video — the viewer
picks which one to show, same as a movie's subtitle menu.
Burn in
Draws the text onto the picture, styled the way you like
Font family, size, text color, outline thickness and color, an optional background box,
and top/bottom position — with a live preview right over the real video
before you export anything. Edit any line's text or timing first if the AI got something
wrong. Save a style once and apply it to every other file waiting in the queue.
Load your own .srt/.vtt/.ass instead of transcribing — style and burn it the same way
Once a file starts processing, its settings lock — no accidental mid-job changes
Analyze every queued file at once with a single button
Matches your theme
Five themes. Same tab.
Subtitle+AI looks like the rest of Download SIU — pick a theme once in Options
and every tab follows.
Violet
Crimson
Included with Download SIU
One app, one license, every tab
Subtitle + AI isn't a separate purchase — it's one of the tabs inside Download SIU, alongside
the downloader, Convert and Audio Extract. Start the 5-day trial right inside the app, or
pick a plan.
