Length and layout
English is many more characters, each read faster than the Japanese original. Both languages are written left to right, so the layout does not change — only the wording and line length do.
日本語 → English
Translate Japanese video into English subtitles
Upload a video in Japanese. SubFlow transcribes the speech, translates every caption into English, and keeps both languages on the same timeline so you can review them side by side — then export subtitles, a subtitled video, or a English dub.
30 free minutes monthly · No credit card
What changes
Japanese and English, side by side.
| Japanese (spoken) | English (subtitles) | |
|---|---|---|
| Script | Japanese (kana and kanji) | Latin |
| Direction | Left to right | Left to right |
| Reading speed | well below Latin scripts chars/sec | 15–17 chars/sec |
| Line length | about 13–16 chars | about 42 chars |
| AI dub voice | ja-JP | en-US |
Getting English right
English subtitles read fastest when a line breaks after a clause, not mid-phrase — the editor lets you move the break without touching the timing.
Workflow
From Japanese to English in three steps.
Upload the Japanese video
Add a video or audio file. SubFlow transcribes the Japanese speech into timed captions.
Translate into English
Pick English as the target. Every caption is translated with the surrounding lines as context, then shown beside the original.
Review and export
Fix names and terms, split any caption that runs long, then export English or bilingual subtitles, a subtitled video, or a English dub.
Common questions
Japanese to English, answered.
Can SubFlow recognise Japanese speech automatically?
Yes. Leave the source on automatic detection or pick Japanese yourself. Japanese has no spaces between words; captions are cut by meaning and timing rather than at word boundaries.
Will the English subtitles fit on screen?
English reads comfortably at 15–17 characters per second with about 42 characters per line. English is many more characters, each read faster than the Japanese original. Review the longest captions and split any that crowd two lines.
Can I dub a Japanese video into English?
Yes, on the Pro plan. The English dub uses a en-US voice and is spoken from the translated subtitles, so correcting a line in the editor changes what the voice says.
Can I export Japanese and English together?
Yes. Export the English subtitles alone, the original Japanese, or a bilingual SRT with both on each caption — or burn either into the video.