Length and layout
Vietnamese is about 10–20% longer than the English original. Both languages are written left to right, so the layout does not change — only the wording and line length do.
English → Tiếng Việt
Translate English video into Vietnamese subtitles
Upload a video in English. SubFlow transcribes the speech, translates every caption into Vietnamese, and keeps both languages on the same timeline so you can review them side by side — then export subtitles, a subtitled video, or a Vietnamese dub.
30 free minutes monthly · No credit card
What changes
English and Vietnamese, side by side.
| English (spoken) | Vietnamese (subtitles) | |
|---|---|---|
| Script | Latin | Latin with tone marks |
| Direction | Left to right | Left to right |
| Reading speed | 15–17 chars/sec | 15–17 chars/sec |
| Line length | about 42 chars | about 42 chars |
| AI dub voice | en-US | vi-VN |
Getting Vietnamese right
Vietnamese depends on tone marks for meaning, so the subtitle font must render them; the burned-in export uses a font that does.
Workflow
From English to Vietnamese in three steps.
Upload the English video
Add a video or audio file. SubFlow transcribes the English speech into timed captions.
Translate into Vietnamese
Pick Vietnamese 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 Vietnamese or bilingual subtitles, a subtitled video, or a Vietnamese dub.
Common questions
English to Vietnamese, answered.
Can SubFlow recognise English speech automatically?
Yes. Leave the source on automatic detection or pick English yourself. Accents, fast speech and overlapping speakers are handled well by the Whisper model; background music is the most common cause of a dropped line.
Will the Vietnamese subtitles fit on screen?
Vietnamese reads comfortably at 15–17 characters per second with about 42 characters per line. Vietnamese is about 10–20% longer than the English original. Review the longest captions and split any that crowd two lines.
Can I dub a English video into Vietnamese?
Yes, on the Pro plan. The Vietnamese dub uses a vi-VN voice and is spoken from the translated subtitles, so correcting a line in the editor changes what the voice says.
Can I export English and Vietnamese together?
Yes. Export the Vietnamese subtitles alone, the original English, or a bilingual SRT with both on each caption — or burn either into the video.