Japanese and English Subtitles for Your Videos: Transcription, Translation and Timing
To add Japanese or English subtitles to a video, you need three things: an accurate transcript of what is said, a translation written for subtitles rather than for print, and timing that matches the speech. The translation is the hard part. Subtitles have strict space limits, so a good subtitle translator shortens and rewrites while keeping the meaning, and Japanese subtitles follow their own conventions. Start with a clean transcript, decide who the audience is and leave time for a native speaker to check the result on screen.
The steps
- Transcription. A written record of everything said, in the original language. See Japanese transcription.
- Translation. Turning the transcript into subtitle-length lines in the target language.
- Timing. Setting when each subtitle appears and disappears, usually in a subtitle file such as SRT or VTT.
- Review on screen. Watching the video with subtitles to check reading speed, line breaks and meaning.
Some projects only need a transcript and translation, for example when your video editor or platform handles timing. Decide early which steps you need.
Why subtitle translation is different
People read subtitles while watching and listening, so lines have to be short and quick to read.
| English subtitles | Japanese subtitles | |
|---|---|---|
| Reading speed | Commonly around 15 to 17 characters per second, depending on the platform and audience. | A common rule of thumb is about four characters per second. |
| Lines | Usually no more than two lines. | Usually no more than two lines, with a strict character limit per line. |
| Style | Condensed, natural English. | Condensed Japanese, often with spaces in place of some punctuation. |
Because Japanese packs a lot of meaning into few characters but is read more slowly per character, subtitles in either direction need real rewriting, not just translation. Exact limits vary by platform, so check the specification for where your video will appear.
What makes Japanese–English video tricky
- Politeness and tone. Japanese speakers shift between polite and casual speech, which carries meaning English doesn’t mark the same way. See casual vs polite Japanese.
- Unspoken subjects. Japanese often leaves out who is doing what. The translator has to work it out from context.
- On-screen text. Signs, captions and slides in the video may need translating too. Mention them in your brief.
- Names and terms. Provide a list of names, products and technical words so they are spelled consistently.
Who the subtitles are for
The same video might need different subtitles for different audiences. A product video for Japanese customers should sound natural and polished. An interview for internal research should stay closer to what was actually said. Training videos may need a balance. Tell your translator the audience and the purpose, as you would for any translation project.
Machine subtitles
Automatic captions and machine translation have improved, and they can be useful for a rough idea of what is said. For anything public, they still miss names, mishear words and produce stiff or wrong translations, especially from Japanese. Many teams use them as a first draft and have a human correct the transcript and rewrite the translation.
Preparing your files
- Send the final edit of the video, not a draft that may change.
- Share any script, slides or existing transcript.
- Say which platform it is for and whether you need a subtitle file or text only.
- Agree on how to handle on-screen text, songs and background speech.
Common questions
Can I subtitle from the script instead of the video?
Only if speakers followed the script exactly. Most don’t, so check against the audio.
Are subtitles or a voice-over better?
Subtitles are quicker and cheaper and keep the original voices. Voice-over suits audiences who won’t read along, but it is a different, larger project.
How long does it take?
It depends on the length of the video, the number of speakers and audio quality. Allow time for the on-screen review.
If you have Japanese or English video that needs transcribing and translating, tell us about the video and where it will be shown. You can get in touch for a free consultation.