Guide
How to translate a product demo video into other languages
There are three ways to translate a product demo video: add translated subtitles, replace the voice-over with a native one in each language, or re-film the product with its interface in that language. For most SaaS demos, a native voice-over with matching captions gives the best result for the effort, because the footage stays the same and only the voice changes.
Key takeaways
- Subtitles are the cheapest option, but viewers must read and watch at the same time.
- A native voice-over keeps the footage and swaps the language. It's the best value for demos.
- Languages run at different speeds: 60 seconds holds about 147 English words but only about 126 German ones. Rewrite to fit; don't just translate word for word.
- Decide formal or informal address (Sie or du, vous or tu) before writing, and keep it consistent with your product.
- ViralDub writes and voices narration directly in 22 languages, and Motion videos translate in one click.
The three options compared
| Option | What changes | Effort per language | Viewer experience | Use it when |
|---|---|---|---|---|
| Translated subtitles | Caption file only | Low | Reads while watching; misses detail on screen | Budget is tight or the audience reads English well |
| Native voice-over + captions | Voice, captions, end card | Medium (low with AI voice) | Feels made for them | Most product demos, ads and launches |
| Re-film in the localized UI | Footage, voice, captions | High | Best, if the product UI is translated | The product itself is fully localized |
Why word-for-word translation breaks the timing
A translated script rarely has the same length as the original. Some languages need more words for the same idea and some are spoken more slowly. If you paste a German translation over English footage, the voice will run long and fall out of sync with the screens. Rewrite each line to fit its scene instead.
| Language | Words in 60 s (conversational) | Note |
|---|---|---|
| English | 147 | Baseline |
| Spanish | 150 | Neutral Spanish works across Spain and Latin America |
| Portuguese (Portugal / Brazil) | 150 | Pick the variant: vocabulary and voice differ |
| Italian | 150 | Tu is common in consumer apps, Lei in formal B2B |
| French | 147 | Vous is the safe default for B2B |
| German | 126 | Long compound words; Sie for formal B2B, du for many startups |
| Dutch | 126 | Informal je is normal in Dutch SaaS copy |
| Polish | 126 | Decide on formal Pan/Pani or informal before writing |
| Finnish | 126 | Long words; captions wrap more often |
| Russian, Ukrainian | 126 / 147 | Separate languages and markets; don't reuse one for the other |
| Arabic | 147 | Modern Standard Arabic; captions read right to left |
| Japanese, Korean, Chinese | about 384 characters | Counted in characters; polite forms are standard |
A localization checklist for demo videos
- Choose formal or informal address and match the tone of your product's UI in that language.
- Localize numbers, dates and currency in the voice-over and captions (1,000.50 becomes 1.000,50 in German).
- Say it if the product interface stays in English, so viewers aren't surprised after signing up.
- Translate the end card and use a local URL or landing page if you have one.
- Pick a voice that suits the market: age, energy and accent all matter.
- Burn in captions for social feeds and upload a caption file per language on YouTube.
- Ask one native speaker to watch the final video before you publish it.
How ViralDub handles languages
ViralDub doesn't translate an English script after the fact. When you choose a language for a walkthrough, the director writes the narration in that language from the start, times each line to its shot using that language's speaking rate, and voices it with a native voice. For Motion videos, one click makes a translated version with a new voice-over and captions, without re-rendering the animation from scratch.
Frequently asked questions
What is the cheapest way to translate a product video?
Translated subtitles. They cost little but ask viewers to read while watching. An AI voice-over costs a little more and usually performs better for demos and ads.
Is AI voice-over good enough for product videos?
For demos, launches and onboarding, current AI voices sound natural in most major languages. Have a native speaker check the script for tone and terminology before publishing.
Do I need to translate my app's interface to make a localized demo?
No. Many teams keep the interface in English and localize the voice-over and captions. Say so in the video if the product itself is English-only.
Which languages does ViralDub support?
Narration in 22 languages: English, Portuguese (Portugal and Brazil), Spanish, French, German, Italian, Dutch, Polish, Swedish, Danish, Norwegian, Finnish, Turkish, Russian, Ukrainian, Arabic, Hindi, Indonesian, Japanese, Korean and Mandarin Chinese.
How long does it take to make a video in another language?
With ViralDub, about the same time as the original: a 60-second walkthrough usually takes 4 to 6 minutes to produce in any language.