Why upload your own translation instead of auto-translate
YouTube's auto-translate only runs in the viewer's player; it is not indexed. A subtitle track you upload for a language is used for search and recommendations in that language, shows up as a real caption option, and can be edited. Channels that add Spanish, Portuguese and Hindi tracks routinely see 20–40% of views come from those languages.
Step 1 — download your existing captions
YouTube Studio → Content → your video → Subtitles → the three-dot menu next to your language → Download. Choose .srt (or .sbv, YouTube's own format). If you only have auto-generated captions, publish them first, then download; fix obvious errors before translating because errors get translated too.
Step 2 — translate the file
Drop the .srt or .sbv into SubFlip, pick the languages (you can add up to five at once), choose the register — formal for tutorials and business, casual for vlogs — and translate. You get one file per language, named like video.es.srt, with timing untouched.
Step 3 — upload as a new language
Back in Subtitles → Add language → pick the language → Upload file → With timing → select the translated file → Publish. Repeat per language. The track appears within minutes; search impact takes days to weeks as YouTube reindexes.
Which languages are worth it
Look at YouTube Analytics → Audience → top geographies and subtitle usage. As a rule of thumb for English channels: Spanish, Portuguese (Brazil), Hindi, Indonesian, Japanese. For Korean channels: English, Japanese, Vietnamese, Indonesian, Spanish.
Common problems
Upload rejected: the file is probably not UTF-8 or has a stray line — run it through the subtitle cleaner. Subtitles drift: you translated a file from a different cut of the video; use the sync tool to shift or stretch. Lines too long: pick a tool that enforces line length, or re-run with the formal register which tends to be shorter in CJK languages.
Tools mentioned
Questions
- SRT or SBV — which should I download?
- Either works. SBV is YouTube's native export and uploads back without conversion; SRT is more portable if you also use the file elsewhere.
- Can I upload several languages at once?
- YouTube takes one file per language, but you can translate into several languages in one go and upload them one after another.
- Will translated subtitles help my video rank?
- Uploaded subtitle tracks are indexed for that language; auto-translated ones are not. It is the cheapest way to enter a new language market.