Is AI translation good enough for subtitles, or do I need a human translator?

AI translation gives you a usable draft, and for tutorials and informational videos a draft plus a review by a fluent speaker is often enough. The review catches formality levels, idioms, jokes, names and terms the model got wrong. For brand campaigns, legal or medical content, pay for a professional translator.

What happens to timing when the translation is longer or shorter than the original?

A translated subtitle file normally keeps the original cue timings, so each line shows while the speaker says it, whatever its length. The problem is reading time: if a translated line is too long to read in its window, shorten it during review rather than stretching the timing.

How to Add Multilingual Subtitles to Your Videos

The work in multilingual subtitles is mostly review, not generating files. Getting a translation is quick now; making sure it reads well and displays correctly in each language is where the time goes.

The Workflow

Transcribe the original language and correct it. Every error in the source carries into each translation, so fix names, technical terms and numbers once, here.
Translate the corrected subtitles into each target language.
Have a fluent speaker watch each language against the video. Reading the subtitle file alone misses lines that are too long to read in time.
Publish. Either upload one subtitle file per language, or burn one language into the video.

Uploaded tracks suit YouTube, Vimeo and web players, where viewers pick a language and can switch captions off. Burned-in subtitles suit Reels, TikTok and Shorts, where captions are part of the picture, but each burned-in video carries only one language.

Uploading several languages to YouTube

In YouTube Studio, open Subtitles, select the video and choose Add language. Pick the language, then upload that language's SRT file with timing. Repeat for each language. Viewers choose among them in the player's subtitle settings.

Write the Source With Translation in Mind

Keep sentences short. Short lines translate more cleanly and are easier to fit on screen in languages that run long. German, for example, tends to take more space than English.
Avoid idioms and slang, or flag them for the reviewer. "Piece of cake" translated word for word means nothing.
Watch cultural references. A reference that is obvious to your home audience may need explaining or replacing.

When Subtitles in Another Script Look Broken

Missing glyphs. Many fonts have no Chinese, Japanese or Korean characters, so burned-in text shows empty boxes. Use a font with wide script coverage, such as the Noto Sans family. For uploaded tracks the player chooses the font, so this mainly affects burn-in.
Garbled characters. Save SRT and VTT files as UTF-8. If an older player or editor still shows garbage, the file was probably saved in a legacy encoding; the free subtitle encoding converter re-saves it in your browser.
Bad line breaks. Chinese, Japanese and Thai don't put spaces between words, so tools that break lines at spaces can produce one very long line. Check the longest lines by eye.
Right-to-left text. In Arabic, Hebrew, Persian and Urdu, punctuation and embedded numbers or English words can land on the wrong side in burned-in subtitles. Render a short sample before doing a whole video.

Which Languages First

Use your own data. YouTube Studio's audience analytics show where your viewers are; Instagram and TikTok insights show audience location too. Start with the two or three languages where you already have viewers. Each added language means another review pass and another track to maintain, so add more only when the first ones show results.

Where Picute Fits

Picute transcribes the source in 60 languages (full list), lets you correct the text in the editor, and translates the subtitles into another language with AI. You can export each version as SRT or VTT for upload, or as an MP4 with the subtitles burned in. Translation does not use credits; only transcription does.

The translation is an AI draft. Picute does not include human review, and it does not upload to YouTube for you.