How to translate YouTube subtitles with Mono.

Step 1

Add Mono Translate Pro to Chrome

Open the Chrome Web Store page and press “Add to Chrome”.

1. Pin Mono to your toolbar so the side panel is one click away.
2. Works in Google Chrome on Windows, macOS, Linux and ChromeOS.

Already installed? Make sure you have the latest version — updates arrive automatically.

Add to Chrome

Step 2

Create your Mono account

Sign up with your email or Google. Your 3-day Pro trial starts right away.

1. Your plan syncs to the extension by itself — no codes to copy.
2. Use the same account on every computer.

Subscriptions are handled here on monotranslatepro.com, never inside the Chrome Web Store.

Try Pro free for 3 days

Step 3

Get your free Gemini API key

Professional Translation uses your own key from Google. It's free and takes about a minute.

1. Open Google AI Studio and sign in with your Google account.
2. Press “Create API key” and copy it.
3. Open the Mono side panel and paste the key into the Gemini field. It saves automatically and the dot turns green.

You only do this once. Mono reconnects by itself and switches to another Gemini model when one reaches its daily free limit.

Open Google AI Studio

Step 4

Open a video and press Translate

Choose Professional Translation, pick your language and press Translate — in the side panel or in the Player Dock.

1. Mono finds the best captions: the creator's subtitles first, YouTube's automatic captions otherwise.
2. You can start watching while the rest of the video is still being translated.
3. The progress bar moves smoothly and tells you if it's waiting on Google.

Need the gist instantly? Switch to Fast Translation — no key required.

Step 5

Make the subtitles yours

In the Subtitle tab, style the original and the translation separately.

1. Font, size, weight and colour for each line.
2. Outline, shadow and background for clean contrast on any scene.
3. Position and entrance animation — or drag the lines where you want them.

Everything you change previews live, so you can see it before you watch.

Step 6

Keep learning in Mono Workspace

When a line is worth remembering, open it in Workspace and follow the map: Flow, Echo, Connect.

1. Flow — understand with just enough help.
2. Echo — recall, replay the real voice and say it out loud.
3. Connect — use the phrase in your own sentence.

Your saved moments stay linked to the exact second of the original video.

Open Mono Workspace