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Once you have installed the extension (see Install extension from zip), you have 3 ways to set the API Key:

Way 1

Enter directly in the extension popup

Way 2

Edit the configs.json file

Way 3

Use a URL in the browser

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Way 1. Enter directly in the extension

After installing the extension, click the extension icon in your browser toolbar to open the popup.
Click the extension icon
In the popup, paste your API Key into the Your client key field, then click outside to save.
Enter client key in the extension
If you don’t have an API Key yet, sign in at omocaptcha.com and grab it from your account page.

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Way 2. Enter directly in a file inside the extension

Click here to open the folder containing the extensions. The extract password is 12345. After downloading and extracting, locate the configs.json file inside the extension folder.
configs.json file in the extension folder
Open the file with any text editor (Notepad, VS Code, Sublime Text…) and find the line containing YOUR_CLIEN_KEY. Replace it with your real API Key and save the file.
Replace YOUR_CLIEN_KEY with your API Key
Example before:
configs.json
After:
configs.json
After editing configs.json, open chrome://extensions/ and click the reload button on the OMOCaptcha extension so the change takes effect.

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Way 3. Set via URL in the browser

Once the extension is installed, simply visit the following URL — the extension will automatically capture and save the API Key:
Replace YOUR_API_KEY with your real API Key and paste it into the browser’s address bar.
Set API Key via URL
When the page shows SET KEY OMOCAPTCHA, the key has been saved successfully.
Never share your API Key. If leaked, regenerate a new one in your dashboard.