How to Get a Free Microsoft Azure Speech API Key

Microsoft Azure offers one of the most advanced neural text-to-speech engines in the industry, featuring natural intonation, diverse accents, and voice emotion styles.

By default, TTS Engine includes a free built-in speech engine that requires zero configuration. However, connecting your own Azure Speech API key unlocks higher control, fine-tuned pauses, and expressive emotional voice styles.

Best of all, Microsoft provides a Free Tier (F0) that grants 500,000 characters per month at no cost. This guide walks you through setting up your free resource step by step.

1. Navigate to the official Azure Free Account page and Click “Try Azure for free”
2. Sign in with your standard Microsoft account (Outlook, Hotmail, or Microsoft 365).
3. Complete the registration steps. Microsoft requires a credit or debit card for identity verification during sign-up, but you will not be charged unless you explicitly remove the spending limit or upgrade.
4. Go to the Azure Portal and select Speech Services under the Services category.
5. Click on the Speech Services dashboard.
6. Create Speech service.
7. Subscription: Select your active subscription (e.g., Azure subscription 1, Azure for Students or Free Trial).
8. Resource Group: Click Create new and name it something clean, such as demo.
9. Region: Choose a region close to your location (for example, eastus, westus o westeurope). Keep note of this region name.
10. Name: Give your service a unique identifier, like tts-engine.
11. Pricing Tier: Select Free F0 (500K characters per month). Note: Azure allows one F0 Speech resource per subscription.
12. Click Review + create at the bottom.
13. After validation passes, click Create. Deployment typically takes under 60 seconds.
14. When deployment completes, click Go to resource.
15. In the left-hand navigation menu under the Resource Management section, click Keys and Endpoint. You will see two keys and your region:
    • KEY 1: Click the copy icon next to the key.
    • Location/Region: Note the short identifier (e.g., eastus, westus2, westeurope).

Security Note: Never share your API key publicly or commit it to public repositories.

Configure TTS Engine

Now that you have your credentials:

• Get TTS Engine from the Microsoft Store.
• Open TTS Engine on your desktop.
• In the top navigation bar, click ⚙️ API.
• Paste your key into the Azure API Key field.
• Enter your region code into the Azure Region field (e.g., eastus).
• Click Aceptar / Save.

Once configured:

• The Line pause slider activates, allowing millisecond precision between sentences.

• Compatible neural voices (marked with a star ⭐ in the catalogue) will display their available Emotion / Style dropdown (such as cheerful, sad, whispering, or terrified).

• All requests run through your personal quota. If you leave the fields empty at any time, TTS Engine immediately reverts to its default built-in free engine.