Determining the “best” online logo design service can depend on your specific needs and preferences. However, some widely regarded options include:

1. **99designs:** Connects you with freelance designers who submit designs based on your brief.

2. **Canva:** Offers an easy-to-use platform with customizable templates for logo creation.

3. **LogoMaker:** Provides a simple and affordable solution with a user-friendly interface.

4. **Looka:** Uses AI to generate logo ideas based on your preferences and allows for customization.

Ultimately, the best choice depends on factors like budget, design preferences, and how involved you want to be in the design process.