In this Unity tutorial, I show you the easiest, most beginner-friendly way to make a clean 2D health bar that instantly makes your game feel more professional. We start from zero by creating a Canvas, then adding two UI Image objects: one for the background and one for the fill. The “magic” step is on the fill image—switching the Image Type from Simple to Filled, setting Fill Method to Horizontal, and Fill Origin to Left. Once you see the Fill Amount slider working in the Inspector, you’ll understand why this technique is so reliable. After the UI setup, I build the logic with a simple C# script (HealthBarManager). I define currentHealth, maxHealth, and a public Image reference so you can drag-and-drop your fill image in the Inspector. Then I add TakeDamage (clamped so health never drops below zero) and the core UpdateHealthBar function, where I calculate the ratio (currentHealth / maxHealth) and assign it directly to the Image.fillAmount. Finally, I test it with simple controls—Space to take damage and Q to heal—so you end up with a fully functional dynamic health bar you can plug into any project. If you want it to look even better, I recommend smoothing the transitions with the math/blur approach I mentioned.