How to Use the F3 Debug Screen (Java)

Guide Java Bedrock

Quick answer: Press F3 in Java Edition to open the debug overlay: coordinates, biome, light level, FPS and chunk info. Useful combos: F3+G chunk borders, F3+B hitboxes, F3+C copy coordinates, F3+Q lists every shortcut.

What you need

Minecraft Java Edition
A keyboard (Fn + F3 on some laptops)
No cheats needed - F3 always works

Step by step

Press F3 in-game. The overlay shows two columns of data; press F3 again to close it.
Read your position: XYZ is your exact spot, Block is the rounded block, Chunk is your chunk position. Y is your height - diamonds at Y=-59.
Find the biome, light level and difficulty on the left column; FPS and version sit at the top.
F3 + G draws chunk borders - essential for slime chunks and farms.
F3 + B shows entity hitboxes and where mobs are looking - find hidden mobs through walls.
F3 + C copies your current coordinates to the clipboard (hold it - it crashes the game after 10 seconds as a manual crash key).
F3 + A reloads chunks, F3 + T reloads textures, F3 + Q shows the full shortcut list.

Java vs Bedrock

Java only. Bedrock has no F3 screen - enable Show Coordinates in world settings and use the paper doll and FOV instead.

Versions: The debug screen exists in every Java version. The exact layout shifts between releases but coordinates, light and biome are always there.

Frequently asked questions

Does F3 need cheats?

No - the debug screen works in every Java world, even with cheats off. Some multiplayer servers hide coordinates with reducedDebugInfo.

How do I see the light level for mob spawns?

The 'Client Light' line shows block and sky light at your position. Hostile mobs spawn at block light 0 in current versions.