Debug Screen and F3 Keys

How it works

Opening	Pressing and releasing F3 alone shows or hides the debug screen. If F3 was used together with another key, releasing it does not toggle the screen.
Choosing the lines	F3 + F6 opens Debug Options. Each line can be set to Always, In F3 or off. There is a Default profile and a Performance profile.
Default lines	With the Default profile the debug screen shows the game version, FPS, server tick time, memory, system information, position lines and the render settings line. Biome, light, local difficulty and the day counter are off until they are turned on in Debug Options.
Performance profile	Shows FPS at all times, and server tick time, GPU use, memory and the render settings line in the debug screen.
Reduced Debug Info	With Reduced Debug Info on, hitboxes, chunk borders, Copy Location and Copy Data do not work and most lines are hidden. The section position line stays.
Rebinding	F3 and every letter in the table are key bindings in the Debug category and can be changed.
Crash key	Holding F3 + C for 10 seconds crashes the game on purpose. Chat counts down while the keys are held.


F3	Shows or hides the debug screen	On release
F3 + A	Reloads all chunks
F3 + B	Shows or hides hitboxes	Not with Reduced Debug Info
F3 + C	Copies the location as a teleport command	Not with Reduced Debug Info

F3 + C held 10 seconds	Crashes the game
F3 + D	Clears chat
F3 + G	Shows or hides chunk borders	Not with Reduced Debug Info
F3 + H	Turns advanced tooltips on or off	Saved in options

F3 + I	Copies the targeted block or entity as a command	Shift copies the client's data
F3 + L	Starts or stops profiling	Runs 10 seconds
F3 + N	Switches between Spectator and the previous game mode	Needs command permission
F3 + P	Turns pause on lost focus on or off	Saved in options

F3 + S	Saves the dynamic textures to a folder
F3 + T	Reloads resource packs
F3 + V	Prints client version info in chat
F3 + X	Turns improved transparency on or off	Saved in options

F3 + F4	Opens the game mode switcher	F4 selects the next mode; needs command permission
F3 + F6	Opens or closes Debug Options
F3 + Esc	Pauses without the Game Menu
F3 + 1	Shows or hides the profiler chart	Number keys then pick a section

F3 + 2	Shows or hides the FPS charts
F3 + 3	Shows or hides the network charts
F3 + 4	Shows or hides the lightmap texture


Minecraft	Game version	Yes
fps	Frames per second, frame limit and display refresh rate	Yes
Integrated server	Server tick time in milliseconds, packets sent and received	Yes
Mem	Memory in use, allocation rate and allocated memory	Yes

Java, CPU, Display, Window	Java version, processor, screen and window size, graphics card and driver	Yes
XYZ	Exact coordinates of the player	Yes
Block	Coordinates of the block the feet are in	Yes
Chunk	Chunk coordinates, position inside the region and the region file	Yes

Facing	Compass direction, the axis it points along, and the two view angles	Yes
Dimension line	Dimension name and the number of force loaded chunks (FC)	Yes
Section-relative	Position inside the 16 block section, 0 to 15 on each axis	Yes
Filtering, Terrain Rendering	Transparency, clouds, biome blend, texture filtering and terrain render mode	Yes

3D crosshair	Replaces the crosshair with three colored axis lines	Yes
Biome	The biome at the feet	No
Client Light	Light level at the feet, with sky light and block light	No
Local Difficulty	Regional difficulty and its clamped value, in singleplayer	No

Day	Number of days passed in the Overworld	No
Speed	Movement speed in blocks per tick	No
CH, SH	Heightmap heights at the player's column	No
Targeted Block, Targeted Fluid	Position, properties and tags of the block or fluid looked at	No

Targeted Entity	The entity looked at and its tags	No
SC	Mob counts per spawn category	No
GPU	Graphics card use in percent	No