How to Reload Chunks in Minecraft (F3 + A)

Press F3 + A. That is the whole of how to reload chunks in Minecraft Java Edition: hold F3, tap A, and the game rebuilds every chunk it currently has loaded around you. Bedrock Edition has no equivalent key, so there you leave the world and come back in.

A chunk is a 16×16 column of the world running from the void up to the build limit, and the game keeps only some of them loaded at a time. Now and then one of those columns draws wrong: a wall of nothing where the ground should be, a floating tree, a hole you can see the sky through.

Nothing is broken in your save when that happens. The world data is intact. What went stale is the picture your client built from it, and reloading chunks throws that picture away and draws it again.

What causes chunks to stop loading

Chunks load and unload constantly as you move, and the rendering that goes with it is the part that slips. A chunk whose render was built in the middle of an update can hold on to the half-finished version until something tells the client to build it afresh.

On a server, connection trouble is the other common cause. Chunk data arrives from the server in packets; if some of it never arrives, your client has nothing to draw and leaves a void. This is the version the hotkey often cannot fix, because there is no data sitting in memory to redraw.

Memory pressure makes both worse. Java Edition offers a render distance of 2 to 32 chunks, but 32 is only available when at least 1 GB is allocated to the game — below that the game caps you at 16. Pushing the slider past what the machine can comfortably hold is a reliable way to produce chunks that never finish drawing. Simulation distance is a separate setting, from 5 to 32 chunks, and it governs where entities and blocks actually tick rather than what you can see.

How to reload chunks in Minecraft with F3 + A

1. Stand in the area that looks wrong. The hotkey rebuilds what is loaded around you, so position matters.

2. Hold F3 and press A. Do not tap F3 on its own first. Held down, it works as a modifier and the debug screen stays shut.

3. Watch the chat line. Guides covering this hotkey consistently report a Reloading all chunks message appearing there. The Minecraft Wiki names the hotkey Reload Chunks and describes it as reloading all loaded chunks, without specifying any on-screen confirmation, so treat the message as a helpful sign rather than a guarantee.

4. Expect a brief freeze. The game is rebuilding every chunk render at once, which stutters for a second or two and then settles. The missing terrain should fill in.

One source of confusion worth clearing up: F3 + T is not this. That combination reloads resource packs, which is useful while editing textures and useless for a hole in the ground. The hotkey you want is A.

If F3 + A appears to do nothing

On a Mac, and on many Windows laptops, the function-key row controls brightness and volume by default, so F3 never reaches the game. Hold Fn as well, or turn on the system setting that makes F1, F2 and the rest behave as standard function keys. On Windows laptops the equivalent is a Fn lock setting, and holding Shift with the function key sometimes works instead.

If the keys are reaching the game and the chunks still look wrong afterwards, that is informative in itself: it means the client is drawing what it was given, and the problem is upstream.

Rejoin the world or the server

Quitting to the title screen and loading back in is the next step, and it is a genuinely different operation. The client discards everything and asks for the chunk data again from scratch, which fixes the case where a packet went missing. On a multiplayer server, logging out and back in does the same thing.

Where rejoining is not practical, walking or teleporting far enough away that the chunks unload and then returning has the same effect on the affected area. This is also what you want after tunnelling into brand-new terrain underground — the sort of thing that happens constantly while mining for iron at a fixed depth.

Reloading chunks on Bedrock Edition

Bedrock has no debug hotkeys, so there is no F3 + A and no direct equivalent. Leaving the world and rejoining is the standard fix, and on a Bedrock server the move-away-and-return approach works for the same reason it does on Java.

Bedrock also has the /tickingarea command, which marks an area as permanently active. That is a different tool for a different problem: it keeps chunks loaded while you are elsewhere, which helps farms keep running. It is not a way to redraw a chunk that has rendered badly in front of you.

If that didn't work

Restart the game. A fresh launch clears any render state the two steps above left behind, and it costs a minute.

Then look at render distance. Dropping it by several chunks, loading in, and raising it again forces a full re-render and relieves memory pressure at the same time. If the glitches only appear at high settings, that is your answer.

Shaders, OptiFine and rendering mods are worth ruling out next. Load the world in vanilla with no resource packs. If the chunks render cleanly there, the fault belongs to the mod and not to Minecraft.

Still not working

Persistent chunk problems in one specific place, surviving every reload and a vanilla launch, point at the saved world data rather than at rendering. Back the world up before going further, because repair tools edit the save in place and the changes cannot be undone.

On a server you do not run yourself, this is the point to raise it with whoever does — corrupt region files and chunk-loading limits are both server-side problems, and nothing you press on your keyboard will reach them.