The Basic Steps to Build Your Nether Portal

A Nether portal is a rectangular frame made of obsidian blocks that opens a doorway to the Nether dimension. To build one, you need at least 10 obsidian blocks arranged in a 4×5 rectangle (the frame itself, not filled in). You light it on fire, and the purple swirling gateway appears inside the frame.

The fastest way to get obsidian is to find lava and pour water on it. Lava appears naturally in caves, ravines, and the Nether itself. When water touches lava, it hardens into obsidian. You can also mine obsidian directly with a diamond or netherite pickaxe if you find it underground, but the water-and-lava method is usually faster when you're starting out.

Key Takeaways

  • You need 10 obsidian blocks minimum, arranged in a 4×5 rectangle frame with the inside left empty.
  • The fastest way to get obsidian early is to find lava, pour water on it, and mine the hardened blocks with a diamond pickaxe.
  • Light the inside of the frame on fire using flint and steel, a fire charge, or a burning block to set up the portal.
  • The portal works both ways—you can travel from the Overworld to the Nether and back through the same frame.
  • Portals are safer to build in a flat, open area away from mobs and lava pools.

Finding and Mining Obsidian

Obsidian is a dark purple-black block that takes a long time to break. You cannot mine it with a wooden, stone, or iron pickaxe—you need a diamond pickaxe or better. If you do not have a diamond pickaxe yet, the water-and-lava method is your best path forward.

To use the water-and-lava method, find a lava pool or lava flowing down a cave wall. Hold a bucket of water and pour it directly onto the lava source block. The lava will harden into obsidian when ready. You can then mine the obsidian with any pickaxe. Repeat this process until you have 10 blocks. This method works in caves, ravines, and even the Overworld surface if you find lava exposed.

If you already have a diamond pickaxe, you can mine obsidian directly from the ground. Obsidian forms naturally near lava lakes underground and in the Nether. Mine it by holding down the attack button—it takes about 9 seconds per block with a diamond pickaxe.

Arranging the Obsidian Frame

The portal frame must be a hollow rectangle. The standard size is 4 blocks wide and 5 blocks tall, which uses exactly 10 obsidian blocks. You can also build it 5 wide and 4 tall—the dimensions swap, but the block count stays the same. Larger frames (up to 23×23) also work, but they waste obsidian.

Place the obsidian blocks in this pattern: four blocks on the bottom, three blocks on each side (left and right), and four blocks on top. The inside must be completely empty—do not fill it with obsidian. The empty space is where the purple portal will appear once you light it.

You can build the frame on the ground, against a wall, or even floating in the air. The only rule is that the frame must be complete and the inside must be open. Mobs can spawn inside the frame before you light it, so build it in a safe area away from caves and dark corners.

Lighting the Portal on Fire

Once your obsidian frame is built, you need to set the inside on fire. You can do this with flint and steel, a fire charge, or by placing a burning block (like fire or lava) inside the frame. Flint and steel is the most common method because it is straightforward to craft and reusable.

To make flint and steel, you need one flint and one iron ingot. Flint drops from gravel when you mine it (usually 1 out of every 10 blocks). Iron ingots come from smelting iron ore in a furnace. Once you have both, craft them together at a crafting table to get flint and steel.

Hold the flint and steel and right-click (or use your interact key) on the inside of the obsidian frame. A small flame will appear, and the entire frame will fill with purple swirling blocks within a second or two. The portal is now active and ready to use. Walk into the purple area to travel to the Nether.

What Happens When You Enter the Portal

When you step into the active portal, the screen will flash and you will be transported to the Nether. The Nether is a dangerous dimension filled with lava, fire, and hostile mobs like ghasts and blazes. You will spawn near a Nether portal frame that matches the one you built in the Overworld.

The Nether portal you find in the Nether is already lit and ready to use. You can walk back through it to return to the Overworld, and you will appear near your original portal. If you break the obsidian frame in either dimension, the portal stops working until you rebuild it.

Common Problems and How to Fix Them

If your portal does not light up, check that the frame is complete with no missing blocks and that the inside is completely empty. A single obsidian block in the middle will prevent the portal from forming. Also make sure you are using flint and steel (or a fire charge) correctly—right-click on the inside of the frame, not the obsidian blocks themselves.

If you cannot find obsidian, you may be looking in the wrong places. Obsidian forms only near lava, so search caves and ravines where lava pools are common. If you are in a newer world, try digging down to Y-level 0 to 64, where lava is more frequent. The water-and-lava method is always faster than mining if you do not have a diamond pickaxe yet.

If mobs keep spawning inside your frame before you light it, build the portal in a well-lit area or surround it with torches. Mobs cannot spawn on lit blocks, so a ring of torches around the frame will keep it safe while you gather materials.

Frequently Asked Questions

Can I build a Nether portal without a diamond pickaxe?

Yes. Use the water-and-lava method to create obsidian without mining it. Pour water on lava, and the hardened obsidian can be broken with any pickaxe. This is actually faster than waiting to find a diamond pickaxe.

What is the smallest Nether portal I can build?

The smallest working portal is 4 blocks wide and 5 blocks tall, using 10 obsidian blocks total. You cannot build it any smaller—the frame must meet these minimum dimensions to set up.

Do I need to build a new portal in the Nether?

No. When you enter a Nether portal from the Overworld, a matching portal automatically generates in the Nether. You can walk back through it to return home. You only need to build a new portal if the original one is destroyed.

Can I move a Nether portal to a different location?

You cannot move an existing portal, but you can build a new one anywhere. Break the obsidian frame of the old portal and build a new frame in your desired location. Light it, and you will have a portal at the new spot.

What do I do if I am stuck in the Nether?

Find the Nether portal that was generated when you arrived. It looks like an obsidian frame filled with purple blocks. Walk into it to return to the Overworld near your original portal. If the portal is destroyed, you will need to build a new obsidian frame and light it to escape.