What a Nether Portal Does and What You Need

A Nether Portal is a doorway in Minecraft that takes you from the Overworld (where you start) to the Nether, a dangerous dimension filled with lava, hostile mobs, and valuable resources like ancient debris and netherite. Building one requires obsidian blocks — a material that only forms when water meets lava — and a way to light it on fire.

You do not need any special tools or mods. Every Minecraft version (Java Edition, Bedrock Edition, and Pocket Edition) includes portals as a core feature. The only real requirement is patience: gathering enough obsidian takes time, and the process is the same whether you are playing on a laptop, console, or phone.

Key Takeaways

  • A Nether Portal frame is made from 14 obsidian blocks arranged in a 4×5 rectangle (the corners are optional), and the inside must be empty space.
  • You create obsidian by pouring water over lava source blocks, which takes planning but requires no crafting table or special tools.
  • Once the frame is built, you light it by striking the inside with flint and steel or a fire charge — the portal ignites when ready.
  • Portals link between dimensions: stepping into one in the Overworld takes you to the Nether, and stepping into a Nether portal takes you back.

Gathering Obsidian: The Slowest Part

Obsidian forms only when flowing water touches a lava source block. The easiest place to find both is near the bottom of the world, around Y-level -59 to -64 (in newer versions) or Y-level 5 to 12 (in older versions). Dig down carefully with a diamond or netherite pickaxe — stone or iron will not break obsidian fast enough. A wooden pickaxe will break it but drop nothing.

Once you find lava, dig a small trench next to it and pour water into the trench so it flows over the lava. The lava will turn into obsidian. Repeat this until you have at least 14 blocks. You need 10 blocks minimum for the smallest legal portal (a 3×4 frame with corners), but 14 is safer because it gives you a full 4×5 rectangle with all corners filled.

If you cannot find lava easily, you can also find obsidian already formed in the world — it appears naturally in the Nether, in strongholds, and sometimes in caves. In Creative Mode, you can straightforward grab obsidian from the inventory without gathering anything.

Building the Frame in the Right Shape

Place your obsidian blocks in a rectangle that is 4 blocks wide and 5 blocks tall. The corners can be empty or filled — both work. The inside of the rectangle must be completely empty (a 2×3 space). Think of it like a picture frame: the obsidian is the border, and the empty space is where the purple swirling portal will appear.

The frame does not have to be perfectly level with the ground. You can build it on a hillside, inside a building, or even floating in the air — as long as the shape is correct, it will work. The frame also does not have to face any particular direction.

If you make a mistake and place obsidian in the wrong spot, you will need to break it with a diamond or netherite pickaxe and move it. This is why gathering extra obsidian is worth the time.

Lighting the Portal with Flint and Steel

Once your frame is built, you need to set the inside on fire. The easiest way is to craft flint and steel: combine one flint (found by breaking gravel) and one iron ingot (smelted from iron ore) on a crafting table. Right-click or tap the inside of the portal frame with the flint and steel, and the portal ignites when ready with purple swirling blocks.

If you do not have flint and steel, a fire charge works the same way. Fire charges are rarer but can be found in the Nether or crafted from blaze powder, charcoal, and gunpowder. You can also use a regular fire block if you have one, though this is less common.

Once lit, the portal stays active forever — you do not have to relight it. If you break the obsidian frame, the portal closes, but you can rebuild it in the same spot and light it again.

Stepping Through and Finding Your Way Back

Walk into the purple portal. After a few seconds of loading, you will appear in the Nether. The Nether is much more dangerous than the Overworld — there are fire, lava lakes, and hostile mobs everywhere. Bring armor, a sword, and food before you go in.

To return, find or build another Nether Portal in the Nether dimension and step through it. You will reappear in the Overworld, usually near where you left (though the exact location depends on the coordinate math between dimensions). If you cannot find a portal in the Nether, you can build a new one using obsidian you find there, light it, and step through.

Linking Portals Between Dimensions

Minecraft automatically links portals between the Overworld and Nether using coordinates. If you build a portal at coordinates X=100, Z=100 in the Overworld, stepping through takes you to roughly X=12.5, Z=12.5 in the Nether (the Nether is 8 times smaller, so coordinates are divided by 8). If you build a portal at those Nether coordinates and step through, you return to the Overworld portal.

This means you can use portals as fast travel. Build a portal in the Overworld, note its coordinates, travel to the Nether, and build a second portal at the divided coordinates. Stepping between them covers huge distances in the Overworld without walking.

If you want two separate portals in the Overworld to lead to different places in the Nether, you have to build them far enough apart that the Nether portals do not link to each other. The exact distance depends on your world, but spacing Overworld portals at least 1,000 blocks apart usually works.

Troubleshooting Common Portal Problems

If you light the frame and nothing happens, check that the inside is completely empty — even a single block of dirt or grass will block the portal. Also check that your frame is exactly the right shape: 4 wide and 5 tall, with the inside clear. If the shape is wrong, the portal will not form.

If the portal closes when you step through, you probably broke the frame by accident. Rebuild it and light it again. If you are stuck in the Nether with no portal, you can build a new one using obsidian you find there or mine from lava. You can also use the /kill command (if cheats are on) to respawn at your spawn point, though you will lose your items.

If you built a portal but it is linking to the wrong place, check your coordinates. Portals link based on math, not on where you want them to go. If the link is inconvenient, build your Nether portal further away from the calculated spot.

Frequently Asked Questions

Can I build a Nether Portal without a crafting table?

You need flint and steel to light the portal, which requires a crafting table. However, you can craft it anywhere once you have the materials. You do not need a crafting table to gather obsidian or build the frame itself.

What happens if I break the obsidian frame after I light it?

The portal closes when ready. You can rebuild the frame in the same spot and light it again. Breaking the frame does not destroy the portal permanently — it just deactivates it until you rebuild.

Do I need to build a portal in the Nether to get back?

No. If there is a Nether Portal in the Nether at the coordinates linked to your Overworld portal, stepping through it takes you back. If there is not one, you can build a new one using obsidian you find in the Nether, or you can use commands to teleport back if cheats are on.

Can I move a Nether Portal to a different location?

You can break the obsidian frame and rebuild it somewhere else, but the new portal will link to different Nether coordinates based on the math. If you want a portal at a specific location, you have to build it at the right Overworld coordinates so it links correctly.

What is the smallest Nether Portal I can build?

The smallest legal frame is 3 blocks wide and 4 blocks tall (10 obsidian blocks minimum, with corners empty). A 4×5 frame with all corners filled uses 14 blocks and is more forgiving if you make small mistakes.