How to Build a Nether Portal in Minecraft: A Complete Guide

Building a Nether portal is one of the most important milestones in any Minecraft survival playthrough. It opens access to an entirely different dimension — a hellish landscape filled with rare resources, dangerous mobs, and faster long-distance travel. Here's exactly how to do it, and what affects how that process plays out for different players.

What Is a Nether Portal?

A Nether portal is a constructed gateway that teleports players between the Overworld (the main dimension) and the Nether (a dangerous, lava-filled underworld dimension). Portals use a frame built from Obsidian and are activated with fire.

Once activated, stepping inside the glowing purple portal transports you to the Nether within a few seconds. A corresponding portal automatically generates on the Nether side.

What You Need to Build One

Materials Required

Obsidian is the key ingredient. It forms naturally where water flows over lava source blocks — specifically lava source blocks, not flowing lava. You'll need a Diamond or Netherite pickaxe to mine it; no other tool can collect Obsidian as a drop.

Flint and Steel is crafted from one iron ingot and one piece of flint (mined from gravel). Alternatively, a Fire Charge (craftable or found in Nether Fortress chests) can also ignite the portal.

Step-by-Step: Building the Portal Frame

Step 1 — Gather or Create Obsidian

If you can't find a natural Obsidian deposit, you can manufacture it:

1. Find or place lava source blocks in a contained area
2. Pour water directly over them using a bucket
3. The lava source blocks convert to Obsidian on contact
4. Mine with a Diamond pickaxe

This method lets you build a portal without ever finding a natural Obsidian vein — useful early in a world.

Step 2 — Build the Frame

The minimum portal frame is 4 blocks wide × 5 blocks tall (interior opening: 2 wide × 3 tall). The corners are optional — you only strictly need the sides and top/bottom.

Minimum layout (10 blocks):

• 2 columns of 3 Obsidian on each side
• 2 Obsidian across the bottom
• 2 Obsidian across the top

Full frame layout (14 blocks):

• Includes the 4 corner blocks for a cleaner, complete rectangle

You can also build larger portals — up to 23 × 23 interior — though the standard size is the most practical for survival play.

Step 3 — Ignite the Portal 🔥

With your frame built:

1. Equip your Flint and Steel (or Fire Charge)
2. Right-click (or use secondary action) on any Obsidian block inside the frame or on the ground within the frame
3. The interior fills with a swirling purple animation — the portal is now active

If the portal doesn't activate, double-check that your frame is fully connected with no gaps and that the interior dimensions meet the minimum size.

What Happens When You Enter

Stepping into an active portal triggers a loading transition. After approximately 4 seconds, you emerge in the Nether at a corresponding portal that generates automatically.

Nether coordinate scaling: The Nether operates on a 1:8 scale relative to the Overworld. Every block you travel in the Nether equals 8 blocks in the Overworld. This makes Nether travel useful for covering long Overworld distances quickly — a mechanic many experienced players use intentionally for fast travel networks.

Alternative Ways to Get Obsidian Early 🧱

Not everyone reaches Diamond tools at the same point in a playthrough. A few alternatives exist:

• Ruined Portals generate naturally in the Overworld and Nether. They're partially built Nether portal frames — sometimes requiring only a few extra Obsidian blocks to complete. These are one of the fastest ways to access the Nether early.
• Village chests, bastion remnant chests, and other loot sources occasionally contain Obsidian directly.
• Bartering with Piglins (post-Nether-entry) can yield Obsidian — though that requires already having Nether access.

Variables That Affect Your Approach

How you build your first portal depends heavily on where you are in the game:

• Early survival players often benefit most from locating a Ruined Portal rather than mining Obsidian from scratch, since Diamond tools may not be available yet
• Players with a Diamond pickaxe and bucket can manufacture Obsidian on demand almost anywhere
• Creative mode players have instant access to Obsidian in the inventory and can skip resource gathering entirely
• Speedrunners prioritize Ruined Portals specifically for this reason — they shave significant early-game time
• Players on Bedrock vs. Java Edition experience the same core portal mechanic, but minor differences in world generation and portal linking behavior can affect multi-portal travel networks

Portal linking behavior — which Overworld portal connects to which Nether portal — becomes a meaningful variable once you're building multiple portals. The game tries to match portals based on coordinate proximity using the 1:8 ratio, but the exact logic can produce unexpected connections in densely built worlds or specific terrain layouts.

Whether the standard approach or a Ruined Portal shortcut fits your current situation depends on where you are in your world, what tools you've already crafted, and what your immediate goals in the Nether actually are.