Updated Oct 10, 2026 · 1 link from the Radiant Optimizer list
Diablo Web runs the original 1996 Diablo in a browser tab, and it is the friendliest port on the list for newcomers: you can start the free shareware demo immediately.
For the full game, load the DIABDAT.MPQ file from your own copy (for example the GOG release).
Listed in the post as Diablo.
The original 1996 Diablo in a browser tab. You can start the free shareware demo right away, or load DIABDAT.MPQ from your own copy for the full game.
Open project ↗Opens a third-party site. Skip anything that asks you to install a launcher or extension.
Diablo in browser is the friendliest port on the Radiant Optimizer list for newcomers. Diablo Web, a browser adaptation credited on its page to Nikita Maksimov, runs the original 1996 Diablo in a tab. You can start the shareware demo right away with no files, which gives you the first levels of the cathedral beneath Tristram.
For the full game, load the DIABDAT.MPQ file from your own copy. The port reads it locally and unlocks all sixteen dungeon levels and every class.
DIABDAT.MPQ is the main data archive of Diablo. It sits in the install folder of any PC copy. The easiest legitimate source today is the GOG release, which Blizzard put on sale in 2019 and which also includes the Hellfire expansion. Buy it, install it, and pick DIABDAT.MPQ from that folder when Diablo Web asks for it.
Characters and progress are stored in your browser. Clearing site data deletes them, so avoid private windows.
Blizzard North released Diablo at the end of 1996. Its randomized dungeons, loot and real-time combat defined the action RPG genre and led to Diablo II, Diablo III and Diablo IV. The dark, slow atmosphere of the original is still unique, and running it in a browser is one of the easiest ways to see where the series started.
The web port is part of a broader preservation effort: community projects have rebuilt the Diablo engine so the game runs on modern systems, and that work is what makes a browser version possible.
If you like this kind of preservation port, Hedgewars in browser is another fully legitimate option, and Half-Life in browser runs another 1990s classic with your own files. All 25 links are on the Radiant Optimizer games list.
The Warrior is the easiest start: high health, strong melee and the ability to use heavy armor. The Rogue fights from range with bows, which keeps dangerous monsters at a distance but needs careful positioning. The Sorcerer is the most powerful late in the game thanks to spells like Firebolt and Chain Lightning, but starts fragile and depends on mana. In the shareware demo all three let you explore the first dungeon levels, so it is a good way to choose before you load the full game.
Diablo II added more classes, open outdoor acts and a deeper item system, and later games moved to 3D and online play. The original stands apart: one town, one descending dungeon, and a slow, oppressive atmosphere. Diablo in browser is the easiest way to experience that first game today, and because the demo is free it costs nothing to try.
The shareware demo is free. The full game needs your own DIABDAT.MPQ.
In the install folder of a copy of Diablo you own.
The port is built for mouse and keyboard. Phones may load it but are awkward to play on.
The port is built around the base game data. Check the project page for expansion support.
Treat it as single-player. Browser ports of Diablo focus on the solo game.
No. The browser port runs offline-style single-player and never asks for a Blizzard account.
