EM-DOSBox

6.4easy start · #20of 26
in MS-DOS Emulators

Well documentedyes
Runs where you workno

Runs on Web.

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EM-DOSBox is ranked #20 of 26 in MS-DOS emulators on The Geeks Club. It runs on Web.

Compared on MS-DOS emulators

Free plan: Yes
Supported host platforms: Web
Disk image formats: ISO, CUE/BIN, CUE/IMG, floppy images, hard-drive images
Gamepad support: Yes
Audio CD support: Yes
Source available: Yes

Best EM-DOSBox alternatives

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DosKit Lesson 17.4 DOS Browser Lesson 27.3 Magic DosBox Lesson 37.2 DOS Wasm X Lesson 47.1 DOSBox Lesson 57.1 js-dos Lesson 67.1

The record

Purpose: EM-DOSBox is a DOSBox version that can be compiled with Emscripten to run old DOS games and other DOS programs in a web browser.
Status: The project says it runs most games successfully in web browsers, though some programs can encounter paging exceptions.
Build output: An Emscripten build produces dosbox.js, dosbox.wasm when WebAssembly is enabled, and a simple dosbox.html interface.
Asyncify: Asyncify is enabled by default to make more DOSBox features work, with what the project describes as a very small performance penalty.
Loading programs: The included packager tools can create web pages that load DOS files into the Emscripten file system and pass command-line arguments to DOSBox.
Configuration: A dosbox.conf file can be included in a package to change emulator speed, audio, or graphics settings.
Save-file limitation: Saved games go into an in-memory Emscripten file system by default and are lost when the web page is closed.
Build limitation: Building in Windows is unsupported because the build process requires a Unix-like environment and GNU Autotools.
Browser serving: The project says to serve the page through a web server because most browsers block access to other files from file:// URLs.
License: The repository says DOSBox is distributed under the GNU General Public License and includes a GPL version 2 license file.
Creator credit: The README credits Boris Gjenero with getting the Emscripten port working, fixing issues, and improving performance.
Compatibility: The project says most games run successfully in web browsers, though a few programs can have problems due to paging exceptions.
Browser features: With Asyncify enabled, users can interactively load files into DOSBox.
Packaging: The included packager tools can create web pages that load DOS files and launch a specified game or program.

Where it ranks on The Geeks Club

Best MS-DOS Emulators in 2026#20 of 26

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Sources

github.com/dreamlayers/em-dosbox· checked 4 Oct 2026