EM-DOSBox

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Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

EM-DOSBox is ranked #11 of 26 in MS-DOS emulators on Freedom251. 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

See all 20

Two bars DOS Browser Free tier No. 1Free6.7 Two bars DosKit Free tier No. 2Free6.7 Two bars DOSBox Free tier No. 3Free6.5 Two bars DOSBox Pure Free tier No. 4Free6.5 Two bars DOSBox Staging Free tier No. 5Free6.5 One bar js-dos Free tier No. 6Free6.5

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 Freedom251

Best MS-DOS Emulators in 2026#11 of 26

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Sources

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