DOS Wasm X is a free DOS emulator that runs in a browser using WebAssembly and the DOSBox-X codebase. It supports DOS-compatible software, and users can install Windows 95 or Windows 98 if they supply their own copy and ISO. A browser-stored hard drive is available in 512 MB, 1 GB, or 2 GB sizes, with 32 MB, 64 MB, or 128 MB of RAM. Users can export the drive as an image, import and export files, and load or change a CD while the emulator is running. Supported file formats include ISO, ZIP, BIN, CUE, IMG, and 7z. Controls include an on-screen keyboard, gamepad support, mobile mode, full screen, zoom, mouse capture, and settings for CPU speed, emulator time, and mouse sensitivity. Audio, dark mode, and resolution resizing are also listed. The project can be hosted on a web server by copying its dist folder or run in a container. Before leaving after using Windows, shut it down inside the guest system to save drive changes.

Who it is for

It suits people who want to run DOS-compatible software in a browser, including on mobile, or install Windows 95 or 98 using their own copy and ISO. It may also suit users who want to host the emulator themselves.

What is good

Free browser-based emulator using WebAssembly.
Hard drive can be saved in the browser or exported.
Supports ISO, ZIP, BIN, CUE, IMG, and 7z.
Offers gamepad support and mobile mode.
Can be hosted on a web server or run in a container.

What to know first

Windows installation requires your own Windows copy and ISO.
The browser hard drive has size options up to 2 GB.
Shutting down Windows before leaving is advised to save changes.

Verdict

DOS Wasm X combines browser-based DOS emulation with several storage sizes, input options, and file formats. Keep in mind the Windows installation requirement and shut down Windows in the emulator before leaving.

DOS Wasm X plans and pricing

All plans

Free Free Browser based DOS emulator · hard drive options: 512mb, 1 gig, or 2 gig · RAM options: 32mb, 64mb, or 128mb github.com · 4 Oct 2026

Compared on MS-DOS emulators

Free plan: Yes
Supported host platforms: Web, mobile
DOS target versions: dos-compatible
Disk image formats: ISO, ZIP, BIN, CUE, IMG, 7z
Gamepad support: Yes
Source available: Yes

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The record

Purpose

DOS Wasm X is a browser-based DOS emulator built around ease of use and stability, based on the DosBox-X codebase.

Windows support

It supports installing Windows 95 or Windows 98 using the user's own copy of Windows.

File formats

It lists automatic support for ISO, ZIP, BIN, CUE, IMG and 7z files.

Storage

The browser hard drive has 512 MB, 1 GB or 2 GB size options and can be exported as an image for local saving.

Memory limit

The listed RAM options are 32 MB, 64 MB and 128 MB.

Input and display

Features include mobile mode, an on-screen keyboard, gamepad support, full screen, zoom controls and mouse capture.

Emulator controls

Users can adjust CPU speed and emulator time, change mouse sensitivity, and pause or resume the emulator.

File transfer

Users can import and export files into and out of the emulator and load or change a CD while it is running.

Self-hosting

The project says users can host it on their own web server by copying the dist folder.

Container deployment

The README provides a Docker command to run the app in a container.

Storage behavior

The README says the hard disk saves directly in the browser so users can return later and continue.

Security and compliance

The opened maker pages do not state any security certifications or compliance claims.

Support

The README points users to online documentation for more extensive guides and technical information.

Notable usage note

The app advises shutting down Windows in the guest OS before leaving the page to save hard drive changes and prevent Scandisk from running at the next boot.

Price from

Free