DOS Wasm X is a browser-based DOS emulator built with WebAssembly and the DOSBox-X codebase. It runs DOS-compatible software and supports installing Windows 95 or Windows 98 if you provide your own Windows copy and ISO. Choose a virtual drive size of 512 MB, 1 GB, or 2 GB, with RAM options of 32 MB, 64 MB, or 128 MB. The drive saves in the browser so you can return later, and it can be exported as an image for local storage. The emulator handles ISO, ZIP, BIN, CUE, IMG, and 7z files, and supports file transfers and changing a CD while running. Controls include mobile mode, an on-screen keyboard, gamepads, mouse capture, full screen, zoom, and settings for CPU speed, emulator time, and mouse sensitivity. Audio, dark mode, and resolution resizing are also listed. The project can be hosted by copying its dist folder to a web server or run in a container. Shut down Windows inside the emulator before leaving to save drive changes.

Who it is for

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

What is good

Virtual drive changes can persist in the browser.
Exports the virtual drive as an image.
Supports six listed disk image and archive formats.
Offers mobile mode, on-screen keyboard, and gamepad support.
Can be self-hosted or run in a container.

What to know first

Windows installation requires your own copy and ISO.
Leaving Windows running can risk unsaved drive changes.
No security certifications or compliance claims are stated.

Verdict

DOS Wasm X combines browser-based DOS emulation with configurable drive, memory, and input options. Remember to shut down Windows inside the emulator before leaving, and supply your own Windows copy and ISO if installing it.

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

Best DOS Wasm X alternatives

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DosKit Lesson 17.4 DOS Browser Lesson 27.3 Magic DosBox Lesson 37.2 DOSBox Lesson 57.1 js-dos Lesson 67.1 MS-DOS Player Lesson 77.1

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