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DOS Wasm X
What it is
DOS Wasm X is a browser-based DOS emulator built around the DOSBox-X codebase and WebAssembly. It offers virtual hard drives in 512 MB, 1 GB, or 2 GB sizes and RAM options of 32 MB, 64 MB, or 128 MB. The browser stores the drive so users can return later, and the drive can be exported as an image for local saving. The emulator accepts ISO, ZIP, BIN, CUE, IMG, and 7z files; users can import and export files or change a CD while it is running. Controls include mobile mode, an on-screen keyboard, gamepad support, mouse capture, full screen, and zoom. CPU speed, emulator time, and mouse sensitivity can be adjusted, and audio, dark mode, and resolution resizing are listed. Windows 95 or Windows 98 can be installed using the user's own Windows copy and ISO. The project can be hosted on a web server by copying its dist folder or run in a container. The maker advises shutting Windows down inside the guest before leaving to save drive changes.
For and against
For
- Offers three virtual drive sizes and three RAM options.
- Supports gamepads and an on-screen keyboard.
- Can import and export files during emulation.
- Can be self-hosted or run in a container.
Against
- Windows installation requires the user's own copy and ISO.
- Leaving without shutting down Windows can risk unsaved drive changes.
- The virtual drive options top out at 2 GB.
The verdict
DOS Wasm X provides browser-based DOS emulation with configurable drive and memory options, file transfer, and several input controls. Remember to shut down Windows within the emulator before leaving, and provide your own Windows media if installing it.
Who it suits
It suits people who want to run DOS-compatible software in a browser, including on mobile. Users who want to install Windows 95 or 98 need their own copy and ISO.
Plans and prices
Free
Browser based DOS emulator · hard drive options: 512mb, 1 gig, or 2 gig · RAM options: 32mb, 64mb, or 128mb
Read 4 Oct 2026 · github.com
On the record
- Audio and display
- The README lists audio support, dark mode, and resolution resizing.github.com · read 4 Oct 2026
- Container deployment
- The README provides a Docker command to run the app in a container.github.com · read 4 Oct 2026
- Drive storage
- The in-browser hard drive has 512mb, 1 gig, or 2 gig options and can be exported as an image for local saving.github.com · read 4 Oct 2026
- Emulator controls
- Users can adjust CPU speed and emulator time, change mouse sensitivity, and pause or resume the emulator.github.com · read 4 Oct 2026
- File formats
- It lists automatic support for ISO, ZIP, BIN, CUE, IMG and 7z files.github.com · read 4 Oct 2026
- File transfer
- Users can import and export files into and out of the emulator and load or change a CD while it is running.github.com · read 4 Oct 2026
- Input and display
- Features include mobile mode, an on-screen keyboard, gamepad support, full screen, zoom controls and mouse capture.github.com · read 4 Oct 2026
- Input and mobile
- It supports mobile mode, an on-screen keyboard, gamepads, and mouse capture.github.com · read 4 Oct 2026
- Integrations
- The README identifies DOSBox-X as the core engine, DOSBox Pure for the on-screen keyboard, JS Dos for its Asyncify module, and Emscripten among the codebases used.github.com · read 4 Oct 2026
- Memory limit
- The listed RAM options are 32 MB, 64 MB and 128 MB.github.com · read 4 Oct 2026
- 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.github.com · read 4 Oct 2026
- Purpose
- DOS Wasm X is a browser-based DOS emulator built around ease of use and stability, based on the DosBox-X codebase.github.com · read 4 Oct 2026
- Security and affiliation
- The maker states that the app was made for fun and is not affiliated or associated with Microsoft.github.com · read 4 Oct 2026
- Security and compliance
- The opened maker pages do not state any security certifications or compliance claims.neilb.net · read 4 Oct 2026
- Self-hosting
- The project says users can host it on their own web server by copying the dist folder.github.com · read 4 Oct 2026
- 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.github.com · read 4 Oct 2026
- Storage behavior
- The README says the hard disk saves directly in the browser so users can return later and continue.github.com · read 4 Oct 2026
- Support
- The README points users to online documentation for more extensive guides and technical information.github.com · read 4 Oct 2026
