Rom Patcher JS
Rom Patcher JS is a free browser-based tool for applying and creating patches for retro video game ROMs.
What Rom Patcher JS is
Rom Patcher JS is a free browser-based tool for applying and creating patches for retro video game ROMs. It supports IPS, UPS, APS, BPS, RUP, PPF, EBP, BSDiff, Paper Mario Star Rod, and VCDiff formats. Before patching, it displays a ROM’s CRC32, MD5, and SHA-1 checksums. The tool can automatically unzip files and remove ROM headers before patching. It runs in modern browsers, including mobile browsers, and can also run in Node.js for command-line patching and patch creation. The project can be customized and embedded in a website to provide an online patcher for that site’s patches. Its listed users include Romhacking.net, Smash Remix, Radical Red, and other sites. The product page identifies version 3.3.1 and requests optional donations to help cover increased infrastructure costs. The repository includes a LICENSE file, but its page does not state the license terms. The product page does not state a security certification or compliance standard for Rom Patcher JS.
Good
- Supports a range of patch formats, including IPS and BPS.
- Displays CRC32, MD5, and SHA-1 checksums.
- Can unzip files and remove ROM headers automatically.
- Offers Node.js command-line support.
Watch out
- The repository page does not state the license terms.
- The product page states no security certification or compliance standard.
Who it suits
It suits players and patch creators who need to apply or create ROM patches in a browser, including on mobile browsers. Developers can also run it in Node.js or embed a customized patcher on a website.
Verdict
Rom Patcher JS covers patch application and creation in browsers, with a Node.js option and checksum display. Review the license terms separately if they matter to your use.
The facts
Each one read from Rom Patcher JS's own pages, with the date it was checked.
Where it runs
- Browser support
- The project says it runs in any modern web browser, including mobile browsers.checked 4 Oct 2026
What it does
- Command line
- The project documents using it from Node.js to patch ROMs and create IPS patches.checked 4 Oct 2026
- Customization
- The project can be customized and embedded in a website to provide an online patcher for that site’s patches.checked 3 Oct 2026
- Developer use
- The project can be customized and embedded in a website to provide an online patcher for a site’s patches.checked 4 Oct 2026
- File handling
- It can automatically unzip files and remove ROM headers before patching.checked 3 Oct 2026
- Integrations
- The repository lists Romhacking.net, Smash Remix, Radical Red, and other sites as users of Rom Patcher JS.checked 4 Oct 2026
- Known users
- The project lists Romhacking.net, Smash Remix, Radical Red, and other sites as known users.checked 3 Oct 2026
- License
- The repository includes a LICENSE file, but the opened repository page does not state the license terms.checked 4 Oct 2026
- Other features
- It can remove headers before patching and automatically unzip files.checked 4 Oct 2026
- Patch creation
- It can create patches as well as apply them.checked 3 Oct 2026
- Patch formats
- Supported formats include IPS, UPS, APS, BPS, RUP, PPF, EBP, BSDiff, Paper Mario Star Rod MOD, and VCDiff.checked 4 Oct 2026
- Purpose
- Rom Patcher JS applies and creates patches for retro video game ROMs in a web browser.checked 4 Oct 2026
- ROM checksums
- The tool can show a ROM’s CRC32, MD5, and SHA-1 before patching.checked 4 Oct 2026
- Security
- The maker’s profile describes a separate file-integrity calculator as requiring no upload because processing happens in the browser; the product page does not state a security certification or compliance standard for Rom Patcher JS.checked 3 Oct 2026
- Support and donations
- The official app page asks for donations to help cover increased infrastructure costs.checked 4 Oct 2026
- Support and funding
- The product page requests optional donations to help cover increased infrastructure costs.checked 3 Oct 2026
- Version
- The official app page identifies the current displayed version as 3.3.1.checked 4 Oct 2026
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