Rompatcher

Free plan LinuxWindows

What Rompatcher is

Rompatcher is a free ROM patcher written in Rust for Linux and Windows. It applies patches and identifies their formats automatically from their magic bytes. Supported formats include IPS, BPS, UPS, APS N64, APS GBA, EBP, RUP, PPF, xdelta, and BDF, used with systems including Game Boy, NES, SNES, Game Boy Advance, Nintendo 64, PlayStation, and PSP. Optional checksum validation supports CRC32, Adler32, and MD5. Rompatcher can look up ROM hashes for more than 15 consoles through RetroAchievements. The project describes patch writes as transactional, using atomic writes and rollback if an error occurs. Without a specified output path, the command writes a file in a patched/ directory, using the ROM name with .patched and its extension. The README reports approximately 27 microseconds to patch a 1 MB ROM in IPS format. Installation is documented from source using Cargo. The listed license is MIT OR Apache-2.0, and the project page states no pricing or usage limits.

Who it suits

Rompatcher may suit Linux or Windows users working with ROM patches in its listed formats and systems. It is a command-line project with installation documented through Cargo.

What it does well

Automatically detects patch formats.
Optional checksums support CRC32, Adler32, and MD5.
Writes can roll back on error.
Free, with no usage limits stated.

What to know first

Installation instructions use Cargo to build from source.
Only Linux and Windows are listed.
No integrations beyond RetroAchievements are listed.

Plans

Plan	Billed and limits	Price
Rompatcher	No pricing or usage limits stated on the project page	Free

As github.com lists them, read 7 Oct 2026. The maker's own page has the final word.

Getting started

Visit the Rompatcher project page on GitHub.
Use the documented Cargo instructions to install it from source.
Run the command with a ROM and patch file.
Optionally enable checksum verification or provide an output path.

Verdict

Rompatcher covers a broad list of patch formats and includes optional checksums and write rollback. Its listed platforms are Linux and Windows, with source installation documented through Cargo.

Questions

Is Rompatcher free?

Yes. Its listed plan is free, and the project page states no pricing or usage limits.

Which operating systems does it support?

The listed platforms are Linux and Windows.

Which patch formats can it apply?

It lists IPS, BPS, UPS, APS N64, APS GBA, EBP, RUP, PPF, xdelta, and BDF.

Does Rompatcher verify checksums?

Checksum validation is optional and supports CRC32, Adler32, and MD5.

Does it have an integration?

The project names RetroAchievements for ROM hash lookups covering more than 15 consoles.

What license does it use?

The README lists the license as MIT OR Apache-2.0.

Facts from Rompatcher's own pages

Audience: The listed patch formats and example ROM extensions cover systems including Game Boy, NES, SNES, Game Boy Advance, Nintendo 64, PlayStation, and PSP. · github.com, 7 Oct 2026
Checksums: Optional checksum validation supports CRC32, Adler32, and MD5. · github.com, 7 Oct 2026
CLI output: When no output path is specified, the command creates a file under patched/ named from the ROM with .patched and its extension. · github.com, 7 Oct 2026
Format detection: The tool identifies patch formats from their magic bytes. · github.com, 7 Oct 2026
Installation: The README documents installation from source using Cargo. · github.com, 7 Oct 2026
Integrations: The README names RetroAchievements for ROM hash lookups; it lists no other integrations. · github.com, 7 Oct 2026
License: The README lists the project license as MIT OR Apache-2.0. · github.com, 7 Oct 2026
Patch formats: Supported formats listed are IPS, BPS, UPS, APS N64, APS GBA, EBP, RUP, PPF, xdelta, and BDF. · github.com, 7 Oct 2026
Performance: The README reports approximately 27 microseconds to patch a 1 MB ROM in IPS format. · github.com, 7 Oct 2026
Purpose: Rompatcher is a ROM patcher written in Rust that applies patches with automatic format detection and optional checksum verification. · github.com, 7 Oct 2026
RetroAchievements: It can look up ROM hashes for more than 15 consoles through RetroAchievements. · github.com, 7 Oct 2026
Security and compliance: The README describes checksum verification and write rollback but does not state a security certification or compliance standard. · github.com, 7 Oct 2026
Write safety: The project describes patch writes as transactional, with atomic writes and rollback on error. · github.com, 7 Oct 2026

Where Rompatcher stands on Freedom251

ROM Patching Software#13 of 20