PatchMyROM

BPS Patcher

BPS patches carry their own checksum, so a bad match gets caught before it corrupts anything. Drop your ROM and .bps file in below — it applies entirely on your device.

BPS

Modern, Pokemon-hack favorite

Why Hack Creators Reach for BPS

IPS never checked whether it was touching the right file. BPS was built specifically to fix that — it records a checksum for the source ROM and the finished result, so the patch itself can tell you when something doesn't line up. That's why it's become the go-to format for actively maintained ROM hacks that get updated often: creators would rather their patch fail loudly than silently hand someone a broken game.

Step-by-Step

1

Line up your base ROM

Check the hack's page for the exact game and revision it's built against. BPS will reject a mismatch rather than risk a broken patch.

2

Grab the .bps file

It's usually distributed as a single file next to the ROM hack's release notes.

3

Select both in the patcher

The format is read from the file header automatically — you don't need to tell it what it's looking at.

4

Apply and download

BPS verifies the output against its own recorded checksum before handing you the file, so a successful download means it's correct.

Patch a BPS file now

Mistakes That Trip Up BPS Patching

Ignoring the checksum-mismatch error

BPS rejects the wrong ROM on purpose — it's not a bug in the patcher. Track down the exact base ROM version the hack lists, not just "the same game."

Mixing up which file is the ROM and which is the patch

The dropzones don't care about labels the way a human would — check that your original game file went into the ROM slot before applying.

Expecting a BPS patch to work on a related but different game

BPS patches are built byte-for-byte against one source file. A patch made for one revision of a game won't apply to a different regional release.

Troubleshooting

"Invalid input ROM checksum" error

This is BPS doing its job — the ROM you selected doesn't match what the patch was built against. Re-check the region, revision, and that the file isn't already modified.

Learn more

Patch applies but the game won't boot

Rare with BPS since it checks both ends, but worth confirming the output extension matches what your emulator expects for that platform.

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Patch file itself won't load

Confirm the .bps file downloaded completely — a truncated download is the most common reason a patch file fails to parse at all.

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FAQ

BPS stores a checksum of both the ROM it expects and the ROM it should produce. IPS has neither, so BPS can catch a wrong-ROM mistake before it does any damage.
Yes. IPS is capped around 16MB by its offset size. BPS doesn't share that limit, which is part of why larger, newer ROM hacks tend to prefer it.
The checksum built into the patch didn't match your ROM. That almost always means a different region, revision, or a ROM that's already been altered.
BPS verifies its own output checksum as part of applying the patch, so a completed download has already passed that check — about as strong a guarantee as a patch format can give you.

Related Guides

ROM PatcherPatch a ROM file directly in your browser.Patch Formats ExplainedIPS vs UPS vs BPS vs xdelta — which one do you need?GBA ROM PatcherBPS is a common choice for larger, modern GBA ROM hacks.SNES ROM PatcherNewer SNES translation projects increasingly ship as BPS.

BPS checks its own work, but the patcher still runs entirely in your browser — nothing is uploaded either way.

Open the ROM Patcher

Not sure BPS is what you need? Compare it against IPS, UPS, and xdelta.

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