Canonical: https://rom-weaver.com/docs/convert-patch-format

# Convert BPS to IPS and other ROM patch formats

Convert a ROM patch to another format, such as BPS to IPS or IPS to BPS, with [Create a ROM patch](<https://rom-weaver.com/create-rom-patch>). You need the clean ROM the patch was made for. Files stay on your device.

<!-- START doctoc -->
## Table of contents

- [What do you need?](<#what-do-you-need>)
- [Convert the patch](<#convert-the-patch>)
- [Check the converted patch](<#check-the-converted-patch>)
- [Which format should you pick?](<#which-format-should-you-pick>)

<!-- END doctoc -->

## What do you need?

- The patch to convert, such as a `.bps`, `.ips`, `.ups`, or `.xdelta` file.
- The clean ROM that patch expects. A patch stores only changes, so Create rebuilds them from this ROM.

## Convert the patch

1. Open [Create a ROM patch](<https://rom-weaver.com/create-rom-patch>).
2. Add the clean ROM and the patch together. Create switches to **Patches & cheats** and shows the ROM as **Original**.
3. Open the patch card's **Checks**. Fix any [checksum mismatch](<https://rom-weaver.com/docs/fix-checksum-errors.md>) before you continue.
4. Choose the new format in **Patch format**.
5. Choose **Create patch & download**.

The format list follows file sizes. IPS stops at 16 MiB, BPS stops when the original and modified files together exceed 214,748,364 bytes (about 204.8 MiB), and disc images need xdelta or PPF. If Create reports a size limit, choose xdelta, or BPS for a cartridge ROM small enough to fit.

To merge several patches or add cheats, see [Build from patches and cheats](<https://rom-weaver.com/docs/create-rom-patches.md#build-from-patches-and-cheats>).

## Check the converted patch

1. In [Apply](<https://rom-weaver.com/apply-rom-patches>), apply the original patch to a fresh copy of the clean ROM.
2. Apply the new patch to another fresh copy.
3. Compare both results in [Checksum file](<https://rom-weaver.com/file-checksum>). The checksums should match.

## Which format should you pick?

[BPS vs IPS, UPS, xdelta and PPF](<https://rom-weaver.com/docs/patch-formats.md>) compares checksum protection and size limits. IPS cannot record which ROM it expects, so publish the clean ROM's checksum with an IPS patch.