RetroArch is a frontend and its cores expose different save-memory layouts. Phase 36 therefore names the supported core and exact structure instead of advertising a universal RetroArch converter. The Mupen64Plus-Next layout is deterministic enough to split safely into its declared regions and rebuild after one exact-size replacement without interpreting any game data.
Emulator & Retro Tools
RetroArch Save Converter
Split and rebuild the exact Mupen64Plus-Next RetroArch 290 KiB composite battery-save layout using fixed EEPROM, four Controller Pak, SRAM, and FlashRAM regions.
01 / Tool workbench
Use the runtime only when it is actually ready.
The application shell fails closed. An input interface is not enabled merely because a WordPress Tool record exists; the declared engine must be registered in the current build.
Session change summary
No output has been built in this session.
02 / Compatibility
Know the supported input before opening a file.
Compatibility fields are intentionally explicit. Missing values stay unclaimed rather than being filled with generic assumptions.
Accepted extensions
.srm
Platforms
Nintendo 64 / RetroArch
Supported versions / editions
Only the Mupen64Plus-Next RetroArch/libretro composite save-memory structure described by the referenced core source. This is not a generic rule for every RetroArch core or every .srm file.
Input constraints
Input must be exactly 0x48800 bytes (296,960 bytes). Region offsets and sizes are fixed by the Mupen64Plus-Next libretro save_memory_data structure: 0x800 EEPROM, four 0x8000 mempaks, 0x8000 SRAM, and 0x20000 FlashRAM.
Known limitations
The converter does not inspect RetroArch save states, infer which region a game actively uses, change N64 byte order, resize regions, merge arbitrary core formats, or promise compatibility for another libretro core that also uses .srm.
Output / result
Individual exact region files, or a new 0x48800-byte composite in which one explicitly selected fixed-size region has been replaced. All bytes outside that region remain unchanged.
03 / Instructions
Use a reversible workflow.
File-oriented workflows start with an untouched original. Tool-specific instructions add only details documented for this utility.
- 01Keep the original
Preserve an untouched copy before creating or transforming binary output.
- 02Confirm scope
Match the file size, format, platform, and version to the support information on this page.
- 03Process locally
Use the runtime only when the page reports that its declared engine is loaded.
- 04Validate output
Compare or test the result before replacing any working source file.
Tool-specific steps
Choose a known Mupen64Plus-Next RetroArch .srm. Split it to inspect/download fixed regions, or choose one region and an exact-size replacement to build a new composite. Preserve the original composite until the rebuilt file is tested.
04 / Privacy and processing
The processing mode is part of the product contract.
SaveEditor.com should state local processing only when the implementation truly keeps file contents in the browser. Server or hybrid processing must be disclosed just as clearly.
Declared mode
Browser local
Runtime state
Operational
Tool-specific privacy notes
Phase 36 reads a selected file only after explicit local file selection. Parsing, inspection, normalization, extraction, and supported conversions run in the browser. The emulator-retro runtime contains no fetch, XMLHttpRequest, WebSocket, or sendBeacon calls. The shared file ceiling is 16 MiB, with stricter format-specific limits where appropriate.
05 / Troubleshooting
When a file is rejected, do not force it.
A rejection can indicate an unsupported size, format, version, platform, or byte sequence. Preserve the original and correct the input instead of bypassing validation.
Re-check the documented input type and browser size limit before retrying.
A generic converter does not imply support for every game-specific container, signing scheme, or serialization format.
Return to the untouched source instead of repeatedly processing a damaged or partially transformed file.
Known Tool issues
Wrong-size composites and wrong-size region replacements fail closed. A generic .srm from another system/core must not be forced through this tool merely because the extension matches.
06 / Verification
Support claims should be traceable.
The verification date, method notes, and public references are kept separate from marketing language so compatibility can be reviewed over time.
Last verified2026-08-08
Profileretroarch-save-converter
Method notes
Verified against Mupen64Plus-Next libretro memory-structure declarations and region-size constants, with deterministic offset/split/replacement fixtures, exact-size rejection, and source-immutability checks.
Public references
- https://github.com/libretro/mupen64plus-libretro-nx/blob/master/custom/mupen64plus-core/src/api/libretro_memory.h
- https://github.com/libretro/mupen64plus-libretro-nx/blob/master/custom/mupen64plus-core/src/device/controllers/paks/mempak.h
- https://github.com/libretro/mupen64plus-libretro-nx/blob/master/custom/mupen64plus-core/src/device/cart/sram.h
- https://github.com/libretro/mupen64plus-libretro-nx/blob/master/custom/mupen64plus-core/src/device/cart/flashram.h
07 / FAQ
Questions to answer before editing.
These answers are generated from the Tool record and current runtime state rather than generic compatibility promises.
Is RetroArch Save Converter ready to use?
The Tool record is verified and declares an operational runtime. The page enables its input controls only when the declared engine module is loaded in the current build.
Does processing stay in the browser?
Yes for this declared mode. The loaded runtime processes the explicit input in the browser; Tool-specific privacy notes describe the exact scope and limits.
Should I keep the original file?
Yes. Keep an untouched source file until any generated output has been validated.
What if my input is rejected?
Use the validation message to correct the base, encoding, width, timezone, byte alignment, or size. The runtime does not guess through invalid input.
Related tools
Continue with the same tool family.
Only index-ready verified records from the same Tool Family are shown here.
Related guides
Read the guidance connected to this tool.
Only reviewed, index-ready Guides that explicitly reference this Tool are included.
Beginner
Backups & Safety
Nintendo 64 Controller Pak Backup & Identification Guide
A safety-first Nintendo 64 Controller Pak guide for identifying the intended representation, preserving an untouched source copy, and choosing only a verified compatible Tool.
Beginner
Save File Formats
Nintendo 64 Controller Pak Integrity & Troubleshooting Guide
A fail-closed Nintendo 64 Controller Pak troubleshooting guide for distinguishing representation problems from unsupported semantics and for selecting read-only integrity checks before any repair attempt.
Beginner
Backups & Safety
RetroArch Mupen64Plus-Next SRM Backup & Identification Guide
A safety-first RetroArch Mupen64Plus-Next SRM guide for identifying the intended representation, preserving an untouched source copy, and choosing only a verified compatible Tool.