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Emulator & Retro Tools

GameCube GCI to GCS Lossless Converter

Convert a canonical GameCube GCI single-save container to canonical GCS while preserving the exact directory entry and save payload, with strict target reopen and byte-identical rollback proof.

GameCube

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.

GameCube GCI to GCS Lossless Converter
BROWSER LOCAL

Checking whether the declared runtime module is loaded. No input has been processed.

Session change summary

No output has been built in this session.

What this Tool does

Convert a canonical GameCube GCI single-save container to canonical GCS while preserving the exact directory entry and save payload, with strict target reopen and byte-identical rollback proof.

Verification boundary

Source must pass the existing strict GameCube parser as GCI and be byte-identical to the canonical GCI writer representation. Permanent 16 MiB ceiling. Canonical single-save representations only. Non-canonical wrapper metadata is refused instead of discarded. No memory-card filesystem editing, repair, payload editing or signing is performed.

Output and rollback

Canonical GCS output, byte-identical source rollback reconstruction, and deterministic SHA-256-bound proof JSON. The original selected source is never modified in place.

Before you convert

Keep an independent backup, use the exact representation named by this Tool, and test the resulting copy in the intended emulator or utility before replacing any working save.

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

.gci

Platforms

GameCube

Supported versions / editions

Only the existing verified Dolphin-compatible GCI/GCS/Datel SAV single-save framing. No memory-card image or game-specific payload transformation.

Input constraints

Source must pass the existing strict GameCube parser as GCI and be byte-identical to the canonical GCI writer representation. Permanent 16 MiB ceiling.

Known limitations

Canonical single-save representations only. Non-canonical wrapper metadata is refused instead of discarded. No memory-card filesystem editing, repair, payload editing or signing is performed.

Output / result

Canonical GCS output, byte-identical source rollback reconstruction, and deterministic SHA-256-bound proof JSON.

03 / Instructions

Use a reversible workflow.

File-oriented workflows start with an untouched original. Tool-specific instructions add only details documented for this utility.

  1. 01Keep the original

    Preserve an untouched copy before creating or transforming binary output.

  2. 02Confirm scope

    Match the file size, format, platform, and version to the support information on this page.

  3. 03Process locally

    Use the runtime only when the page reports that its declared engine is loaded.

  4. 04Validate output

    Compare or test the result before replacing any working source file.

Tool-specific steps

Choose the local source. SaveEditor applies only the named existing verified conversion rule and enables output after its strict source, target/scope and rollback predicates pass.

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

All Phase 72 operations run only on explicitly selected local files in the browser under the permanent 16 MiB per-file ceiling. No fetch, XMLHttpRequest, WebSocket, sendBeacon, account login, cloud synchronization or remote conversion service is used.

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.

Wrong file or size

Re-check the documented input type and browser size limit before retrying.

Unsupported format

A generic converter does not imply support for every game-specific container, signing scheme, or serialization format.

Source was modified

Return to the untouched source instead of repeatedly processing a damaged or partially transformed file.

Known Tool issues

A refusal means the existing verified parser/layout/writer or a Phase 72 round-trip predicate failed. Renaming an extension, matching a size, or supplying a template cannot bypass strict source/target checks.

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 verified2026-08-11
Profilegamecube-gci-to-gcs-lossless-converter

Method notes

Verified as a narrow surface over existing conversion authority with deterministic SHA-256 evidence, source immutability, strict target reopen or exact-slice proof, byte-identical rollback where applicable, malformed-input refusal, independent reference vectors and source/installable parity.

Public references

  1. https://github.com/dolphin-emu/dolphin/blob/master/Source/Core/Core/HW/GCMemcard/GCMemcardUtils.cpp
  2. https://github.com/dolphin-emu/dolphin/blob/master/Source/Core/DolphinQt/GCMemcardManager.cpp

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 GameCube GCI to GCS Lossless 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.

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Only index-ready verified records from the same Tool Family are shown here.

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