ImageForge

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A tool for Android boot images that runs in your browser. Patch one with Magisk, KernelSU, APatch or a fork of any of them; open an OTA package and take a partition out of it; browse what is inside a super or erofs or ext4 image; compare two images; edit the boot logo or the boot animation; and see what a file actually is before you touch it.

There is no server, no account and no telemetry. The parsers, the patchers and the codecs run in a Web Worker inside the page, with WebAssembly for the parts that need it or that are upstream C compiled as it is. Nothing is uploaded, and nothing is flashed: a run ends at a file you download.

Repository: https://github.com/LyraVoid/ImageForge

The tools

Tool	What it is for	State
Patch an image	Analyse a boot image, pick a patch method, plan the patch, run it in the worker, verify the result and download it. Five managers of the KernelSU family, three KernelPatch core images and three Magisk-family managers are supported	available
Extract from a package	Open an OTA payload.bin or a vendor archive (an 8 GB package is read in ranges, never loaded whole) and pull out boot, init_boot, vendor_boot or any other entry	available
Unpack partitions	Open a super image and its logical partitions, a sparse image, erofs or ext4; browse in ranges, read a file out of it, and write sparse and super images back out	available
Boot logo	Read a splash image (OPPO/Realme/OnePlus) or a MediaTek logo image, look at the pictures in it, and replace one	available
Boot animation	Open a bootanimation.zip, play it, replace frames, edit desc.txt and pack it again	available
Compare images	Diff two files and see which section of a boot image each difference falls in	available
Inspect	Read-only: what a file is, what it holds, what already patched it	available

Which managers it can patch for

A patch only works with the manager app that trusts it, because each rebuild of the payloads is compiled against its own signing certificate. That is why this is a choice rather than a fixed list: the plan records the manager, and the result page links to the release page of its app.

Family	Managers	The image needs
KernelPatch (kernel patch)	APatch, Aster, FolkPatch	me.bmax.apatch, me.yuki.aster or me.yuki.folk
KernelSU (ramdisk + module)	KernelSU, SukiSU, ReSukiSU, YukiSU, KowSU	the matching app, for example me.weishu.kernelsu
Magisk (ramdisk)	Magisk, WeaveMask, MagisKube	com.topjohnwu.magisk, io.github.seyud.weave or org.magiskube.magisk

Why you can trust what comes out

Every byte-level format here was implemented against a reference, not against recollection, and the claims the project makes are the ones its tests can check:

• The ramdisk a patch produces is byte for byte the one the official app writes — Magisk's own output for the same source image, and KernelSU's. The reference liblz4 and bzip2 are compiled to WebAssembly rather than reimplemented, and a device ramdisk re-encodes to the bytes the stock image shipped.
• The KernelPatch core images reproduce what their own releases produce, checked against each branch's native kptools binary with the browser build, byte for byte.
• Sparse and super images are compared with AOSP's img2simg, lpmake, lpdump and lpunpack, and the erofs and ext4 readers against sha256sum output taken on a device.
• Every bundled binary is digest verified before it is used, registered with a pinned upstream revision and its licence record, and held to what it claims to be — a module is a relocatable ELF whose vermagic matches the device KMI, a core image starts with KP1158, a stub is an APK.
• Nothing is verified against this project's own output. When a reference exists it is read and cited, or compiled and run, or used as an oracle. docs/architecture.md explains the order and lists the bugs each one found.

Where a byte-level contract exists but real material to check it does not, the record says so instead of implying more: each manager's licence record in THIRD_PARTY_LICENSES/ ends with what has not been verified yet.

Getting it

git clone https://github.com/LyraVoid/ImageForge && cd ImageForge
pnpm install
pnpm dev          # development server on http://127.0.0.1:5173/
pnpm build        # tsc -b && vite build, a static site in dist/
pnpm preview      # serve the production build
pnpm verify       # docs check, typecheck, lint, tests, build — the gate

Requirements: Node 22.13+ and pnpm 11 (the exact pnpm is pinned in package.json as packageManager, so corepack enable or a recent pnpm picks it up). Rebuilding the Rust module needs a Rust toolchain with the wasm32-unknown-unknown target; the other WebAssembly modules are built by scripts/ from pinned upstream releases. All compiled modules are committed, so neither toolchain is needed just to run or develop the app.

It is a static site, and the paths inside it are absolute — the service worker, the manifest and the WebAssembly modules are fetched from /, /wasm and /artifacts — so serve dist/ from the root of a domain rather than a subdirectory. After the first visit the app works offline.

Deploying it

It is a static site, so any host that serves files will do. Four things are worth checking before you point a domain at it:

• Build it with pnpm build (that is tsc -b && vite build, output in dist/) and publish dist/. The build needs Node 22.13+; if your host only offers an older one, build locally and upload the contents of dist/ instead.
• Serve it from the root of a domain, not a subdirectory: the service worker, the manifest and the WebAssembly modules are fetched from /, /wasm and /artifacts.
• Turn on the single-page fallback: every unknown path has to return index.html, otherwise a deep link like /tools/patch/plan gives a 404 on a first visit (after one visit the service worker serves the cached shell itself). On Netlify or Cloudflare Pages that is a public/_redirects with /* /index.html 200; on Vercel a vercel.json rewrite; on nginx try_files $uri /index.html.
• Use HTTPS. A few browser APIs — WebCrypto among them — only exist in a secure context. Without it the app still works (hashing falls back to a JavaScript implementation, a few times slower) but the service worker does not register, so there is no offline mode.

Make sure your host serves the .wasm files at all: a rule that blocks unknown extensions stops the patch pipeline before it starts, and the settings page will say so.

What it can read

Format	What it does here
Boot image header v0–v4	parse, extract, repack, verify; boot, init_boot and vendor_boot
Kernel containers	uncompressed, gzip, LZ4 (frame or legacy, dependent blocks included), xz
Ramdisk	CPIO newc/crc, gzip/LZ4/xz containers, produced the way magiskboot writes them
super images	liblp metadata, logical partitions and their extents; built the way lpmake does
Sparse images	AOSP chunk types, whole-file or streamed; built the way img2simg does
erofs	superblock, inodes, LZ4-compressed files, in ranges
ext4	superblock, extent trees, directories, in ranges
Zip and OTA packages	zip64, an 8 GB payload.bin read in ranges, REPLACE, REPLACE_XZ and REPLACE_BZ
Splash and MediaTek logo images	parse, decode the frames, replace one, repack
Boot animations	desc.txt (vendor dialects included) and the part directories, repacked as a stored zip

Anything a reader does not understand it refuses with an error of its own, and damaged input is part of the test suite rather than an afterthought.

Before you flash anything

ImageForge never touches a device: it hands you a file, and what you do with it is yours. Writing a patched image to the wrong partition, or one built for a different device or kernel, can leave a phone unable to boot. Keep a stock copy of every partition you patch, know how to restore it with fastboot, and read the checklist on the result page — it names the partition, the manager app the image needs, and the fact that the AVB signature is gone. docs/usage.md is the user guide.

Limits, on purpose

• A KernelPatch core image can also be supplied by hand, and a KernelSU or Magisk module supplied by the user overrides the bundled one. Both are checked before use — the core image for the KernelPatch magic, the module by its .modinfo and the kernel it was built for.
• The AVB signature is dropped on repack, so verified boot fails unless the image is re-signed or verification is disabled.
• Remote artifact downloads are not implemented: only artifacts bundled with the build (digest verified) can be resolved, which is what keeps the tool usable offline and auditable.
• No writer for erofs or ext4, and no KernelPatch LKM route. Each would need a device to be verified against, so neither is pretended.

Project

src/core/      image engine, patch engine, artifact registry, compatibility, errors
src/workers/   worker protocol and session
src/wasm/      module loader, TypeScript fallback, WASI runner, digest registry
src/routes/    the pages; src/components/ the design system; src/i18n/ four languages
crates/        the Rust crate compiled to WebAssembly
scripts/       reproducible builds, the icon generator, the material table, the payload scanner
public/        bundled WebAssembly modules, manager payloads, icons, service worker
tests/         unit, integration, worker, wasm and interface tests
docs/          architecture, testing material, user guide
THIRD_PARTY_LICENSES/  upstream licences, digests and integration policy

pnpm verify is the gate; docs/testing.md lists the material the strongest tests need, where each one looks, and the environment variable that supplies it. Tests that need material skip themselves and say so, so the suite is honest about what did not run. CONTRIBUTING.md has the rules that matter, including how to add a manager, and SECURITY.md says how to report something sensitive.

License

ImageForge is licensed under AGPL-3.0-or-later: see LICENSE and NOTICE. If you run a modified version as a network service, the AGPL asks you to offer its source to the people using it.

Third-party code keeps its own licence and is never re-licensed. Every bundled binary is registered with its upstream revision, licence text and digest in THIRD_PARTY_LICENSES/. The projects whose releases are bundled are named for provenance only: ImageForge is an independent project and is not affiliated with, endorsed by or sponsored by Magisk, KernelSU, APatch, KernelPatch or any of the managers listed in NOTICE.