Dlssync
Open-source DLSS updater for Windows. Keeps DLSS, FSR and XeSS DLLs in sync with NVIDIA, AMD, Intel and Microsoft upstream releases. Hash-verified, vendor-signed, fully reversible.
What is DLSSync · Features · Security · Download · FAQ · License
What is DLSSync
DLSSync detects every game installed via Steam, Epic Games, GOG Galaxy, Ubisoft Connect, EA Desktop, Xbox / Microsoft Store and Battle.net. It then keeps the following DLL families synchronized with each vendor's latest publisher release.
| Vendor | Family | DLLs |
|---|---|---|
 NVIDIA |
DLSS Super Resolution | nvngx_dlss.dll |
| DLSS Frame Generation | nvngx_dlssg.dll, sl.dlss_g.dll | |
| DLSS Ray Reconstruction | nvngx_dlssd.dll, sl.dlss_d.dll | |
| NVIDIA Streamline | sl.interposer.dll, sl.common.dll, sl.pcl.dll, sl.nis.dll | |
| NVIDIA Reflex | sl.reflex.dll | |
 Intel |
XeSS Super Resolution | libxess.dll, libxess_dx11.dll |
| XeSS Frame Generation | libxess_fg.dll | |
| XeLL | libxell.dll | |
 AMD |
FidelityFX Super Resolution | amd_fidelityfx_*.dll, ffx_fsr3upscaler_x64.dll |
| FSR Frame Generation | ffx_frameinterpolation_x64.dll | |
 Microsoft |
DirectStorage | dstorage.dll, dstoragecore.dll |
Replacements pass two independent signature checks. A SHA-256 mismatch or an Authenticode publisher mismatch refuses the write. Every replaced DLL goes into a local SQLite snapshot store, so any change reverts in one click.
Features
Hash-verified DLLsEvery DLL is SHA-256 checked against the public CDN-hosted catalog before it lands in your game folder. |
Authenticode publisher gateThe signer subject is verified against the known NVIDIA, AMD, Intel and Microsoft publisher certificates. The app never re-signs or repackages. |
One-click rollbackEvery replaced DLL goes into a local SQLite snapshot store. The Backups tab restores any snapshot in a single click. |
Ed25519-signed auto-updateThe app checks GitHub Releases on a 6 hour cadence. The bottom-left banner downloads, verifies and restarts. Tampered payloads are rejected. |
Under 100 MB idle RAMClose-to-tray plus Windows EcoQoS Efficiency Mode drops idle CPU to about 0 percent. Task Manager shows the green leaf badge. |
Zero telemetryNo analytics, no accounts, no phone-home. The only outbound traffic is the GitHub Releases endpoint, the jsDelivr DLL catalog and Steam's public cover-art CDN. |
Per-user install, no adminNSIS installer incurrentUser mode. Installs to %LOCALAPPDATA%\DLSSync\. No UAC prompt, no driver, no kernel hook.
|
Every Windows launcherSteam, Epic, GOG, Ubisoft, EA, Xbox, Battle.net, plus arbitrary custom folders for portable installs. |
Security
The app gates every DLL replacement behind two independent signature checks.
| Layer | Mechanism | Refuses |
|---|---|---|
| Update payload | Ed25519 signature over the NSIS bundle | An update whose signature does not verify against the embedded public key |
| DLL replacement | SHA-256 plus Authenticode publisher subject match against the catalog | A DLL not signed by NVIDIA, AMD, Intel or Microsoft |
| Rollback | Local SQLite snapshot of every replaced file before the write | Nothing. Restore is offline and instant |
The application has no driver, no kernel-mode hook, no in-process injection. It reads and writes DLL files inside the game's own install directory. The outbound network surface is the GitHub Releases endpoint, the public jsDelivr DLL catalog and Steam's public cover-art CDN. Every call is unauthenticated and visible from Settings > Detection.
Download
The installer is a per-user NSIS bundle. It installs to %LOCALAPPDATA%\DLSSync\ without an admin prompt and registers an Add or Remove Programs entry for clean uninstall. Subsequent versions install themselves silently via the in-app update banner.
CLI alternative:
gh release download --repo xt0n1-t3ch/DLSSync --pattern "*setup.exe"
.\DLSSync_*_x64-setup.exe
Build from source
Prerequisites: Rust stable (rust-toolchain.toml pins the version), Node 22 LTS, pnpm 9.
git clone https://github.com/xt0n1-t3ch/DLSSync.git
cd DLSSync
pnpm install
pnpm tauri dev
Release build:
pnpm tauri build
CI validators (run before opening a PR):
pnpm fmt:rust:check
pnpm lint:rust
pnpm --filter dlssync-frontend check
pnpm --filter dlssync-frontend build
cargo check --workspace
Footprint
| Metric | Target | Measured |
|---|---|---|
| Installer | under 10 MB | 4.5 MB |
| Cold start | under 500 ms | yes |
| Idle RAM | under 100 MB | yes |
| Idle CPU minimized | about 0 percent | yes (EcoQoS active) |
Roadmap
- v1.0: Windows portable, NSIS installer, auto-update banner, tray, EcoQoS Efficiency Mode, all 7 launchers, hash and Authenticode gates, Apache 2.0.
- v1.1: SignPath OSS Authenticode signing. Removes the SmartScreen warning on first run.
- v1.2: Per-DLL changelog viewer with diff against the currently installed build.
- v1.3: Custom catalog sources for community-maintained DLL trees.
FAQ
How is this different from DLSS Updater or DLSS Swapper?
DLSSync writes the new DLL into the game's own folder. It does not symlink, hook the loader or proxy load. The whole project ships as a single signed binary. No Python runtime, no .NET dependency. The hash and Authenticode gates are mandatory by default and configurable in Settings > Advanced for development builds. Apache 2.0 and you can read every line in this repository.
Does it work with anti-cheat?
The app writes a DLL into the game's own install directory. That is the same operation a manual file swap performs. Anti-cheat systems that detect modified game files (EAC, BattlEye, Vanguard, Denuvo Anti-Tamper) treat a swapped DLL as a tampered file. Check the policy of your specific title before applying an update.
Does the app phone home?
The only outbound traffic is:
api.github.comfor the release update check, capped at one request every 6 hours.cdn.jsdelivr.netfor the DLL catalog manifest.cdn.cloudflare.steamstatic.comandcdn2.steamgriddb.comfor game cover art, only if the art is not already cached locally.
Every request is unauthenticated. No hardware identifier, install list or other identifying information is sent.
Why Windows only?
Linux support is coming soon as more testing is needed.
How do I roll back if an update breaks a game?
Open the Backups tab. Every DLL the app has replaced is listed with the timestamp, original version, SHA-256 and a Restore button. Snapshots live at %USERPROFILE%\DLSSync\Backups\ as plain files and you can copy them out manually.
Can I pin a specific DLL version?
Yes. In the game detail drawer, every DLL family has a version picker covering every release tracked in the catalog, including historical and experimental builds. Pinned versions are stored in settings.json and survive rescans.
Does it touch DRM, Denuvo or anti-cheat binaries?
No. The app reads and writes DLL files inside the game directory. It never patches executables, never touches DRM binaries, never alters anti-cheat files.
Contributing
See CONTRIBUTING.md. Branch off main, keep commits focused, run the validator chain before opening a PR.
Author
xt0n1.com
If DLSSync saved you a manual DLL swap, a star on the repository helps other gamers find it.
License
Apache 2.0. See LICENSE and the attribution in NOTICE.
DLSSync is an independent open-source project. It is not endorsed by, sponsored by or affiliated with NVIDIA, Intel, AMD or Microsoft. DLSS, NVIDIA, GeForce, RTX, Reflex and Streamline are trademarks of NVIDIA Corporation. XeSS, Xe and Arc are trademarks of Intel Corporation. FidelityFX, FSR and Radeon are trademarks of Advanced Micro Devices, Inc. DirectStorage, DirectX and Windows are trademarks of Microsoft Corporation. Every redistributed vendor DLL retains its original Authenticode signature.
