Get the free OSDF Viewer
The OSDF Viewer opens and verifies documents anywhere - online or fully disconnected. Every release is signed, reproducible, and recorded in the public transparency log, so you can verify exactly what you run before you run it.
Free to download. Free to verify.
The Viewer is the downloadable OSDF app. Authoring tools run in the browser, and developer tooling is open source.
Desktop Viewer
Open and verify OSDF documents on macOS, Windows, and Linux - fully offline.
Browser Viewer
Open .osdf files with the same dark UI as the site. Requires Microsoft Entra sign-in - available to customer and admin portal roles.
Launch viewerCompanion Agent
The local trust broker that enforces document access policies at the edge. Signed installers for Windows, macOS, and Linux with SHA-256 checksums and MDM deployment packages.
Prefer to stay in the browser?
Create, view, and verify documents on the web.
Web Viewer
Open and verify .osdf files in your browser - Entra sign-in required. Same local WASM engine as the public verifier.
Launch viewerWeb Editor
Create, sign, and convert documents right in your browser - nothing to install.
Launch web appVerify online
Run the full verification pipeline in your browser without downloading anything.
Verify a DocumentVerification CLI - open source
The reference core and CLI live in the open. Install from a package manager or build from source, then verify the binary against the transparency log.
- Open source in the osdf-systems/osdf repository
- Signed & reproducible release builds
- Logged in the public transparency log
# install from a package managerbrew install osdf-systems/tap/osdf # verify the binary against the transparency logosdf self verify $(which osdf) osdf verify ./document.osdfViewer version history
Synced automatically from GitHub releases - refreshed every hour.
- Faster local verification (0.2–0.6 ms typical)
- Improved offline trust-evidence handling
- Accessibility and rendering fixes
- Witness cosignature verification in the Viewer
- Expanded transparency-log checks
- Performance improvements on large documents
- Hardened constrained-ZIP parser
- Consistency-proof caching
- PDF/A rendition fidelity improvements
The future of trusted documents
Bring cryptographic verification, verifiable provenance, and zero-trust access control to every document your organization creates and receives.