TECHNICAL GLOSSARY · STANDARDS DEFINITION · VERIFIED 2026-11-10

OPFS

Authoritative Definition

Origin Private File System (OPFS) is a fast, highly optimized private filesystem accessible to web pages for zero-latency local caching of large binaries and models.

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Common Aliases:Origin Private File Systemnavigator.storage.getDirectory
## High-Performance Browser Storage The Origin Private File System provides web applications with direct, byte-addressable access to local storage without prompting users for file permissions on each access. PrivacyFold uses OPFS to cache verified WebAssembly binaries and on-device AI model weights locally so repeat tool executions launch instantaneously with zero network delays.

Related Client-Side Privacy Tools

Run the in-browser implementations adhering to OPFS with zero server uploads.

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