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SQLite Wasm + OPFS: Building Sub-Millisecond Persistent In-Browser Databases

A comprehensive systems guide to running SQLite in web browsers using WebAssembly and Origin Private File System (OPFS). We benchmark synchronous I/O, multi-tab locking, web worker offloading, and local-first CRDT synchronization.

Sachin Sharma
Sachin SharmaCreator
Sep 2, 2026
8 min read
SQLite Wasm + OPFS: Building Sub-Millisecond Persistent In-Browser Databases
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A comprehensive systems guide to running SQLite in web browsers using WebAssembly and Origin Private File System (OPFS). We benchmark synchronous I/O, multi-tab locking, web worker offloading, and local-first CRDT synchronization.

SQLite WasmOPFSLocal-FirstWebAssemblyIndexedDB vs SQLiteBrowser Storage
Sachin Sharma

Sachin Sharma

Software Developer & Mobile Engineer

Building digital experiences at the intersection of design and code. Sharing weekly insights on engineering, productivity, and the future of tech.

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