Browser-Based PDF Toolkit Processes Files Locally Using WebAssembly

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DeskRamp is a Chrome extension that performs PDF operations such as merging, splitting, compressing, and converting entirely within the browser, without uploading files to a server. The tool is built on WebAssembly-compiled PDF libraries, which are now fast enough to run client-side and handle most tasks almost instantly. Developers had to navigate key technical hurdles, including adding an explicit 'wasm-unsafe-eval' exception to Chrome's Manifest V3 Content Security Policy and lazy-loading multiple specialized libraries to keep install size manageable. The biggest runtime constraint proved to be browser tab memory rather than processing speed, requiring chunk-based processing and careful manual release of memory references for large documents. The privacy benefit is the core motivation: sensitive files like contracts and financial documents never leave the user's device.

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