How TinyPDF Cut Browser-Side PDF Processing Time from 12 to 2 Seconds

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Developer Oren built TinyPDF, a fully client-side PDF compression tool that requires no file uploads or backend servers. An initial test with an 88MB, 45-page PDF caused the browser tab to freeze for 12 seconds, prompting a series of performance overhauls. The key fixes included offloading PDF parsing to a Web Worker to keep the main thread responsive, processing pages one at a time to avoid loading all images into memory simultaneously, and applying adaptive image quality scaling based on each image's original size. Additional gains came from caching repeated image assets and using binary search to efficiently hit target file sizes. Together, these optimizations reduced processing time to around 2 seconds for large files while preserving all existing features.

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