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Dev.to
6/23/2026
How I Built a Privacy-First PDF Toolkit That Runs Entirely in the Browser

How I Built a Privacy-First PDF Toolkit That Runs Entirely in the Browser

Short summary

FileFlex is a free, browser-based PDF toolkit that never uploads files to servers—built with Next.js, pdf-lib, and Web Crypto APIs. Core features: merge, compress (80% reduction), password-protect PDFs, and image compression. No signup, no file limits, no server costs.

  • •Privacy-first PDF toolkit runs entirely in browser using Web APIs
  • •Features: merge, compress, password-protect PDFs; image compression to JPEG/PNG/WebP
  • •Free, no signup, no file size limits; demo live at file-flex-psi.vercel.app

Generated with AI, which can make mistakes.

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