Free Browser-Based Tools Client Side Only, No Uploads, No Tracking

I got tired of juggling 20+ tabs for basic utilities (JSON formatting, PDF merging, regex testing, image resizing, fake document generators, etc.), so I built a single, fully client-side hub with over 200 tools that run entirely in the browser. Key points:

Everything processes locally—no server uploads, no data leaves your device, no sign-ups, no ads, no tracking. Works offline after the initial load (progressive web app vibes). Categories include: Developer Tools (JSON/YAML/CSV/Regex/Base64/Epoch/etc.), PDF Tools (merge/split/compress/convert/extract), Image Tools (resize/compress/watermark remover/background remover/OCR), Encoding & Security, SEO & Network utilities, AI-assisted tools (e.g., ATS resume checker/roaster), Finance calculators (GST/salary/tax), Document & Fake Generators (resumes/invoices/fake chats/tickets/etc.), and more niche ones.

Built with plain HTML/JS/Canvas/WebAssembly where needed—lightweight, fast, mobile-friendly. Live here: https://tools.geeksprep.com/ Why share now:

Started as a personal productivity fix for devs/designers/job seekers in India (Bengaluru-based side project). Grew to 200+ tools via user requests and iterative additions. Privacy angle is core: In a world of upload-heavy "free" tools, this keeps your data yours.

Would love honest feedback from HN:

Which tools are actually useful (or broken)? Missing must-haves in dev/productivity space? Performance/edge cases on large files or specific browsers? Suggestions for better UX or new categories?

It's open for iteration—happy to add/fix based on real input. Thanks for checking it out! (Part of the broader GeeksPrep career prep platform, but this tools subdomain is 100% free/independent.)