Free, private browser tools that just work
Small, fast utilities that run entirely in your browser — no login, no uploads, no tracking of your files. Convert PDFs and images, run 91 engineering calculators, format data and more.
Engineering Toolkit91 tools
91 free engineering calculators and unit converters — pressure, flow, beams, concrete, rebar and more. Private, no login, runs in your browser.
AI Prompt VaultApp
A swipeable deck of the 10 most useful GPT prompt frameworks for career, product, research and writing. Free, no login, copy in one tap.
PDF Toolkit9 tools
Merge, split, sign, watermark, number, fill and convert PDFs — all in your browser. Free, no uploads, private.
Image Toolkit7 tools
Compress, resize, convert, crop and read metadata from images — plus a favicon generator. Free, private, in your browser.
Developer Toolkit10 tools
JSON formatter, Base64, URL encoder, JWT decoder, UUID, hashes, timestamps, diff and color tools. Free, private, in your browser.
Analytics Toolkit9 tools
Explore, clean, convert, chart and pivot CSV data privately in your browser. Free, no upload.
ReflexApp
Test your reaction speed — tap when the screen turns green and get your time in milliseconds. Free, works on mobile and desktop.