About
Learn about the Tools Hub service and our operating principles.
Service Overview
Tools Hub offers everyday free online utilities such as image compression, PDF editing, QR code generation and discount calculation. 121 tools are currently available, with more added regularly.
Privacy Principles
All tools run in your browser, and files are never uploaded to any server. See our Privacy Policy for details.
Available Tools
We provide 121 tools across categories including image, document, developer and utility.
Updates
August 11, 2026: Added discount, tax and unit converters; implemented tool search
Verification & Quality Assurance Standards
Sources, assumptions and verification scope
We publish assumptions, example inputs and references. Verification is limited to the stated cases and scope; it is not a guarantee for every input, experimental measurement, expert review or standards compliance.
Popular Tools
Quadratic Equation
Solve ax² + bx + c = 0 with real or complex roots, the discriminant and substitution into the quadratic formula.
Constant Acceleration
Calculate velocity and displacement from initial velocity, constant acceleration and time, with unit conversion and worked steps.
Moles & Molarity
Calculate molarity from moles and solution volume, or convert mass to moles with a supplied molar mass. View results in mol/L and mmol/L.
Dilution Calculator
Find the required stock volume from stock concentration, target concentration and final solution volume using C₁V₁ = C₂V₂.
Significant Figures Calculator
Count significant figures, round to a chosen precision, and apply the multiplication/division or addition/subtraction rules. Switch between half-up and JIS Z 8401 half-even rounding; scientific notation is shown alongside.
Hex & Text Converter
Convert Hex bytes and UTF-8 text in your browser. Inspect byte counts, Japanese characters and invalid UTF-8 without uploading data.