The internet is full of paid apps for things you can do for free in your browser. We have built a complete collection of fast, privacy-friendly tools that need no downloads and no sign-up. Here are the best free online tools to bookmark in 2026, organised by what you need to do.
Best calculators
From everyday math to big financial decisions, these calculators save time: the basic Calculator and Scientific Calculator for quick sums, the Percentage Calculator, and money tools like the Loan Calculator, Mortgage Calculator and Compound Interest Calculator. Shoppers love the Discount Calculator and Tip Calculator.
Best converters
Convert anything: the Unit Converter for length, weight and temperature, the Currency Converter with live rates, plus the Number Base Converter and Roman Numeral Converter for the number nerds.
Best PDF and image tools
Handle documents without expensive software: Merge PDF, Split PDF, JPG to PDF, plus the Image Compressor and Image Resizer. Need a QR code? Use the QR Code Generator.
Best tools for writers
The Word Counter and Word Frequency Counter help you tighten your writing, while the Case Converter and Text Diff Checker handle formatting and comparisons.
Best developer tools
Developers can format and validate data with the JSON Formatter and CSV to JSON Converter, test patterns with the Regex Tester, generate IDs with the UUID Generator, and design with the CSS Gradient Generator.
Best security tools
Stay safe with the Password Generator and Password Strength Checker.
Every tool above is 100% free, works on mobile and desktop, and runs in your browser so your data stays private. Browse the full collection on our All Tools page.