Free · client-side · no account
Tools that run
in the tab, not the cloud.
Formatters, converters, generators and calculators. No sign-up, no uploads, nothing leaves your device.
Browse all 15 tools or pressCtrlK
Index
All tools
15 / 15
Developer tools
Free developer tools that run in your browser: JSON formatter, Base64 and URL encoders, JWT decoder, hash and UUID generators, and a regex tester.
01
JSON FormatterFree JSON formatter and validator: beautify, minify and fix errors fast.02
Base64 Encoder / DecoderBase64 encode or decode text online with UTF-8 and URL-safe support.03
URL Encoder / DecoderURL encoder and decoder for query strings, paths and full URLs, in one click.04
JWT DecoderJWT decoder: view header, payload and claims and check expiry in your browser.05
UUID GeneratorUUID generator for random v4 UUIDs and GUIDs, one at a time or 1000 in bulk.06
Hash GeneratorHash generator for MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of text.07
Regex TesterRegex tester with live highlighting, capture groups and flags for JavaScript.Text tools
Free text tools for writers and coders: count words and characters, convert text case, and generate strong passwords, all processed in your browser.
Finance calculators
Free finance calculators: loan payments and amortization, compound interest growth, and everyday percentage maths for tax, tips and discounts.
13
Loan CalculatorLoan calculator for monthly payment, total interest and amortization schedule.14
Compound Interest CalculatorCompound interest calculator with monthly contributions and a yearly table.15
Percentage CalculatorPercentage calculator for percent of, percent change, tax, tips and discounts.Converters
Free online converters for units and colors: length, weight, temperature, volume and data units, plus HEX, RGB and HSL codes with a WCAG contrast check.