Fast, free online tools that run entirely in your browser

Count words, characters, sentences and paragraphs instantly, with an estimated reading time — free and private, right in your browser.

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and kebab-case in one click.

Format, validate and minify JSON instantly in your browser. Clear error messages with line hints — your data is never uploaded.

Encode text to Base64 or decode Base64 back to text, with full Unicode support. Runs locally — safe for tokens and secrets.

Percent-encode text for safe use in URLs, or decode an encoded URL back to readable text. Instant, free and fully in-browser.

Generate one or many random version-4 UUIDs using your browser’s cryptographic random source. Copy individually or all at once.

Generate strong random passwords with custom length and character sets, using cryptographic randomness — never sent anywhere.

Three percentage calculators in one: find X% of a number, what percent X is of Y, and the percentage change between two values.

Calculate your Body Mass Index in metric or imperial units and see where it falls on the standard WHO categories. Free and private.

Work out an exact age in years, months and days from a date of birth, plus total days lived and a countdown to the next birthday.