Small tools for practical tasks.

Convert text or local files using standard or URL-safe Base64 — free, instant, and private.

Compare two JSON documents and see exactly which keys were added, removed, or changed, with the full path to each — free and instant.

Format, validate, and minify JSON instantly — free, private, and works entirely in your browser.

Decode and inspect a JSON Web Token (JWT) — see its header and payload instantly, entirely in your browser.

Calculate how your savings or investment grows over time with compound interest — free and instant.

Calculate your monthly payment, total interest, and total cost for any fixed-term loan — free and instant.

Calculate your monthly mortgage payment, total interest, and total cost from your loan amount, rate, and term — free and instant.

Calculate your Body Mass Index (BMI) from your height and weight, and see which category you fall into — free and instant.

Estimate your body fat percentage from a few tape-measure measurements using the U.S. Navy method — no scale or scan required. Free and instant.

Estimate your Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR) from your body stats and activity level — free and instant.

Calculate how much paint — and primer, if you need it — a room takes from its wall size, coats, and coverage rate. Free and instant.

Calculate how many tiles you need for a room, including extra for cuts and breakage — free and instant.

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE — free, instant, and works entirely in your browser.

Turn any title or sentence into a clean, URL-safe slug — lowercase, hyphenated, with accents stripped. Free, instant, and works entirely in your browser.

Compare two blocks of text line by line and see exactly what was added, removed, or unchanged — free, private, and works entirely in your browser.

Count words, characters, and sentences in your text instantly — free, private, and works entirely in your browser.