The small tools you reach for every day.

A clean calculator with keyboard support.

X% of Y, percent change and “what percent is”.

Final price and savings after a discount and tax.

Split a bill and tip between any number of people.

Monthly payment, total interest and total cost of a loan.

Body mass index in metric or imperial units.

Exact age in years, months and days from a birth date.

Days, weeks and business days between two dates.

Length, weight, temperature, area, volume, speed and data.

Convert between HEX, RGB and HSL with a live preview.

Binary, octal, decimal and hexadecimal.

Epoch seconds to human dates and back.

Words, characters, sentences and reading time.

UPPER, lower, Title, Sentence, camelCase, snake_case and more.

Trim spaces, remove line breaks, dedupe and sort lines.

Replace text in bulk, with optional regex and case matching.

Turn any title into a clean URL slug.

Compare two texts line by line.

Pretty-print, minify and validate JSON.

Encode or decode Base64, UTF‑8 safe.

Percent-encode text or decode an encoded URL.

SHA‑1, SHA‑256, SHA‑384 and SHA‑512 digests.

Inspect the header and payload of a JSON Web Token.

Strong random passwords, generated on your device.

Random v4 UUIDs, one or a thousand at a time.

Placeholder paragraphs, sentences or words.

Random integers in any range, with or without repeats.