The whole toolbox at a glance — converters, calculators, colour checkers and generators that run entirely in your browser.
Length, weight, volume, area, speed, temperature, time and digital storage — exact factors, every unit at once, nothing uploaded.
Days between any two dates, add or subtract days, exact age in years-months-days, working days and days to your next birthday.
WCAG contrast ratio between any two colours with AA/AAA verdicts, the nearest accessible colour, and tints & shades palettes.
True random passwords from your browser’s cryptographic generator, with honest entropy maths — the password never touches our server.
Word counter, case converters (camelCase, snake_case, kebab…), URL & Base64 encoders and SHA-256 hashing — all offline, all instant.
BMI with WHO bands, your healthy weight range for height, BMR and daily calorie needs (Mifflin-St Jeor) plus body-fat and waist-to-height estimates.
Shrink a photo or screenshot right in your browser — resize, pick quality, compare before/after and download. Your file never uploads anywhere.
Look up any word’s meaning and translate it across dozens of human languages — plus ancient scripts and playful animal, alien and sound “languages”, with spoken pronunciation.
What is X% of Y, X is what percent of Y, percent change and add-or-subtract a percentage — with the arithmetic printed beside every answer.
Monthly loan payments, total interest, the effect of extra payments, and compound savings growth — the maths printed honestly, no quote requested.
Turn a link, text or Wi-Fi network into a QR code in your own browser, with error-correction controls and a print-ready PNG download.
Your public address, the ISP-level location databases infer from it, and every browser field a website can read — shown openly, nothing stored.
Epoch to date and back, with seconds/millisecond auto-detection, ISO 8601, your local zone and a live ticking clock.
Unbiased integers, d4–d100 dice and a raffle-style list picker — drawn from crypto.getRandomValues with rejection sampling, so nothing is favoured.
Merge, extract, delete, rotate and split PDF pages without uploading the file — the document is opened and re-saved by your own browser.
Format, minify and validate JSON with the exact line and column of a syntax error; large numbers and key order survive because it scans instead of re-parsing.
MD5, SHA-1, SHA-256, SHA-384 and SHA-512 of text or a whole file at once — verify a download against its published checksum privately.
UTF-8-correct Base64 both ways, URL-safe output, and a file turned into a data: URL — with the honest note that encoding is not encryption.
Compare up to eight cities hour by hour and find the call time that works for everyone — real IANA offsets and daylight saving, computed in the browser.
Random v4 and time-ordered v7 identifiers in bulk, plus a decoder that shows the version, variant and any embedded timestamp.
Any five-field cron schedule in plain English with its next ten runs, every field validated — including the day-of-month/day-of-week OR trap.
Test JavaScript regular expressions with live match highlighting, group inspection, and a common-pattern library (email, URL, IPv4, dates).
Paste CSV or TSV and see it as a formatted table instantly. Convert to JSON, copy or download — RFC 4180 compliant, all local.
Compare two blocks of text line-by-line or word-by-word: additions, deletions and unchanged parts highlighted instantly.
Break a URL into protocol, host, port, path, query parameters and fragment. Encode and decode components side-by-side.
Inspect any character: Unicode code point, HTML entity, UTF-8 bytes and UTF-16 unit count — a quick-reference for invisible bugs.
A live on-screen compass from your device’s magnetometer, plus the true-north bearing and great-circle distance to 46 world cities (a qibla pointer, the way home, the next town).
Tukuk-OS