Handy tools

Enter your Korean annual salary and instantly see 2026 take-home pay after social insurance and income tax — plus a salary-bracket comparison table.

Recurring or lump-sum, simple or compound, with after-tax payout — enter a rate and term for instant maturity interest!

Feeling lucky? Generate Korean Lotto 6/45 picks with fixed numbers, exclusions, odd/even balance, and prize-tax math in one page.

Check your BMI with WHO or Asian cutoffs, see the healthy weight range for your height, and compare 4 ideal weight formulas.

Enter your stats to see your BMR, maintenance calories (TDEE) and ±500 kcal cut and bulk targets.

Estimate body fat % with the US Navy tape method from height, neck and waist (plus hips for women).

Split your daily calories into protein, carbs and fat grams by target ratio.

Estimate your one-rep max from a lighter set, with a %1RM chart and strength grade.

Enter any two of distance, time, or pace and the running pace calculator fills in the third instantly.

Enter your last period and cycle length to get your ovulation day, fertile window, next period and due date at once!

How old are you exactly? Enter your date of birth for your age in years, days lived and a countdown to your next birthday.

How many days until your exam, trip or deadline — or since a big day? Live countdown, weekday count and up to 10 saved dates.

How many days between two dates? What day is N days from now? Duration and date add/subtract in one page.

If your whole life were one 24-hour day, what time would it be now? Enter your birthday and pick 80 or 100 years to find out.

Birth year → age & Chinese zodiac at a glance

Which anniversary is it? Traditional names by year and a countdown

Convert Gregorian to Hijri and back, or find your age in Hijri years. Free, no sign-up.

N% of a value, ratios, percent change, and discounts — enter two numbers and get instant results!

Add up the Advanced Forticlad Cores and Forticlad Cores your FC building upgrades need — all 7 buildings at once.

Resize, crop and compress photos in your browser. Up to 20 images at once, target size in KB, JPG/WebP/PNG output, no upload.

Convert HEIC, WebP and PNG to JPG, PNG or WebP in your browser. Up to 30 photos at once, free, no upload.

Crop a passport or ID photo to size in your browser: 22 country presets, auto face fit and a free 4×6 print sheet.

Find faces in a photo automatically and pixelate, blur or block them out in your browser, with no upload.

Check whether a photo shows where it was taken, then remove EXIF and GPS data without quality loss. Up to 30 photos, no upload.

Pull 5–10 main colors from a photo with their % share, HEX, RGB and HSL codes, plus the closest named color.

Draw pixel art online for free on a 16x16, 32x32 or 64x64 grid, then save a crisp PNG with a transparent background.

Copy HEX, RGB and HSL codes for 52 named colors — from red and blue to crimson and teal.

Paste text, pick from 15 mask shapes, get a word-frequency cloud — and download a PNG, all for free.

Count characters with and without spaces, words, sentences, lines and bytes as you type, with a target-length bar.

Compare two versions of a text line by line, with removed lines in red and added lines in green. Runs in your browser.

Pretty-print JSON with 4-space indentation and validate it in your browser, with the error's line and column when it's invalid.

Generate strong random passwords in one second with length, case, number, and symbol options.

Test how strong your password is — 100% in your browser.

Generate QR codes for URLs, Wi-Fi, contacts, social, calendar, maps — 11 types, one-click, free download.

Build campaign URLs with utm_source, medium, campaign and more. Presets for Instagram, YouTube, newsletters and QR codes, plus one-click copy.

Translate text to Morse code and back as you type — hear the beeps, watch the light blink, set 5–30 WPM.

Dead pixels, refresh rate (Hz) and ghosting — test your screen in the browser, no install.

A full-screen pure white (and other solid colors) — for lighting, dead pixel checks and screen cleaning, right in the browser.

Pure black in full screen — spot backlight bleed and stuck pixels, or darken a spare monitor. No install.

Try to free a stuck pixel with a fast color-flashing box, or run a slow color cycle to check your screen.

Check that every key works — spot dead keys, stuck keys and ghosting, right in your browser.

Test mouse buttons, wheel, double-click and chatter (misfiring clicks) in your browser.

Measure how many times per second your mouse reports its position (Hz), live.

Switching FPS games? Keep the same aim. Convert your sens between Valorant, CS2, Apex and more via cm/360.

Check every button, trigger and analog stick — and catch stick drift — right in your browser.

Check dead zones, multi-touch and swipe trails right in your browser

Check that your mic picks up sound — volume meter, live waveform and pitch, right in your browser.

Check your speakers or headphones and confirm the left/right channels aren't swapped — right in your browser.

Check your webcam in the browser — live preview, resolution and frame rate, with camera switching and snapshots.

Measure ambient noise in decibels (dB) with your mic — live level plus average and max, right in your browser.

Mix rain, waves, fire and white noise into your own calming soundscape — with a sleep timer.

Binaural beats & isochronic tones for focus, relaxation and sleep — brainwave presets, ambient mix and a timer.

A free online tone generator that plays a pure sine, square, sawtooth, or triangle tone from 20 Hz to 20,000 Hz.

A free online metronome with BPM 30–240, tap tempo, time signatures and a strong first-beat accent. No install.

Online chromatic tuner that uses your mic: nearest note and cents sharp or flat in real time, with guitar, ukulele and bass presets.

Settle who buys coffee, chore duty or turn order with a ghost-leg ladder — tap a name and watch the path. 2–10 players.

From lunch picks to who buys coffee, one spin settles it — a random picker wheel with your own options and optional weights.

Named marbles race through pegs, spinning bars and funnels — the finishing order makes the pick. A draw everyone can watch.

Free Secret Santa generator — draw names online, no sign-up, private link per person.

Break awkward silences with random icebreaker questions, from light small talk to deeper ones, for parties, classrooms and team meetings.

Turn your phone into a scrolling neon LED sign — pick text, colors, speed and glow, then play fullscreen.

+1, +44, +81… Find the country calling code for 98 countries, see how to dial from a mobile or landline, and look up South Korean area codes.