Bezpłatne. Szybkie. Bez rejestracji. Bez śledzenia. Wszystkie narzędzia działają lokalnie w przeglądarce — Twoje dane nigdy nie opuszczają urządzenia.
Oblicz miesięczne raty, łączne odsetki, harmonogram spłat.
Konwertuj natychmiastowo między 30+ walutami świata.
Miesięczne raty dla każdej pożyczki. Harmonogram spłat.
Ile to X% z Y? Zmiana procentowa.
Od brutto do netto. Podział podatków według kraju.
Calculate tip and split the bill. Quick and easy.
Oblicz wskaźnik masy ciała. Metryczny i imperialny.
Dzienne zapotrzebowanie kaloryczne. BMR, TDEE. Odchudzanie, utrzymanie, przyrost.
Pregnancy due date, trimester, gestational age.
Protein, carbs, fat. Balanced, keto, high protein.
4 formulas. Healthy BMI range for your height.
US Navy method. Fat mass, lean mass, category.
Exact age in years, months, days. Zodiac sign. Birthday countdown.
Days, weeks, months between two dates. Business days included.
Millisecond precision stopwatch with lap times. No app needed.
Live countdown to any date. Days, hours, minutes, seconds ticking.
Days until Christmas, New Year, Halloween & any custom date.
Live time in 12+ world cities. Add cities. Day/night indicator.
Convert length, weight, temperature, volume, area, speed, data & time.
Kryptograficznie bezpieczne hasła. Nigdy nie przechowywane.
Convert time between 24 zones. Live world clock. Meeting planner.
Sale price, stack discounts, buy X get Y. Black Friday ready.
Margin vs markup. Calculate selling price and profit.
Create professional invoices. Line items, tax, discounts. Download PDF. Free.
Return on investment. Net profit. Annualized ROI.
Generate company names by keyword. Domain availability.
Cost to selling price. Markup vs margin table.
Convert text to 20+ Unicode font styles for Instagram, TikTok & more
Count words, characters, sentences, paragraphs. Reading time & keyword density.
Generate placeholder text. Paragraphs, sentences, or exact word count.
UPPER, lower, Title, camelCase, snake_case, kebab-case & 6 more.
Browse and copy all emojis. Search by name. 9 categories. One-click copy.
Write Markdown, see live HTML preview. Copy HTML. Split-pane editor.
Format, validate, minify JSON. Syntax highlighting. Error detection.
Generate MD5, SHA-1, SHA-256, SHA-512 hashes. Web Crypto API powered.
Encode text to Base64 or decode Base64 back. Image to data URI.
Compare two texts side by side. Additions in green, deletions in red.
Write regex, test against text, see matches highlighted in real time.
Twórz kody QR dla URL, WiFi, email, telefonu. Bezpłatny download PNG.
Reduce image size by up to 80%. JPEG, PNG, WebP. Nothing leaves your browser.
Create beautiful CSS gradients visually. Pick colors, angle, copy CSS.
Pick colors. Get HEX, RGB, HSL. Generate shades, tints, complementary.
Generate favicons from a letter or emoji. All sizes. Download PNG pack.
Frame screenshots in browser or device mockups. Gradient backgrounds.
Full scientific calculator — sin, cos, tan, log, powers, memory. Keyboard supported.
Square root, cube root, nth root, and perfect square checker.
Add, subtract, multiply, divide fractions. Mixed numbers & simplification.
Calculate GPA from grades and credit hours. 4.0 scale & letter grades.
Generate random integers, floats, or lists. Custom range & seed.
Convert numbers to Roman numerals and back. Supports 1–3999.
Running cost of any appliance per day, month & year. 12 presets.
Solve V, I, R, P from any two values. All 6 combinations.
Panels needed, system cost, annual savings & payback period.
Decode/encode 4 and 5 band resistors. Visual preview.
Liters needed for any room. Coats, doors & windows included.
AWG gauge by current, distance & voltage drop. Cu/Al.