All Tools

Explore math, physics and chemistry calculators alongside image, PDF and text utilities. Browse by subject or search by keyword.

Mathematics & Statistics

Quadratic Equation

Solve ax² + bx + c = 0 with real or complex roots, the discriminant and substitution into the quadratic formula.

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Mathematics & Statistics

Statistics Calculator

Paste numbers to get count, sum, mean, median, min, max and standard deviation at once. Handles newline, comma and space separators.

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Mathematics & Statistics

Fraction Calculator

Add, subtract, multiply and divide fractions with exact results. See the reduced answer plus mixed-number and decimal forms, with the working shown.

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Mathematics & Statistics

Prime Factorization

Factor an integer at least 2 with up to 15 digits. Check product and exponent forms, positive divisor count and primality. Press Factorize or Enter to run.

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Mathematics & Statistics

Permutation & Combination Calculator

Compute nCr, nPr and n! with exact big-integer arithmetic. Large results such as lottery odds never overflow, and every calculation shows its working step by step.

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Mathematics & Statistics

Trigonometry Calculator

Enter an angle to get sin, cos and tan at once. Special angles like 30°, 45° and 60° are shown as exact values (1/2, √3/2), with degree and radian support, pi expressions such as pi/6, plus the quadrant signs and the reference-angle working.

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Mathematics & Statistics

Logarithm Calculator

Compute logarithms in any base, like log₂(8). One-tap bases for 2, 10 and e, with the change-of-base working (ln x ÷ ln b) and a check that bʸ returns x. Common and natural logarithm notes included.

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Mathematics & Statistics

Sequence & Series Calculator

Compute finite arithmetic and geometric terms and sums with substituted working. Supported integer inputs use exact BigInt; decimal and other paths are approximate. Check term-count and ratio limits.

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Mathematics & Statistics

Vector Calculator (Dot Product)

Compute the dot product, magnitudes and the angle between 2D or 3D vectors with fully substituted working. Includes the cosθ = (a·b) ÷ (|a||b|) step and perpendicular detection via a·b = 0 — handy for math and physics.

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Mathematics & Statistics

Matrix Determinant & Inverse

Compute the determinant and inverse of 2×2 and 3×3 matrices with cofactor-expansion working. Detects singular matrices (det = 0) and verifies the inverse — useful for math B and linear algebra students.

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Mathematics & Statistics

GCD & LCM Calculator

Compute the greatest common divisor (GCD) and least common multiple (LCM) of two or three positive integers with exact BigInt arithmetic and the Euclidean algorithm working shown.

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Mathematics & Statistics

DMS ↔ Decimal Degrees Converter

Convert angles between degrees-minutes-seconds (DMS) and decimal degrees. Useful for GPS coordinates and astronomical observations, showing the substituted formula for values like 30°45′30″ → 30.758333°.

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Mathematics & Statistics

Distance Calculator

Compute the Euclidean distance between two points in 2D or 3D with fully substituted working. Supports negative and decimal coordinates — useful for coordinate geometry and vector calculations.

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Mathematics & Statistics

Exponent Calculator

Calculate powers from a base and exponent. Safe integer bases with nonnegative integer exponents use BigInt; negative exponents and decimals are approximate. Inspect signs, scientific notation and the 0⁰ convention.

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Mathematics & Statistics

Deviation Score Calculator

Compute the deviation score from the mean, standard deviation and individual score. Shows substituted working: 50 is the mean, and a 10-point difference represents one standard deviation.

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Mathematics & Statistics

Linear Function Calculator

Find the slope a and intercept b of y = ax + b from two points, with the substituted rate-of-change formula. Useful for middle-school linear functions and trend analysis.

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Mathematics & Statistics

Complex Number Calculator

Add, subtract, multiply and divide complex numbers a + bi, with the expansion using i² = −1 and conjugate-based division shown step by step. Also shows the modulus, argument, conjugate and polar form.

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Mathematics & Statistics

Simultaneous Equation Solver

Solve systems of two or three linear equations with the elimination method shown step by step. Fractional solutions appear in exact reduced form, and inconsistent or dependent systems are detected. Ideal for checking school algebra homework.

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Mathematics & Statistics

Least Squares Regression

Paste data points to fit a least-squares regression line y = ax + b with slope a and intercept b. See the sums (Σx, Σy, Σx², Σxy), Sxx and Sxy, the correlation r, R², a scatter plot with the fitted line, residuals and predictions from x — with the working shown.

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Physics

Constant Acceleration

Calculate velocity and displacement from initial velocity, constant acceleration and time, with unit conversion and worked steps.

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Physics

Significant Figures Calculator

Count significant figures, round to a chosen precision, and apply the multiplication/division or addition/subtraction rules. Switch between half-up and JIS Z 8401 half-even rounding; scientific notation is shown alongside.

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Physics

Equivalent Resistance Calculator

Compute the equivalent resistance of resistors in series or parallel with fully substituted working. Handles 2 to 4 resistors and cross-checks the two-resistor parallel shortcut R₁R₂ ÷ (R₁ + R₂) — handy for physics circuits.

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Physics

Half-Life Calculator

Compute the remaining amount after any elapsed time with N = N₀ × (1/2)^(t/T). Includes carbon-14 dating (5730 years) and drug-metabolism examples, plus the remaining percentage, half-lives elapsed and the decay constant λ.

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Physics

Ohm's Law Calculator

Enter any two of voltage V, current I, resistance R and power P to compute the other two via V = IR and P = VI. All six combinations with substituted working — pairs naturally with the equivalent resistance tool.

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Physics

Projectile Motion Calculator

Calculate peak height, flight time, horizontal range, and impact velocity for projectile motion and horizontal projection from initial speed, angle, initial height, and gravity. Includes SVG trajectory plots, worked solutions, and state at time t.

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Physics

Heat & Specific Heat Calculator

Calculate heat with Q = mcΔT, heat capacity with Q = CΔT, the final temperature when two objects mix, and latent heat with Q = mL. Shows unit conversions (J, kJ, cal, kcal, g, kg), the working and whether heat is absorbed or released.

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Physics

Pressure, Water Pressure & Buoyancy Calculator

Calculate pressure p = F ÷ S, water pressure p = ρgh and buoyancy F = ρVg (Archimedes’ principle) with unit conversion for N, g, kg, cm², m², Pa, hPa, kPa, g/cm³, kg/m³, cm³, m³ and L. Shows the working, total pressure including the atmosphere, and whether an object floats or sinks.

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Physics

Doppler Effect Calculator

Calculate Doppler effect frequency, wavelength, and pitch shifts for moving sound sources and observers. Includes temperature-dependent sound speed (V = 331.5 + 0.6t), wind correction, wall echoes, beat frequencies, and speed detection from frequencies with worked steps.

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Physics

Thin Lens Calculator

Calculate image distance, magnification, and orientation (real/virtual, inverted/upright) using the thin lens equation (1/a + 1/b = 1/f) and ray tracing. Includes eyeglass diopters and compound lens systems.

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Physics

Snell’s Law & Refraction Calculator

Calculate refraction angles, relative refractive index, speed ratio, and wavelength ratio using Snell’s law (n₁ sin θ₁ = n₂ sin θ₂). Includes total internal reflection (TIR) verification, critical angle (θc), Snell’s window radius, and optical fiber numerical aperture (NA) with ray tracing.

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Physics

Wave Optics & Light Interference Calculator

Calculate Young’s double-slit experiment (fringe spacing, path difference, intensity profile), diffraction grating (grating pitch, diffraction angle, max order, angular dispersion), and thin-film interference (phase reversal, visible interference colors, anti-reflection coating) with real-time spectrum simulation.

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Physics

Simple Harmonic Motion & Pendulum Calculator

Calculate simple pendulum periods (T = 2π√(L/g), Borda’s finite-amplitude correction, gravity inversion), spring-mass oscillators (series & parallel effective stiffness, vertical equilibrium stretch), and general harmonic waveforms (displacement, velocity, acceleration phase shifts & conserved mechanical energy) with interactive simulations.

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Physics

Error Propagation Calculator

Find the uncertainty of a formula result from measured values and their uncertainties. Shows each measurement’s contribution through partial derivatives, the root sum of squares and the maximum error, and a value ± uncertainty rounded to significant digits.

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Physics

RLC Circuit & Resonance Calculator

Calculate impedance Z, phase angle θ, resonance frequency f₀, Q factor, current, and component voltage drops for series and parallel RLC circuits with interactive phasor diagrams, resonance curves, and reverse LC tuning.

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Physics

Circular Motion & Centripetal Force Calculator

Calculate angular velocity ω, period T, rpm, tangential velocity v, centripetal acceleration, and force F for uniform circular motion. Features centrifuge RCF (×g) conversion, vehicle bank angle, and vertical loop dynamics.

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Physics

Fluid Dynamics & Bernoulli Calculator

Calculate pipe flow velocity, dynamic pressure, pressure drop, and total head using Bernoulli’s principle and continuity equation. Features Venturi/Pitot flow meters, Torricelli tank discharge/drainage time. Ideal-fluid study model; no cavitation diagnosis.

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Physics

Heat Engine, Carnot Cycle & COP Calculator

Calculate Carnot cycle maximum theoretical efficiency (η = 1 - TC/TH), actual heat engine work/heat rejection/Second Law feasibility (entropy generation), Otto & Diesel air-standard cycles, and heat pump/refrigeration COP with absolute temperature conversion and interactive energy flow Sankey diagrams.

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Chemistry

Moles & Molarity

Calculate molarity from moles and solution volume, or convert mass to moles with a supplied molar mass. View results in mol/L and mmol/L.

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Chemistry

Dilution Calculator

Find the required stock volume from stock concentration, target concentration and final solution volume using C₁V₁ = C₂V₂.

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Chemistry

pH Calculator

Compute pH from hydrogen ion concentration or the reverse, in both directions. Accepts e-notation like 1e-7 and shows the substituted pH = −log₁₀[H⁺] working plus an acidic / neutral / basic classification based on 25 °C water.

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Chemistry

Solubility & Recrystallization Calculator

From the solubility per 100 g of water, compute the maximum dissolved amount, the composition of a saturated solution, and the crystals precipitated on cooling or evaporation — with the mass-balance steps shown.

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Chemistry

Acid-Base Titration Calculator

Work through acid-base titration calculations with the mole working shown: find an unknown concentration, the volume needed for neutralization, or the original concentration after dilution. Enter the acid and base valences directly.

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Chemistry

Redox Titration Calculator

Work through redox titration calculations with the electron moles shown: find an unknown concentration, the volume needed for the reaction, or the result of an indirect iodine titration with thiosulfate. Pick a substance and the electron count is filled in from its half-reaction.

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Chemistry

Bond Energy & Reaction Enthalpy Calculator

Work out the reaction enthalpy ΔH from average bond energies. Pick the bonds broken and formed from a table, enter the counts, and see the totals, the subtraction and whether the reaction is exothermic or endothermic. A reverse mode finds an unknown bond energy from ΔH.

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Chemistry

Ideal Gas Law Calculator

Solve PV = nRT for pressure, volume, amount or temperature with unit conversions (Pa, kPa, atm, mmHg, L, mL, °C, K) and the working shown. The combined gas law P₁V₁/T₁ = P₂V₂/T₂ and gas density or molar mass with ρ = PM/(RT) are supported too.

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Chemistry

Mass Percent Concentration Calculator

Work out mass percent concentration from solute, solvent and solution masses, find the solute and water needed for a target solution, mix or evaporate solutions, and convert between mass percent and molarity using density and molar mass — all with the working shown.

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Chemistry

Beer-Lambert Law, Absorbance & Calibration Calculator

Solve the Beer-Lambert Law (A = εcℓ) for absorbance, molar concentration, molar absorptivity, or path length. Includes dilution factor (DF) and mass concentration (mg/L) conversions, absorbance A ⇄ percent transmittance %T, and least-squares calibration curve fitting for unknown sample quantification.

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Chemistry

Buffer Solution & Henderson-Hasselbalch Calculator

Calculate conjugate acid-base buffer recipes using the Henderson-Hasselbalch equation (pH = pKa + log([A⁻]/[HA])). Solves mass in grams for diverse hydrates, 1 M HCl/NaOH titration volumes, Good buffer temperature corrections (4°C, 25°C, 37°C), and Van Slyke buffer capacity β.

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Chemistry

Osmotic Pressure & Van 't Hoff Calculator

Calculate osmotic pressure (kPa, atm, mmHg), molarity, temperature, and van 't Hoff factor i using Π = iCRT. Simulates physiological saline / glucose RBC tonicity (hemolysis vs. crenation) and macromolecular molar mass determination by membrane osmometry.

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Chemistry

Electrochemistry, Nernst Equation & Faraday's Law Calculator

Calculate electrolysis mass, current, time, valence z, and STP gas volume via Faraday's Law (Q = It, m = MIt/(zF)), solve non-standard cell potentials and concentration cells with the Nernst equation (E = E° − (RT/nF)ln Q), and determine standard cell EMF E°cell, Gibbs free energy ΔG° = −nFE°, and equilibrium constant K with a 1-click toggle between textbook F = 96,500 C/mol and exact CODATA F = 96,485.33212 C/mol.

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Chemistry

Arrhenius Equation, Activation Energy & Reaction Rate Calculator

Solve the two-temperature Arrhenius equation (ln(k₂/k₁) = −(Ea/R)(1/T₂ − 1/T₁)) for activation energy Ea, rate constant k₂, or target temperature T₂, fit multi-point OLS Arrhenius plots (ln k vs. 1/T) with Eyring transition-state parameters (ΔH‡, ΔS‡, ΔG‡), and calculate 0th-, 1st-, and 2nd-order integrated rate laws (half-life t₁/₂, shelf-life t₉₀) with a 1-click toggle between exact CODATA R = 8.3144626 J/(mol·K) and textbook R = 8.31 J/(mol·K).

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Biology

Recombination Frequency Calculator

Work out recombination frequency from test-cross counts, an F2 [ab] proportion, or a gamete ratio. The tool identifies the parental and recombinant classes, distinguishes coupling from repulsion, and shows the working so you can check genetics problems step by step.

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Data Conversion & Generation

Hex & Text Converter

Convert Hex bytes and UTF-8 text in your browser. Inspect byte counts, Japanese characters and invalid UTF-8 without uploading data.

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Data Conversion & Generation

JSON Formatter

Format, minify, validate and unescape JSON right in your browser.

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Data Conversion & Generation

Base64 Converter

Encode or decode text, images and files to and from Base64.

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Data Conversion & Generation

UUID Generator

Generate UUIDs (v4) in bulk for free. Handy for API development and test data.

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Data Conversion & Generation

CSV to JSON Converter

Convert between CSV and JSON. Supports comma, tab and semicolon delimiters with optional header rows.

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Data Conversion & Generation

Number Base Converter

Convert between binary, octal, decimal and hexadecimal. Handles arbitrarily large integers with exact precision and readable digit grouping.

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Data Conversion & Generation

URL Encoder / Decoder

Encode text into URL (percent) encoding and decode it back. Handy for building Japanese URLs and query parameters or inspecting encoded strings.

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Data Conversion & Generation

Data Size Converter

Convert between bit, byte, KB, MB, GB, TB and PB. Switch between binary (1024) and decimal (1000) conventions to answer "how many MB in 1GB?" accurately.

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Data Conversion & Generation

Data Size & Transfer Time Calculator

Compute the data size of images, audio and video, and the time needed to transfer data — with both 1024-based and 1000-based unit conversions and the working shown. Useful for IT classwork and exam practice.

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Text Editing & Search

Text Converter

Convert case (lowercase, uppercase, title case) and clean up text: remove blank lines, trim spaces, and count characters, lines and UTF-8 bytes.

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Text Editing & Search

Kanji Number Converter

Convert between Arabic numerals and Kanji numerals (一, 十, 百, 千, 万).

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Text Editing & Search

Full-width / Half-width Converter

Convert between full-width and half-width characters. Handles letters, digits, symbols, spaces, and katakana with voiced marks.

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Text Editing & Search

Roman Numeral Converter

Convert between Arabic numerals and Roman numerals (I, V, X and more). Supports 1-3999 and tolerates non-standard forms like clock-face IIII.

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Text Editing & Search

Regex Tester

Test a regex pattern against any text and instantly see matches highlighted. Supports flags (g/i/m/s/u) and match details.

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Text Editing & Search

Text Diff / Compare

Compare two texts in your browser. See line-by-line additions and deletions side by side, with instant stats on what changed.

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Ciphers, Hashes & Passwords

Caesar Cipher & ROT13

Explore Caesar shifts and ROT13 with case-preserving letter conversion. Learn substitution with worked examples, entirely in your browser.

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Ciphers, Hashes & Passwords

XOR Calculator

Calculate XOR using Hex or UTF-8 input and a known repeating key. Inspect result bytes and text with this browser-based learning tool.

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Ciphers, Hashes & Passwords

Password Generator

Generate secure passwords for free. Customize length and character sets.

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Ciphers, Hashes & Passwords

Hash Generator

Compute SHA-1, SHA-256, SHA-384 or SHA-512 hashes of text or files in your browser. Handy for verifying file integrity and downloads.

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Images, Design & QR

Image Compressor

Compress image files and compare the result as you adjust quality and dimensions for websites or social media.

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Images, Design & QR

Image Converter

Convert between PNG, JPG, WebP and GIF. Preserve transparency or optimize to WebP.

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Images, Design & QR

QR Code Generator

Generate QR codes from URLs or text for free. Customize colors and sizes.

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Images, Design & QR

Color Converter

Convert between HEX, RGB and HSL. Pick colors directly with the color picker.

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Images, Design & QR

Color Palette Generator

Generate complementary, analogous, triadic and monochrome palettes. View HEX, RGB and HSL values and copy HEX codes for your designs.

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Images, Design & QR

Image Resizer

Resize images by pixels, percentage or longest side. Keep the aspect ratio and get the perfect size for websites, social media or document attachments.

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Images, Design & QR

QR Code Reader

Decode a QR code from an image — screenshots or photos — and copy the text. Everything is processed locally in your browser; nothing is uploaded.

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Images, Design & QR

Contrast Checker

Calculate the contrast ratio between text and background colors and check WCAG conformance (AA, AAA) instantly — for readable, accessible color combinations.

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Images, Design & QR

Image Cropper

Crop images right in your browser for free. Drag the frame, choose ratios like 1:1 or 16:9, and save as PNG, JPEG or WebP. No upload, no sign-up.

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Images, Design & QR

Image Merger

Combine multiple images into one — horizontally or vertically, with optional gaps. Save as PNG or JPEG. Everything runs locally in your browser.

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Images, Design & QR

Image Blur & Mosaic

Blur or pixelate parts of an image right in your browser. Drag over faces, names or addresses to hide them in screenshots and photos. Nothing is uploaded.

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Images, Design & QR

Image Background Transparency

Make the background of an image transparent in your browser. Click the color to remove and export a transparent PNG - ideal for logos and screenshots with solid backgrounds. Nothing is uploaded.

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Images, Design & QR

Image Rotate & Flip

Rotate images in 90° steps or flip them horizontally and vertically in your browser. Ideal for fixing phone photo orientation and creating mirrored images. Export as PNG, JPEG or WebP - nothing is uploaded.

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Images, Design & QR

Image Palette Extractor

Upload an image and extract its dominant colors as a palette. Choose 4, 6 or 8 colors and copy HEX or RGB codes with one click. Everything runs locally in your browser.

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PDF Editing

PDF Merge

Combine multiple PDF files into one. Reorder pages with simple drag and drop.

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PDF Editing

PDF Split

Split PDFs by page range, or extract specific pages into a new file.

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PDF Editing

Rotate PDF

Rotate PDF pages by 90 or 180 degrees and save the result for free. Process every page or a selected range locally in your browser without uploading the file.

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Dates & Time

Unix Timestamp Converter

Convert between Unix timestamps and dates. Grab the current timestamp with one click.

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Dates & Time

Date Calculator

Calculate the difference between two dates in days. Add or subtract days from any date.

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Dates & Time

Age Calculator

Calculate your exact age from your birth date, including days until your next birthday.

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Dates & Time

Timer & Stopwatch

Countdown timer and stopwatch right in your browser. Great for cooking, studying, workouts and timing.

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Dates & Time

Timezone Converter & World Clock

Compare current dates and times in Tokyo, New York, London and other cities, with each time difference measured from Tokyo.

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Dates & Time

Rokuyo Calendar & Lunar Date

Pick a date to instantly see its Rokuyo (Taian, Butsumetsu...), lunar date, Chinese zodiac and solar terms. Handy for choosing wedding, moving or opening dates.

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Dates & Time

Japanese Era (Wareki) Converter

Convert between Japanese era years (Meiji to Reiwa) and Gregorian years both ways. Era boundary dates are handled exactly - handy for filling in forms.

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Dates & Time

Time Duration Calculator

Find the duration between two times, or add and subtract hours and minutes. Times past midnight are handled automatically - great for work estimates.

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Calculations & Units

Discount Calculator

Calculate final price and savings for one or two percentage discounts. Stack 30% off with 10% off to see the true 37% effective discount.

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Calculations & Units

Tax Calculator

Calculate tax-included and tax-excluded prices with automatic tax amounts. Supports 10%, 8% and custom rates.

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Calculations & Units

Unit Converter

Convert length, weight and temperature instantly. Meters, inches, kilograms, pounds and more.

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Calculations & Units

Calculator

A free calculator that runs in your browser. Four basic operations, percentage, sign toggle and full keyboard support.

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Calculations & Units

Percentage Calculator

Three modes for instant percentage math: X% of a total, X as a % of Y, and increase or decrease by X%.

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Calculations & Units

Split Bill Calculator

Split a bill evenly from the total and number of people. Choose how to round the remainder - up, down, nearest, or the organizer pays the difference.

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Calculations & Units

Area & Volume Calculator

Calculate the area of 2D shapes (square, rectangle, triangle, circle) and the volume of 3D shapes (cube, cylinder, sphere). Any unit, with liter conversion.

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Calculations & Units

Loan Repayment Calculator

Calculate the monthly payment of a loan from the amount, rate and term, with total repayment and a year-by-year schedule for car, home or student loans.

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Calculations & Units

Compound Interest Calculator

See how savings grow with compound interest. Enter an initial amount, monthly contribution, rate and term to get the final value, total gain and a yearly table.

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Calculations & Units

Margin Calculator

Calculate profit, margin and markup from cost and selling price, or work backwards from a target margin to a price. Made for online shop sellers.

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Calculations & Units

Fuel Cost Calculator

Calculate the fuel needed and its cost from distance, efficiency and gas price, including the cost per kilometer. Handy for trips and expense reports.

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Calculations & Units

Electricity Cost & Energy Calculator

Turn power (W, or A × V) and usage time into energy in kWh and electricity cost per day, month and year. The rate is editable for your own tariff, and the tool converts between kWh, J, MJ and kcal.

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Notes

Browser Notepad

A free notepad that runs entirely in your browser. Your notes are saved automatically on your device and restored next time.

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Notes

Test Account Notes (Plain Text)

Save multiple accounts (title, username, password) for test environments and copy them in one click. Data stays in your browser and is never uploaded.

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Health Calculators

BMI Calculator

Calculate your BMI from height and weight, with the Japanese classification and healthy weight range.

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Health Calculators

Calorie & BMR Calculator

Estimate adult resting energy expenditure (REE) and daily expenditure using an activity factor. Explore the formula and assumptions; this is not a diet prescription.

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Random Picks & Games

Palindrome Checker

Check whether your text is a palindrome instantly. Supports hiragana, katakana and Latin letters.

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Random Picks & Games

Dice Roller

Roll any number of dice - 4-sided, 6-sided, 20-sided and more. A simple tool for fun and games.

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Random Picks & Games

Roulette Spinner

Spin a roulette to pick one item from your list. Great for choosing lunch or taking turns.

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Random Picks & Games

Daily Fortune

Check today's fortune from your birthday and blood type. Includes lucky item, lucky color and lucky number.

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Random Picks & Games

Reaction Time Test

Click the instant the screen turns green! Measure your reaction time 5 times and beat your record.

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Random Picks & Games

Number Guessing Game

Guess the secret number from 1 to 100. Use the hints to minimize your attempts and beat your record.

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Random Picks & Games

Random Number Generator

Generate random numbers in any range. Duplicate control and sorting included - ideal for draws and raffles.

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Random Picks & Games

Chinese Zodiac Finder

Instantly find the Chinese zodiac animal (Rat, Ox, Tiger...) for any Gregorian year, with a 12-year table around it — handy for New Year cards and trivia.

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Random Picks & Games

Typing Speed Test

Type the shown text and measure your typing speed, accuracy and misses. Three difficulty levels are included. Everything runs locally in your browser.

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