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268+ free online tools for PDF, images, SEO, developers, color, and productivity. Fast, browser-based, and private — no signup, no installs, no limits. Search above or browse by category below.
Total tools26810.9K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
Inverse Matrix Calculator
Compute the inverse of a square matrix up to 6×6 using Gauss–Jordan elimination with verification.
Used 0 times•Updated never
Complex Number Calculator
Add, subtract, multiply, and divide complex numbers, find conjugate, modulus, argument, polar form, and integer powers with steps.
Used 0 times•Updated never
Factorization Calculator
Find the prime factorization of any integer, list all divisors, and see trial-division steps with copy-ready output.
Used 0 times•Updated never
Logarithm Calculator
Compute natural log (ln), common log (log₁₀), binary log (log₂), custom-base logarithms, and antilogs with change-of-base steps and verification.
Used 0 times•Updated never
Trigonometry Calculator
Compute sin, cos, tan, csc, sec, cot, and inverse trig functions in degrees or radians with exact values and step-by-step work.
Used 0 times•Updated never
Permutations Calculator
Calculate permutations nPr and factorials n! for ordered arrangements with formulas and step-by-step work.
Used 0 times•Updated never
Statistics Calculator
Compute mean, median, mode, standard deviation, variance, quartiles, range, and more from any dataset with step-by-step formulas.
Used 0 times•Updated never
Regression Calculator
Fit a linear regression line to (x, y) data — slope, intercept, equation, correlation r, R², and predictions with step-by-step work.
Used 0 times•Updated never
Z Score Calculator
Convert raw scores to z-scores and back using z = (x − μ) ÷ σ, with percentile and step-by-step work.
Used 0 times•Updated never
Mean Median Mode Calculator
Find the mean, median, and mode of any data set with frequency tables, sorted data, and step-by-step work.
Used 0 times•Updated never
Planet Weight Calculator
Find your weight on Mercury, Venus, Mars, Jupiter, the Moon, and other worlds. Enter Earth weight in kg or lb and compare surface gravity instantly. Free, browser-based.
Used 0 times•Updated never