Gratis online tools
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 tools26810.8K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
Microscope Magnification Calculator
Calculate microscope total magnification, field of view from FN, and actual specimen size from image measurements — eyepiece × objective. Free, browser-based.
Used 0 times•Updated never
Equation Solver
Solve linear and quadratic equations step by step. Enter expressions like 2x + 3 = 7 or x^2 - 5x + 6 = 0.
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Quadratic Equation Solver
Solve ax² + bx + c = 0 with the quadratic formula. Get roots, discriminant, vertex, and step-by-step work.
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Polynomial Solver
Find roots of polynomials up to degree 6. Enter coefficients or an equation like x³ − 6x² + 11x − 6 = 0.
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Derivative Calculator
Compute symbolic derivatives of functions with step-by-step rules. Supports polynomials, trig, ln, exp, and more.
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Limit Calculator
Evaluate limits numerically with one- and two-sided approaches. Supports finite points and ±∞.
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Matrix Calculator
Add, subtract, multiply, transpose, invert, and find determinants of matrices up to 6×6.
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Determinant Calculator
Calculate the determinant of a square matrix up to 6×6 with step-by-step cofactor work.
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Inverse Matrix Calculator
Compute the inverse of a square matrix up to 6×6 using Gauss–Jordan elimination with verification.
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Vector Calculator
Compute 2D and 3D vector operations — add, subtract, dot product, cross product, magnitude, unit vector, angle, and projection — with steps.
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Complex Number Calculator
Add, subtract, multiply, and divide complex numbers, find conjugate, modulus, argument, polar form, and integer powers with steps.
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Prime Number Generator
Generate prime numbers in a range or list the first N primes using the Sieve of Eratosthenes with copy-ready output.
Used 0 times•Updated never