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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 tools26810.8K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
Heart Rate Zone Calculator
Calculate heart rate training zones with Karvonen or % max HR — 3 or 5 zones from age, resting HR, and max HR formulas. Free, instant, browser-based.
Used 0 times•Updated never
BMR Calculator
Calculate basal metabolic rate (BMR) with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle — compare formulas and TDEE estimates. Free, instant, browser-based.
Used 0 times•Updated never
Blood Type Inheritance Calculator
Predict child blood types from parent ABO and Rh types — Punnett squares, probabilities, and combined outcomes like A+ or O−. Free, instant, browser-based.
Used 0 times•Updated never
Phylogenetic Tree Generator
Build phylogenetic trees from distance matrices, aligned DNA sequences (UPGMA), or Newick strings — SVG diagram, ASCII tree, and export. Free, browser-based.
Used 0 times•Updated never
Mutation Simulator
Simulate DNA/RNA mutations — substitutions, insertions, deletions, and seeded random SNPs with highlighted output and mutation log. Free, browser-based.
Used 0 times•Updated never
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.
Used 0 times•Updated never
Quadratic Equation Solver
Solve ax² + bx + c = 0 with the quadratic formula. Get roots, discriminant, vertex, and step-by-step work.
Used 0 times•Updated never
Polynomial Solver
Find roots of polynomials up to degree 6. Enter coefficients or an equation like x³ − 6x² + 11x − 6 = 0.
Used 0 times•Updated never
Derivative Calculator
Compute symbolic derivatives of functions with step-by-step rules. Supports polynomials, trig, ln, exp, and more.
Used 0 times•Updated never
Integral Calculator
Compute symbolic indefinite integrals with step-by-step rules. Supports polynomials, trig, exp, and 1/x.
Used 0 times•Updated never
Determinant Calculator
Calculate the determinant of a square matrix up to 6×6 with step-by-step cofactor work.
Used 0 times•Updated never