Ferramentas online gratuitas
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
DNA Reverse Complement
Get the reverse complement of a DNA or RNA sequence — A↔T/U, G↔C with GC content and FASTA support. Free, instant, browser-based.
Used 1 times•Updated 44 minutes ago
Restriction Enzyme Finder
Find restriction enzyme cut sites in DNA — EcoRI, BamHI, HindIII, and 30+ common enzymes with cut positions. Free, instant, browser-based.
Used 1 times•Updated 37 minutes ago
Genetic Probability Calculator
Calculate offspring genotype and phenotype probabilities from Punnett squares — monohybrid and dihybrid crosses with instant results. Free, browser-based.
Used 1 times•Updated 30 minutes ago
Cell Division Calculator
Calculate cell count after binary fission — solve for N, N₀, divisions, generation time, or elapsed time with step-by-step growth table. Free, browser-based.
Used 1 times•Updated 30 minutes ago
Limit Calculator
Evaluate limits numerically with one- and two-sided approaches. Supports finite points and ±∞.
Used 1 times•Updated 5 minutes ago
Vector Calculator
Compute 2D and 3D vector operations — add, subtract, dot product, cross product, magnitude, unit vector, angle, and projection — with steps.
Used 1 times•Updated 29 minutes ago
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 1 times•Updated 31 minutes ago
LCM Calculator
Find the least common multiple (LCM) and GCD of two or more positive integers with prime-factor and step-by-step GCD methods.
Used 1 times•Updated 20 minutes ago
GCD Calculator
Find the greatest common divisor (GCD) and LCM of two or more positive integers with Euclidean algorithm steps and prime-factor method.
Used 1 times•Updated 35 minutes ago
Probability Calculator
Calculate basic, complement, union, intersection, conditional, and binomial probabilities with formulas and step-by-step work.
Used 1 times•Updated 31 minutes ago
Combinations Calculator
Calculate combinations nCr and permutations nPr with factorial formulas, step-by-step work, and support for large results.
Used 1 times•Updated 39 minutes ago
Standard Deviation Calculator
Calculate sample and population standard deviation and variance from any data set with squared-deviation steps.
Used 1 times•Updated 43 minutes ago