免費線上工具
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 tools26810.7K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
RNA to Protein Translator
Translate RNA to protein with the standard genetic code — reading frames, AUG start, stop codons, and codon table. Free, instant, browser-based.
Used 0 times•Updated never
Codon Finder
Find codons in RNA or DNA — search AUG, stop codons, scan reading frames, and view codon frequencies. Free, instant, browser-based.
Used 0 times•Updated never
GC Content Calculator
Calculate GC content and base composition for DNA or RNA — percentages, counts, AT/GC ratio, and FASTA support. Free, instant, browser-based.
Used 0 times•Updated never
Melting Temperature Calculator
Calculate DNA primer melting temperature (Tm) — Wallace rule, salt-adjusted, and long-oligo formulas with adjustable Na⁺. Free, instant, browser-based.
Used 0 times•Updated never
Protein Molecular Weight Calculator
Calculate protein molecular weight from amino acid sequence — average mass in Da and kDa with composition breakdown. Free, instant, browser-based.
Used 0 times•Updated never
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 0 times•Updated never
Genetic Probability Calculator
Calculate offspring genotype and phenotype probabilities from Punnett squares — monohybrid and dihybrid crosses with instant results. Free, browser-based.
Used 0 times•Updated never
Punnett Square Generator
Generate Punnett squares for monohybrid and dihybrid crosses with custom trait names, parent labels, and genotype or phenotype ratios. Free, instant, browser-based.
Used 0 times•Updated never
Population Growth Calculator
Calculate population growth with exponential and logistic models — solve for N, growth rate r, time, or N₀ with projections and doubling time. Free, browser-based.
Used 0 times•Updated never
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 0 times•Updated never
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