Free Online Tools
184+ 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 collection below.
Total tools18410.7K total uses
Categories11Active categories
Most usedJSON Formatter4.1K uses
Recently addedElectron Configuration GeneratorNewest tool
Boyle's Law Calculator
Boyle's law calculator free — solve P1V1=P2V2 for pressure or volume at constant temperature. atm, kPa, L, mL. No signup.
Used 0 times•Updated never
Charles' Law Calculator
Charles' law calculator free — solve V1/T1=V2/T2 for volume or temperature at constant pressure. K, °C, L, mL. No signup.
Used 0 times•Updated never
Combined Gas Law Calculator
Combined gas law calculator free — solve P1V1/T1=P2V2/T2 for any unknown. Pressure, volume, temperature units. No signup.
Used 0 times•Updated never
Reaction Stoichiometry Calculator
Reaction stoichiometry calculator free — moles and grams from a balanced equation and known amount. Auto-balance, no signup.
Used 0 times•Updated never
Atomic Mass Calculator
Atomic mass calculator free — IUPAC element lookup or weighted isotope average. Atomic number and u/g/mol. No signup.
Used 0 times•Updated never
Electron Configuration Generator
Electron configuration generator free — full and noble-gas notation for any element. Aufbau rules + exceptions. No signup.
Used 0 times•Updated never
Periodic Table Explorer
Interactive periodic table with element details, atomic mass, and electron configuration for all 118 elements.
Used 0 times•Updated never
Oxidation Number Calculator
Find oxidation numbers in chemical formulas using standard rules — H2SO4, KMnO4, NH3, and polyatomic ions. Free, instant, browser-based.
Used 0 times•Updated never
Half-Life Calculator
Calculate radioactive decay with half-life — remaining amount, elapsed time, or half-life from N = N₀(½)^(t/t½). Free, instant, browser-based.
Used 0 times•Updated never
Chemical Name Generator
Convert chemical formulas to names and names to formulas — ionic compounds, acids, hydrates, and common molecules. Free, instant, browser-based.
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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 0 times•Updated never
DNA to RNA Converter
Convert DNA to RNA — replace T with U on the coding strand, or transcribe from the template strand. FASTA support. Free, instant, browser-based.
Used 0 times•Updated never