무료 온라인 도구
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
pH Calculator
pH calculator free — find pH, pOH, and ion concentrations from [H⁺], [OH⁻], or strong acid/base molarity. Instant, no signup.
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pOH Calculator
pOH calculator free — find pOH, pH, and [OH⁻] from hydroxide concentration or strong base molarity. Instant, no signup.
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Buffer Calculator
Buffer calculator free — Henderson-Hasselbalch pH for acid and base buffers. Solve pH, pKa, or concentrations. Instant, no signup.
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Percent Yield Calculator
Percent yield calculator free — find % yield, actual yield, or theoretical yield in grams or moles. Stoichiometry lab prep, no signup.
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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.
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Combined Gas Law Calculator
Combined gas law calculator free — solve P1V1/T1=P2V2/T2 for any unknown. Pressure, volume, temperature units. No signup.
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Reaction Stoichiometry Calculator
Reaction stoichiometry calculator free — moles and grams from a balanced equation and known amount. Auto-balance, no signup.
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Electron Configuration Generator
Electron configuration generator free — full and noble-gas notation for any element. Aufbau rules + exceptions. No signup.
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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.
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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.
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