Free Online Tools
Free online tools for codes and text, run in your browser with nothing uploaded.
Codes
- QR Code GeneratorA free QR code generator for any text or link, made in your browser. Nothing is uploaded, nothing is shortened, and the code does not expire.
- Barcode GeneratorA barcode generator for UPC-A, EAN-13, EAN-8, Code 128 and Code 39, drawn as SVG in your browser, with the check digit worked out or verified.
- Base64 Decode and EncodeBase64 decode and encode in your browser, with UTF-8 text read correctly, either alphabet accepted, and the exact character named when the input is not valid Base64.
Networks and text
- Subnet CalculatorThe subnet calculator gives the network, broadcast, mask and usable host range for an IPv4 address and prefix, including /31 point-to-point links (RFC 3021) and single-host /32s.
- Lorem Ipsum GeneratorA lorem ipsum generator for placeholder text by paragraph, sentence, word or exact character count, built on the Cicero passage the words were scrambled out of.
More categories
- Math CalculatorsMath calculators that show their work: arithmetic, algebra, statistics, and a calculus calculator for derivatives and integrals, with exact answers in fractions and radicals where they exist.
- Geometry CalculatorsGeometry calculators for shapes, lines and angles, with the formula behind each answer explained.
- Chemistry Calculators, Physics and Lab ToolsChemistry calculators, physics calculators and molecular biology tools for the bench and the problem set.
- Conversion CalculatorsConversion calculators for unit conversion, number bases, Roman numerals and angles. The unit converter shows the factor it used and a conversion chart for the values around yours.
- Date and Time CalculatorsDate and time calculators for counting days, adding hours, converting time zones and reading other calendars.
- Business CalculatorsBusiness calculators for pricing a product and for the unit economics behind a company: margin, markup, break-even, ROI, CAC, LTV and churn.
- Random GeneratorsRandom generators that draw fairly, from your browser's cryptographic generator: numbers, names, teams, coin flips and dice.
- Everyday Cost CalculatorsCost calculators for what a meal, a drive or an appliance actually costs: tips, split bills, fuel, electricity and EV charging.