Reference & Learning
Quick, searchable references for the things you look up again and again: an interactive periodic table, country codes and flags, Unicode characters, HTML entities and ASCII codes, math symbols with LaTeX, keyboard shortcuts for every platform, and paper sizes and aspect ratios. All the data is built into the pages, so lookups are instant and private.
15 free tools · no sign-up · runs in your browser
All reference & learning
- Interactive Periodic TableExplore all 118 chemical elements and their properties.
- Country ExplorerCapitals, ISO codes, currencies, calling codes and more for every country.
- Flag ExplorerBrowse and search the flags of the world, then quiz yourself.
- Keyboard Shortcut ReferenceSearch shortcuts for Windows, macOS, Linux and every major browser.
- Unicode Character ExplorerSearch and inspect any Unicode character, block or code point.
- Math Symbols ReferenceCopy math symbols with their names, Unicode and LaTeX.
- Measurement ReferencePaper sizes, aspect ratios, resolutions, type units and social image sizes.
- Number Base ConverterBinary, octal, decimal and hex — any base 2–36.
- HTTP Status Code LookupEvery HTTP status code explained, with SEO notes.
- HTML Entity ReferenceSearch all 2,000+ named HTML entities and copy them.
- ASCII TableAll 128 ASCII codes in decimal, hex, octal, binary and HTML.
- Braille TranslatorConvert text to braille and braille back to text.
- Color Name ExplorerFind the name of any colour and browse 1,000+ named colours.
- Molar Mass CalculatorMolar mass and percent composition of any chemical formula.
- Roman Numeral ConverterNumbers to Roman numerals and back.