Code lookups
Resistor and capacitor markings, SMD codes, decoded instantly.
Morse code translatorTier 0Type words or paste dots and dashes; the translator figures out which way to go.Roman numeral converterTier 0Type a year like 2026 or numerals like MCMXCIV and get the conversion instantly.Resistor color codeTier 0Pick the band colours to read the resistance, tolerance and range — or type a value such as 470k or 4k7 to see which bands mark it. Colours follow IEC 60062:2016.NATO phonetic alphabetTier 0Type a name, a booking code or a serial number and get it spelled the way pilots and call centres do.Braille translatorTier 0See how words are written in braille cells, with capital and number indicators.Credit card validatorTier 0Catch typos in card numbers and test data with the same check-digit test that payment forms use.EAN-13 check digitTier 0Complete or verify the 13-digit barcode numbers used on retail products worldwide.UPC check digitTier 0Complete or verify the 12-digit barcodes used on products in the US and Canada.IBAN validatorTier 0Catch typos in an IBAN before you send a transfer or save supplier details.SMD resistor codeTier 0Type the code printed on a surface-mount resistor and read its value in ohms.Capacitor codeTier 0Type the code printed on a small capacitor and read its capacitance in every unit.ISBN validatorTier 0Paste an ISBN from a book, catalogue or spreadsheet to check it and get both formats.