Validators & Country Tools
Check numbers for typing mistakes with their check-digit rules: IBANs, card numbers, ISBNs and national ID formats. A valid check only means the number is well formed; it does not look anything up.
All tools
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Bearing Calculator
Initial and final bearing between two points, their midpoint, the point reached by a bearing and a distance, and the rhumb-line bearing and length.
Card Number Validator
Check a card number with the Luhn check digit and see its network from first digits, such as Visa or Mastercard. Runs in your browser and stores nothing.
Coordinate Converter
Convert a position between decimal degrees, degrees minutes seconds, UTM and MGRS. Type it in any form and get the zone, the band and the 100 km square.
Distance Between Coordinates
Distance between two points on Earth in km, miles and nautical miles, on a sphere and on the WGS 84 ellipsoid, with the starting bearing.
IBAN Validator
Check an IBAN for every country in the SWIFT registry: length, country structure and mod 97 check digits, with bank code and steps shown. Nothing is sent.
IMEI Validator
Check a 15-digit IMEI with the Luhn check digit from 3GPP TS 23.003. See the Type Allocation Code, the serial number and the working. Nothing is sent.
ISBN and Barcode Validator
Check an ISBN-10, ISBN-13, EAN-13, EAN-8, UPC-A or GTIN-14 check digit, convert ISBN-10 to ISBN-13, and see the GS1 prefix. Type is detected by length.
ISIN Validator
Check a 12-character ISIN: the country prefix, the nine-character national number and the check digit, with each step of the ESMA method. Nothing is sent.
Maidenhead Locator Converter
Turn latitude and longitude into a Maidenhead grid square of 4 or 6 characters, the IARU locator used in radio, and back to its centre. Nothing is sent.
Polygon Area on Earth
Area and perimeter of a polygon from its corners as latitude and longitude, in square metres, hectares, acres and dönüm, by spherical excess on the Earth.
Recent Earthquakes Worldwide
Earthquakes of magnitude 4.5 and up worldwide in the last 7 days, from the USGS feed. Times in Türkiye time; filter by area, period, magnitude and place.
SWIFT BIC Validator
Check a SWIFT or BIC code of 8 or 11 characters: institution, country, location and branch parts, and whether the country code is real. Nothing is sent.
VIN Decoder
Check a 17-character VIN: check digit (position 9), letters it cannot use, the number's parts and the two possible model years from position 10. No lookup.
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Numbers you check stay in your browser and are not stored.