OneTaskData and Code Converters
Number Base, Epoch, cURL, CSS Colour and Case Converters
The conversions developers, designers and analysts do between other jobs. Read a Unix timestamp, turn hex into binary, rewrite a cURL command as code, change a colour from hex to OKLCH, convert pixels to rem, reformat a key, or switch a coordinate from decimal degrees to degrees, minutes and seconds.
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Every Data & Code tool
BPM To Milliseconds Calculator
Tempo to delay times in ms and Hz for every note value, and back.
Base Converter
Convert numbers between binary, octal, decimal and hex.
CSS Colour Converter
Convert CSS colours between hex, rgb, hsl, hwb, lab, lch and oklch.
CSS Nesting Converter
Nest flat CSS with & or flatten nested CSS back into plain rules.
CURL Converter
Turn a curl command into code in 24 languages.
Case Converter
Seven case conversions, from shouted headline to variable name.
Coordinate Converter
Convert lat/lng between decimal, DMS and UTM on a map.
Date To Words Converter
Write any date out in words for invitations, cheques and documents.
Epoch Converter
Convert Unix timestamps to dates and back again.
GPX Converter
Convert GPX, KML and GeoJSON to each other or to CSV.
Hours To Minutes Converter
Convert between seconds, minutes, hours, days and weeks.
IP Range To CIDR Converter
Turn start and end IP addresses into the fewest CIDR blocks.
Jeans Size Converter
Turn waist and inseam measurements into W/L jeans sizes and conversions.
Modern CSS Units Converter
Convert ch, cap, lh, dvh, cqi and other modern CSS units to px.
Number To Words Converter
Numbers to English words and written numbers back to digits.
PEM To JWK Converter
Convert public and private keys between PEM and JWK.
Punycode Converter
Convert domains between Unicode and xn-- Punycode in both directions.
SSH Key Converter
Convert SSH public keys between OpenSSH, SSH2 and PEM formats.
Tailwind Colour Converter
Convert hex codes to the nearest Tailwind class, or Tailwind classes to hex.
Tailwind To CSS
Turn Tailwind utility classes into plain CSS declarations.
Unicode Converter
Convert text to and from code points, escapes, entities and UTF-8 bytes.
Viewport Unit Converter
Convert px to vw, vh, vmin, vmax and rem for any viewport size.
Numbers and time
The base converter moves between binary, octal, decimal and hexadecimal. The epoch converter turns Unix seconds or milliseconds into a readable date in your time zone and back. Other pages turn numbers and dates into words for cheques and documents, hours into minutes, and a tempo into milliseconds per beat for delay settings.
Front-end formats
Colour converters translate between hex, RGB, HSL, OKLCH and Tailwind palette names. CSS unit converters work out rem, em, viewport and container units from pixels, and the Tailwind and nesting converters rewrite stylesheet syntax so code moves between projects.
Keys, addresses and requests
PEM and JWK are two encodings of the same cryptographic key, and SSH keys come in several formats; these pages convert between them locally, so a private key never leaves your machine. Punycode turns international domain names into the ASCII form DNS uses, CIDR tools turn an IP range into blocks, and the cURL converter rewrites a request as fetch, Python or Go.
Maps and text
Coordinate and GPX converters handle the formats GPS units and mapping apps export. Text converters change case and inspect Unicode code points, the small jobs that otherwise need a script.
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