Developer & Web Tools
Everyday developer utilities — Base64, hex, URL and HTML encoding, hash and UUID generation, JSON formatting, JWT decoding, regex testing and colour tools.
25 free tools · no sign-up, no adsAspect Ratio
Scale picture sizes and solve for missing proportions.
Math CalculatorBase Converter
Convert numbers between binary, octal, decimal, hex.
Math CalculatorBase64 Encode/Decode
Encode string values into Base64 format or decode them.
Developer CalculatorBase64Url Encode/Decode
URL-safe Base64 (RFC 4648) for tokens and query strings.
Developer CalculatorBinary to Decimal
Convert base-2 binary values to base-10 and vice-versa.
Math CalculatorCSS Gradient Generator
Design gradients visually and copy ready-to-use CSS.
Developer CalculatorCSV to JSON
Convert CSV data to JSON and back, with delimiters.
Developer CalculatorCase Converter
Switch text between camelCase, snake_case, and 7 more.
Developer CalculatorColor Converter
Convert colours between HEX, RGB, HSL, and CMYK formats.
Developer CalculatorData Transfer Converter
Convert data sizes and estimate bandwidth upload/download times.
Conversion CalculatorEpoch Converter
Convert Unix timestamps to calendar dates and vice-versa.
Conversion CalculatorFILETIME / pwdLastSet
Decode Active Directory FILETIME timestamps to dates.
Developer CalculatorHTML Entities
Escape and unescape HTML special characters.
Developer CalculatorHash Generator
Generate SHA-1, SHA-256, and SHA-512 hashes locally.
Developer CalculatorHex Encode/Decode
Convert text to hexadecimal and back, any layout.
Developer CalculatorJSON Formatter
Beautify, minify, and validate JSON data with clear errors.
Developer CalculatorJWT Decoder
Decode token headers, payloads and expiry.
Developer CalculatorLorem Ipsum Generator
Generate placeholder paragraphs, sentences, or words.
Developer CalculatorPassword Strength
Test password complexity and generate strong security keys.
Conversion CalculatorQuoted-Printable
Encode and decode RFC 2045 email-safe text.
Developer CalculatorRegex Tester
Test regular expressions with live match highlighting.
Developer CalculatorSAML Encode/Decode
Base64 and Deflate SAML payloads for POST and Redirect.
Developer CalculatorURL Encoder/Decoder
Safely percent-encode URLs or decode them back to text.
Developer CalculatorUTF-16 Encode/Decode
UTF-16 hex bytes, BOM and \uXXXX escapes.
Developer CalculatorUUID Generator
Create secure V4 and time-ordered V7 UUIDs in bulk.
Developer CalculatorExplore Other Categories
Climate & Sustainability Calculators
Carbon, energy, water & green living.
15 calculatorsUnit & Conversion Calculators
Units, currencies, time zones & measurements.
11 calculatorsDeveloper & Web Tools
Encoding, hashing, JSON, regex & web utilities.
25 calculatorsEducation & Student Calculators
Grades, GPA, percentage & study helpers.
16 calculatorsFinancial Calculators
Loans, investments, tax, salary & money planning.
37 calculatorsHealth & Fitness Calculators
BMI, calories, fitness, pregnancy & medication.
20 calculatorsMath Calculators
Numbers, algebra, geometry & everyday arithmetic.
26 calculators