💻 Web & Developer Tools Calculators

Encoders, formatters, converters and utilities for developers. — 36 free tools.

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Base64 Encode

Encode text to Base64.

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Base64 Decode

Decode Base64 back to text.

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URL Encode

Percent-encode text for safe use in URLs.

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URL Decode

Decode percent-encoded URL text.

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HTML Encode

Escape HTML special characters.

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HTML Decode

Decode HTML entities back to characters.

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JSON Validator

Check whether text is valid JSON.

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JSON Minifier

Compress JSON by removing whitespace.

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JSON Beautifier

Pretty-print JSON with indentation.

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CSV to JSON

Convert CSV (with header row) to JSON.

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JSON to CSV

Convert an array of JSON objects to CSV.

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JWT Decoder

Decode the header and payload of a JWT (no verification).

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Unix Timestamp to Date

Convert a Unix timestamp to a human date.

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Date to Unix Timestamp

Convert a date to a Unix timestamp.

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Regex Tester

Test a regular expression against sample text.

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CSS Minifier

Minify CSS by removing comments and whitespace.

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Number to Words

Convert a number into English words.

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Binary to Decimal

Convert a binary number to decimal.

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Decimal to Binary

Convert a decimal number to binary.

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Decimal to Hex

Convert a decimal number to hexadecimal.

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Hex to Decimal

Convert a hexadecimal number to decimal.

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Decimal to Octal

Convert a decimal number to octal.

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Octal to Decimal

Convert an octal number to decimal.

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Binary to Hex

Convert a binary number to hexadecimal.

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Hex to Binary

Convert a hexadecimal number to binary.

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Query String Parser

Parse a URL query string into key/value pairs.

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UTM Campaign URL Builder

Build a tracking URL with UTM parameters.

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HTTP Status Code Lookup

Look up the meaning of an HTTP status code.

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MIME Type Lookup

Find the MIME type for a file extension.

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Password Entropy Calculator

Estimate the entropy and strength of a password.

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Text Diff Checker

Compare two texts line by line.

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snake_case Converter

Convert text to snake_case.

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camelCase Converter

Convert text to camelCase.

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kebab-case Converter

Convert text to kebab-case.

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Strip HTML Tags

Remove all HTML tags, leaving plain text.

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String Hash (djb2)

Compute a fast non-cryptographic djb2 hash of text.