MultiFree Online Developer Tools
Fast, privacy-friendly utilities for web developers and site owners. 146+ tools — no sign-up required.
Browse All ToolsSecure .htaccess Generator
Generate Apache rewrite rules for HTTPS, WWW redirects, and clean URLs.
Open Tool →Robots.txt Generator
Create search-engine-friendly robots.txt crawler rules.
Open Tool →Meta Tag Generator
Build SEO meta tags, Open Graph, and Twitter Card markup.
Open Tool →HTML / JS Minifier
Compress HTML, CSS, and JavaScript to reduce file size.
Open Tool →CSS Minifier & Beautifier
Minify or beautify CSS stylesheets instantly.
Open Tool →JSON Formatter & Validator
Beautify JSON and catch syntax errors instantly.
Open Tool →Hash Generator (SHA-256)
Generate SHA-256, SHA-384, and SHA-512 hashes.
Open Tool →Base64 Encode / Decode
Convert text to Base64 and back instantly.
Open Tool →URL Encode / Decode
Percent-encode or decode URL strings.
Open Tool →Text Case Converter
Convert text between case styles like camelCase and snake_case.
Open Tool →Word & Character Counter
Count words, characters, sentences, and paragraphs.
Open Tool →Password Generator
Create strong random passwords with custom options.
Open Tool →UUID Generator
Generate RFC 4122 UUID v4 identifiers.
Open Tool →Unix Timestamp Converter
Convert Unix timestamps to dates and back.
Open Tool →HEX to RGB Color Converter
Convert HEX colors to RGB and HSL values.
Open Tool →Lorem Ipsum Generator
Generate placeholder text for design mockups.
Open Tool →XML Formatter
Beautify and indent XML documents for readability.
Open Tool →XML Minifier
Compress XML by removing whitespace and comments.
Open Tool →SQL Formatter
Format and indent SQL queries for readability.
Open Tool →HTML Beautifier
Format messy HTML with proper indentation.
Open Tool →JavaScript Beautifier
Format minified JavaScript into readable code.
Open Tool →YAML Formatter
Clean up and normalize YAML configuration files.
Open Tool →Markdown Formatter
Normalize spacing and structure in Markdown documents.
Open Tool →PHP Code Formatter
Basic PHP code indentation and cleanup.
Open Tool →TypeScript Formatter
Format TypeScript code with consistent indentation.
Open Tool →SCSS / SASS Formatter
Format SCSS and SASS stylesheet code.
Open Tool →GraphQL Query Formatter
Format GraphQL queries and mutations.
Open Tool →Dockerfile Formatter
Clean up Dockerfile instructions and spacing.
Open Tool →JavaScript Minifier
Minify JavaScript by removing whitespace and comments.
Open Tool →JSON Minifier
Compress JSON into a single line.
Open Tool →HTML Minifier
Remove whitespace from HTML documents.
Open Tool →SQL Minifier
Compress SQL queries to a single line.
Open Tool →SVG Minifier
Remove unnecessary whitespace from SVG files.
Open Tool →Hex Encoder
Convert text to hexadecimal representation.
Open Tool →Hex Decoder
Decode hexadecimal strings back to text.
Open Tool →Text to Binary
Convert text characters to binary (0 and 1).
Open Tool →Binary to Text
Decode binary strings back to readable text.
Open Tool →ASCII Code Converter
Convert characters to ASCII decimal codes and back.
Open Tool →Unicode Escape Encoder
Convert text to Unicode escape sequences (\uXXXX).
Open Tool →Unicode Escape Decoder
Decode \uXXXX Unicode escape sequences.
Open Tool →ROT13 Encoder / Decoder
Apply ROT13 cipher — encoding and decoding are the same operation.
Open Tool →HTML Entity Encoder
Encode special characters to HTML entities.
Open Tool →HTML Entity Decoder
Decode HTML entities back to plain text.
Open Tool →Base32 Encoder / Decoder
Encode or decode text using Base32 alphabet.
Open Tool →Punycode Converter
Convert internationalized domain names to Punycode (IDN).
Open Tool →MD5 Hash Generator
Generate MD5 hash digests from any text input.
Open Tool →SHA-1 Hash Generator
Generate SHA-1 hash digests from text.
Open Tool →SHA-256 Hash Generator
Generate SHA-256 cryptographic hash digests.
Open Tool →SHA-384 Hash Generator
Generate SHA-384 hash digests.
Open Tool →SHA-512 Hash Generator
Generate SHA-512 hash digests.
Open Tool →CRC32 Checksum Calculator
Calculate CRC32 checksum for data integrity verification.
Open Tool →HMAC SHA-256 Generator
Generate HMAC-SHA256 message authentication codes.
Open Tool →Reverse Text
Reverse the character order of any string.
Open Tool →URL Slug Generator
Convert titles to SEO-friendly URL slugs.
Open Tool →Remove Duplicate Lines
Remove duplicate lines from text while preserving order.
Open Tool →Sort Lines Alphabetically
Sort text lines A-Z or Z-A.
Open Tool →Trim Whitespace
Remove leading and trailing whitespace from each line.
Open Tool →Remove Empty Lines
Strip all blank lines from text.
Open Tool →Add Line Numbers
Prefix each line with its line number.
Open Tool →Remove Line Numbers
Strip line number prefixes from pasted code.
Open Tool →Extract Emails from Text
Find and extract all email addresses from text.
Open Tool →Extract URLs from Text
Find and extract all URLs from any text block.
Open Tool →Find and Replace Text
Search and replace strings in bulk text.
Open Tool →Line Counter
Count total lines, non-empty lines, and characters.
Open Tool →Character Frequency Analyzer
Analyze how often each character appears in text.
Open Tool →Text Diff Checker
Compare two text blocks and highlight differences.
Open Tool →Random String Generator
Generate random alphanumeric strings of custom length.
Open Tool →Random Number Generator
Generate random integers within a custom range.
Open Tool →Random Hex Generator
Generate random hexadecimal strings.
Open Tool →API Key Generator
Generate secure random API keys and secrets.
Open Tool →MAC Address Generator
Generate random MAC addresses for testing.
Open Tool →Cron Expression Generator
Build cron schedule expressions visually.
Open Tool →SemVer Version Generator
Generate semantic version numbers for software releases.
Open Tool →Fake JSON Data Generator
Generate sample JSON objects for API testing.
Open Tool →Gitignore Generator
Generate .gitignore files for your project stack.
Open Tool →Dockerignore Generator
Generate .dockerignore files for Docker builds.
Open Tool →.env File Generator
Generate .env configuration file templates.
Open Tool →Nonce Generator
Generate cryptographic nonces for security tokens.
Open Tool →Decimal to Binary
Convert decimal numbers to binary representation.
Open Tool →Binary to Decimal
Convert binary numbers to decimal.
Open Tool →Decimal to Hexadecimal
Convert decimal numbers to hex.
Open Tool →Hexadecimal to Decimal
Convert hex numbers to decimal.
Open Tool →Octal Converter
Convert between decimal and octal number systems.
Open Tool →Number Base Converter
Convert numbers between binary, octal, decimal, and hex.
Open Tool →Byte Size Converter
Convert between bytes, KB, MB, GB, and TB.
Open Tool →REM to PX Converter
Convert REM units to pixels for CSS.
Open Tool →PX to REM Converter
Convert pixel values to REM for CSS.
Open Tool →HSL to HEX Converter
Convert HSL color values to HEX and RGB.
Open Tool →RGB to HEX Converter
Convert RGB color values to HEX codes.
Open Tool →Timezone Converter
Convert dates and times between timezones.
Open Tool →Email Validator
Validate email address format instantly.
Open Tool →URL Validator
Check if a URL string is valid and well-formed.
Open Tool →JSON Validator
Validate JSON syntax without formatting.
Open Tool →XML Validator
Check if XML markup is well-formed and valid.
Open Tool →Regex Tester
Test regular expressions against sample text with live matches.
Open Tool →IPv4 Address Validator
Validate IPv4 address format and octet ranges.
Open Tool →IPv6 Address Validator
Validate IPv6 address format.
Open Tool →Credit Card Validator (Luhn)
Validate credit card numbers using the Luhn algorithm.
Open Tool →Password Strength Checker
Analyze password strength and get improvement tips.
Open Tool →JWT Decoder
Decode JSON Web Tokens and inspect header and payload.
Open Tool →JSON Diff Compare
Compare two JSON objects and find differences.
Open Tool →SemVer Version Compare
Compare two semantic version numbers.
Open Tool →CSV to JSON Converter
Convert CSV data to JSON arrays instantly.
Open Tool →JSON to CSV Converter
Convert JSON arrays to CSV format.
Open Tool →JSON to YAML Converter
Convert JSON objects to YAML format.
Open Tool →YAML to JSON Converter
Convert YAML configuration to JSON.
Open Tool →XML to JSON Converter
Convert XML documents to JSON objects.
Open Tool →JSON to XML Converter
Convert JSON objects to XML markup.
Open Tool →Markdown to HTML Converter
Convert Markdown syntax to HTML markup.
Open Tool →HTML to Markdown Converter
Convert HTML markup to Markdown syntax.
Open Tool →TSV to JSON Converter
Convert tab-separated values to JSON.
Open Tool →Query String Builder
Build URL query strings from key-value pairs.
Open Tool →JavaScript String Escaper
Escape special characters for JavaScript strings.
Open Tool →JavaScript String Unescaper
Unescape JavaScript escape sequences.
Open Tool →HTML String Escaper
Escape text for safe HTML insertion.
Open Tool →SQL String Escaper
Escape special characters for SQL queries.
Open Tool →Regex Special Character Escaper
Escape special regex characters in literal strings.
Open Tool →XML String Escaper
Escape special characters for XML content.
Open Tool →PHP Array to JSON
Convert PHP array syntax to JSON format.
Open Tool →String Length Calculator
Calculate byte length, character count, and UTF-8 size.
Open Tool →Levenshtein Distance Calculator
Calculate edit distance between two strings.
Open Tool →Palindrome Checker
Check if a string reads the same forwards and backwards.
Open Tool →IP to Long Integer
Convert IPv4 addresses to 32-bit long integers.
Open Tool →Long Integer to IP
Convert 32-bit integers back to IPv4 addresses.
Open Tool →Subnet Calculator
Calculate subnet mask, network address, and host range.
Open Tool →CIDR Range Calculator
Calculate IP range from CIDR notation.
Open Tool →User Agent Parser
Parse browser user agent strings into readable info.
Open Tool →MIME Type Lookup
Find MIME types by file extension and vice versa.
Open Tool →HTTP Status Code Lookup
Look up HTTP status code meanings and usage.
Open Tool →URL Parser
Break down URLs into protocol, host, path, and query components.
Open Tool →Caesar Cipher
Encrypt and decrypt text using Caesar cipher with custom shift.
Open Tool →Morse Code Translator
Convert text to Morse code and decode Morse back to text.
Open Tool →Bacon Cipher
Encode and decode text using Bacon's cipher (A/B).
Open Tool →Atbash Cipher
Apply the Atbash substitution cipher to text.
Open Tool →Vigenère Cipher
Encrypt and decrypt text with a keyword-based Vigenère cipher.
Open Tool →Hash Compare Tool
Compare two hash values for equality (timing-safe).
Open Tool →Password Entropy Calculator
Calculate password entropy in bits.
Open Tool →Constant-Time String Compare
Compare two strings without timing side-channels.
Open Tool →XML Sitemap Generator
Generate XML sitemap entries from a list of URLs.
Open Tool →Canonical Tag Generator
Generate canonical link tags for SEO.
Open Tool →Open Graph Tag Generator
Generate Open Graph meta tags for social sharing.
Open Tool →Twitter Card Generator
Generate Twitter Card meta tags for rich link previews.
Open Tool →Schema.org Markup Generator
Generate JSON-LD structured data for rich search results.
Open Tool →Hreflang Tag Generator
Generate hreflang tags for multilingual websites.
Open Tool →Robots Meta Tag Generator
Generate robots meta tags for index/noindex control.
Open Tool →Single URL Redirect Generator
Generate a single 301 redirect rule for .htaccess.
Open Tool →