Tool Directory
Explore 126+ Free Online Tools
Browse every formatter, converter, encoder, validator, and generator available on FreeFormatHub. All tools run locally in your browser for instant, private results.
Tip: open a JSON formatter to make payloads readable, use an XML formatter for sitemap or SOAP, or a Base64 encoder during API debugging โ all clientโside for privacy.
Data Formatters & Validators
Format, validate, and beautify data in various formats
Data Converters
Convert data between different formats and structures
Encoding & Decoding
Encode and decode text in various formats
Text & String Tools
Manipulate and transform text and strings
Cryptography & Security
Hash, encrypt, and secure your data
Web Development
Tools for frontend and backend development
Color & Design
Work with colors, gradients, and design elements
Date & Time
Convert and calculate dates, times, and timezones
Number & Math
Mathematical calculations and number conversions
Network & API
Network utilities and API development tools
Generators & Creators
Generate content, data, and code automatically
Development Tools
Tools for software development and coding
Data Analysis
Analyze and process data files and content
Data Validators
Validate data formats, contacts, and input fields
Data Formatters & Validators
Format, validate, and beautify data in various formats
JSON Tools
3 toolsFormat, validate, and beautify JSON data
JSON Formatter & Validator
Turn that wall of unreadable JSON into something a human can actually parse. This tool catches the usual suspects: missing quotes, trailing commas, weird Unicode characters that break everything. Works with regular JSON and JSONC (the one with comments). Your API responses become readable, your config files make sense, and you stop wondering why that POST request keeps failing. Tip from practice: I start with a JSON validator and JSON formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
YAML Formatter & Validator
Format, validate, and convert YAML data with syntax checking, JSON conversion, and beautification options. Tip from practice: I start with a JSON validator and JSON formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
CSV Formatter & Validator
Format, validate, and convert CSV data with support for different delimiters, data type detection, sorting, filtering, and conversion to JSON or table format. Tip from practice: I start with a CSV formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
XML Tools
1 toolsFormat, validate, and process XML documents
CSS Tools
1 toolsFormat, minify, and optimize CSS stylesheets
Code Formatters
3 toolsFormat and beautify various programming languages
HTML Prettier Online - Beautifier & Formatter
Format HTML code with prettier-style beautification online. Free HTML formatter with intelligent indentation, attribute sorting, validation, and minification โ all in your browser.
JavaScript Beautifier & Minifier
Format, beautify, and minify JavaScript code with proper indentation, syntax validation, and optimization. Supports ES6+, JSX, and modern JavaScript features with comprehensive formatting options.
SQL Formatter & Beautifier
Format, beautify, and minify SQL queries with proper indentation, keyword formatting, and syntax validation. Supports multiple SQL dialects with comprehensive formatting options. Tip from practice: I start with an SQL formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
Data Converters
Convert data between different formats and structures
Data Formats
6 toolsConvert between JSON, CSV, XML, YAML, and other data formats
JSON to CSV Converter - Get Table Data from JSON
Get structured table data from JSON instantly! Extract JSON array elements and convert to CSV/Excel format. Perfect for getting spreadsheet data from API responses, databases, and JSON files.
CSV to JSON Converter
Convert CSV (Comma Separated Values) files to JSON format with advanced parsing options, data type detection, and flexible output structures.
JSON to XML Converter
Convert JSON data to well-formed XML with customizable formatting, attribute handling, namespace support, and structure validation. Tip from practice: I start with a JSON formatter and XML formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
XML to JSON Converter
Convert XML to JSON format with xml extract and xml get functionality. Parse any XML file format, xml search elements, with customizable parsing options and namespace support. Tip from practice: I start with a JSON formatter and XML formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
Data Format Transformer
Transform data between multiple formats including JSON, YAML, CSV, XML, TOML, INI, and Properties with structure preservation and advanced options. Tip from practice: I start with a JSON formatter and XML formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
Currency Converter
USD currency converter and dollar currency exchange with live ECB rates. Convert USD to EUR and 30+ currencies, euro convert calculator with historical charts, and comparison tools for international money conversion.
Images & Media
3 toolsConvert image formats, resize, and optimize media files
Image Format Converter
Convert images between different formats (PNG, JPEG, WebP, BMP, GIF) with compression, resizing, and optimization options. Process images entirely in your browser.
WebP Image Converter
Convert images to and from WebP format with advanced compression settings, quality optimization, and detailed conversion metrics. Supports JPEG, PNG, GIF, BMP input with lossless and lossy modes.
Image to Base64 Converter
Convert images to Base64 encoding for embedding directly in HTML, CSS, or applications. Supports multiple formats with compression and resizing options. Tip from practice: I start with a Base64 encoder and URL encoder to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
Colors & Design
1 toolsConvert between color formats: HEX, RGB, HSL, and more
Numbers & Units
2 toolsConvert number bases, units, and measurements
Unit Converter
Professional unit converter and measurement calculator supporting length (meters, feet, inches, miles, km), weight/mass (kg, pounds, ounces, grams), temperature (Celsius, Fahrenheit, Kelvin), volume (liters, gallons, cups), area, time, and digital storage conversions. Convert between metric, imperial, and scientific measurement systems with precision formulas.
Number Base Converter
Convert numbers between different bases (binary, octal, decimal, hexadecimal, and more). Supports bases 2-36 with validation, digit grouping, and batch processing.
Code & Development
2 toolsConvert between code formats and generate type definitions
JSON to TypeScript Interface - Get Types from JSON Data
Get TypeScript interfaces from JSON data instantly! Extract type definitions, parse nested objects, and generate clean TypeScript code. Perfect for getting strongly-typed interfaces from API responses and JSON files.
CSS to Tailwind Converter
Convert traditional CSS styles to Tailwind CSS utility classes with support for responsive variants, interactive states, and multiple output formats.
Document Formats
2 toolsConvert between document formats and markup languages
Markdown โ HTML Converter
Convert Markdown to HTML or go the other way around. Handles the usual stuff like tables, task lists, code blocks, and keeps formatting intact when converting back and forth.
Data URI Converter
Convert text, images, and other content to/from Data URIs for inline embedding in HTML, CSS, and JavaScript. Tip from practice: I start with a Base64 encoder and Base64 decoder to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
Other Data Converters
4 toolsURL to Markdown Converter
Convert any webpage to clean Markdown format. Perfect for documentation, saving articles, or preparing content for AI tools like Claude and GPT-4. Supports standard human-readable format and AI-optimized structured format for better LLM comprehension. Tip from practice: I start with an HTML formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
PDF Text Extractor - Extract Text from PDF Online
Free online PDF text extractor that safely extracts text content from PDF documents in your browser. No files uploaded to servers, works offline, supports metadata extraction, and handles large PDF files up to 50MB.
Excel to JSON Converter - Convert XLSX XLS to JSON Online
Free online Excel to JSON converter that safely converts Excel spreadsheets (.xlsx, .xls) to JSON format in your browser. No files uploaded to servers, works offline, supports multiple sheets and custom formatting options.
JSON to Excel Converter - Convert JSON to XLSX CSV Online
Free online JSON to Excel converter that safely converts JSON data to Excel spreadsheets (.xlsx) or CSV format in your browser. No files uploaded to servers, works offline, supports nested object flattening and custom formatting options.
Encoding & Decoding
Encode and decode text in various formats
Base Encoding
4 toolsBase64, Base32, and other base encoding/decoding
Base64 Encoder & Decoder
Need to encode binary data for an API, or decode that mysterious Base64 string someone sent you? This tool handles both directions. Supports regular and URL-safe encoding (the kind that will not break when used in URLs). Drop in files, text, whatever - it just works. Tip from practice: I start with a Base64 encoder and Base64 decoder to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
Base32 Encoder/Decoder
Encode and decode text using Base32 with support for multiple variants and formatting options
Base64 Image Encoder
Convert images to Base64 data URIs for embedding in HTML, CSS, or emails Tip from practice: I start with a Base64 encoder to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
Base64 to Image Converter
Decode base64 encoded strings back to images. Extract images from data URLs, HTML, or CSS. Preview decoded images and download in original format. Tip from practice: I start with a Base64 decoder and URL decoder to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
URL & Web
3 toolsURL encoding, HTML entities, and web-safe encoding
URL Encoder & Decoder
Stop debugging broken URLs because of unescaped spaces and special characters. This tool properly encodes URLs and query parameters so they actually work in browsers and APIs. Handles the space encoding choice (+ vs %20) and knows the difference between full URLs and URL components. Tip from practice: I start with a URL encoder and URL decoder to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
HTML Entity Encoder
Encode text to HTML entities using named, numeric, hexadecimal, or smart encoding modes
HTML Entity Decoder
Decode HTML entities into readable text characters, supporting named entities, numeric codes, and hexadecimal values with comprehensive validation.
Text & Strings
2 toolsString escaping, character encoding, and text transformation
String Escape & Unescape
Escape and unescape strings for various programming languages and formats including JavaScript, JSON, HTML, XML, CSS, SQL, RegEx, URL, CSV, and Python.
Emoji Converter
Convert between emoji formats, analyze emoji usage, and search emoji database
Cryptographic
2 toolsJWT decoding, certificate parsing, and crypto formats
JWT Decoder & Validator
Need to sanityโcheck an auth issue quickly? This JWT decoder unpacks header and payload instantly so you can confirm alg, iss, aud, exp, and custom claims. Decode tokens safely inโbrowser, view raw segments or pretty JSON, and use the JWT validator hints to spot expired or malformed tokens without sharing secrets. Tip from practice: I start with a JSON validator to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
SSL/TLS Certificate Decoder
Decode and analyze SSL/TLS X.509 certificates. Extract detailed information including subject, issuer, validity, public key, extensions, and perform security analysis.
Text & String Tools
Manipulate and transform text and strings
Text Transform
1 toolsChange text case, format, and structure
Text Analysis
3 toolsAnalyze text statistics, readability, and content metrics
Word Counter & Character Counter - Text Statistics Calculator
Professional word counter and character counter tool that provides instant text statistics including word count, character count, sentence count, paragraph count, readability scores, and detailed text analysis for any document or content.
Word Counter - Free Online Word & Character Counter
Free online word counter and character counter tool that instantly counts words, characters (with and without spaces), sentences, paragraphs, and provides reading time estimates. Perfect for essays, articles, social media posts, and any text content.
Advanced Text Analytics
Comprehensive text analysis providing sentiment analysis, readability scores, keyword extraction, entity recognition, language detection, tone analysis, and detailed content statistics.
Text Comparison
2 toolsCompare text, find differences, and merge content
Text Diff & Compare
Compare two pieces of text and highlight differences with line-by-line, word-by-word, or character-by-character comparison.
Diff Checker
Compare two texts or code files to identify differences. Generate professional diff outputs in multiple formats with detailed statistics and analysis.
Text Generation
4 toolsGenerate Lorem Ipsum, placeholder text, and content
Lorem Ipsum Generator
Generate Lorem Ipsum and placeholder text for your design and development needs. Multiple languages and formats with customizable options.
Lorem Ipsum Generator
Generate placeholder text in various styles including classic Lorem Ipsum, modern business text, hipster phrases, and pirate speak for design and development mockups.
Markdown Table Generator
Convert CSV, JSON, TSV, or manual data into beautifully formatted markdown tables. Support for sorting, alignment, and customization options. Tip from practice: I start with a JSON formatter and CSV formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
ASCII Art Generator
Generate beautiful ASCII art from text with multiple fonts, styles, and customization options including alignment, spacing, and effects
Regex & Patterns
2 toolsTest regular expressions and analyze text patterns
Regular Expression Tester
Debug regular expressions with real-time execution, capture group analysis, replacer previews, split testing, and pattern breakdowns across all JavaScript regex features.
Regex Pattern Analyzer
Comprehensive regex pattern analyzer with explanation, testing, match extraction, and performance analysis capabilities.
Other Text & String Tools
3 toolsLine Deduplicator - Remove Duplicate Lines from Text Online
Free online line deduplicator that removes duplicate lines from text data while preserving formatting and order. Perfect for cleaning up lists, logs, data files, and text documents with advanced sorting and filtering options.
Text Find & Replace - Search and Replace Text Online
Free online text find and replace tool that searches and replaces text patterns with advanced options. Supports regular expressions, case sensitivity, whole word matching, and detailed statistics for efficient text processing.
List Sorter - Sort Lists Online Alphabetically or Numerically
Free online list sorting tool that organizes text lists alphabetically, numerically, by length, or randomly. Features advanced options like duplicate removal, article ignoring, and natural sorting for efficient list management.
Cryptography & Security
Hash, encrypt, and secure your data
Hash Generation
1 toolsGenerate MD5, SHA-1, SHA-256, and other hash algorithms
Password Tools
3 toolsGenerate secure passwords and check password strength
Password Generator
Generate cryptographically strong passwords with custom length, character sets, exclusion rules, entropy estimates, and bulk export โ all processed locally.
Password Strength Checker
Analyze password strength and security with comprehensive checks for common vulnerabilities, patterns, and entropy calculation. Get detailed improvement suggestions.
Password Policy Generator
Generate comprehensive password policies with compliance standards, validation rules, and implementation guides for different organizational needs
Encryption & Security
3 toolsEncrypt, decrypt, and secure sensitive data
Encryption & Decryption Tool
Encrypt and decrypt text using industry-standard algorithms like AES. Generate secure keys, protect sensitive data, and learn about cryptography.
JWT Generator
Generate JSON Web Token (JWT) with custom claims, authentication tokens, and jwt token creation using HMAC, RSA, and ECDSA signing algorithms for secure oauth and API authentication. Tip from practice: I start with a JWT generator to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
Encryption Key Generator
Generate cryptographically secure encryption keys for JWT secrets, API keys, database encryption, and environment variables. Supports multiple formats and key sizes. Tip from practice: I start with a JWT generator to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
Data Integrity
1 toolsVerify file integrity and data authenticity
Web Development
Tools for frontend and backend development
HTML Tools
1 toolsBeautify, minify, and validate HTML documents
CSS Tools
3 toolsCSS optimization, minification, and selector generation
CSS Minifier
Minify and compress CSS code by removing whitespace, comments, and optimizing properties for smaller file sizes.
CSS Selector Generator
Generate precise CSS selectors for targeting HTML elements. Support for classes, IDs, attributes, pseudo-classes, and complex combinators.
CSS Grid Generator
Generate CSS Grid layouts with visual editor, responsive breakpoints, named areas, and custom positioning. Create complex grid systems with HTML and CSS code generation.
JavaScript Tools
1 toolsMinify, beautify, and optimize JavaScript code
API Development
8 toolsAPI testing, documentation, and response formatting
API Request Builder
Build and generate API requests in multiple formats. Support for cURL, JavaScript Fetch, Axios, and Postman collections with authentication and custom headers.
API Response Formatter
Format, validate, and analyze API responses including JSON, XML, and raw HTTP responses with headers, status codes, and performance metrics. Tip from practice: I start with a JSON validator and JSON formatter to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
API Documentation Generator
Generate comprehensive API documentation from OpenAPI/Swagger specifications, Postman collections, or manual input. Create beautiful, interactive documentation with code examples, schemas, and testing capabilities.
Webhook Testing Tool
Comprehensive webhook testing with multiple scenarios, authentication, performance analysis, and security validation
HTTP Status Code Reference
Complete HTTP status code reference guide with detailed descriptions, usage examples, RFC references, and practical guidance for web developers and API designers.
User Agent Parser
Parse and analyze user agent strings to extract detailed information about browsers, operating systems, devices, and detect bots and crawlers.
URL Parser & Analyzer
Parse and analyze URLs to extract all components including protocol, hostname, path, query parameters, fragments, with security analysis and validation features.
URL Shortener
Create custom short URLs with advanced features like analytics tracking, password protection, expiration dates, geographic restrictions, and QR code generation.
Web Security
1 toolsAnalyze security headers and web application security
SVG & Graphics
2 toolsOptimize SVG files and work with vector graphics
SVG Optimizer
Optimize and compress SVG files by removing unnecessary elements, attributes, and metadata. Advanced cleaning options to reduce file size while preserving visual quality.
SVG Editor
Edit, optimize, validate, and manipulate SVG files with comprehensive tools
Other Web Development
1 toolsColor & Design
Work with colors, gradients, and design elements
Palette Generation
1 toolsGenerate color palettes and schemes
Color Accessibility
1 toolsTest color contrast and accessibility compliance
Date & Time
Convert and calculate dates, times, and timezones
Timestamp Tools
2 toolsConvert and format Unix timestamps
Timestamp Converter
Convert between different timestamp formats including Unix timestamps, ISO dates, and human-readable formats. Supports timezone conversion, relative time display, and batch processing.
Timestamp Formatter
Convert and format timestamps between different formats including Unix, ISO 8601, and RFC 2822 with timezone support and relative time calculation.
Timezone Tools
1 toolsConvert between timezones and handle timezone data
Cron & Scheduling
1 toolsGenerate and validate cron expressions
Time Conversion
1 toolsConvert between time formats and decimal hours
Number & Math
Mathematical calculations and number conversions
Network & API
Network utilities and API development tools
IP & Networking
2 toolsIP calculations, subnet tools, and network utilities
IP Subnet Calculator - Netmask & CIDR Calculator
Calculate IP subnets, netmasks, CIDR notation, and find first/last usable IP addresses. Complete network calculator with subnet splitting and binary analysis for network engineers.
First Usable IP Address Calculator - IP Range Tool
Find the first and last usable IP addresses in any subnet or network range. Perfect for DHCP configuration, network planning, and IP address management tasks.
DNS & Lookup
2 toolsDNS lookup, WHOIS, and domain information tools
DNS Lookup Tool
Query DNS records for domain names using multiple public DNS servers. Supports all common record types including A, AAAA, CNAME, MX, TXT, NS, and SOA records.
Whois Lookup
Look up detailed information about domain names and IP addresses including registration details, contact information, DNS records, and network data.
Port & Security
1 toolsPort scanning and network security testing
Network Monitoring
1 toolsMonitor network performance and connectivity
Rate Limiting
1 toolsCalculate and configure API rate limits
Generators & Creators
Generate content, data, and code automatically
QR & Barcodes
3 toolsGenerate QR codes and barcodes
QR Code Generator
Generate custom QR codes with advanced styling options, error correction levels, logo embedding, and multiple download formats for any text or data.
QR Code Generator
Generate custom QR codes for URLs, text, contact information, WiFi credentials, and more. Customize colors, add logos, choose styles, and download in multiple formats.
Barcode Generator
Generate barcodes in various formats including Code 128, Code 39, EAN-13, UPC, and more with customizable styling, validation, and multiple output formats.
Other Generators & Creators
2 toolsUUID/GUID Generator
Generate UUID/GUID identifiers in v1, v4, v7, or nil form with timestamp annotations, bulk output, and flexible formatting options.
Mock Data Generator
Generate realistic mock data for testing, development, and prototyping. Create users, products, orders, addresses, or custom data structures in multiple formats.
Development Tools
Tools for software development and coding
JSON Tools
2 toolsJSON processing, validation, and manipulation tools
JSON Flattener
Flatten nested JSON objects to flat key-value pairs or unflatten back to nested structure with customizable delimiters and array handling
JSON Path Extractor - Get, Search & Extract Values from JSON
Get specific values from JSON data instantly! Search through nested objects, extract array elements, and retrieve data using powerful JSONPath expressions. Perfect for getting exactly what you need from complex JSON structures.
Database Tools
3 toolsDatabase query optimization and schema tools
SQL Query Builder
Build and format SQL queries with an intuitive interface. Support for multiple database systems and query types with syntax validation and optimization suggestions.
Database Schema Visualizer
Visualize database schemas with interactive ERD diagrams, analyze table relationships, detect normalization issues, and generate performance and security recommendations.
Database Query Optimizer
Analyze and optimize SQL queries with performance suggestions, index recommendations, and database-specific best practices
Configuration
2 toolsValidate and manage configuration files
Configuration File Validator
Comprehensive validation for configuration files including JSON, YAML, TOML, XML, Dockerfile, Nginx, Apache configs with syntax, security, and best practices checking
Validate YAML - YAML Validator & Syntax Checker
Validate YAML syntax online with comprehensive error checking, indentation validation, and structure analysis. Free YAML validator for configuration files, Docker Compose, Kubernetes manifests, and more.
Version Control
1 toolsGit diff visualization and version control tools
Other Development Tools
6 toolsLoad Testing Configuration Generator
Generate comprehensive load testing configurations for popular frameworks like K6, JMeter, Artillery, Locust, and more
Performance Budget Calculator
Calculate comprehensive performance budgets for web applications with Core Web Vitals, resource limits, and framework-specific optimization guidance
Log Analysis Tool
Comprehensive log file analysis with security, performance, and traffic insights for Apache, Nginx, and other web server logs
CLI Commands Reference
Searchable command-line reference covering Linux, macOS, Windows, PowerShell, Docker, and Git with syntax, flags, and safety tips
AI CLI Assistant
Authoritative AI CLI reference covering Claude Code, Ollama, OpenAI, Vertex AI Gemini, Cursor, GitHub Copilot, and aider with syntax, flags, and safety notes.
Emoji Reference
Comprehensive emoji reference with Unicode values, HTML codes, CSS codes, and shortcodes for developers and content creators
Data Analysis
Analyze and process data files and content
File Analysis
1 toolsAnalyze file content, metadata, and structure
Binary & Hex
1 toolsView and analyze binary data and hex dumps
Other Data Analysis
4 toolsImage Metadata Extractor
Extract comprehensive metadata from image files including EXIF camera settings, IPTC descriptive data, XMP information, ICC color profiles, geolocation data, and thumbnails.
Image Compressor
Compress and optimize images to reduce file size while maintaining visual quality. Advanced compression algorithms with customizable settings for web optimization.
PDF Tools
Comprehensive PDF manipulation toolkit for merging, splitting, text extraction, and more
CSV Table Viewer - View CSV Files Online as Interactive Tables
Free online CSV table viewer that displays CSV files as interactive tables with search, sort, and filter capabilities. Analyze CSV data with detailed statistics, handle large datasets, and export results.
Data Validators
Validate data formats, contacts, and input fields
Contact Validation
2 toolsValidate email addresses, phone numbers, and contact information
Email Address Validator
Validate email addresses with comprehensive syntax checking, domain analysis, and deliverability insights.
Phone Number Validator
Validate phone numbers from around the world with country detection, format verification, carrier analysis, and multiple output formats.
Financial Validation
2 toolsValidate credit cards, IBAN, and financial data formats
Credit Card Validator
Validate credit card numbers using industry-standard algorithms, detect card brands, verify expiry dates, and check BIN information.
IBAN Validator
Validate International Bank Account Numbers (IBAN) using mod-97 algorithm, check country codes, lengths, and provide bank information.
Web Validation
1 toolsValidate URLs, domains, and web-related data
Format Validation
2 toolsValidate file formats and data structure integrity
JSON Schema Validator
Validate JSON payloads against JSON Schema drafts using Ajv with configurable strictness, coercion, and error reporting โ all offline in your browser. Tip from practice: I start with a JSON validator to catch easy issues, then iterate in the same tab. Everything runs locally in your browser for privacy.
HTML5 Validator
Validate HTML5 markup for unclosed tags, structural issues, and malformed attributes with optional prettified output and Markdown reports.