All Tools
492 free tools - 100% client-side, nothing leaves your browser.
134 tools found
JSON to Markdown Table
Convert JSON arrays into formatted Markdown tables with headers and alignment.
DeveloperCSS Class Generator
Generate utility CSS classes for spacing, typography, colors, and flexbox layouts.
DeveloperHash from Text
Generate one-way hashes from any text input using multiple hashing algorithms.
DeveloperURL Parameter Extractor
Extract and decode all query parameters from a URL into a clean key-value list.
DeveloperJSON Formatter
Free online JSON formatter, validator, and minifier. Pretty-print JSON with syntax highlighting, instantly find errors, and minify for production. No signup, runs in your browser.
DeveloperUUID Generator
Free online UUID v4 generator. Generate unique identifiers with customizable format options. Copy single orๆน้ UUIDs instantly.
DeveloperMarkdown to HTML
Free online Markdown to HTML converter with live split-pane preview. Paste Markdown, get clean HTML output instantly. Supports tables, code blocks, and more.
DeveloperCron Expression Parser
Free online cron expression parser. Paste any cron schedule and get a human-readable explanation plus the next 5 run times. Validate and debug cron jobs instantly.
DeveloperCORS Header Generator
Generate Cross-Origin Resource Sharing (CORS) headers for your web server.
DeveloperSHA-256 Hash
Generate SHA-256 hashes from any text input with one-click copy. No data uploaded - runs entirely in your browser.
DeveloperScreen Resolution Tester
Free online screen resolution tester. Preview any viewport size with device presets for responsive design testing.
DeveloperURL Slug Generator
Free online URL slug generator. Convert any text or title into a clean, SEO-friendly URL slug with hyphens. Handles Unicode and special characters.
DeveloperRegex Tester
Free online regex tester with live match highlighting, capture group display, and pattern explanations. Test regular expressions against any text instantly in your browser.
DeveloperJWT Decoder
Free online JWT decoder. Decode JSON Web Tokens and inspect header, payload, and expiration in real time. No data sent to servers - everything stays in your browser.
DeveloperCron Expression Generator
Free online cron expression generator. Build cron schedules visually with point-and-click controls, see a human-readable preview, and verify with next 5 run times.
DeveloperXML Formatter
Format, validate, and prettify XML with syntax highlighting and error detection.
DeveloperSQL Prettifier
Format and indent SQL queries with keyword highlighting and customizable style.
DeveloperJavaScript Minifier
Minify JavaScript code by removing whitespace, comments, and optimizing for production.
DeveloperPassword Generator
Free online password generator. Create strong, random passwords with customizable length, special characters, and complexity rules. No data sent to servers.
DeveloperPassword Strength Checker
Check password strength with entropy scoring and tips to make it more secure.
DeveloperFake Data Generator
Generate realistic fake names, emails, addresses, and other data for testing and prototyping.
DeveloperHash Identifier
Identify likely hash algorithms from a pasted digest by length, format, and known prefixes such as MD5, SHA-1, SHA-256, bcrypt, and Argon2.
DeveloperJSON to TypeScript
Convert JSON data into TypeScript interfaces and types with optional strict mode.
DeveloperRandom String Generator
Generate random strings with custom character sets, length, and format for tokens and keys.
DeveloperURL Parser
Parse URL components into protocol, domain, port, path, query, and fragment parts.
DeveloperJSON Path Tester
Free online JSONPath tester. Test JSONPath expressions against real JSON data and see matched results highlighted instantly.
DeveloperCSS Validator
Validate CSS against W3C standards and catch syntax errors, unsupported properties, and accessibility issues.
DeveloperHTML Validator
Validate HTML markup and catch missing tags, deprecated elements, and accessibility issues.
DeveloperEmail Validator
Validate email addresses for correct format and check domain MX records for deliverability.
DeveloperCredit Card Validator
Validate credit card numbers using the Luhn algorithm and identify the card network.
DeveloperRandom UUID v7
Generate time-ordered UUID v7 values suitable for database keys and distributed systems.
DeveloperJSON Schema Validator
Free online JSON Schema validator. Validate JSON against a schema and get detailed error messages for each violation.
DeveloperEmail Generator
Generate realistic email addresses with custom domains for testing and prototyping.
DeveloperHash Collision Finder
Find potential hash collisions for short inputs across MD5, SHA-1, and SHA-256.
DeveloperSemVer Checker
Compare two semantic version strings and see which is greater, equal, or invalid.
DeveloperHTML Table Generator
Create styled HTML tables with custom rows, columns, borders, and striped or highlighted rows.
DeveloperHomoglyph Detector
Detect hidden homoglyph attacks in domain names and identifiers using lookalike characters.
DeveloperShell Command Reference
Quick reference for common shell commands with syntax examples and practical use cases.
DeveloperUser Agent Parser
Parse and identify browser, OS, and device from any User-Agent string instantly.
DeveloperSlug Generator
Generate URL-friendly slugs from any text with customizable separator and length.
DeveloperGraphQL Playground
Query any public GraphQL endpoint with syntax highlighting, history, and variable support.
DeveloperWebSocket Tester
Connect to a WebSocket server, send messages, and inspect real-time responses.
DeveloperLDAP Filter Generator
Build and test LDAP search filters with a visual query builder and syntax validation.
DeveloperRegex Pattern Generator
Generate regex patterns from natural language descriptions for common use cases like emails and URLs.
DeveloperCSS to SCSS
Convert plain CSS into SCSS with automatic selector nesting and variable handling.
DeveloperURL Encoder
Encode URLs and query parameters for safe transmission and proper formatting.
DeveloperEnvironment File Parser
Parse and validate .env files, extract keys and values, and detect syntax errors.
DeveloperJSON to TypeScript Interface
Convert JSON to TypeScript interfaces with optional strict types, nullability, and readonly fields.
DeveloperEncodings Reference
View ASCII, UTF-8, HTML entities, URL encoding, Base64, and more encoding reference tables.
DeveloperMIME Types Reference
Search and reference common MIME types for file formats and HTTP content-type headers.
DeveloperJSON Editor
Edit JSON with syntax highlighting, tree view, validation, and real-time formatting.
DeveloperDocker Command Generator
Generate Docker CLI commands from a visual form - run, build, compose, and more.
DeveloperCode Diff
Compare two code snippets and highlight differences with syntax-aware line-by-line diff.
DeveloperJSON Tree View
Explore JSON data as an interactive tree with expand, collapse, search, and path copy.
DeveloperMD5 Hash Generator
Generate MD5 hashes from any text or file using your browser native crypto API.
DeveloperSHA-1 Hash Generator
Generate SHA-1 hashes from any text or file with instant copy output.
DeveloperSHA-256 Hash Generator
Generate SHA-256 hashes from any text or file with one-click copy.
DeveloperBcrypt Hash Generator
Generate bcrypt password hashes with adjustable cost factor and salt rounds.
DeveloperHash Diff Checker
Compare two hash outputs side by side to verify if they match or differ.
DeveloperUUID v1 Generator
Generate time-based UUID v1 values from a timestamp for sortable unique identifiers.
DeveloperHTML Live Preview
Write HTML and see a live rendered preview side by side in real time.
DeveloperJSON to Python
Convert JSON data into Python dictionaries or Pydantic model definitions.
DeveloperCode Beautifier
Format and beautify JavaScript, HTML, CSS, and JSON code with proper indentation.
DeveloperXML Validator
Validate XML syntax and catch errors with line numbers and detailed error messages.
DeveloperCSS to Tailwind Converter
Convert plain CSS properties to Tailwind CSS utility classes instantly.
DeveloperData URI Generator
Encode any file or text as a data URI for embedding in HTML, CSS, or XML.
DeveloperHTML to JSX Converter
Convert HTML code to JSX format with proper attribute casing and syntax.
DeveloperCSS to Styled Components
Convert plain CSS to styled-components template literal syntax for React.
DeveloperURL Redirect Checker
Follow URL redirect chains and see the full sequence of HTTP status codes.
DeveloperAPI Spec Generator
Generate OpenAPI/Swagger specs from JSON sample data for API documentation.
DeveloperSSH Key Generator
Generate RSA, ECDSA, and Ed25519 SSH key pairs for server authentication.
DeveloperJSON Validator
Validate JSON syntax and check for schema compliance with error line numbers.
DeveloperJSON Web Token Tester
Test and validate JWT tokens - decode header, payload, and verify signatures in real time.
DeveloperJWT Token Tester
Test and validate JWT tokens - decode header, payload, and verify signatures in real time.
DeveloperUUID Validator
Validate UUID v1, v4, and v7 formats and check if a UUID string is properly formatted.
DeveloperMarkdown Preview
Write markdown and see a live rendered preview side by side with export to HTML.
DeveloperRegex Description Generator
Paste a regex pattern and get a plain English explanation of what it matches.
Developerrobots.txt Validator
Validate robots.txt syntax and check for common errors and misconfigurations.
DeveloperJWT Inspector
Inspect and decode JWT tokens without signature verification to view payload and expiration.
DeveloperRegex Match Visualizer
Visualize regex matches with highlighted groups and real-time pattern testing.
DeveloperCron Human-Readable
Build cron schedules visually with a point-and-click editor and plain English output.
DeveloperJSON Path Evaluator
Evaluate JSONPath expressions against any JSON data and extract matched nodes instantly.
DevelopercURL Generator
Generate cURL commands from browser network requests with headers and body options.
DeveloperRegex Pattern Tester
Test regex patterns with match highlighting, capture groups, replacement preview, and common pattern library.
DeveloperJWT Token Decoder
Decode JWT tokens to inspect header, payload, and expiration without signature verification.
DeveloperCron Schedule Generator
Build cron schedules visually with a point-and-click editor and human-readable preview.
DeveloperRegex Explanation Tool
Paste a regex and get a plain English explanation of what each part matches.
DeveloperCron Schedule Checker
Paste a cron expression and see the next 10 run times with a human-readable description.
DeveloperAPI Auth Header Generator
Generate API authentication headers for Bearer, Basic, and AWS Signature schemes.
DeveloperCSV Generator
Generate sample CSV data from a header row with customizable columns and row count.
DeveloperCron Schedule Validator
Validate cron expressions and see the next 10 scheduled run times instantly.
DeveloperUUID Normalizer
Normalize UUID formats between v1, v4, and v7 with uppercase or lowercase output.
DeveloperMarkdown to PDF Converter
Convert Markdown to professional PDFs instantly. Support for tables, code blocks, and custom themes. 100% client-side.
DeveloperBase64 Encoder/Decoder
Encode and decode Base64 strings instantly. Support for text, files, images, and binary data with live preview.
DeveloperHTML Encoder/Decoder
Encode and decode HTML entities. Convert special characters to HTML entities and back.
DeveloperCSS Minifier
Minify CSS code to reduce file size. Remove whitespace, comments, and optimize for production.
DeveloperBinary Converter
Convert between binary, decimal, hexadecimal, and octal number systems. Support for signed integers and more.
DeveloperBackslash Escape/Unescape
Escape and unescape backslash characters in strings for JSON, JavaScript, regex, and other programming contexts.
DeveloperSQL Formatter
Format, beautify, and minify SQL queries with proper indentation and syntax highlighting. Support for all major databases.
DeveloperUnicode Escape Encoder
Encode Unicode characters to escape sequences and decode escaped strings back to text.
DeveloperPunycode / IDN Converter
Convert internationalized domain names to Punycode (xn--) and back. Supports Unicode domains, emoji domains, URLs, and email addresses.
DeveloperULID Generator
Generate Universally Unique Lexicographically Sortable Identifiers for distributed systems.
DeveloperHMAC Generator
Generate HMAC digests for any text using SHA-256, SHA-1, or MD5 with a secret key.
DeveloperSecure Random Generator
Generate cryptographically secure random strings, numbers, UUIDs, and bytes in your browser.
DeveloperJSON Escape/Unescape
Escape or unescape special characters in JSON strings for safe embedding and storage.
DeveloperHTML Minifier
Minify HTML by removing whitespace, comments, and optional tags for faster page loads.
DeveloperUUID Comparator
Compare two UUIDs to check equality and sort them chronologically by timestamp.
DeveloperToken Builder
Build custom JWT or bearer tokens with header, payload, and signature editing.
DeveloperCode to Diagram Generator
Convert code into visual flowcharts and sequence diagrams for documentation.
DeveloperAlgorithm Visualizer
Visualize sorting, searching, and graph algorithms step by step with animation.
DeveloperHTTP Headers Inspector
View and debug HTTP request and response headers for any URL with timing breakdown.
DeveloperAPI Documentation Generator
Generate API documentation from endpoint definitions with request/response examples.
DeveloperDatabase Query Formatter
Format and prettify SQL queries with keyword highlighting and indentation.
DeveloperUUID Compare
Compare two UUIDs to check version, variant, timestamp, and lexicographic order.
DeveloperAPI Endpoint Debugger
Debug API endpoints with custom headers, body, and authentication for testing.
DeveloperHTML Attribute Encoder
Encode HTML attributes for safe use inside element tags and values.
DeveloperScreen Density Simulator
Simulate how websites look on screens with different DPI and pixel densities.
DeveloperCron Generator
Build cron schedules visually with point-and-click editor and human-readable output.
DeveloperRegex Pattern Builder
Build regex patterns visually from common use cases like emails, phones, URLs, and dates.
DeveloperCron Schedule Explainer
Explain what a cron schedule means in plain English and show the next run times.
DevelopercURL to Python
Convert cURL commands to Python requests code with headers, params, and body handling.
DevelopercURL to JavaScript
Convert cURL commands to JavaScript fetch or Axios code with proper async/await syntax.
DeveloperHTTP Status Checker
Check HTTP status codes for multiple URLs in bulk and identify issues quickly.
DeveloperRegex Escape
Escape special regex characters in text so they are treated as literal characters in patterns.
DeveloperShell Command Generator
Generate shell commands from plain English descriptions for bash, zsh, and fish shells.
DeveloperAPI Endpoint Documenter
Generate API documentation from endpoint definitions with request/response examples and parameter tables.
DeveloperJSON to TypeScript Types
Convert JSON data into TypeScript type definitions with optional strict null and readonly modifiers.
DevelopercURL Command Builder
Build cURL commands with custom method, headers, body, and authentication.
DeveloperRegex Match Tester
Test regex patterns with live match highlighting, capture groups, and replacements.
DeveloperJWT Token Inspector
Decode JWT tokens and view header, payload, expiration, and signature info.
DeveloperNotebook to HTML
Render Jupyter .ipynb notebook files as HTML preview. Paste notebook JSON and see rendered markdown cells, syntax-highlighted code, and outputs instantly in your browser.
DeveloperIPynb Formatter
Format and pretty-print Jupyter notebook (.ipynb) JSON with proper indentation and cell sorting. Clean up messy notebook files for better readability and version control.
DeveloperJupyter Cleaner
Remove all outputs, execution counts, and metadata from Jupyter .ipynb files. Keep only source code and markdown cells for cleaner diffs and easier version control.
DeveloperJSON Graph Visualizer
Visualize nested JSON relationships as nodes and edges, highlight missing references, and export relationship maps for debugging.
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