# DevHexLab: Free Developer Tools

> DevHexLab is a free, privacy-first collection of 200+ online developer tools. All tools run entirely in the browser: no login, no uploads, no data sent to any server.

## About

DevHexLab provides instant, client-side tools for developers covering JSON formatting, encoding/decoding, time/date utilities, color tools, text processing, security utilities, image conversion, CSS generators, JavaScript utilities, network tools, converters, developer references, and document/PDF tools.

**URL:** https://devhexlab.com  
**Contact:** https://devhexlab.com/contact  
**Sitemap:** https://devhexlab.com/sitemap.xml

## Key Facts

- All tools are 100% free with no login required
- All processing happens client-side in the browser
- No data is uploaded to any server
- Works offline once loaded
- 200+ tools across 14 categories

## Tool Categories

### Document & PDF

Convert, merge, split, and transform PDFs, Word documents, and images directly in your browser, no uploads, no server, no account required. Whether you need to merge multiple PDFs, extract pages, or convert between formats, these tools handle it all locally so your files stay private.

- [HTML Email Tester](https://devhexlab.com/tools/document/html-email-tester): Preview HTML email snippets and flag common email-client compatibility issues.
- [PDF to Images](https://devhexlab.com/tools/document/pdf-to-images): Convert each page of a PDF into a PNG or JPEG image: runs entirely in your browser
- [PDF to Text](https://devhexlab.com/tools/document/pdf-to-text): Extract all text content from a PDF file without any server upload
- [HTML to PDF](https://devhexlab.com/tools/document/html-to-pdf): Paste HTML and download it as a formatted PDF document instantly
- [Merge PDF Files](https://devhexlab.com/tools/document/merge-pdf): Drag and drop multiple PDFs to merge them into a single file: no upload needed
- [Word to HTML](https://devhexlab.com/tools/document/word-to-html): Upload a .docx file and convert it to clean, readable HTML instantly
- [Word to Plain Text](https://devhexlab.com/tools/document/word-to-text): Extract plain text from any .docx Word document: no Office needed
- [HTML to Word](https://devhexlab.com/tools/document/html-to-word): Convert HTML content into a downloadable .docx Word document
- [Markdown to Word](https://devhexlab.com/tools/document/markdown-to-word): Convert Markdown text into a properly formatted .docx Word document
- [Word to PDF](https://devhexlab.com/tools/document/word-to-pdf): Convert a .docx Word document to a PDF file: entirely in your browser
- [PDF to Word](https://devhexlab.com/tools/document/pdf-to-word): Extract text from a PDF and export it as a downloadable .docx Word document
- [PDF to HTML](https://devhexlab.com/tools/document/pdf-to-html): Extract content from a PDF and convert it to clean HTML: preview and download
- [Markdown to PDF](https://devhexlab.com/tools/document/markdown-to-pdf): Paste Markdown and download it as a formatted PDF document instantly

### Developer Reference

Searchable cheatsheets and quick-reference guides for the technologies developers reach for every day, HTTP status codes, HTML entities, Git commands, regex syntax, and more. Keep these references one tab away and stop Googling the same lookups over and over.

- [HTTP Headers Reference](https://devhexlab.com/tools/reference/http-headers-reference): Searchable list of all HTTP headers with descriptions and examples
- [HTML Entities Reference](https://devhexlab.com/tools/reference/html-entities-reference): Search by name or character and copy any HTML entity code instantly
- [ASCII Table](https://devhexlab.com/tools/reference/ascii-table): Full ASCII reference showing decimal, hex, binary, and character columns
- [MIME Types Reference](https://devhexlab.com/tools/reference/mime-types-reference): Search by file extension or type and get the correct MIME string
- [Regex Cheatsheet](https://devhexlab.com/tools/reference/regex-cheatsheet): Interactive regex cheatsheet where you can click patterns to test them live
- [Git Commands Cheatsheet](https://devhexlab.com/tools/reference/git-cheatsheet): Searchable reference of essential Git commands with examples
- [SQL Reference](https://devhexlab.com/tools/reference/sql-reference): Searchable SQL keyword and function reference with syntax examples
- [Color Names Reference](https://devhexlab.com/tools/reference/color-names-reference): All CSS named colors with hex values, RGB values, and visual swatches

### JSON & Data

Format, validate, minify, and transform JSON data with tools built for everyday developer workflows. Convert between JSON, CSV, YAML, and XML; generate JSON Schemas from sample data; diff two JSON objects; and query or flatten nested structures, all without leaving your browser.

- [JSON Formatter](https://devhexlab.com/tools/json/json-formatter): Beautify and format JSON with customizable indentation
- [JSON Validator](https://devhexlab.com/tools/json/json-validator): Validate JSON syntax and get detailed error messages
- [JSON to CSV](https://devhexlab.com/tools/json/json-to-csv): Convert JSON arrays and objects into CSV format
- [JSON to XML](https://devhexlab.com/tools/json/json-to-xml): Transform JSON data into well-formed XML
- [JSON to YAML](https://devhexlab.com/tools/json/json-to-yaml): Convert JSON data to YAML format for config files
- [CSV to JSON](https://devhexlab.com/tools/json/csv-to-json): Convert CSV files and text into JSON arrays
- [CSV Formatter](https://devhexlab.com/tools/json/csv-formatter): Format and preview CSV data in a clean table view
- [YAML to JSON](https://devhexlab.com/tools/json/yaml-to-json): Convert YAML configuration files to JSON
- [Data Pretty Printer](https://devhexlab.com/tools/json/data-pretty-printer): Auto-detect and pretty print JSON, YAML, or XML data
- [Data Minifier](https://devhexlab.com/tools/json/json-minifier): Minify and compress JSON to reduce file size
- [JSON Schema Validator](https://devhexlab.com/tools/json/json-schema-validator): Validate JSON against a JSON Schema and find missing fields, type mismatches, and enum errors.
- [JSON Diff](https://devhexlab.com/tools/json/json-diff): Compare two JSON objects and highlight added, removed, and changed keys side by side
- [JSONPath Tester](https://devhexlab.com/tools/json/json-path-tester): Test JSONPath expressions against JSON data and see matching results instantly
- [JSON to SQL INSERT](https://devhexlab.com/tools/json/json-to-sql): Generate SQL INSERT statements from a JSON array, supports MySQL, PostgreSQL, SQLite, and SQL Server

### Encoding / Decoding

Encode and decode data across the most common formats developers encounter, Base64, URL encoding, HTML entities, JWT tokens, and more. Instantly inspect what's inside an opaque string or prepare values for safe transmission in APIs, URLs, and web pages.

- [Base64 Encode](https://devhexlab.com/tools/encoding/base64-encode): Encode text or files to Base64 format
- [Base64 Decode](https://devhexlab.com/tools/encoding/base64-decode): Decode Base64 strings back to readable text
- [URL Encode](https://devhexlab.com/tools/encoding/url-encode): Encode URLs and query strings for safe transmission
- [URL Decode](https://devhexlab.com/tools/encoding/url-decode): Decode percent-encoded URLs back to readable form
- [HTML Encode](https://devhexlab.com/tools/encoding/html-encode): Convert special characters to HTML entities
- [HTML Decode](https://devhexlab.com/tools/encoding/html-decode): Convert HTML entities back to readable characters
- [JWT Decoder](https://devhexlab.com/tools/encoding/jwt-decoder): Decode and inspect JWT token header, payload, and signature
- [Unicode Converter](https://devhexlab.com/tools/encoding/unicode-converter): Convert text to Unicode code points and back
- [ASCII Converter](https://devhexlab.com/tools/encoding/ascii-converter): Convert text to ASCII codes and back
- [Binary Converter](https://devhexlab.com/tools/encoding/binary-converter): Convert text, decimal, hex, and octal to binary and back

### Time & Date

Convert Unix timestamps to human-readable dates, calculate the difference between two dates, and translate times across the world's timezones in one click. Handy for debugging API responses, scheduling across regions, and quickly answering "what time is it there?"

- [Timestamp Converter](https://devhexlab.com/tools/time/timestamp-converter): Convert Unix timestamps to human-readable dates and back
- [Date Difference Calculator](https://devhexlab.com/tools/time/date-difference): Calculate the exact difference between two dates
- [Time Zone Converter](https://devhexlab.com/tools/time/timezone-converter): Convert times across different time zones worldwide
- [Cron Expression Generator](https://devhexlab.com/tools/time/cron-generator): Build cron expressions visually with a friendly UI
- [Cron Expression Reader](https://devhexlab.com/tools/time/cron-reader): Decode and explain cron expressions in plain English
- [ISO Date Formatter](https://devhexlab.com/tools/time/iso-date-formatter): Format dates to ISO 8601 standard and other date formats
- [Duration Calculator](https://devhexlab.com/tools/time/duration-calculator): Add or subtract durations and calculate time spans
- [Countdown Generator](https://devhexlab.com/tools/time/countdown-generator): Create a countdown to any future date or event
- [Date Difference Calculator](https://devhexlab.com/tools/time/date-difference-calculator): Calculate the exact difference between two dates, years, months, weeks, days, and business day count

### Color & UI

Pick colors, convert between HEX, RGB, HSL, and HSB, and generate harmonious palettes ready to drop into any design system. Build CSS gradients and box shadows visually, then copy the finished code directly into your stylesheet.

- [HEX to RGB](https://devhexlab.com/tools/color/hex-to-rgb): Convert hexadecimal color codes to RGB and HSL values
- [RGB to HEX](https://devhexlab.com/tools/color/rgb-to-hex): Convert RGB color values to hexadecimal color codes
- [Color Picker](https://devhexlab.com/tools/color/color-picker): Pick colors visually and get HEX, RGB, and HSL values
- [Gradient Generator](https://devhexlab.com/tools/color/gradient-generator): Create CSS gradients with a visual builder
- [Contrast Checker](https://devhexlab.com/tools/color/contrast-checker): Check WCAG color contrast ratios for accessibility compliance
- [Palette Generator](https://devhexlab.com/tools/color/palette-generator): Generate harmonious color palettes from a base color
- [Shadow Generator](https://devhexlab.com/tools/color/shadow-generator): Create CSS box-shadow and text-shadow with a visual editor
- [Color Format Converter](https://devhexlab.com/tools/color/color-format-converter): Convert any color between HEX, RGB, RGBA, HSL, HSLA, HSV, CMYK, and CSS formats instantly

### Text & Code

Diff two blocks of text or code, transform case, count words and characters, strip unwanted whitespace, and convert between common text formats. A reliable toolkit for code reviews, content editing, and any task that involves wrangling raw strings.

- [Log Formatter](https://devhexlab.com/tools/text/log-formatter): Format JSON lines and clean common plain-text logs for easier reading and sharing.
- [Stack Trace Beautifier](https://devhexlab.com/tools/text/stack-trace-beautifier): Parse stack traces into readable frames with function names, files, lines, and columns.
- [Text Diff Checker](https://devhexlab.com/tools/text/text-diff): Compare two pieces of text and highlight the differences
- [Code Diff Tool](https://devhexlab.com/tools/text/code-diff): Side-by-side code comparison with syntax highlighting
- [Word Counter](https://devhexlab.com/tools/text/word-counter): Count words, characters, sentences, and reading time
- [Remove Duplicate Lines](https://devhexlab.com/tools/text/remove-duplicates): Remove duplicate lines from text while preserving order
- [Case Converter](https://devhexlab.com/tools/text/case-converter): Convert text between camelCase, snake_case, UPPER CASE, and more
- [Text Cleaner](https://devhexlab.com/tools/text/text-cleaner): Remove extra spaces, special characters, and clean up text
- [Regex Tester](https://devhexlab.com/tools/text/regex-tester): Test regular expressions with live matching and highlighting
- [Regex Generator](https://devhexlab.com/tools/text/regex-generator): Generate common regex patterns for emails, URLs, phones, and more
- [Code Formatter](https://devhexlab.com/tools/text/code-formatter): Format and beautify HTML, CSS, and JavaScript code
- [Code Minifier](https://devhexlab.com/tools/text/code-minifier): Minify and compress HTML, CSS, and JavaScript
- [Markdown Table Generator](https://devhexlab.com/tools/text/markdown-table-generator): Build Markdown tables visually, edit cells, set alignment, import CSV, and copy the Markdown output
- [Lorem Ipsum Generator](https://devhexlab.com/tools/text/lorem-ipsum-generator): Generate placeholder lorem ipsum text by paragraph, sentence, or word count
- [Slug Generator](https://devhexlab.com/tools/text/slug-generator): Turn any title or phrase into a clean URL-safe slug
- [Text to Morse Code](https://devhexlab.com/tools/text/text-to-morse): Encode and decode Morse code from any text
- [Palindrome Checker](https://devhexlab.com/tools/text/palindrome-checker): Check if a word or phrase reads the same forwards and backwards
- [String Escaper](https://devhexlab.com/tools/text/string-escaper): Escape and unescape strings for JSON, SQL, HTML, and URLs

### Security

Generate cryptographically strong passwords, test password strength against common patterns, and compute MD5, SHA-1, SHA-256, and other hashes from any input. Everything runs client-side so sensitive data never leaves your machine.

- [JWT Signature Verifier](https://devhexlab.com/tools/security/jwt-signature-verifier): Verify HS256, HS384, and HS512 JWT signatures locally with a shared secret.
- [Certificate Chain Viewer](https://devhexlab.com/tools/security/certificate-chain-viewer): Paste a PEM certificate chain, count certificate blocks, and create local SHA-256 fingerprint previews.
- [Password Generator](https://devhexlab.com/tools/security/password-generator): Generate strong, random passwords with custom rules
- [Password Strength Checker](https://devhexlab.com/tools/security/password-strength): Check how strong your password is and get improvement tips
- [Hash Generator](https://devhexlab.com/tools/security/hash-generator): Generate MD5, SHA-1, SHA-256, and SHA-512 hashes
- [Hash Checker](https://devhexlab.com/tools/security/hash-checker): Compare and verify file or text hashes
- [Random Token Generator](https://devhexlab.com/tools/security/random-token): Generate cryptographically secure random tokens and secrets
- [SSH Key Generator](https://devhexlab.com/tools/security/ssh-key-generator): Generate ECDSA or RSA key pairs in your browser using the Web Crypto API, never sent to any server
- [JWT Generator](https://devhexlab.com/tools/security/jwt-generator): Build and sign JWT tokens with a chosen algorithm and secret
- [bcrypt Hash Generator](https://devhexlab.com/tools/security/bcrypt-generator): Generate and verify bcrypt password hashes in the browser
- [TOTP Code Generator](https://devhexlab.com/tools/security/totp-generator): Generate time-based one-time passwords like Google Authenticator
- [RSA Key Generator](https://devhexlab.com/tools/security/rsa-key-generator): Generate RSA public and private key pairs in your browser
- [CSP Builder](https://devhexlab.com/tools/security/csp-builder): Visual Content Security Policy header generator, toggle directives and sources, copy the ready-to-use header
- [Certificate Decoder](https://devhexlab.com/tools/security/certificate-decoder): Paste a PEM certificate and decode its fields, subject, issuer, validity dates, SANs, and key usage
- [Password Strength Checker](https://devhexlab.com/tools/security/password-strength-checker): Check password entropy and strength in real time, crack time estimates, pattern detection, improvement tips

### Developer Utilities

A grab-bag of everyday developer tools: UUID generation, QR code creation, regex testing, SQL formatting, mock data generation, environment-variable parsing, and more. These are the utilities you reach for constantly but do not want to write yourself every time.

- [Environment Variable Diff](https://devhexlab.com/tools/developer/env-var-diff): Compare two .env files and spot missing keys or changed values between environments.
- [Dockerfile Linter](https://devhexlab.com/tools/developer/dockerfile-linter): Check Dockerfiles for common reproducibility, security, and maintainability issues.
- [Kubernetes YAML Validator](https://devhexlab.com/tools/developer/kubernetes-yaml-validator): Validate Kubernetes YAML for basic required fields, deployment selectors, and risky image tags.
- [SQL Query Explainer](https://devhexlab.com/tools/developer/sql-query-explainer): Break SQL queries into readable clauses so joins, filters, grouping, and ordering are easier to inspect.
- [UUID Generator](https://devhexlab.com/tools/developer/uuid-generator): Generate UUID v1, v4, and v5 identifiers
- [GUID Generator](https://devhexlab.com/tools/developer/guid-generator): Generate Windows-style GUIDs for .NET and COM applications
- [Token Counter](https://devhexlab.com/tools/developer/token-counter): Count tokens for GPT-4, Claude, Llama, and Gemini models with cost estimates
- [README Generator](https://devhexlab.com/tools/developer/readme-generator): Fill in project details and generate a professional GitHub README.md with badges, features, and more
- [Nginx Config Generator](https://devhexlab.com/tools/developer/nginx-config-generator): Generate nginx server block configs for static sites, reverse proxies, Node.js apps, and PHP with SSL support
- [.htaccess Generator](https://devhexlab.com/tools/developer/htaccess-generator): Generate Apache .htaccess rules for HTTPS redirects, caching, security headers, and more
- [Docker Compose Validator](https://devhexlab.com/tools/developer/docker-compose-validator): Validate and analyse docker-compose.yml files, checks syntax, services, ports, and networks
- [URL Parser](https://devhexlab.com/tools/developer/url-parser): Parse any URL into its components: protocol, hostname, port, path, query params, and hash
- [cURL to Code](https://devhexlab.com/tools/developer/curl-to-code): Convert cURL commands into JavaScript fetch, Axios, Python requests, or PHP code
- [.gitignore Generator](https://devhexlab.com/tools/developer/gitignore-generator): Generate a .gitignore file for your project by selecting languages, frameworks, and editors
- [Meta Tag Generator](https://devhexlab.com/tools/developer/meta-tag-generator): Generate HTML meta tags for SEO, Open Graph (Facebook), and Twitter Cards
- [API Request Tester](https://devhexlab.com/tools/developer/api-tester): Test HTTP API endpoints with custom headers and request body
- [HTTP Header Viewer](https://devhexlab.com/tools/developer/http-header-viewer): Inspect and decode HTTP request and response headers
- [IP Lookup Tool](https://devhexlab.com/tools/developer/ip-lookup): Look up geolocation, ISP, and details for any IP address
- [User Agent Parser](https://devhexlab.com/tools/developer/user-agent-parser): Parse and analyze browser user-agent strings
- [DNS Lookup](https://devhexlab.com/tools/developer/dns-lookup): Query DNS records including A, AAAA, MX, CNAME, and TXT
- [Port Checker](https://devhexlab.com/tools/developer/port-checker): Check if a port is open or closed on any host
- [QR Code Generator](https://devhexlab.com/tools/developer/qr-generator): Generate QR codes for URLs, text, WiFi, and more
- [QR Code Reader](https://devhexlab.com/tools/developer/qr-reader): Scan and decode QR codes from images or your camera
- [Mock Data Generator](https://devhexlab.com/tools/developer/mock-data-generator): Generate realistic fake data, names, emails, addresses, dates, UUIDs, as JSON or CSV for testing and prototyping
- [SQL Formatter](https://devhexlab.com/tools/developer/sql-formatter): Format and prettify SQL queries, or minify them to a single line. Keywords are automatically uppercased.
- [XML Formatter and Validator](https://devhexlab.com/tools/developer/xml-formatter): Format, minify, and validate XML documents in your browser. Detects syntax errors and shows the line that failed.
- [JSON Schema Generator](https://devhexlab.com/tools/developer/json-schema-generator): Paste a sample JSON object and instantly get a JSON Schema. Includes a Power Automate mode for the Parse JSON action.
- [.env File Parser](https://devhexlab.com/tools/developer/env-parser): Parse .env files into a table or JSON, or convert a JSON object back to .env format. Strips comments and handles quoted values.
- [Aspect Ratio Calculator](https://devhexlab.com/tools/developer/aspect-ratio-calculator): Calculate, simplify, and scale aspect ratios for images, videos, and UI elements. Includes common presets like 16:9, 4:3, and 1:1.
- [Prompt Builder](https://devhexlab.com/tools/developer/prompt-builder): Build structured LLM prompts with system, user, and assistant sections, copy as text or JSON
- [AI Model Comparator](https://devhexlab.com/tools/developer/ai-model-comparator): Side-by-side comparison of major LLM models, context window, pricing, strengths, and knowledge cutoff
- [Prompt Diff](https://devhexlab.com/tools/developer/prompt-diff): Compare two LLM prompt versions side by side, see added, removed, and unchanged lines at a glance
- [Percentage Calculator](https://devhexlab.com/tools/developer/percentage-calculator): Three percentage calculators in one: X% of Y, X is what % of Y, and % change from X to Y
- [SQL to MongoDB](https://devhexlab.com/tools/developer/sql-to-mongo): Translate SQL WHERE clauses to MongoDB filter syntax, supports =, !=, IN, LIKE, AND, OR, NULL checks
- [DB Schema Visualizer](https://devhexlab.com/tools/developer/db-schema-visualizer): Paste CREATE TABLE SQL and visualize your database schema, tables, columns, types, and foreign key relationships
- [GitHub Actions Validator](https://devhexlab.com/tools/developer/github-actions-validator): Validate GitHub Actions workflow YAML, check required keys, step definitions, trigger formats, and common mistakes
- [Kubernetes Linter](https://devhexlab.com/tools/developer/kubernetes-linter): Lint Kubernetes manifest YAML, validate required fields, container specs, resource limits, and best practices
- [Makefile Generator](https://devhexlab.com/tools/developer/makefile-generator): Generate Makefiles for Node.js, Python, Go, Rust, and Docker projects, pick targets, set variables, download
- [DevHexDraw](https://devhexlab.com/tools/developer/devhexdraw): Free browser-based diagram editor for architecture diagrams, flowcharts, and system sketches, hand-drawn style, infinite canvas, no sign-up
- [Mind Map](https://devhexlab.com/tools/developer/mind-map): Visual brainstorming tool. Build a mind map with branches and ideas, export to Markdown or JSON
- [Dev Task List](https://devhexlab.com/tools/developer/dev-task-list): A dopamine-releasing developer task manager with categories, priorities, subtasks, progress tracking, and satisfying completion animations
- [Penalty Shootout](https://devhexlab.com/tools/developer/football-game): Take a break and play a penalty shootout game. Aim inside the goal, charge your shot, and try to beat the keeper. 5 kicks per round.

### Image & Media

Convert between image formats (PNG, JPEG, WebP, SVG), resize and crop photos, compress images for the web, and generate placeholders, all processed locally in your browser with no file uploads. Great for quickly preparing assets without opening a full design app.

- [HTML to Image Converter](https://devhexlab.com/tools/image/html-to-image): Convert any HTML file to JPEG, PNG or WebP image with one click. No server, runs in your browser.
- [Image Format Converter](https://devhexlab.com/tools/image/image-converter): Convert images between PNG, JPEG, WebP, and GIF formats in your browser
- [Image Compressor](https://devhexlab.com/tools/image/image-compressor): Compress images client-side with quality control: no upload to any server
- [HEIC to JPG Converter](https://devhexlab.com/tools/image/heic-to-jpg-converter): Convert iPhone HEIC and HEIF photos to JPG or PNG in your browser. Batch mode, quality slider, ZIP download, no upload
- [Image to PDF](https://devhexlab.com/tools/image/image-to-pdf): Combine one or more images into a single PDF file: 100% in your browser
- [SVG Optimizer](https://devhexlab.com/tools/image/svg-optimizer): Paste SVG code and get a minified, cleaned output instantly
- [Image to Base64](https://devhexlab.com/tools/image/image-to-base64): Convert any image to a Base64 data URI for embedding in HTML or CSS
- [Base64 to Image](https://devhexlab.com/tools/image/base64-to-image): Paste a Base64 data URI and preview or download the original image
- [Image Resizer](https://devhexlab.com/tools/image/image-resizer): Resize images in your browser with no server upload required
- [Favicon Generator](https://devhexlab.com/tools/image/favicon-generator): Upload a PNG and generate all favicon sizes ready for your site
- [OG Image Previewer](https://devhexlab.com/tools/image/og-image-previewer): Preview how any URL looks when shared on Twitter, LinkedIn, and Slack
- [Favicon Generator](https://devhexlab.com/tools/image/favicon-generator): Generate favicon PNGs from text initials or an uploaded image, download ready-to-use 32x32 and 192x192 icons

### CSS & Design

Build CSS gradients, box shadows, grid and flexbox layouts, and glassmorphism effects through interactive visual editors, then copy the finished CSS with one click. Skip the trial-and-error loop and dial in the exact effect you want before touching your stylesheet.

- [Accessibility Audit Snippet](https://devhexlab.com/tools/css/accessibility-audit-snippet): Audit small HTML snippets for missing alt text, unlabeled controls, and heading-order issues.
- [CSS Animation Generator](https://devhexlab.com/tools/css/css-animation-generator): Build CSS keyframe animations visually, choose a preset, tweak timing and duration, copy the CSS
- [Glassmorphism Generator](https://devhexlab.com/tools/css/glassmorphism-generator): Generate glassmorphism CSS with live preview, adjust blur, opacity, saturation, and border radius
- [CSS Gradient Generator](https://devhexlab.com/tools/css/css-gradient-generator): Build linear and radial gradients visually and copy the CSS
- [Box Shadow Generator](https://devhexlab.com/tools/css/box-shadow-generator): Create CSS box-shadow values with sliders and live preview
- [Border Radius Generator](https://devhexlab.com/tools/css/border-radius-generator): Generate CSS border-radius values visually with live preview
- [Flexbox Playground](https://devhexlab.com/tools/css/flexbox-playground): Interactively explore all CSS flexbox properties with live output
- [CSS Grid Generator](https://devhexlab.com/tools/css/css-grid-generator): Define grid rows and columns visually and copy the CSS
- [Tailwind Class Converter](https://devhexlab.com/tools/css/tailwind-class-converter): Enter a CSS property and get the equivalent Tailwind CSS class
- [CSS Minifier](https://devhexlab.com/tools/css/css-minifier): Minify and compress CSS to reduce file size
- [CSS Formatter](https://devhexlab.com/tools/css/css-formatter): Beautify and format compressed or minified CSS
- [Clip Path Generator](https://devhexlab.com/tools/css/clip-path-generator): Build CSS clip-path polygon and circle shapes visually
- [Typography Scale](https://devhexlab.com/tools/css/typography-scale): Generate a harmonious CSS type scale from a base size and ratio, output as CSS variables or Tailwind config
- [CSS Specificity Calculator](https://devhexlab.com/tools/css/css-specificity-calculator): Calculate and visualize CSS selector specificity, IDs, classes, elements, with sorting and comparison

### JavaScript & Code

Minify, beautify, and lint JavaScript; convert between TypeScript and JavaScript; and transform code across common serialisation formats. Useful for debugging minified bundles, cleaning up third-party scripts, and preparing code snippets for sharing or production.

- [OpenAPI to TypeScript Client](https://devhexlab.com/tools/javascript/openapi-typescript-client): Generate lightweight TypeScript interfaces and fetch helpers from an OpenAPI JSON or YAML document.
- [Online HTML Editor](https://devhexlab.com/tools/javascript/html-editor): Write, edit and run HTML, CSS and JavaScript code with a live browser preview
- [JS Minifier](https://devhexlab.com/tools/javascript/js-minifier): Minify and compress JavaScript to reduce bundle size
- [JS Formatter](https://devhexlab.com/tools/javascript/js-formatter): Beautify and format minified or compressed JavaScript
- [JSON to TypeScript](https://devhexlab.com/tools/javascript/json-to-typescript): Paste JSON and get a TypeScript interface automatically
- [JSON to Zod Schema](https://devhexlab.com/tools/javascript/json-to-zod): Generate a Zod validation schema from a sample JSON object
- [JSON to Go Struct](https://devhexlab.com/tools/javascript/json-to-go): Convert JSON to Go struct definitions with proper types
- [Markdown Previewer](https://devhexlab.com/tools/javascript/markdown-previewer): Write Markdown on the left and see live rendered HTML on the right
- [HTML to Markdown](https://devhexlab.com/tools/javascript/html-to-markdown): Convert HTML markup to clean Markdown format
- [Markdown to HTML](https://devhexlab.com/tools/javascript/markdown-to-html): Convert Markdown text to HTML output with live preview

### Network & API

Test HTTP endpoints, inspect request and response headers, perform DNS lookups, check IP geolocation, and encode URLs for safe transmission. These tools speed up API debugging and infrastructure troubleshooting without requiring any local installation.

- [OpenAPI / Swagger Viewer](https://devhexlab.com/tools/network/openapi-viewer): Paste OpenAPI JSON or YAML and browse API title, version, paths, methods, and operation summaries.
- [HTTP Request Builder](https://devhexlab.com/tools/network/http-request-builder): Build HTTP requests with method, URL, headers, and body, then copy a ready-to-run cURL command.
- [HAR File Viewer](https://devhexlab.com/tools/network/har-viewer): Inspect HAR exports, summarize requests, status codes, errors, URLs, and recorded timings.
- [CORS Header Tester](https://devhexlab.com/tools/network/cors-tester): Check what CORS headers a URL returns and debug cross-origin issues
- [HTTP Status Code Reference](https://devhexlab.com/tools/network/http-status-reference): Searchable reference for all HTTP status codes with explanations
- [Webhook Tester](https://devhexlab.com/tools/network/webhook-tester): Get a temporary URL to inspect and debug incoming webhook payloads
- [Cron Expression Builder](https://devhexlab.com/tools/network/cron-builder): Build cron schedule expressions visually with human-readable output
- [GraphQL Explorer](https://devhexlab.com/tools/network/graphql-explorer): Paste a GraphQL schema and build queries interactively
- [SSL Certificate Checker](https://devhexlab.com/tools/network/ssl-checker): Enter a domain and see its SSL certificate details and expiry date

### Converters

Convert between measurement units, number bases (binary, octal, hex, decimal), temperature scales, file-size notations, and more. Accurate, instant conversions for engineering calculations, data work, and the everyday questions that come up while coding.

- [Number Base Converter](https://devhexlab.com/tools/converters/number-base-converter): Convert numbers between decimal, binary, octal, and hexadecimal
- [Roman Numeral Converter](https://devhexlab.com/tools/converters/roman-numeral-converter): Convert between Arabic numbers and Roman numerals instantly
- [Temperature Converter](https://devhexlab.com/tools/converters/temperature-converter): Convert temperatures between Celsius, Fahrenheit, and Kelvin
- [Unit Converter](https://devhexlab.com/tools/converters/unit-converter): Convert length, weight, area, and speed across all major units
- [Currency Formatter](https://devhexlab.com/tools/converters/currency-formatter): Format any number as a currency for any country and locale
- [Bytes / KB / MB / GB Converter](https://devhexlab.com/tools/converters/bytes-converter): Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes
- [Unit Converter](https://devhexlab.com/tools/converters/unit-converter): Convert between length, weight, temperature, area, volume, speed, data size, and time units instantly