Developer Tools for Real Work
High-performance, privacy-first developer utilities. Format JSON, decode JWTs, verify WCAG contrast, test regular expressions, and generate test data without sending a single byte to external servers.
Featured Developer Tools
JSON Formatter & Validator
Format, validate, beautify, and minify JSON with precise syntax error line and column detection.
JSON Minifier & Compressor
Minify and compress JSON strings by stripping all whitespace, newlines, and unnecessary indentation for production payloads.
JSON Diff & Comparator
Compare two JSON objects side-by-side with line-by-line semantic diffing and structural highlighting.
JSON to CSV Converter
Convert JSON arrays or objects into clean, RFC 4180-compliant CSV files with quote escaping.
CSV to JSON Converter
Parse CSV files and strings into typed, formatted JSON arrays of objects with automatic type inference.
JSON to YAML Converter
Convert JSON payloads into clean, readable YAML with customizable 2-space or 4-space indentation.
YAML to JSON Converter
Parse YAML configurations into formatted or minified JSON with full support for YAML 1.2 syntax.
XML Formatter & Beautifier
Beautify, indent, and format XML documents with tag balancing validation.
YAML Formatter & Beautifier
Format and validate YAML files with strict indentation and syntax error diagnostics.
Base64 Encoder & Decoder
Encode plain text to Base64 or decode Base64 strings with complete UTF-8 character support.
URL Encoder & Decoder
Percent-encode or decode query parameters and URLs with standard or strict encoding.
HTML Entity Encoder & Decoder
Convert special HTML characters (&, <, >, ", ') into HTML entities or decode them.
JWT Inspector & Decoder
Decode JSON Web Tokens (JWT) locally to inspect header, payload claims, and expiration dates.
Regular Expression Tester & Debugger
Test regular expressions in real-time with ReDoS timeout protection, match highlighting, and capture groups.
Unix Timestamp Converter
Convert between Unix epoch timestamps (seconds/milliseconds) and human-readable dates with timezone previews.
Cron Expression Translator & Validator
Parse, validate, and translate standard 5-part cron expressions into plain English with upcoming run schedules.
SQL Formatter & Beautifier
Format and beautify complex SQL queries across PostgreSQL, MySQL, SQLite, and Transact-SQL dialects.
HTTP Status Code Directory
Searchable reference directory of HTTP status codes (2xx, 3xx, 4xx, 5xx) with RFC descriptions.
CIDR Subnet & Usable IP Calculator
Calculate network address, broadcast address, netmask, and usable host IP ranges from CIDR notation.
Cryptographic Password Generator
Generate cryptographically strong passwords using crypto.getRandomValues() with custom length and character sets.
Diceware Passphrase Generator
Generate memorable, high-entropy multi-word passphrases using the official EFF Diceware wordlist.
API Key & Bearer Token Generator
Generate high-entropy 32, 64, or 128-byte tokens in Hex, Base64, or URL-safe Base64 for API keys.
UUIDv4 Generator & RFC 4122 Validator
Generate cryptographically random RFC 4122 Version 4 UUIDs or validate and inspect existing UUID strings.
Password Strength & Entropy Auditor
Audit password strength, Shannon entropy bits, character diversity, and vulnerability to common dictionary attacks.
Multi-Algorithm Hash Generator
Compute cryptographic hashes across MD5, SHA-1, SHA-256, SHA-384, and SHA-512 simultaneously.
HMAC-SHA Signature Generator
Generate keyed-hash message authentication codes (HMAC) using SHA-256, SHA-512, or SHA-1.
Color Space Converter & Picker
Convert colors across HEX, RGB, RGBA, HSL, HSLA, HSV, and CMYK with a live color picker.
Modern CSS OKLCH Color Converter
Convert HEX and RGB colors to modern perceptual CSS oklch(L C H) color functions.
Tailwind CSS Palette Matcher & Converter
Find the closest matching default Tailwind CSS color classes (e.g. sky-600, slate-900) for any HEX code.
Harmonious Color Palette Generator
Generate complementary, analogous, triadic, tetradic, and monochromatic color palettes from a seed color.
CSS Gradient Generator
Build linear, radial, and conic CSS gradients visually with color stops, angle controls, and live previews.
WCAG Contrast Ratio Checker
Audit color contrast ratios against WCAG 2.1 & 2.2 AA and AAA standards for normal and large text.
Color Blindness Simulator
Simulate how colors appear to users with Deuteranopia, Protanopia, Tritanopia, and Achromatopsia.
Multi-Layer Box Shadow Generator
Build layered, hyper-realistic smooth CSS box shadows with up to 5 elevation layers and inset toggles.
8-Point CSS Border Radius Generator
Create organic blob shapes and asymmetric corners using modern 8-value CSS border-radius syntax.
Modern Glassmorphism CSS Generator
Generate frosted glass effects using backdrop-filter blur, translucent borders, and subtle reflections.
Fluid Responsive clamp() Calculator
Calculate fluid responsive CSS clamp(min, val, max) expressions for font-size and spacing.
CSS Grid Layout Generator
Build responsive 2D CSS Grid layouts visually with repeat(), fr units, gap, and template areas.
CSS Flexbox Layout Generator
Configure flex-direction, justify-content, align-items, flex-wrap, and gap with visual item previews.
CSS Code Formatter & Beautifier
Format and beautify minified or unindented CSS stylesheets with clean rule indentation.
CSS Code Minifier
Compress CSS stylesheets by stripping comments, whitespace, and unnecessary semicolons.
CSS Responsive Layout & Media Query Generator
Generate responsive CSS layouts, modern container queries, and mobile-first media query breakpoints.
HTML Formatter & Beautifier
Format, indent, and beautify messy HTML markup with proper nesting and tag indentation.
HTML Cleaner & Deprecated Tag Stripper
Strip inline styles, deprecated tags (<font>, <center>), and unwanted attributes from HTML.
HTML to Plain Text Stripper
Strip all HTML tags and attributes to extract clean, readable plain text.
HTML Anchor & Hyperlink Extractor
Extract all <a> links, href targets, anchor text, and rel attributes from HTML markup.
Semantic HTML Table Generator
Build semantic HTML5 tables (<thead>, <tbody>, <th>, <td>) visually with customizable rows and columns.
Table-Based Responsive HTML Email Boilerplate
Generate rock-solid table-based HTML email templates compatible with Outlook, Gmail, and Apple Mail.
HTML Responsive Image & <picture> Generator
Generate accessible, responsive HTML <img> and <picture> markup with srcset, sizes, lazy loading, and WebP fallback.
Deep URL Inspector & Component Breakdown
Deconstruct URLs into protocol, hostname, port, pathname, search query parameters, and hash fragments.
Tracking Parameter & UTM Stripper URL Cleaner
Strip tracking parameters (utm_*, fbclid, gclid, msclkid, ref) from URLs for clean, privacy-safe sharing.
SEO-Friendly URL Slug Generator
Convert article titles and headlines into clean, lowercase, hyphen-separated SEO URL slugs.
Google Analytics UTM Campaign Link Builder
Generate Google Analytics 4 (GA4) campaign tracking links with utm_source, utm_medium, utm_campaign, utm_term, and utm_content.
Browser & OS User-Agent String Parser
Inspect your browser user-agent string or analyze external user-agents to detect browser, OS, and device type.
Google Search SERP Snippet Preview
Preview how your web page title, URL, and meta description look in Google Search results across desktop and mobile.
Social Sharing Open Graph Protocol Generator
Generate og:title, og:description, og:image, og:url, and og:type Open Graph meta tags for Facebook, LinkedIn, and Discord.
Crawler Directives Robots.txt Generator
Generate valid robots.txt files with User-agent, Allow, Disallow, Crawl-delay, and Sitemap directives.
XML Sitemap 0.9 Protocol Generator
Generate clean XML sitemap files conforming to the official Sitemap 0.9 protocol with changefreq and priority.
JSON-LD Schema.org Structured Data Generator
Generate truthful Google Rich Snippets structured data in JSON-LD for Articles, Products, Organizations, FAQs, and Breadcrumbs.
Content Keyword Density & Frequency Analyzer
Audit text for keyword density percentages, word frequencies, total word counts, and keyword stuffing warnings.
Word, Character, Sentence & Paragraph Counter
Count words, characters (with and without spaces), sentences, paragraphs, and estimated reading time.
Synthetic Multi-Record Developer Dataset Generator
Generate synthetic developer datasets (users, orders, products) in JSON, CSV, or SQL formats.
Lorem Ipsum Paragraph & Sentence Generator
Generate classical Latin placeholder text by paragraphs, sentences, or word counts with optional HTML markup.
Client-Side Vector QR Code Generator
Generate downloadable high-resolution QR codes locally for URLs, plain text, Wi-Fi, and contact cards.
Random Number, Integer & Decimal Generator
Generate single or batch random integers, decimals, and dice rolls with unique non-repeating options.
Custom Resolution SVG Placeholder Image Generator
Generate lightweight SVG placeholder images with custom width, height, colors, and centered dimension labels.
Synthetic Test Email Address Generator
Generate mock, test, and disposable format email addresses for QA form testing, validation, and load tests.
GUID Generator (.NET / Microsoft CLSID Format)
Generate uppercase, registry-formatted, and C# GUIDs with brackets and hyphens using cryptographic randomness.
Browse by Category
Carefully curated, specialized suites designed for specific workflows.
Developer Tools
Core programming utilities, formatters, and data converters.
Password & Security
Privacy-first cryptographic generators and security tools.
Color Tools
Color conversions, accessibility contrast, and palette generation.
CSS & Web Tools
Visual CSS generators, layout helpers, and code formatters.
HTML Tools
HTML markup formatters, sanitizers, and semantic generators.
URL & Web Tools
URL parsing, query builders, UTM generators, and HTTP codes.
SEO Tools
Search engine optimization, SERP previews, and structured data.
Generator Tools
Synthetic mock data, QR codes, and development generators.
Tool Chaining: Connected Workflows Without Context Switching
Every tool on DevUtility is architected with companion intelligence. Format a JSON payload, immediately compare it against another schema in JSON Diff, transform it to YAML or CSV, or inspect encoded tokens — all without copying and pasting between unrelated external websites.
Why Client-Side Privacy Matters
Many online tools send your private credentials, proprietary code, and sensitive customer data to remote backends. DevUtility is engineered differently.
Zero Server Transmission
Every cryptographic hash, JWT decode, regex test, and password generation runs entirely within your browser's WebAssembly and JavaScript VM. No data packets ever leave your device.
CSPRNG Randomness
All security generators use the browser's Web Crypto API (crypto.getRandomValues) rather than pseudo-random numbers, guaranteeing non-deterministic cryptographic entropy.
Privacy-Protected Analytics
Our Google Analytics setup strictly monitors aggregate tool usage. It is forbidden from receiving tool inputs, outputs, tokens, keys, passwords, or query payloads.