Browse all developer tools by category
JSON Tools
Showing 10 of 18
Format and prettify JSON with syntax highlighting
Validate JSON syntax and structure
Explore JSON data in a tree view
Convert JSON to escaped string representation
Generate or apply RFC 6902 JSON Patch operations
Compare two JSON documents and show structural differences
Test JSONPath expressions against a JSON document
Recursively sort all keys in a JSON document alphabetically
Flatten nested JSON to dot-notation or unflatten back
Minify JSON with size statistics
HTML Tools
7 tools
Format and indent HTML code
Pretty print HTML with color-coded output
Validate HTML markup and structure
Preview and inspect HTML in real-time
Minify HTML by removing whitespace and comments
Minify HTML with compression options
Strip tags, decode entities, preserve paragraph breaks
XML Tools
10 tools
Format and prettify XML documents
Minify XML by removing whitespace
View XML in a structured tree format
Pretty print XML with syntax highlighting
Validate XML syntax and well-formedness
Edit XML with real-time validation and highlighting
Parse XML and extract structured data
Format WSDL (Web Services Description Language) files
Format SOAP XML messages
Validate XML against basic XSD schema rules
YAML Tools
6 tools
Validate YAML syntax and structure
View YAML in a structured tree format
Format and prettify YAML documents
Parse YAML and extract structured data
Split a multi-document YAML file into separate documents
Expand YAML anchors and aliases into plain YAML
CSS Tools
Showing 10 of 49
Minify CSS by removing whitespace and comments
Beautify and format CSS code
Format CSS with proper indentation
Pretty print CSS with color coding
Convert CSS to LESS preprocessor syntax
Convert CSS to SCSS preprocessor syntax
Convert CSS to SASS syntax
Convert CSS to Stylus syntax
Convert Stylus to standard CSS
Convert Stylus to LESS syntax
JavaScript Tools
7 tools
Beautify and format JavaScript code
Pretty print JavaScript with syntax highlighting
Compress JavaScript by stripping whitespace, comments, and redundant syntax
Searchable reference: variables, async, classes, DOM, fetch, gotchas, ES2020–2024
Turn a variable name into ready-to-paste console.log/table/group/dir statements
Resolve a dotted/bracket path against a JSON object — like lodash.get
Check whether a name passes npm's publish rules (length, casing, reserved prefixes)
Converters Tools
Showing 10 of 48
Convert JSON data to XML format
Convert JSON array to CSV format
Convert JSON to YAML format
Convert JSON array to Tab-Separated Values
Convert JSON to escaped string format
Convert XML to JSON format
Convert XML data to CSV format
Convert XML to escaped string
Convert XML to YAML format
Convert RSS/Atom feed to JSON format
Images Tools
Showing 10 of 39
Download standard-size placeholder images or generate a custom size
Convert images between PNG, JPEG, WebP and more
Convert multiple images at once to a chosen format
Crop, annotate, draw, and add text to images
Calculate aspect ratios and resize dimensions proportionally
Minify and clean SVG markup by removing metadata and comments
Generate a favicon pack from a single image or emoji
Browse and download curated placeholder images
Create initials-based SVG avatars from a name
Show EXIF / IPTC / XMP metadata from JPEG, PNG, HEIF
Text / String Tools
Showing 10 of 62
Encode strings for safe URL usage
Decode percent-encoded URL strings
Convert characters to HTML entities
Convert HTML entities back to characters
Decode and inspect JWT token header and payload
Generate placeholder text in words, sentences, or paragraphs
Count words, characters, sentences, paragraphs, and reading time
Compare two text blocks and highlight differences
Convert between camelCase, snake_case, PascalCase, kebab-case, and more
Sort lines alphabetically, numerically, reverse, shuffle, or dedupe
Encoding Tools
Showing 10 of 12
Encode text or files to Base64
Decode Base64 back to text or file
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text
Convert between decimal, hex, octal, and binary
Convert between Unix epoch, ISO 8601, and human-readable dates
Encode and decode text in Base58, Base32, or Base85
Encode URL-safe base64 — + → - , / → _ , no padding
Decode URL-safe base64 back to UTF-8 text
Convert UTF-8 text to 0/1 binary — or decode back
Encode UTF-8 text to hexadecimal bytes — or decode hex back to text
Generators Tools
Showing 10 of 47
Generate v4 UUIDs — single or bulk
Generate sortable ULIDs (Universally Unique Lexicographically Sortable IDs)
Generate secure random passwords with custom rules
Convert cURL commands to fetch, axios, Python requests, and more
Describe cron expressions in plain English with next run times
Format and prettify SQL queries
Format and prettify GraphQL queries and schemas
Generate JSON Schema from a sample JSON object
Generate TypeScript interfaces from JSON data
Generate fake names, emails, addresses, and more in JSON or CSV
Color Tools
Showing 10 of 23
Convert between HEX, RGB, HSL, OKLCH, and Tailwind colors
Generate complementary, analogous, and triadic color palettes
Check WCAG AA/AAA contrast ratio between two colors
Design CSS/SVG gradients and export as CSS, SVG, or Figma tokens
Test WCAG contrast ratios for every color pair in a palette
Map a hex/rgb color to the nearest Tailwind class
Translate a CSS gradient into SwiftUI, Android, and Flutter code
Find the closest CSS named color to any hex (Euclidean in RGB)
Complementary, analogous, triadic, tetradic & split-comp schemes from a base color
Full Tailwind CSS v3 color palette — 18 families × 11 shades, searchable
Networking Tools
Showing 10 of 28
Parse and validate IPv4/IPv6 addresses and CIDR ranges
Quick lookup of HTTP status codes and their meanings
Explain A, AAAA, CNAME, MX, TXT, SRV and other DNS records
Decode WebSocket frame headers and payloads from hex
Look up common services for any TCP/UDP port number
Convert between file extensions and MIME types
Decode X.509 PEM certificates into readable fields
Generate HTTP Public Key Pinning headers from a certificate
Parse browser, OS, device from a User-Agent string
Analyze CORS response headers for misconfigurations and security issues
PDF Tools
Showing 10 of 19
Download ready-made sample PDFs of various sizes and page counts
Merge multiple PDFs into a single document
Split a PDF by page ranges
Reduce PDF file size in the browser
Write or paste Markdown and export it as a downloadable PDF
Create professional invoices from line items and export as PDF
Convert a plain text file into a downloadable PDF
Paste HTML or upload an .html file and export as PDF
Convert a Word .docx document into a PDF
Convert an OpenDocument Text file into a PDF
API / Config Tools
Showing 10 of 31
Lightweight REST client — collections, env vars, history, format converter (cURL / Collection JSON / REST Handler YAML)
Browse endpoints, schemas, and operations from an OpenAPI 3 spec
Convert an OpenAPI / Swagger spec into a Collection JSON v2.1 payload
Detect duplicate dependencies and common issues
Check Dockerfiles against common best practices
Validate required fields in Kubernetes YAML manifests
Generate stub responses from a JSON Schema
Build HTTP requests with headers, auth, and body — preview and execute
Interactive GraphQL query builder with schema introspection and execution
View and test gRPC proto definitions — service inspection and message generation
Date / Time Tools
Showing 10 of 14
Convert a date-time between multiple timezones
Calculate the duration between two dates or times
Calculate exact age in years, months, and days from a birthdate
Count business days between two dates (excluding weekends)
Find the ISO week number for any date
Add/subtract days, weeks, months, years with weekday result
Explain a cron expression in English + show the next 5 run times
Show the same instant in ISO, RFC-2822, epoch, DD/MM/YYYY and more
Build a live <div>-and-JS countdown to any ISO target timestamp
Plan a 25/5 Pomodoro session with long break — outputs a timeline
Security / Crypto Tools
Showing 10 of 42
Generate cryptographic hashes with streaming
Generate HMAC with multiple algorithms
Encode a JWT token from header, payload, and secret
Generate bcrypt hashes and verify passwords against hashes
Generate HMAC signatures using SHA-256, SHA-512, and more
Analyze password strength with entropy and crack-time estimates
Generate time-based one-time passwords from a secret key
Decode Base64-encoded SAML responses into readable XML
Generate PKCE parameters with S256/plain support, state, and nonce. Includes OAuth flow examples
Calculate the fingerprint of an SSH public key
Web / Frontend Tools
Showing 10 of 42
Preview how meta tags and OpenGraph data appear on social platforms
Convert Tailwind CSS classes to vanilla CSS properties
Convert HTML to valid React JSX syntax
Convert HTML content to Markdown format
Convert SVG markup into a React component
Convert between 14+ CSS units: px, rem, em, vw, vh, vmin, vmax, pt, cm, mm, in, %, ch, ex
Validate robots.txt syntax and check for common issues
Validate sitemap.xml structure and check for common issues
Validate RSS 2.0 and Atom feed XML structure
Generate CSS box-shadow values from parameters
Data / SQL Tools
Showing 10 of 33
View CSV data in a sortable, filterable table
Generate SQL INSERT statements from CSV data
Convert SQL INSERT statements to CSV format
Convert between tab-separated and comma-separated values
Validate CSV data against a column schema definition
Convert SQL CREATE TABLE statements to Prisma schema
Rename, reorder, or drop columns in CSV data
Validate CSV data against column type definitions
Convert SQL identifiers between snake, camel, and Pascal case
Pull the Nth whitespace-delimited column from each line
Database Tools Tools
10 tools
Build MongoDB queries with aggregation pipelines and operations
Build Elasticsearch queries with filters and aggregations
Simulate Redis commands and data structure operations
Build Cassandra CQL queries with advanced operations
Simulate DynamoDB scan and query operations with expressions
Build Firestore queries with constraints and filters
Explore graph databases with Cypher and Gremlin queries
Score and rank search results by relevance to query
Analyze full-text search tokenization and analysis
Analyze database indexing strategies and recommendations
AI / Modern Dev Tools
8 tools
Estimate token count for OpenAI and Anthropic models
Render prompt templates with variable substitution
Convert Markdown to Slack mrkdwn or Discord formatting
Calculate cosine similarity between two text embedding vectors
Convert GitHub-flavor markdown to Slack's mrkdwn
Analyze sentiment (positive/negative/neutral) of text
Extract keywords and phrases from text content
Summarize long text by extracting key sentences
Fun / Niche Tools
Showing 10 of 30
Search emoji by name and show Unicode codepoints
Convert text to NATO phonetic alphabet or decode NATO words back to letters
Convert text to Morse code and back with audio playback and speed control
Convert between Roman numerals and decimal numbers (1–399999). Supports vinculum notation with underscores for values 4000+
Convert numbers to words in English, Spanish, or French. Supports cardinals (one, two) and ordinals (first, second)
Convert text to/from 1337 speak
Generate URL-friendly slugs from text
Find and highlight invisible zero-width characters in text
Replace curly/smart quotes with straight quotes and vice versa
Calculate similarity between two text strings (Levenshtein, Jaccard)
Developer Utilities Tools
Showing 10 of 60
Convert Collection JSON v2.1 requests into cURL one-liners
Convert unified git diff output to syntax-highlighted HTML
Visualize regex patterns as a readable railroad diagram (text)
Parse a Makefile and explain each target and its dependencies
Check shell scripts for common issues and bad practices
Parse a GitHub Actions workflow and show job/step dependencies
Parse and summarize HTTP Archive (HAR) files
Generate mock API JSON responses from a URL + method description
Generate GraphQL queries from a schema definition
Generate TypeScript interfaces from an OpenAPI schema
Game Dev Tools
Showing 10 of 19
One 1024² PNG → every Unity Player-Settings icon size (iOS / Android / Standalone / WebGL)
Adaptive foreground+background, every mipmap-dpi bucket, Play Store 512, ic_launcher.xml
Every iPhone / iPad / App-Store icon size with @1x/@2x/@3x labels + Contents.json
Generate Unity MonoBehaviour, ScriptableObject, or Editor scripts from a template
Parse and display Unity .prefab YAML structure in a readable format
Calculate frame dimensions, UV coords, and animation timing from sprite sheet parameters
Calculate vectors, distances, dot products, lerp, and common game math operations
Generate game-ready color palettes with hex, RGB, and normalized float values
Generate 2D tilemap arrays for grid-based games from a visual text grid
Calculate RPG damage with attack, defense, crit, elemental modifiers
Animation / CSS Tools
10 tools
Generate @keyframes animations from step definitions
Generate CSS-only loading spinners and progress indicators
Generate shimmer skeleton placeholder CSS for loading states
Generate CSS hover effects for buttons, cards, and links
Build and preview CSS transitions with property, duration, and easing controls
Generate typewriter, fade-in, bounce, and other text animations
Generate CSS scroll-triggered animation code with IntersectionObserver
Generate CSS-only particle animations (confetti, snow, stars)
Generate animated gradient backgrounds with CSS
Generate animated button styles with ripple, glow, and morphing effects
Calculators Tools
Showing 10 of 73
Evaluate math expressions with +, -, *, /, parentheses, and functions
Calculate percentages, discounts, tips, and markup
Convert length, weight, temperature, speed, and data units
Calculate monthly payments, total interest, and amortization
Any number → grouped, compact, scientific, hex, binary, percent
Calculate tip + per-person split — US-style 15/18/20/22% presets
Calculate body mass index with WHO categories — metric or imperial
Monthly payment + total interest for any loan amount, rate, term
Future value with configurable compounding + monthly contributions
Final price after % off — plus total savings — for quick shopping math
Audio Tools
4 tools
Cheatsheets Tools
Showing 10 of 24
Everyday Git commands — setup, commit, branch, remote, undo
Docker + Compose commands for images, containers, volumes, Dockerfile
Rules, variables, functions, pattern matching, advanced features
Character classes, quantifiers, anchors, groups, flags
CommonMark + GitHub-flavored Markdown syntax at a glance
Modal editing essentials — modes, motions, edits, files
Navigation, text processing, pipes, processes, scripting basics
SELECT, JOIN, aggregates, window functions, upsert
Inspect, logs, apply, scale, context switching for Kubernetes
Install, run, audit across all three package managers
Info / Guides Tools
Showing 10 of 29
What containers are, why they're useful, first run, common pitfalls
Technical SEO, on-page signals, structured data, what to skip
HTTP verbs, status codes, resource naming, common gotchas
File conventions, server vs client, data fetching, snags
Search Console, GA4, Tag Manager, Ads — end-to-end setup order
Mental model, first workflow, daily loop, undo cookbook
Pods, deployments, services, YAML, when to reach for k8s
When each wins, and the hidden costs of GraphQL at scale
Lifecycle, browser API, when to use, production gotchas
Auth code + PKCE, client credentials, device, token types, scopes
DevOps / CI-CD Tools
Showing 10 of 20
Build CI/CD pipeline configurations for GitHub, GitLab, Jenkins, and more
Generate GitHub Actions workflow YAML with triggers and jobs
Generate GitLab CI pipeline configurations with stages and jobs
Simulate Jenkins Declarative Pipeline execution with stages and results
Build CircleCI configuration files with workflows and jobs
Simulate Travis CI build scenarios with language matrix and deploy settings
Analyze code coverage reports with trends and file-level metrics
Check dependencies for security vulnerabilities and outdated packages
Verify project dependencies comply with approved open-source licenses
Analyze bundle size, build metrics, and optimization recommendations
Diagrams & Workflows Tools
Showing 10 of 15
Generate system architecture diagrams with components, services, and data flows
Generate database schema diagrams with tables, relationships, and field definitions
Generate sequence diagrams showing interaction flows between components and actors
Generate ER diagrams with entities, attributes, and relationship cardinality
Generate deployment architecture diagrams with infrastructure, services, and cloud components
Generate flowcharts from text descriptions with decision nodes, processes, and flows
Create mind maps from topic outlines with hierarchical structure and branches
Generate timelines from event descriptions with dates and milestones
Create Gantt charts for project planning with tasks, dependencies, and duration
Simulate kanban board workflows with columns, card movement, and WIP limits
Statistics Tools
10 tools
Calculate A/B test results and statistical significance
Test statistical significance of two samples
Calculate confidence intervals for population parameters
Calculate required sample size for statistical tests
Test chi-square statistics for categorical data
Calculate t-test results for comparing means
Analyze correlation between variables
Analyze regression models and coefficients
Analyze probability distributions and statistics
Test statistical hypotheses with detailed results
Career & Professional Tools
10 tools
Plan career progression with milestones, skills, and timeline
Calculate salary negotiation ranges based on market data and experience
Analyze and compare job offers with detailed scoring and benefits breakdown
Optimize resume keywords for applicant tracking systems (ATS)
Plan interview preparation with timeline, question strategies, and practice tips
Analyze skill gaps for target roles and create development roadmap
Plan professional networking activities and relationship building strategy
Calculate freelance rates based on experience, market rates, and project complexity
Estimate side hustle income potential with time and cost projections
Evaluate personal brand strength with detailed assessment and improvement recommendations
Event Planning Tools
10 tools
Calculate event timelines, tasks, and budget allocations
Plan and track wedding expenses across all categories
Plan parties with guest counts, food, drinks, and decoration estimates
Calculate venue space requirements based on event type and guest count
Calculate catering quantities, portions, and costs for events
Generate optimal seating arrangements for events
Create detailed event timelines with tasks and milestones
Manage guest lists, RSVPs, dietary restrictions, and contact information
Plan decoration budgets with itemized costs and vendor quotes
Generate comprehensive event checklists by event type and timeline
Travel Tools
10 tools
Plan travel itineraries with daily activities and budgets
Calculate flight costs with factors like class, passengers, and fees
Estimate hotel costs and booking requirements by location and rating
Plan travel budgets across flights, hotels, and daily expenses
Generate packing lists based on trip type, duration, and climate
Calculate currency exchanges and conversion rates for travel
Calculate travel distances, times, and costs between locations
Check visa requirements and documents needed by country
Calculate travel insurance costs and coverage options
Provide travel health recommendations and vaccination advice
Real Estate & Home Tools
10 tools
Calculate real estate investment metrics like ROI and cap rate
Analyze mortgage refinancing scenarios and break-even periods
Calculate property taxes with exemptions and assessments
Plan home renovation budgets with ROI estimates
Plan interior designs with budget allocation and style recommendations
Design furniture layouts for rooms with spacing recommendations
Calculate home automation equipment and installation costs
Estimate monthly and annual utility costs for homes
Calculate home insurance premiums and deductible options
Plan property maintenance schedules and reserve funds
Business & Corporate Tools
Showing 10 of 23
Generate creative business names with domain availability checks
Create detailed business plan outlines with all essential sections
Calculate total startup costs for new ventures across categories
Track and manage business licenses, permits, and renewal dates
Calculate business insurance premiums and coverage recommendations
Compare vendors and suppliers by price, quality, and terms
Build and organize supplier databases with contact and pricing info
Generate customizable contract templates for business agreements
Generate negotiation checklists and strategy guides for deals
Automate procurement processes and streamline approval workflows
Pet Care Tools
10 tools
Calculate monthly and annual pet care expenses
Estimate total cost of pet adoption and setup
Calculate daily/monthly pet food needs and costs
Track pet health records, medications, and visits
Schedule and track pet vaccination dates
Plan and track pet training programs and milestones
Schedule pet grooming appointments and track maintenance
Compare different pet breeds by characteristics and requirements
Estimate veterinary service costs and procedures
Calculate pet insurance costs and coverage options