Developer Tools
Free, client-side developer utilities. No signup, no data sent anywhere.
Validate your .env files
Check for syntax errors, deprecated variables, and production readiness.
Formatters
JSON Formatter & Validator
Format, prettify and validate JSON data online. Free JSON formatter with syntax checking.
SQL Formatter
Format and beautify SQL queries online. Uppercase keywords, indent clauses for readability.
Markdown Preview
Preview Markdown as HTML in real time. Live markdown renderer for documentation and notes.
CSS Minifier / Beautifier
Minify and beautify CSS online. Reduce file size by removing whitespace and comments.
Encoders & Decoders
Base64 Encode / Decode
Encode and decode Base64 and Base64URL strings online. Toggle between standard Base64 and URL-safe Base64URL with real-time conversion.
URL Encode / Decode
Encode and decode URLs online. Percent-encoding and decoding for query strings.
JWT Debugger
Decode, inspect and verify JSON Web Tokens. View claims with OIDC descriptions, verify signatures with HS256/RS256/ES256, and auto-fetch public keys from OIDC issuers.
HTML Entity Encode / Decode
Encode and decode HTML entities online. Escape and unescape HTML characters.
Image to Base64 Converter
Convert images to Base64 data URIs online. Drag and drop or upload any image to get Base64 encoded output.
Generators
UUID Generator
Generate random UUIDs (v4) online. Bulk UUID generation with one click.
Hash Generator
Generate SHA-1, SHA-256, and SHA-512 hashes online. Free cryptographic hash tool.
Lorem Ipsum Generator
Generate lorem ipsum placeholder text online. Choose paragraphs, sentences or words.
Password Generator
Generate strong, random passwords and passphrases online. Strength meter, configurable character sets, and word-based passphrase mode.
QR Code Generator
Generate QR codes from any text or URL online. Download as PNG or SVG.
.gitignore Generator
Generate .gitignore files for any language or framework. Select from Node.js, Python, Go, Rust, Java, and more.
Dockerfile Generator
Generate Dockerfiles for Node.js, Python, Go, Rust, and more. Multi-stage build support.
JWT Generator
Create and sign JSON Web Tokens with custom claims online. Supports HS256, HS384, and HS512 algorithms.
Converters
Unix Timestamp Converter
Convert Unix timestamps to dates and back. UTC and local time support.
Color Converter
Convert colors between HEX, RGB, and HSL formats online.
Number Base Converter
Convert numbers between decimal, hexadecimal, octal and binary online.
Text Case Converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, UPPER, lower, Title and Sentence case.
YAML ↔ JSON Converter
Convert YAML to JSON and JSON to YAML online. Instant bidirectional conversion.
JSON to TypeScript
Convert JSON objects to TypeScript interfaces and types online. Instant type generation.
cURL to Code Converter
Convert cURL commands to Python, JavaScript, Go, PHP, and Ruby code. Free online cURL converter.
JSON to CSV Converter
Convert JSON arrays to CSV and CSV to JSON online. Handles nested objects with automatic flattening.
Markdown to HTML Converter
Convert Markdown to HTML with live preview. Free online Markdown to HTML converter.
HTML to Markdown Converter
Convert HTML to clean Markdown online. Handles headings, lists, links, images, code blocks, and tables.
TOML / JSON / YAML Converter
Convert between TOML, JSON, and YAML formats online. Bidirectional config file converter.
Testers
Regex Tester
Test and debug regular expressions online. Highlight matches and capture groups.
Diff Checker
Compare two text blocks and highlight differences online. Free text diff tool.
Cron Expression Parser
Parse and explain cron expressions online. View next run times and human-readable descriptions.
JSONPath Tester
Test JSONPath expressions against JSON data online. Live results with example expressions.
Utilities
Word Counter
Count words, characters, sentences, and paragraphs online. Estimate reading time.
IP Subnet Calculator
Calculate IPv4 subnets, split networks into subnets, plan address space with visual binary breakdown and exportable subnet plans.
DNS Lookup
Look up DNS records for any domain. Query A, AAAA, MX, TXT, NS, and CNAME records using DNS-over-HTTPS.
Chmod Calculator
Visual file permission calculator. Convert between symbolic (rwxr-xr-x) and octal (755) notation.
CSV Viewer & Editor
View CSV files as sortable tables online. Paste or upload CSV data with column sorting.
HTTP Header Analyzer
Analyze HTTP response headers for security issues. Checks HSTS, CSP, X-Frame-Options, and more.