Free Developer Tools Online
30+ tools for JSON, XML, SQL, Base64 and more – directly in your browser, no account needed.
Formatting
Format and validate JSON, XML, YAML, SQL, HTML, CSS and JavaScript beautifully.
JSON Formatter
Format, validate and minify JSON
Open ToolXML Formatter
Format, validate and minify XML
Open ToolYAML Formatter
Format, validate and convert YAML
Open ToolSQL Formatter
Format, minify and beautify SQL
Open ToolHTML Formatter
Format, minify and live preview HTML
Open ToolCSS Formatter
Format, minify and alphabetically sort CSS
Open ToolJavaScript Formatter
Format, minify and customize JavaScript
Open ToolMarkdown Preview
Type Markdown and render it as a live HTML preview
Open ToolEncoding
Base64, URL, HTML Entities – encode and decode text, generate hashes.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text
Open ToolURL Encoder / Decoder
Encode and decode URLs and URL parameters
Open ToolJWT Decoder
Decode and analyze JWT tokens
Open ToolHTML Entities Encoder / Decoder
Encode special characters to HTML entities or decode entities back to text
Open ToolHash Generator
Generate SHA-1, SHA-256 and SHA-512 hashes - using Web Crypto API
Open ToolGenerators
Create UUIDs, passwords, test data and Lorem Ipsum with one click.
UUID Generator
Generate UUIDs (v4) - single or bulk, with options
Open ToolJSON Generator
Generate random JSON data - with configurable schema
Open ToolXML Generator
Generate random XML data - with configurable schema
Open ToolTest Data Generator (German)
Generate realistic German test data - names, addresses, IBAN and more
Open ToolPassword Generator
Generate secure passwords with configurable length and character types
Open ToolLorem Ipsum Generator
Generate Lorem Ipsum placeholder text - paragraphs, sentences or words
Open ToolMeta Tag Generator
Generate meta tags for SEO, Open Graph and Twitter Cards
Open ToolRegex Generator
Generate regular expressions – with templates and visual builder.
Open ToolConverters
Convert formats: CSV to JSON, JSON to CSV, calculate bytes, convert colors.
Unix Timestamp Converter
Convert Unix timestamps to dates and vice versa
Open ToolCSV to JSON Converter
Convert CSV data to JSON - with delimiter selection and header detection
Open ToolJSON to CSV Converter
Convert JSON arrays to CSV - with automatic header detection
Open ToolColor Converter
Convert colors between HEX, RGB and HSL - with live preview
Open ToolByte Converter
Convert storage sizes between Bytes, KB, MB, GB and TB
Open ToolTesting
Test regular expressions, compare texts and explain cron expressions.
Reference
Look up HTTP status codes – all codes with clear explanations.