64+ tools · free · no sign-up
The developer toolkit that just works
Format, validate, convert, compare and run code in one place. Premium tools with a clean interface, built for everyday engineering work.
Developer Tools
Format, minify, validate, view, encode and decode JSON, HTML, CSS, JavaScript, TypeScript, PHP, SQL, XML, JWT and more. Everything runs locally in your browser.
JSON Formatter
Format and beautify JSON with configurable indentation and optional key sorting. Errors are reported with exact line and column.
HTML Formatter
Beautify messy or minified HTML into clean, indented markup using Prettier, right in your browser.
CSS Formatter
Format CSS, SCSS and Less stylesheets into readable, consistently indented code.
JavaScript Formatter
Beautify JavaScript and JSX with Prettier. Choose indentation, quotes and semicolons.
TypeScript Formatter
Format TypeScript and TSX code with Prettier, including types, generics and decorators.
PHP Formatter
Beautify PHP code following PSR-style formatting with the Prettier PHP plugin.
Diff Checker
Compare two texts or code files side by side. Added, removed and modified lines are highlighted with inline word changes. Copy or download the unified diff.
Online Compilers
Write and run JavaScript, TypeScript, Python and PHP online. Code executes in isolated sandboxes, never on our web servers.
JavaScript Compiler
Run JavaScript online in an isolated browser sandbox. See console output, errors and execution time instantly.
TypeScript Compiler
Compile and run TypeScript online. Types are stripped and the result executes in a sandboxed worker.
Python Compiler
Run Python 3 online using a WebAssembly sandbox with the standard library. Supports stdin input.
PHP Compiler
Run PHP 8 code online. Execution happens in an isolated sandbox server, never on the web host.
Converters
Convert between JSON, CSV, XML, YAML, PHP arrays, TypeScript interfaces, SQL and more with validation and downloadable results.
JSON to CSV
Convert JSON arrays to CSV with automatic column detection, nested object flattening and custom delimiters.
CSV to JSON
Convert CSV to a JSON array with header detection, type inference and delimiter auto-detection.
JSON to XML
Convert JSON to well-formed XML with a configurable root element and attribute support.
XML to JSON
Convert XML to JSON, preserving attributes and repeated elements as arrays.
JSON to YAML
Convert JSON to clean, human-readable YAML.
YAML to JSON
Convert YAML documents to formatted JSON with syntax validation.
Generators
Create professional email signatures from ready-made templates, and generate secure passwords, UUIDs, QR codes, lorem ipsum, hashes, meta tags and CSS gradients.
Email Signature Generator
Create a professional email signature from ready-made templates, or paste your own HTML. Copy it into Gmail, Outlook or Apple Mail, or download the HTML.
Password Generator
Generate strong, cryptographically secure passwords with custom length, character sets and strength meter.
UUID Generator
Generate UUID v4 and time-ordered UUID v7 identifiers in bulk, with formatting options.
Large CSV Generator
Generate up to 1,000 rows of realistic sample data — names, emails, phones, companies, addresses — and download as CSV or Excel (.xlsx).
QR Code Generator
Create QR codes for websites and text. Custom size and colours, error correction, live preview, and PNG or SVG download.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes and HMACs of any text.
Time & Date
See the current time anywhere, convert between time zones with correct daylight saving handling, and convert Unix timestamps.
World Clock
Compare the current time in any two time zones, with UTC offsets, time difference and daylight saving changes.
Time Zone Converter
Convert a date and time between time zones with correct daylight saving handling, including gaps and overlaps.
Unix Timestamp Converter
Convert Unix epoch timestamps (seconds or milliseconds) to dates and back, in any time zone.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, days, hours and business days.
Why Devtoolry
Private by default
Formatting, conversion and generation run in your browser. Nothing is uploaded.
Fast and focused
Each tool loads only the code it needs, with a distraction-free editor.
Sandboxed execution
Compilers run in isolated workers or sandboxes, never on our web servers.