Free online code formatter, beautifier, validator & converter
Online Code Formatter & Developer Tools
Format, validate, minify and convert JSON, XML, HTML, CSS, JavaScript and SQL — 781 free tools, fast and private.
Popular tools
.env to JSON Converter
Convert .env (dotenv) files to JSON: handles quotes, export, comments, multi-line values and ${VAR} expansion.
Base64 Decode
Decode Base64 to text online. Handles UTF-8, URL-safe Base64, missing padding and binary data downloads.
Base64 Encode
Encode text or files to Base64 online. UTF-8 safe, with URL-safe alphabet and MIME line wrapping options.
Chmod Calculator
Convert Linux file permissions between octal (755) and symbolic (rwxr-xr-x) with checkboxes, including setuid, setgid and sticky bits.
CIDR / Subnet Calculator
Calculate network, broadcast, netmask, wildcard, host range and host count for any IPv4 or IPv6 CIDR block.
Color Contrast Checker (WCAG)
Check the WCAG 2 contrast ratio of text and background colours for AA and AAA, preview it live and get the closest passing colour.
Color Palette Generator
Generate colour palettes from a base colour with harmony rules (complementary, triadic, analogous…) or at random, lock favourites and export CSS.
Content Security Policy Evaluator
Parse a Content-Security-Policy header and flag risky directives such as unsafe-inline, wildcards, missing object-src and base-uri.
Cron Expression Parser
Translate cron expressions into plain English and list the next 10 run times. Supports macros, seconds fields and Quartz syntax.
Crontab Generator
Build a crontab line from presets or custom fields, with a plain-English explanation and a preview of the next run times.
CSS Box Shadow Generator
Design layered CSS box-shadows with sliders for offset, blur, spread, colour and opacity. Supports inset shadows, presets and a Tailwind class.
CSS Formatter
Beautify or minify CSS online. Expand compressed stylesheets into readable rules.
CSS Gradient Generator
Create linear, radial and conic CSS gradients visually with draggable colour stops, presets and a live preview, then copy the CSS or Tailwind class.
CSV to JSON Converter
Convert CSV to JSON online for free. Get formatted JSON with types detected automatically.
cURL to PHP Guzzle Converter
Convert curl commands to PHP Guzzle requests using json, form_params, multipart, query and auth options.
Delete PDF Pages
Remove pages from a PDF: click the thumbnails or type page numbers, then download the shorter file. Deleted pages are fully removed. No upload.
Latest developer guides
All guides
How to Split and Merge PDF Files, Reorder, Rotate and Delete Pages
A practical guide to split and merge PDF jobs: range syntax with a worked example, merge order, duplex scan fixes, lossless rotation, deleting pages for real, and what each operation keeps.
How to Remove Personal Information from Word, Excel and PowerPoint Files
What Office files record about you, where it sits inside a .docx, and how to remove personal information from Word, Excel and PowerPoint files without touching their content.
How to Compare Two PDF Files and Find Every Text Change
How to compare two PDF files by their text, why re-flowed lines show up as false changes, what a text diff cannot see, and a review workflow for contracts, policies and theses.
.env to YAML Converter
Base64 to YAML
CSV to YAML Converter
Docker Run to Docker Compose
HTML Table to YAML Converter
JSON to YAML Converter
Properties to YAML Converter
SQL to YAML Converter
TOML Formatter
TOML to YAML Converter
TOML Validator
XML to YAML Converter
YAML Beautifier
YAML Converter
YAML Editor
.htaccess Redirect Generator
Angular Formatter
BBCode to HTML Converter
BBCode Viewer
Broken Link Checker
Code Syntax Highlighter
Content Security Policy Evaluator
CSV to HTML Table Converter
Excel to HTML Table Converter
Favicon Generator
Handlebars / Glimmer Formatter
Hreflang Tag Generator
HTML Color Names
HTML Decode
HTML Encode
CMYK to HEX Converter
Color Contrast Checker (WCAG)
Color Mixer
Color Palette Generator
CSS Animation Generator
CSS Background Pattern Generator
CSS Border Radius Generator
CSS Box Shadow Generator
CSS Button Generator
CSS Clamp Generator (Fluid Typography)
CSS Clip Path Generator
CSS Cubic Bezier Generator
CSS Filter Generator
CSS Flexbox Generator
CSS Formatter
API Tester (REST Client)
Babel Formatter
Flow Formatter
GraphQL to TypeScript
HTML to JSX Converter
JavaScript Escape
JavaScript Formatter
JavaScript Key Code Finder
JavaScript Minifier
JavaScript Obfuscator
JavaScript Pretty Print
JavaScript Tester
JavaScript Unescape
JavaScript Validator
JSON Schema to TypeScript
Bcrypt Hash Checker
Color Contrast Checker (WCAG)
Content Security Policy Evaluator
Credit Card Validator
CSS Validator
Email Address Validator
HTML Validator
IBAN Validator
ISBN Validator & Converter
JavaScript Validator
JSON Fixer & Repair
JSON Formatter
JSON Schema Validator
JSON Validator
JSON5 Validator
.env to JSON Converter
.env to YAML Converter
BBCode to HTML Converter
BMP to JPG Converter
BMP to PNG Converter
CSS to LESS Converter
CSS to SASS Converter
CSS to SCSS Converter
CSS to Stylus Converter
CSV Converter
CSV to Excel Converter
CSV to HTML Table Converter
CSV to JSON Converter
CSV to Multi-line Data Converter
CSV to PDF Converter
Adler-32 Hash Generator
Argon2 Hash Generator
ASN.1 Decoder
Bcrypt Hash Checker
Bcrypt Hash Generator
BLAKE2b Hash Generator
BLAKE2s Hash Generator
BLAKE3 Hash Generator
Checksum Calculator
CRC-16 Hash Generator
CRC-32 Hash Generator
CSR Decoder
CSR Generator
DER to PEM Converter
ECDSA & Ed25519 Key Generator
Add Line Numbers
Add Prefix and Suffix to Lines
Alphabetical Order
ASCII Art Text Generator (FIGlet)
Atbash Cipher
Caesar Cipher Encoder / Decoder
Case Converter
CSV to Multi-line Data Converter
Delimited Text Extractor
Diff Checker - Compare Text
Email Address Validator
Email Extractor
Flesch-Kincaid Grade Level Calculator
Font Generator (Fancy Text)
HTML Stripper
CMYK to Colortone Converter
CMYK to HEX Converter
CMYK to HSL Converter
CMYK to HSV Converter
CMYK to RGB Converter
CMYK to RGBA Converter
Color Blindness Simulator
Color Contrast Checker (WCAG)
Color Converter
Color Mixer
Color Name Finder
Color Palette Generator
Colortone to CMYK Converter
Colortone to HEX Converter
Colortone to HSV Converter
Angle Converter
Area Converter
Astronomical Distance Converter
Data Size Converter (Bytes / Bits)
Density Converter
Electric Current Converter
EM to PX Converter
Energy Converter
Force Converter
Frequency Converter
Fuel Economy Converter
Inches to Pixels Converter
Length Converter
Mass Converter
Pixels to Inches Converter
Binary to IP Converter
CIDR / Subnet Calculator
Decimal to IP Converter
DNS Lookup
Hex to IP Converter
Hostname to IP
HTTP Request Headers Viewer
IP Address Lookup
IP to Binary Converter
IP to Decimal Converter
IP to Hex Converter
IP to Hostname
IP to Octal Converter
IPv6 to Binary Converter
MX Lookup
ASCII Art Text Generator (FIGlet)
ECDSA & Ed25519 Key Generator
JSON Schema to Sample JSON
Lorem Ipsum Generator
Memorable Password Generator
MongoDB ObjectId Generator
Nano ID Generator
Password Generator
Password Strength Checker
Placeholder Image Generator
Random Alphanumeric Generator
Random Binary Generator
Random Byte Generator
Random Color Generator
Random CSV Generator
Barcode Generator
Base64 to Image
BMP to JPG Converter
BMP to PNG Converter
EXIF Remover (Strip Photo Metadata)
EXIF Viewer
Extract Images from PDF
Favicon Generator
Flip Image (Mirror)
GIF to BMP Converter
GIF to JPG Converter
GIF to PNG Converter
HEIC to JPG Converter
Image Compressor
Image Cropper
.htaccess Redirect Generator
Broken Link Checker
Hreflang Tag Generator
Mailto Link Generator
Meta Tag Generator
Open Graph & Twitter Card Preview
Robots.txt Generator
SERP Snippet Preview & Meta Length Checker
URL Extractor
URL Slug Generator
UTM Campaign URL Builder
WhatsApp Link Generator
XML Sitemap Generator
.env to JSON Converter
API Tester (REST Client)
Area Chart Maker
ASN.1 Decoder
Bar Graph Maker
Barcode Generator
Basic Auth Header Generator
Bcrypt Hash Generator
Broken Link Checker
Checksum Calculator
Chmod Calculator
CIDR / Subnet Calculator
Code to ASCII
Content Security Policy Evaluator
Credit Card Validator