80+ Free Online Developer Tools

Data Converters

JSON Converter

Convert, validate, and format JSON data with ease.

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XML Converter

Transform and validate XML files quickly.

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CSV Converter

Convert CSV to JSON, XML, or other formats.

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JSON to YAML

Convert JSON to YAML format.

Try JSON to YAML

YAML/JSON Converter

Convert between YAML and JSON formats.

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XML ↔ JSON

Convert between XML and JSON.

Try XML ↔ JSON

Batch Convert (Files to PDF)

Convert multiple files (text, images, and more) to PDF in bulk and download as a single PDF.

Try Batch Convert (Files to PDF)

HTML Beautifier

Beautify and format HTML code.

Try HTML Beautifier

HTML to Markdown

Convert HTML content to Markdown format.

Try HTML to Markdown

SQL Formatter

Format and beautify SQL queries for readability.

Try SQL Formatter

Code Minifier

Minify JavaScript, CSS, and HTML code.

Try Code Minifier

Code Beautifier

Beautify and format code for better readability.

Try Code Beautifier

Base64 Encoder/Decoder

Encode or Decode Base64 instantly.

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Base64 Image Converter

Convert images to Base64 and vice versa.

Try Base64 Image Converter

URL Encoder/Decoder

Encode or decode URL strings for safe transmission.

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HTML Entity Encoder

Encode and decode HTML entities for safe display.

Try HTML Entity Encoder

ASCII Converter

Convert text to ASCII codes and vice versa.

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Unicode Converter

Convert text to Unicode code points and back.

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Number Base Converter

Convert numbers between binary, decimal, hex, and octal.

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File Size Converter

Convert between file size units (KB, MB, GB, etc.).

Try File Size Converter

PDF & Image Tools

Image to PDF

Convert images to PDF documents in seconds.

Try Image to PDF

PDF Merger

Combine multiple PDF files into a single document.

Try PDF Merger

Image Resizer

Resize and scale images to custom dimensions.

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Image Format Converter

Convert images between PNG, JPG, WebP, and more.

Try Image Format Converter

Image Compressor

Compress images to reduce file size without losing quality.

Try Image Compressor

Favicon Generator

Generate favicons from images for your website.

Try Favicon Generator

SVG Optimizer

Optimize and compress SVG files for the web.

Try SVG Optimizer

Placeholder Image

Generate placeholder images for your designs.

Try Placeholder Image

Color Palette Extractor

Extract color palettes from images.

Try Color Palette Extractor

Color Picker

Convert between HEX, RGB, and HSL color formats.

Try Color Picker

CSS Gradient Generator

Create beautiful CSS gradients with a visual editor and presets.

Try CSS Gradient Generator

Color Blindness Simulator

Preview how colors appear to people with different types of color vision deficiency.

Try Color Blindness Simulator

Generators

QR Code Generator

Generate QR codes from text or URLs instantly.

Try QR Code Generator

GUID Generator

Generate unique GUIDs/UUIDs for your applications.

Try GUID Generator

package.json Generator

Generate npm package.json files.

Try package.json Generator

Changelog Generator

Create CHANGELOG.md entries.

Try Changelog Generator

Secret Key Generator

Generate secure random keys.

Try Secret Key Generator

SSH Key Generator

Generate SSH key pairs.

Try SSH Key Generator

TOTP Generator

Generate time-based one-time passwords.

Try TOTP Generator

Dockerfile Generator

Generate Dockerfiles for your projects.

Try Dockerfile Generator

iCal Generator

Generate iCal calendar files.

Try iCal Generator

vCard Generator

Generate vCard contact files.

Try vCard Generator

Lorem Ipsum Generator

Generate placeholder text for design and development.

Try Lorem Ipsum Generator

.gitignore Generator

Generate .gitignore files for different project types and IDEs.

Try .gitignore Generator

Interactive .gitignore Builder

Search and select multiple technology stacks to build a merged, deduplicated .gitignore file.

Try Interactive .gitignore Builder

CSP Generator

Generate secure Content-Security-Policy headers for your web application.

Try CSP Generator

Date & Time

Unix Timestamp

Convert between Unix timestamps and dates.

Try Unix Timestamp

Date & Time Tools

Various date and time conversion utilities.

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Pomodoro Timer

Boost productivity with a simple Pomodoro timer.

Try Pomodoro Timer

Network & API

HTTP Header Parser

Parse and analyze HTTP headers.

Try HTTP Header Parser

User Agent Parser

Parse and analyze User Agent strings.

Try User Agent Parser

HTTP Status Codes

Reference guide for HTTP status codes.

Try HTTP Status Codes

CORS Generator

Generate CORS headers for your API.

Try CORS Generator

HTTP Request Builder

Build and send HTTP requests.

Try HTTP Request Builder

Curl Command Generator

Generate curl commands for HTTP requests.

Try Curl Command Generator

Open Graph Meta Generator

Generate Open Graph meta tags.

Try Open Graph Meta Generator

robots.txt Generator

Create robots.txt for your site.

Try robots.txt Generator

Sitemap Generator

Generate XML sitemaps.

Try Sitemap Generator

DNS Lookup

Perform DNS lookups for domain records.

Try DNS Lookup

IP Lookup

Get information about IP addresses.

Try IP Lookup

URL Parser

Parse and analyze URL components.

Try URL Parser

API Response Formatter

Format and beautify API responses.

Try API Response Formatter

WHOIS Lookup

Look up domain registration information and ownership details.

Try WHOIS Lookup

Subnet Calculator

Calculate IPv4 subnet information, network ranges, and subdivide networks.

Try Subnet Calculator

Security

Hash Identifier

Identify hash types from hash strings.

Try Hash Identifier

Hash Generator

Generate MD5, SHA-1, SHA-256, and other hash values.

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AES Encryption

Encrypt and decrypt text using AES algorithm.

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RSA Encryption

Encrypt and decrypt using RSA public-key cryptography.

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Password Generator

Generate strong, secure passwords with custom options.

Try Password Generator

HMAC Generator

Generate HMAC signatures for message authentication.

Try HMAC Generator

Checksum Calculator

Calculate file checksums for integrity verification.

Try Checksum Calculator

SSL Certificate Decoder

Decode and inspect SSL/TLS certificates.

Try SSL Certificate Decoder

Bcrypt Generator

Generate and verify bcrypt password hashes.

Try Bcrypt Generator

Password Strength Checker

Check the strength of your passwords instantly.

Try Password Strength Checker

Developer Tools

Code Diff Checker

Compare two code blocks.

Try Code Diff Checker

Text Diff Checker

Compare two text blocks and highlight differences.

Try Text Diff Checker

Markdown Preview

Live preview of Markdown content with GFM support.

Try Markdown Preview

Text Case Converter

Convert text between different cases (upper, lower, title, etc.).

Try Text Case Converter

Lorem Ipsum

Generate placeholder text for design and development.

Try Lorem Ipsum

Word Counter

Count words, characters, sentences, and paragraphs.

Try Word Counter

String Escape

Escape and unescape strings for various languages.

Try String Escape

Slug Generator

Generate URL-friendly slugs from text.

Try Slug Generator

Regex Tester

Test and validate regular expressions with live matching.

Try Regex Tester

JSON Schema Validator

Validate JSON data against JSON Schema.

Try JSON Schema Validator

XML Schema Validator

Validate XML data against XSD schemas.

Try XML Schema Validator

JSON Path Finder

Query JSON data using JSONPath expressions.

Try JSON Path Finder

XPath Tester

Query XML data using XPath expressions.

Try XPath Tester

Cron Parser

Parse and validate cron expressions with ease.

Try Cron Parser

UUID Validator

Validate and parse UUID/GUID strings.

Try UUID Validator

.env Parser

Parse and view .env files.

Try .env Parser

JWT Encoder / Decoder

Encode, decode, verify, and inspect JSON Web Tokens entirely in your browser.

Try JWT Encoder / Decoder

GraphQL Query Builder

Paste a GraphQL SDL schema and visually build queries with a field tree and variables.

Try GraphQL Query Builder

OpenAPI / Swagger Spec Explorer

Paste or upload an OpenAPI/Swagger spec and browse endpoints, schemas, and generate curl commands.

Try OpenAPI / Swagger Spec Explorer

JSON to C# Class Generator

Generate C# classes from JSON data automatically.

Try JSON to C# Class Generator

JSON to TypeScript

Convert JSON data to TypeScript interfaces and types.

Try JSON to TypeScript

JSON to SQL

Convert JSON data to SQL INSERT statements.

Try JSON to SQL

JSON to SQL Schema Generator

Generate SQL CREATE TABLE statements with inferred column types from JSON.

Try JSON to SQL Schema Generator

EF Core Model Generator

Generate a C# entity class and DbContext registration from a SQL Server CREATE TABLE statement.

Try EF Core Model Generator

Database ER Diagram Generator

Generate a visual entity-relationship diagram from SQL CREATE TABLE statements using Mermaid.js.

Try Database ER Diagram Generator

HTML to JSX Converter

Convert HTML to React JSX with automatic attribute conversion.

Try HTML to JSX Converter

Markdown Table Generator

Generate Markdown tables from data quickly and easily.

Try Markdown Table Generator

Fake Data Generator

Generate realistic fake data for testing, development, and prototyping.

Try Fake Data Generator

Emoji Picker

Browse and copy emojis by category for your projects.

Try Emoji Picker

Git Commit Message Generator

Generate Conventional Commits-compliant commit messages from a diff or description using AI.

Try Git Commit Message Generator

Git Branch Name Generator

Generate a URL-safe Git branch name from a task description and optional Jira ticket ID.

Try Git Branch Name Generator

Finance & Banking

SWIFT MT Parser

Parse and analyze SWIFT MT banking messages to inspect headers, fields, and transaction details.

Try SWIFT MT Parser

IBAN Validator

Validate and parse IBAN numbers — extract country code, bank code, and check digits.

Try IBAN Validator

Loan / EMI Calculator

Calculate monthly loan payments, total interest, and view a full amortization schedule.

Try Loan / EMI Calculator

Credit Card Validator

Validate credit card numbers using the Luhn algorithm and detect card networks.

Try Credit Card Validator

Compound Interest Calculator

Calculate compound interest with customizable principal, rate, time, and compounding frequency.

Try Compound Interest Calculator

Invoice Generator

Generate professional PDF invoices with itemized line items, tax, and discounts.

Try Invoice Generator

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