Free Online Developer Tools

58 tools for developers, designers, and teams. PDF tools, JSON formatters, encoders, and more. No signup required.

58Total Tools

7Categories

37New Tools

New Tools

Recently added to the toolkit

Invoice Generator PDF Compress PDF Extract Pages PDF Rotate PDF Protect PDF Unlock

Popular Tools

Most used by developers

Invoice Generator PDF Merge PDF Splitter JSON Formatter JWT Decoder Regex Tester

Agile Tools

Tools for agile teams and ceremonies

Estimate user stories with your team

Retrospective Board

Run effective sprint retrospectives

Sprint Calculator

Calculate sprint dates and capacity

Tired of debugging? Deal yourself in.

Business Tools

Invoicing, quotes, and business documents

Invoice Generator

Create professional invoices instantly, download as PDF

PDF Tools

Merge, split, compress, and manipulate PDF files

Combine multiple PDF files into one document

Split PDF files into smaller chunks

Reduce PDF file size while maintaining quality

PDF Extract Pages

Extract specific pages from a PDF document

Rotate PDF pages 90°, 180°, or 270°

Add password protection to PDF files

Remove password protection from PDF files

Developer Tools

Essential tools for software development

Format, validate, and minify JSON data

Convert between JSON and YAML formats

Decode and inspect JSON Web Tokens

Base64 Converter

Encode and decode Base64 strings

Encode and decode URL components

Generate random UUIDs (v4) instantly

Password Generator

Create strong, secure passwords

Generate SHA-256, SHA-512 and other hashes

Test and debug regular expressions

Create and validate cron expressions

Color Converter

Convert between HEX, RGB, and HSL

Mock Data Generator

Generate realistic test data

QR Code Generator

Create QR codes for URLs, WiFi, contacts

Format, beautify, and minify SQL queries

Convert between CSV and JSON formats

Number Base Converter

Convert between binary, hex, octal, and decimal

Encode and decode HTML entities

Convert between KB, MB, GB, TB and more

Compare two JSON objects and see differences

Escape/unescape strings for JSON, HTML, URL, SQL

Aspect Ratio Calculator

Calculate image and video aspect ratios

Chmod Calculator

Calculate Unix file permissions (755, rwx)

Convert text to URL-friendly slugs

Placeholder Image

Generate placeholder images for mockups

Query DNS records (A, MX, TXT, NS, etc.)

Meta Tags Analyzer

Analyze Open Graph & Twitter Cards from URLs

Get location and network info for any IP

HTTP Headers Inspector

Inspect headers and security of any URL

JSON Schema Generator

Generate JSON Schema from example data

Create, sign, and verify JSON Web Tokens

Base64 Image Converter

Convert images to/from Base64 data URIs

Convert cURL to JS, Python, PHP, Go, Rust

Collection of tested regex patterns

Text Tools

Text manipulation and formatting utilities

Text Diff / Compare

Compare two texts and highlight differences

Markdown Preview

Write Markdown with live preview

Convert between camelCase, snake_case, and more

Count words, characters, sentences

Generate placeholder text for designs

Image Tools

Image processing and conversion tools

Image Compressor

Compress images while maintaining quality

Resize and optimize GIF images

Convert images to PDF documents

Convert Apple HEIC images to JPG

App Icon Generator

Generate icons for iOS, Android, Web & PWA

App Screenshot Generator

Create App Store & Google Play screenshots with device frames

System Tools

System utilities and converters

Convert between time zones and formats

Convert Unix timestamps to dates and vice versa

More tools coming soon

We're constantly adding new tools. Stay tuned!