Free Online Tools and Converters For Developers
FreeDevToolKit is a collection of free, fast, and privacy-friendly online tools built to make developers' everyday tasks easier. From JSON and XML converters to encoders, formatters, and color tools — everything is free and runs 100% client-side.
This project was created to provide lightweight and easy-to-use utilities. Our goal is to offer reliable and accessible tools that developers can use instantly, without sign-ups or accounts.
If you find these tools helpful, please consider sharing the site and bookmarking it.
if you have suggestions for new tools or improvements or if you find any bugs, please email me at "content6393@gmail.com" also include the steps to reproduce the issue.
🚀 List of Tools
Epoch Timestamp To Date
Convert Unix epoch timestamps into human-readable date and time formats with our fast, privacy-friendly tool. Supports both UTC and local timezones. Great for developers, data engineers, and log analysis.
XML to JSON Converter
Easily convert structured XML data into clean, readable JSON format. This tool helps developers work across APIs, configurations, and data formats in real-time. Supports nested XML and attribute parsing.
JSON to XML Converter
Transform JSON objects into XML structure with this lightweight online converter. Useful for integrating with legacy systems, SOAP APIs, or data migration workflows.
CSV to JSON Converter
Convert CSV files into JSON format for API ingestion, databases, or structured data analysis. Upload a file or paste CSV directly to get structured JSON instantly.
CSV to XML Converter
Easily convert CSV spreadsheets into XML format for legacy systems, data exchange, and reporting. Supports custom delimiters and large datasets.
YAML to JSON Converter
Convert YAML configuration files into JSON with this instant converter. Ideal for Kubernetes configs, GitHub Actions, and DevOps pipelines.
JSON to YAML Converter
Transform JSON objects into clean YAML syntax for config files and DevOps use. Easy to use and fast, with support for nested data structures.
JSON Formatter
Format and beautify JSON data for better readability. This tool helps developers quickly debug and visualize JSON structures with syntax highlighting.
Text Case Converter
Convert text between different cases: uppercase, lowercase, title case, sentence case, and capitalized words. Perfect for formatting text in documents, code comments, and more.
Base64 Encoder/Decoder
Encode or decode Base64 strings quickly. Useful for data encoding, API requests, and file transfers.
JWT Decoder
Decode JWTs to inspect header and payload — quick, client-side token viewer.
URL Encoder/Decoder
Encode or decode URLs to ensure safe transmission over the web. Handles special characters and spaces.
HTML Entities Encoder/Decoder
Encode or decode HTML entities like <, >, &, ", ' instantly. Fast, SEO-friendly online tool for safe HTML string conversion.
UUID Generator
Generate unique UUIDs (Universally Unique Identifiers) for database keys, session IDs, and more. Supports UUID versions 4.
SHA256 / MD5 Hash Generator
Generate secure SHA256 or MD5 hashes for strings. Useful for password hashing, data integrity checks, and secure encoding.
Text Diff Checker
Compare two blocks of text to see the differences highlighted. Useful for content comparison, developers, and copy editors.
String / Word Counter
Count words, characters (with and without spaces) in your text. Fast and minimal online string/word counter tool.
Regex Tester
Test and debug regular expressions with real-time feedback. Supports syntax highlighting and error detection for efficient regex development.
Color Converter
Convert color very fast from from hex to RGB with a live color checker .
Number Base Converter
Convert numbers between different bases (e.g., binary, decimal, hexadecimal) easily. Useful for developers, data analysts, and anyone working with number systems.
Age Calculator
Calculate the exact age or duration between two dates in years, months, weeks, days, hours, minutes, and seconds. A fast and developer friendly tool for age calculations.
PX to REM & REM to PX Converter
Convert pixel values to REM units and vice versa for responsive web design. Input your base font size and get accurate values instantly.
PX to EM & EM to PX Converter
Convert pixel values to EM units and vice versa for responsive web design. Input your base font size and get accurate values instantly.