Free Online Developer Tools
Use fast, simple, and privacy-friendly tools to format data, debug APIs, and improve your workflow.
JSON TOOLS
Visualize and explore JSON data in an easy-to-read tree structure.
Format, validate, and beautify JSON for better readability.
Convert JSON data into clean and structured XML format.
Transform XML documents into valid JSON instantly.
Flatten nested JSON into a simple key-value structure.
Combine multiple JSON objects into a single JSON output.
Sort JSON object keys alphabetically for cleaner organization.
TEXT TOOLS
Count words, characters, sentences, and paragraphs instantly.
Convert text between uppercase, lowercase, title case, and more.
Remove duplicate lines from text while preserving unique entries.
Sort text lines alphabetically, numerically, or by length.
Quickly find, replace, and update text content in bulk.
Create clean SEO-friendly URL slugs from any text.
Generate placeholder text for designs, websites, and content layouts.
DEVELOPER & OTHER TOOLS
Convert Unix timestamps into human-readable dates and times.
Calculate your monthly EMI instantly.
Estimate mutual fund SIP returns and future wealth growth.
Convert length measurements between metric and imperial units.
Convert images into Base64 strings for web development.
All-in-One Free Tools for Developers
Stackaris provides a growing collection of free online tools for developers and tech users. From JSON viewers and data encoders to text utilities and AI-powered tools, everything is designed to be fast, simple, and easy to use directly in your browser.
Need a Specific Tool?
Can’t find what you’re looking for? Request a new tool and we’ll consider adding it to Stackaris.