Professional Online Tools for Everyone
Developer tools, financial calculators, health trackers, and unit converters — all in one place.
JSON/XML formatters • EMI & SIP calculators • BMI tracker • Unit converters • No registration • 100% free
Popular Tools
Most used calculators and converters by our users
JSON Formatter & Validator
Professional JSON formatter, validator, and beautifier. Format, validate, minify JSON with syntax highlighting. Convert JSON to XML, CSV, YAML instantly.
XML Formatter & Validator
Professional XML formatter, validator, and beautifier. Format, validate, minify XML with syntax highlighting. Convert XML to JSON, CSV instantly.
EMI Calculator
Calculate your monthly EMI for home loans, personal loans, and car loans with our easy-to-use calculator.
Unit Converter
Convert between different units of length, weight, temperature, and volume instantly.
Age Calculator
Find out your exact age in years, months, and days. Perfect for planning birthdays and anniversaries.
✨ Newly Added Tools
Check out our latest calculators and converters
Base64 Encoder/Decoder
Encode and decode Base64 text and files online. Supports Unicode, URL-safe Base64, and file download. Free, private, and runs entirely in your browser.
HTML Encoder/Decoder
Encode and decode HTML entities online. Safely escape HTML for display or attributes and decode back. Free, private, and runs entirely in your browser.
URL Encoder/Decoder
Encode and decode URLs and query strings online. Supports encodeURIComponent, space as plus, and Unicode. Free, private, and runs entirely in your browser.
MD5 Encrypt/Decrypt
Generate MD5 hashes and verify text or files against MD5 checksums online. Fast, private, in-browser MD5 hash generator and verifier for developers.
Split Text
Split text by delimiter or newline. Remove empties, trim parts, and export lines.
Join Text
Join lines with a custom delimiter. Trim lines and ignore blank lines.
Trim Text
Remove leading and trailing whitespace from text. Trim individual lines.
Remove Empty Lines
Remove blank lines from text. Keep or trim remaining lines.
Remove All Whitespaces
Remove all spaces, tabs, and whitespace characters. Preserve newlines optionally.
Space to Newline
Convert spaces and whitespace to newlines. Useful for reformatting text.
Newlines to Spaces
Convert newlines to spaces. Join lines into a single line.
Add Line Numbers
Add line numbers to each line. Customize numbering format and separator.
Uppercase Converter
Convert text to uppercase instantly. Process entire text or line by line.
Lowercase Converter
Convert text to lowercase instantly. Process entire text or line by line.
Invert Case Converter
Swap uppercase and lowercase letters instantly. Process entire text or line by line.
Title Case Converter
Convert text to title case - capitalize first letter of each word.
Sentence Case Converter
Convert text to sentence case - capitalize only the first letter.
Randomize Case Converter
Randomize text case - randomly convert letters to uppercase or lowercase.
Loan Calculator
Calculate monthly payments, total interest, and amortization schedule for any loan amount.
Mortgage Calculator
Calculate home loan payments with taxes, insurance, and PMI. Compare different mortgage scenarios.
Retirement Calculator
Plan your retirement savings and estimate how much you need to retire comfortably.
Browse by Category
Explore tools organized by their purpose
Financial Calculators
Manage your finances with our comprehensive financial calculators
Health & Fitness
Track your health metrics and fitness goals
Unit Converters
Convert between different units of measurement
Utility Tools
Useful tools for everyday calculations
Date & Time
Calculate dates, ages, and time differences
Math Tools
Mathematical calculators and converters
Developer Tools
Essential tools for developers and programmers
Text Converters
Transform and manipulate text online
Why Choose Our Tools
All-in-One Toolkit
Developer tools (JSON/XML formatters), financial calculators (EMI, SIP), health trackers (BMI), and unit converters all in one place.
100% Private & Secure
All processing happens in your browser. No data sent to servers. Your files and calculations stay completely private and secure.
Always Free
No sign-up, no credit card, no limits. Professional-grade tools completely free forever. Unlimited calculations and conversions.
Online Free Tools is your comprehensive toolkit for everyday needs. From developer tools like JSON/XML formatters and comparison tools, to financial calculators for EMI and SIP planning, health trackers for BMI monitoring, and versatile unit converters — we've got you covered.
Built with privacy and performance in mind, all processing happens locally in your browser. No registration, no data collection, no hassle. Just professional tools that work instantly and respect your privacy.
How to Use Our Tools
Getting started with our online tools is simple and straightforward. Follow these easy steps to perform any calculation.
Select Your Tool
Browse our collection and choose the calculator or converter you need from the tools section.
Enter Your Values
Input your numbers or select options in the provided fields. All fields are clearly labeled for easy understanding.
Get Instant Results
Click calculate or convert, and get your results immediately. No waiting, no processing delays.
Use or Share Results
Use the results for your planning or decision-making. You can perform multiple calculations as needed.
Frequently Asked Questions
Find answers to common questions about our online tools and services.
Are these tools really free to use?
Yes, absolutely! All our calculators and converters are 100% free to use with no hidden charges, subscriptions, or premium features. You can perform unlimited calculations without any cost.
Do I need to register or create an account?
No registration is required. Simply visit any tool page and start calculating immediately. We believe in providing instant access to our services without any barriers.
How accurate are the calculations?
Our calculators use standard mathematical formulas and algorithms that are widely accepted and accurate. For financial calculations like EMI, we use the industry-standard formulas used by banks and financial institutions.
Can I use these tools on my mobile device?
Yes! All our tools are fully responsive and work perfectly on smartphones, tablets, and desktop computers. The interface automatically adapts to your screen size for the best user experience.
Do you store my calculation data?
No, we do not store any of your calculation inputs or results. All calculations are performed in your browser, ensuring complete privacy. Your data never leaves your device.
Will you add more tools in the future?
Yes! We continuously work on adding new calculators and converters based on user needs and feedback. Check back regularly to discover new tools that can help with your daily calculations.
Can I suggest a new tool or feature?
We welcome suggestions! If you have ideas for new tools or improvements to existing ones, please reach out through our contact page. We value user feedback and continuously improve our services.