Free Online Calculators, Converters & Developer Tools
Online Free Tools brings together practical calculators, unit converters, and developer utilities for everyday tasks.
Calculate, convert, compare, and format data without creating an account.
Featured Tools
A selection of useful calculators and converters
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 with Unicode, URL-safe Base64, and browser-based processing.
HTML Encoder/Decoder
Encode and decode HTML entities online. Escape HTML for display or attributes and decode entities with browser-based processing.
URL Encoder/Decoder
Encode and decode URLs and query strings online. Supports encodeURIComponent, spaces as plus, and Unicode with browser-based processing.
MD5 Hash Generator & Checksum Verifier
Generate MD5 hashes and verify text or files against checksums. MD5 is a one-way hash, not encryption, and is not suitable for password storage or security-sensitive cryptography.
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.
Percent Off Calculator
Find the savings and final sale price for a percentage discount, with common presets and currency formatting.
Unit Price Calculator
Compare two or three products by price per kilogram, litre, or item using compatible quantity conversions.
Square Footage Calculator
Calculate area for common shapes, combine rooms, convert square feet and square meters, and estimate material waste.
Feet & Inches Calculator
Add or subtract feet, inches, and fractions, then see normalized and metric results.
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
Developer Tools
Essential tools for developers and programmers
Measurement & DIY
Measure rooms and work with construction dimensions
Shopping Calculators
Compare product value and calculate sale prices
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.
Browser-based calculations
Most calculators and converters process your entries in the browser. Contact form submissions and advertising services are handled as described in our Privacy Policy.
Free to use
Available tools can be used without an account. The site may display advertising.
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.
Most calculators and converters process entries in your browser. Contact form submissions are sent to us, and advertising services may process data. See our Privacy Policy for details.
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?
Available tools are free to use and do not require an account. The site may display advertising.
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?
Calculators use the formulas described on their pages. Results are estimates for general information and should be checked before being used for financial, health, or other important decisions.
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.
What happens to information I enter?
Most calculator and conversion inputs are processed in your browser. Contact form submissions are sent to us so we can reply, and advertising services may process data as described in our Privacy Policy.
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.