15 Free Online Tools That Just Work

Free calculators, converters and browser-based tools that open instantly, need no account, and keep your files, text and numbers on your device.

Try age, BMI, EMI, password, QR, compress, JSON

Everyday Calculators

Age Calculator Exact age in years, months and days plus next birthday countdown. Percentage Calculator Percent of a number, share of a total and percent change. Date Difference Calculator Days between dates, working days and date arithmetic.

Health and Fitness

BMI Calculator Body mass index with category and healthy weight range.

Money and Business

Loan EMI Calculator Monthly instalment, total interest and a year-wise balance. Discount Calculator Final sale price, money saved and stacked discounts. Sales Tax Calculator Add or strip VAT, GST and sales tax from any price.

Converters

Unit Converter Length, weight, temperature, area, volume, speed and data.

Writing and Text

Word Counter Words, characters, sentences, reading time and keyword density. Text Case Converter Uppercase, lowercase, title, sentence, camel, snake and slug.

Security and Privacy

Password Generator Strong random passwords generated directly in your browser.

Generators

QR Code Generator QR codes for links, text, WiFi and phone numbers. PNG download.

Images and Files

Image Compressor Shrink JPG, PNG and WebP without uploading anything.

Developer Tools

JSON Formatter Beautify, minify and validate JSON with clear errors. Color Converter HEX, RGB and HSL with a contrast check for accessibility.

Why These Free Online Tools Are Different

Toolbay provides simple free online calculators, converters, generators and file tools that run directly in your browser. There is no account required, and many tools process your information locally on your device.

Works Offline Once Loaded

Because the calculations and processing are performed in your browser, supported tools can continue working after the page has loaded even when your connection becomes unavailable.

Free for Everyday Use

Use Toolbay to calculate your age, BMI, loan EMI, percentages, discounts, taxes and date differences, or to convert units, create QR codes, generate passwords, compress images and format JSON.