Free Online Calculators & Tools
137+ focused, browser-based calculators and utilities — math, finance, health, PDFs, images, developer tools, and more. No installs, no accounts, and your files and inputs aren't uploaded to our servers.
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Calculators
63 calculators
PDF Tools
18 tools
Image Tools
22 tools
Converters
17 tools
Video Tools
1 tool
Developer Tools
12 tools
Text Tools
7 tools
Audio Tools
6 tools
SEO & Web Tools
2 tools
Generators
4 tools
Other Tools
2 tools
Word Tools
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Excel Tools
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Popular tools
Curated based on general search-demand patterns, not live analytics.
Percentage Calculator
Find what X% of a number is, or what percentage one number is of another.
Unit Converter
Convert between common units of length, weight, volume, area, speed, and temperature.
PDF to Image Converter
Convert each page of a PDF into a downloadable PNG image.
Image Compressor
Reduce a JPEG or PNG's file size by adjusting quality, with a live before/after comparison.
JSON Formatter & Validator
Pretty-print, minify, and validate JSON, with the exact parse error if it's invalid.
EMI Calculator
Monthly loan installment, total interest, and a full repayment schedule.
BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight, and see which general weight category it falls into.
QR Code Generator
Turn any text or URL into a scannable QR code you can download as an image.
Word & Character Counter
Count words, characters, sentences, and estimated reading time as you type.
Password Generator
Generate a strong, random password with adjustable length and character types.
PDF to Word Converter
Extract a PDF's real, selectable text into a genuine .docx file.
Why WebToolGrid?
Most calculator and tool sites bury a simple task under logins, pop-ups, or bloated downloads. WebToolGrid does the opposite: each tool is a single page that loads fast, works on any device, and explains what it's doing — not just the result itself.
Every calculator page includes the formula it uses and a worked example. Every file tool — PDF, image, or audio — processes your file entirely in your browser, so it is never uploaded to our servers. See our Privacy Policy for the few exceptions and what diagnostic data the site sends.
Common questions about WebToolGrid
Is WebToolGrid really free?
Yes. Every calculator on WebToolGrid is free to use, with no account, sign-up, or download required.
Do you store the numbers I enter?
No. All calculations run locally in your browser using JavaScript — your inputs are never sent to a server or stored.
Are the results accurate enough for financial decisions?
The calculators use standard, widely documented formulas and are accurate for planning purposes, but they are not a substitute for advice from a qualified financial or tax professional. See our Disclaimer for details.
Have a suggestion for a calculator or tool we should add? Let us know.