Nithish

Developer & Blogger , 21K Tools

India

34 Published Posts

About Nithish

Hi, I’m Nithish. I’m the guy behind 21K Tools. I got tired of online tools that were slow, full of ads, paywalled or sketchy with privacy, so we built simple free ones that actually feel good to use everything runs in your browser, no account needed (maybe someday), no tracking. I write the guides here from stuff I test and use myself. Got suggestions, problems or ideas? Just email us at contact@21k.tools or fill the form at the Help Center. Follow @21ktools on X for updates.

Published Articles

Productivity

How to Create a QR Code Free for Business in 2026

Learn how to create a QR code free for your business, website, menu, or personal use in 2026. Generate custom QR codes instantly using 21K …

Tools

Why Your Images Are Too Large — And How to Actually Fix It in 2026

Learn how to compress images online for free without losing quality. Reduce image file size for websites, WhatsApp, Instagram & email using 21K Tools free …

Tools

Date Differences, Time Addition, and Unit Conversion - Three Time Calculations Most People Do Wrong

A digital calendar-based graphic displaying two dates connected by a time difference calculator showing the number of days, hours, and minutes between them, branded with …

Overview

Why "I'm 27 Years Old" Isn't Always Enough — How to Calculate Your Exact Age for Any Official Purpose

A futuristic digital illustration showing an online age calculator displaying the exact age in years, months, days, hours, and seconds, with the 21K Tools logo …