🧰 HeavyToolz

Guides & how-tos

Practical write-ups on the tasks our tools solve — tax calculations, JSON debugging, image editing, and more.

📎 How to Merge PDF Files Without Losing Quality Combining PDFs shouldn't re-compress your images or scramble your page order. Here's the right way to do it, entirely offline. 🪄 How to Remove a Background From a Photo for Free No Photoshop, no software install, no upload to a stranger's server — here's how in-browser AI background removal actually works. { } 5 Common JSON Errors and How to Fix Them Trailing commas, unquoted keys, and mismatched brackets — here's how to read a JSON error message and fix it fast. 🧾 How to Calculate Income Tax in Pakistan (2026 Guide) A plain-English walkthrough of Pakistan's salary tax slabs, how to work out your own tax liability by hand, and where an online calculator saves you time.