About

About SidTools

SidTools is a collection of free calculators and converters built for India by Siddhesh Gupta. It started with a single EMI calculator and now covers loans and investments, GST and income tax, AI API budgeting, image and PDF conversion, and everyday utilities.

What makes it different
Every tool runs entirely in your browser. Your photos, PDFs and numbers never leave your device, there is no account to create, no file limits and no watermark. Finance and tax tools use Indian conventions: lakh and crore formatting, FY 2026-27 slabs, quarterly FD compounding, and the exact photo sizes Indian portals demand.

Who runs it
I am Siddhesh Gupta, a developer based in Maharashtra. I build and maintain every tool myself, verify formulas against official sources (RBI, CBDT, bank documentation), and update the tax tools each budget. If something looks wrong, tell me through the contact page and I will fix it.

How the site is funded
SidTools is free and supported by advertising. Ads never affect which tools are built or how results are calculated.