About CoreTools
CoreTools maintains 56 core browser-based tools, with 270 task-specific preset pages for exact sizes, exams, documents and calculation scenarios — 326 working tool routes in total. The collection includes image and compression tools, PDF and document tools, exam-document tools, finance calculators, and security and utility tools. Nothing you process here is uploaded to a server; your own device does the work and downloads the result straight from memory.
Why we built it this way
Most online image tools work by uploading your file, processing it in a data centre, and sending it back. That model is slow on Indian mobile networks and uncomfortable when the file is your passport photo or your signature — documents tied directly to your identity. A browser-native approach removes both problems: processing starts instantly, works on a weak connection once the page is loaded, and your files physically never leave your device. You can verify this yourself — open your browser's network tab while using any tool and watch: no file upload request is ever made.
How we keep exam specifications accurate
Our exam tools resize photos, signatures, thumb impressions and declarations to the exact pixel and kilobyte requirements published by SSC, UPSC, IBPS, NEET, GATE and JEE. These specifications change between recruitment cycles, so we re-verify every value against the current official notification or portal guideline and stamp the verification date on the tool itself. The full process — which sources count as official, how ranges are interpreted, what happens when a notification is ambiguous — is documented on our methodology page. If a spec changes before we catch it, tell us and we correct it within days, not months.
How the site earns money
CoreTools is free and intends to stay free. The site is supported three ways: advertising, affiliate recommendations (always marked with a disclosure line, and we only recommend products in categories relevant to the tool you just used), and optional Pro upgrades for power features like batch processing. The core function of every tool — compressing one image, resizing one signature — is never paywalled and never will be. None of these revenue sources sees your files, because your files never leave your browser in the first place.
Who runs this
CoreTools is independently built and maintained from India — no content farm, no outsourced tool factory. Every formula, every preset and every line of copy on this site is reviewed by the same person who answers the contact form. Found a bug, a wrong spec, or a tool you wish existed? That form reaches a human who can actually fix it.