Everyday tools that run in your browser

Convert prices, check attendance, work out your CGPA, merge images into a PDF and clean up text. Nothing to install, nothing uploaded.

Tools by category

Finance & Business

Education

Date & Time

Text & Developer

Image & PDF

All tools

Reverse GST CalculatorFind the GST-exclusive price from a GST-inclusive amount, with CGST and SGST split.Attendance Shortage CalculatorSee your attendance percentage, classes needed to hit a target and classes you can miss.Target Marks CalculatorWork out the marks you still need to reach a target percentage in any exam total.CGPA and SGPA CalculatorCredit-weighted SGPA and CGPA with an editable grade scale and conversion formula.Reverse Discount CalculatorFind the original price from a sale price, for percentage or fixed discounts.Profit Margin and Markup CalculatorGross profit, margin % and markup % for one or many products.Age and Next Birthday CalculatorExact age in years, months and days plus days left until your next birthday.Date Difference CalculatorDays, weeks, months and years between two dates, plus add or subtract days.Duplicate Lines RemoverRemove repeated lines from large lists while keeping the original order.Image Dimensions CheckerRead an image's width, height, aspect ratio, file size and format locally.Image to PDF ConverterCombine JPG and PNG images into one PDF, choose page size and order, offline.JSON Formatter and ValidatorBeautify, minify and validate JSON with clear syntax error locations.

Recently added

NewImage to PDF ConverterCombine JPG and PNG images into one PDF, choose page size and order, offline.NewJSON Formatter and ValidatorBeautify, minify and validate JSON with clear syntax error locations.NewDuplicate Lines RemoverRemove repeated lines from large lists while keeping the original order.NewDate Difference CalculatorDays, weeks, months and years between two dates, plus add or subtract days.

Why use ToolsKit?

Private by design: entries and files are processed on your device, not uploaded.
No account: open a tool and use it.
Explained, not just computed: every page shows the formula, a worked example and answers to common questions.
Light on data: plain HTML, CSS and JavaScript with no frameworks, so pages load quickly on mobile.

How our tools work

Each tool is a small program written in JavaScript that runs inside your browser tab. When you press Calculate, the script reads your inputs, validates them, applies a documented formula and shows the result. For file tools, the browser's File, Canvas and Blob features read and create files locally. Because there is no server step, there is nothing to wait for and no copy of your data to leak.

Frequently asked questions

Are the tools really free?

Yes. There is no signup, no paywall and no usage limit. The site may show advertising in future to cover running costs; see the Privacy Policy.

Are my files uploaded?

No. Calculations, text processing, image reading and PDF creation run inside your browser. Your files and entries are not sent to our servers.

Do the tools work offline?

Once a page has loaded, the tool logic runs locally, so most tools keep working without a connection until you reload.

Can I rely on the results?

The calculators use standard formulas, but institutions, tax authorities and employers may apply their own rules. Verify anything important.

How do I suggest a tool?

Email us using the address on the contact page.

About this website

ToolsKit is a collection of free utilities for students, small business owners, developers and anyone who needs a quick answer. We focus on tools that solve specific problems, such as removing GST from a bill, finding how many classes you must attend, or turning receipts into one PDF. Learn more on the About page.