Every Online Tool You Need.
100% Free & Private.
Fast, browser-based utilities for developers, creators, and everyday users. Convert text, manipulate PDF/images, and calculate finance metrics — zero file uploads, zero signup.
Text Tools
16 text utilities including Case Converter, Compare & Diff, Find & Replace, JSON Formatter, Base64, and Text-to-Speech.
File Tools
32 in-browser file tools for PDF merging, splitting, image compression, resizer, cropper, Markdown live preview, Excel/CSV converters, and QR codes.
Calculators
12 online calculators for Loan EMI, GST tax, Income Tax India, SIP returns, Compound Interest, BMI, Age, and Percentages.
Text Utilities
Transform, compare, format, and convert text content
Case Converter
Transform case, spacing, and structure — camelCase, snake_case, kebab-case, and more.
Text Compare
Diff two texts line by line with character-level highlights for edits.
Find & Replace
Search with live highlights, then replace all or the first match.
Lorem Ipsum
Generate placeholder paragraphs for mockups and layouts.
Base64 Encoder
Encode text to Base64 and decode Base64 back to UTF-8.
JSON Formatter
Format, prettify, minify, and validate JSON with error locations.
URL Encoder
Percent-encode or decode URLs and query strings safely.
Password Generator
Generate strong random passwords with configurable character sets.
File & Image Tools
Compress, merge, split, and convert files 100% in your browser
Image to PDF
Combine multiple images into a single PDF file.
Image Compressor
Shrink image file size with a quality slider.
Image Resizer
Resize images by pixels or percentage.
Image Cropper
Crop images visually and download instantly.
Image Format Converter
Convert between JPG, PNG, WebP and BMP.
Image to Base64
Encode images to Base64 — or decode back to an image.
Image Watermark
Add a text watermark with position and opacity controls.
PDF Merger
Merge multiple PDFs into one in any order.
Finance & Everyday Calculators
Loan EMI, GST, SIP, Income Tax, BMI, and age calculators
EMI Calculator
Calculate monthly EMI, total interest, and complete amortization schedule for home, car, or personal loans.
GST Calculator
Calculate Goods and Services Tax (GST) easily with 5%, 12%, 18%, 28% rates or custom rates with Add/Remove GST toggles.
Income Tax Calculator (India)
Compare Old vs New Tax Regime for FY 2024-25 / FY 2025-26 with slab breakdowns, deductions, and Section 87A rebate.
SIP Calculator
Calculate expected future value, total investment, and wealth gains from Systematic Investment Plans (SIP) in mutual funds.
Compound Interest Calculator
Calculate interest growth compounded annually, semi-annually, quarterly, or monthly over time.
BMI Calculator
Calculate Body Mass Index (BMI), body category, and ideal healthy weight range in metric or imperial units.
Age Calculator
Calculate exact age in years, months, days, total hours, and see countdown to your next birthday.
Percentage Calculator
Multi-mode percentage tool: calculate percentage of a number, percentage of total, and percentage increase/decrease.
Discount Calculator
Calculate final price after single or stackable double discounts and total money saved during sales.
Tip Calculator
Calculate total tip amount and split restaurant bills per person easily with custom tip percentages.
Unit Converter
Convert units for Length, Weight, and Temperature instantly with side-by-side conversion formulas.
Currency Converter
Convert between major world currencies with exchange rates and static offline fallback.
Developer Guides & Knowledge Base
Loan EMI Calculation Formula Explained with Examples
Understand how Equated Monthly Installments (EMI) work, the mathematical formula behind loan interest, and how to reduce total interest.
How to Merge PDF Files Online Privately (Zero File Uploads)
Combine multiple PDF documents into a single file directly in your web browser. 100% private, instant, and free.
camelCase vs snake_case vs kebab-case — Which Should You Use?
A practical guide to the three most common code naming conventions — when to use each, why they exist, and how to convert between them instantly.
Why Toolkit Prioritizes In-Browser Privacy & Speed
Most online converters and utility sites force users to upload their documents to remote servers where they are saved to disk, processed in backend queues, and retained indefinitely. Toolkit by NS Ascertain redefines this paradigm by taking advantage of modern browser capabilities like WebAssembly and client-side JavaScript APIs.