Every tool you need, in one place
Fast, free online tools for text, conversions, calculations, and development. Most run entirely in your browser — your data never leaves your device.
Popular categories
View all categoriesPopular tools
View all toolsWord Counter
Count words, characters, sentences and paragraphs instantly. Free, accurate, and works right in your browser — no sign-up needed.
Password Generator
Generate strong, random passwords instantly. Customize length and character types. 100% client-side — your password is never transmitted or stored.
JSON Formatter & Validator
Format, validate, and beautify JSON instantly. Catch syntax errors and pretty-print minified JSON for free, right in your browser.
Unit Converter
Convert length, weight, temperature, and file size units instantly — including MB to KB, GB to MB, meters to feet, and more. Free and accurate.
BMI Calculator
Calculate your Body Mass Index (BMI) using metric or imperial units. Free, instant, and private — nothing you enter is stored or sent anywhere.
Image Compressor
Compress and resize images to reduce file size (MB to KB) without uploading them anywhere. Free, instant, adjustable quality — all in your browser.
Case Converter
Instantly convert text between UPPERCASE, lowercase, Title Case, Sentence case, and more. Free online case converter, no sign-up needed.
Percentage Calculator
Calculate percentages, percentage increase/decrease, and discounts instantly. Free online percentage calculator with clear step-by-step results.
About ToolKitHub
ToolKitHub is a growing collection of free online tools built for everyday tasks — from counting words and formatting JSON to calculating percentages. Every tool is designed to be fast, ad-light, and usable without creating an account. Where possible, tools run entirely client-side in your browser, meaning your text and data are never uploaded to a server.