Free online tools
22+ practical tools, ready to use with no installation. All data is processed locally in your browser for better privacy.
Popular tools
View all →JSON Formatter
Online JSON formatting, compression, validation and escaping with automatic error positioning.
Timestamp Converter
Convert between Unix timestamps and date-time, supporting seconds/milliseconds.
Base64 Encoder/Decoder
Base64 encoding and decoding, supports Chinese UTF-8.
Word Counter
Count characters, words, lines, and Chinese characters.
Countdown timer
Custom countdown timer with optional sound alert.
Reaction time test
Measure reaction time via color change, 3 attempts averaged.
QR Code Generator
Generate QR codes from text or URLs, downloadable as PNG.
Image Compressor
PNG/JPG/WEBP image compression, processed locally.
Tool categories
Calculators
Mortgage, income tax, unit conversion, countdown timer, reaction test, and everyday tools
About ToolHub Tools
ToolHub is a free online tool platform with 22+ common utilities across developer, text, calculator, creator, image, and color categories. All tools run locally in your browser without uploading your data to the server.
Whether you need JSON formatting, timestamp conversion, Base64 encoding, QR code generation, image compression, or word counting, ToolHub helps you finish common tasks quickly.
The tool collection is continuously improved. If you have suggestions or requests, please contact us from the About page.