The Zen of Tools, Less is More
20+ free online tools. Privacy-first, no upload needed. All processing happens in your browser.
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JSON Formatter
Online JSON formatting, validation, and compression tool. Features syntax highli...
Base64 Encoder / Decoder
Online Base64 encoding and decoding tool. Supports text-to-Base64 conversion. Yo...
QR Code Generator
Free online QR code generator. Supports URL, text, contact info and more. Custom...
Image Compressor
Online image compression tool. Supports PNG, JPEG, and WebP formats. All compres...
UUID Generator
Online UUID v4 and ULID generator. Supports batch generation and one-click copy....
Word Counter
Online word and character counting tool. Real-time stats for characters, words, ...
📂 All Categories
Developer Tools
JSON, Base64, RegEx and other developer utilities
6 toolsText Tools
Text diff, word counter and text processing tools
3 toolsImage Tools
Image compression, QR code generator and image utilities
2 toolsCrypto & Encoding
MD5, SHA hash, URL encoding and decoding tools
3 toolsCalculators
Mortgage, BMI and other practical calculators
6 toolsLife Tools
Zodiac, constellation and daily life utilities
1 toolsPDF Tools
PDF merge, split, compress and document processing tools
3 toolsWhy ToolZen?
Privacy First
All tools run locally in your browser. Your data never leaves your device.
Blazing Fast
Pure static pages with global CDN. Instant results, no waiting.
Completely Free
All tools are free forever. No hidden fees, no feature limits.
Latest Articles
Online tool guides and practical tips
Is Your Password Strong Enough? A Guide to Secure Passwords
What makes a password truly secure? How long should it be? How often should you change it? Includes an online password generator for creating strong random passwords instantly.
Equal Payment or Equal Principal? Let a Mortgage Calculator Do the Math
A detailed comparison of equal monthly payment vs. equal principal repayment methods. Use a mortgage calculator to see the total interest and monthly payment for each option.
The Complete Guide to Online Image Compression
How to dramatically reduce image file size without noticeable quality loss. Compression strategies compared across PNG, JPEG, and WebP formats.
FAQ
Are ToolZen tools really free?
Yes, all tools are free forever. We plan to generate revenue from ads in the future, but will never charge users.
Is my data safe?
Absolutely. All processing happens in your browser. Your data never leaves your device.
Do I need to register?
No. All tools can be used directly without registration.