About SmallToolbox

Online, lightweight, free toolbox to help you solve various problems.

What is SmallToolbox?

SmallToolbox is a curated collection of lightweight online tools built to solve real problems — fast, privately, and without the bloat. Whether you're a developer decoding a JWT, a designer checking an aspect ratio, or just someone who needs a quick percentage calculation, every tool shares one philosophy: simple, private, and it just works.

Project Statistics

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Online Tools
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Privacy Safe

Features

Privacy First

All tools run entirely in your browser. Your data never leaves your device — no servers, no logs, no tracking.

Lightning Fast

No server round-trips. Get instant results with pure client-side processing — type and see the answer immediately.

Multi-language

Fully localized in English, Korean, Spanish, Simplified Chinese, and Traditional Chinese. More languages on the way.

Dark Mode

Switch between light, dark, or system-follow mode. Easy on the eyes, day or night.

Frequently Asked Questions

No, never. All tools run entirely in your browser — your data is processed locally and never touches our servers. No uploads, no logs, no tracking.

Yes, completely free. No registration, no subscription, no hidden fees. We believe useful tools should be accessible to everyone, plain and simple.

We'd love to hear from you! Send us an email at zx2324837581@gmail.com or open an issue on our GitHub repository. We read every suggestion and use them to guide what we build next.

Absolutely. We use well-tested algorithms and formulas, and all tools go through rigorous validation. That said, for critical financial or legal decisions, we recommend consulting a professional.

Nothing at all. Just open your browser, visit the site, and start using any tool instantly. Works on desktop, tablet, and mobile.

SmallToolbox works on all modern browsers — Chrome, Firefox, Safari, and Edge. Keep your browser up to date for the best experience.

Yes! SmallToolbox is a Progressive Web App (PWA). Once you've visited the site, you can install it on your device and use most tools without an internet connection. All processing happens locally in your browser.

No native app yet, but you can install SmallToolbox as a PWA on your phone — it works just like a native app. On iOS, tap the Share button and select 'Add to Home Screen'. On Android, you'll see an install prompt.

We add new tools regularly based on user requests and needs. Have an idea? Let us know — your suggestion might be next!

While SmallToolbox isn't open source at the moment, we greatly value your input. The best way to contribute is by sharing your feedback or tool ideas via email at zx2324837581@gmail.com.

Contact Us

Got an idea for a tool? Found a bug? Just want to say hi? We'd love to hear from you. Every piece of feedback helps make SmallToolbox better for everyone.