Free · Private · No sign-up

Smart tools. Straight answers.

I'm Ronald Reeves. I build fast, no-nonsense tools, calculators and references in English, Spanish and French, for developers, planners and anyone who needs a clear answer right now.

Popular: JSON Formatter & Prettifier Password Generator QR Code Generator Image Compressor Unit Converter Hub

Browse popular tools All calculators

297 Tools 300 Calculators 11 Forensics 507 Reference

3 Languages: EN · ES · FR

Free, no sign-upNo accounts, no paywalls, nothing to install.

Private by designMost tools run in your browser, so your files and inputs stay on your device. Lookup tools send only the query they need.

English, Spanish, FrenchEvery page is available in all three languages.

Explained, not just answeredTools come with plain-language notes and an FAQ.

Explore by section

Jump straight to a category.

Tools

297

Formatters, converters, generators, checkers and lookups for developers, designers and IT.

Web 48 Image 37 PDF 8 Conversion 51 Network 33 Development 71 Other 49

Calculators

300

Money, health, math and network calculators with the formula shown.

Financial 91 Health 53 Math 72 Network 6 Other 78

Forensics

In-browser analyzers for images, documents, packet captures, email, logs and more.

Image Audio Network Document Binary Email Browser Video Executable System Logs

Reference

507

Cheat sheets, guides, how-tos, comparisons and a glossary.

Cheat Sheets 59 Guides 39 How-to Guides 25 Comparisons 22 Glossary 362

Blog

Notes on the tools, the math behind them and what I am building.

AI 1 Other 1 Space 4 Travel 1 Updates 12

Popular tools

View all

JSON Formatter & Prettifier Prettify and format messy JSON instantly. Password Generator Generate high-entropy, secure passwords instantly with our free online tool. QR Code Generator Generate a downloadable QR code from any text or URL. Image Compressor Shrink an image's file size by re-encoding it at an adjustable quality level. Unit Converter Hub Convert any unit instantly. IP Address Lookup Check your IP address or query any IPv4/IPv6 address to find its geographic location.

Popular calculators

View all

Mortgage Calculator The Mortgage Calculator helps estimate the monthly payment due along with other financial. BMI Calculator Calculate your Body Mass Index (BMI) and understand your health status with our. Percentage Calculator A free online percentage calculator with four modes: X% of Y, X is what % of Y. Compound Interest Calculator Calculate the estimated future value of your savings or investments with compound. Calorie Calculator Estimate your daily calorie needs using science-backed BMR equations. Age Calculator Calculate your exact chronological age from any birth date.

Learn and Look Things Up

Cheat sheets, guides, how-tos, comparisons and a glossary: quick answers and clear explanations for developers, IT people and anyone curious how things work.

View all

Latest Insights

View all

Space

An inside look at the U.S. Space Force's VICTUS HAZE tactically responsive space mission, built on the Rocket Lab Photon spacecraft, and my contributions across cloud software architecture, networking, hardware testing, and HITL support.

Ronald Reeves

2026-11-02

Updates

Highwayman

Another stretch of road: security, PDF, web and developer tools plus calculators for money, health, math and networking - the highlights of 150+ additions since the last update.

Ronald Reeves

2026-10-27

Cerebras Cloud Free Tier: API Setup, Quotas, and Model Comparison

Learn how to use Cerebras Cloud’s free trial with Python or the OpenAI SDK, compare model quotas, understand token limits, and test Qwen3.8 27B vs gpt-oss-120b.

Ronald Reeves

2026-10-17