About Toolbase
Toolbase is a free collection of web tools for those moments when you think "I wish I had a tool for this" — at work, in study, or in daily life.
Every tool is completely free with no account or sign-up required.
Tool Categories
Tools are organized into 18 categories.
Crypto 18
Free hash functions (MD5, SHA-256, Argon2), bcrypt password verification, and secure password generation, plus classical cipher tools like Caesar, Vigenère, and Enigma. Handy for development, learning, and security testing.
Developer Tools 81
Free developer tools: JSON and CSV formatting and conversion, Base64, JWT verification, number bases, cron expressions, and SEO tag validation.
Text 19
Free text tools: character counting, naming convention conversion, slang and dialect converters, emoji and fancy fonts, Morse code, and QR code generation.
Math 44
Free calculation tools ranging from a calculator, sales tax, BMI, and compound interest, to function graphs, sequences, prime checks, pie charts, geometry, and size/unit conversions like shoe and ring sizes.
Date/Time 34
Free date and time tools: world clock, timer, stopwatch, Japanese holidays, rokuyo, and era calendar, age and yakudoshi calculators, plus date difference, business day, and countdown calculators.
Design 28
Free design tools for converting between color code formats such as RGB, HEX, and HSL, generating CSS gradients and shadows, converting image formats and calculating aspect ratios, generating favicons in multiple sizes, plus paper size reference charts and dummy sample PDF generation.
Network 32
Free network tools for URL encoding and a REST API tester, IP address and domain WHOIS lookups, bandwidth and port reference tables, plus DKIM, DMARC, and SSL certificate checks for email and domain security.
Money 113
Free money calculators for take-home pay, furusato nozei (hometown tax) donations, loans, and investment simulations, plus lottery and gambling odds and expected-value calculators.
Business 57
Free calculators for SaaS and startup metrics, the creator economy, and business management — from MRR/ARR to marketing and project metrics.
File Operations 8
Free file tools: ZIP and TAR.GZ compression and extraction, image-to-PDF conversion, PDF organising and compression, and CSV encoding repair.
Chemistry 11
Free chemistry calculators for study and practical work: molecular weight, pH, the ideal gas law, the periodic table, and more.
Physics 16
Free physics calculators, from mechanics to Ohm’s law, resistance networks, and component colour codes — for study and for electronics work.
Data 7
Free reference lookups for postal codes, municipalities, bank codes, country codes, airport codes, and port codes.
Music 10
Free tools for musicians: metronome, tuner, circle of fifths, capo chart, and chord progressions — for practice and for theory.
Media 11
Free browser tests for camera, microphone, and speakers, plus dead pixel, keyboard, reaction time, colour vision, and hearing tests.
Health 13
Free health tools: BMR, calories, and body fat calculators, running pace, sleep timing, pregnancy dates, and a health checkup reference.
Hardware & Standards 4
A free reference collection for quickly comparing hardware standards such as LAN cables, Wi-Fi, and USB.
Daily Life 6
Free everyday tools: travel time and fuel cost, an atmosphere layer visualiser, and pet age, body condition, and feeding calculators.
Tool Page Layout
Every tool page consists of four sections.
Meet Tool-kun (ツールくん)
The Toolbase mascot
- NameTool-kun
- RoleOfficial Toolbase mascot & apprentice tool builder
- HobbiesBuilding tools, sharing trivia
- Special skillDigging up facts nobody knew they needed
- Catchphrase"That can be automated."
- TraitEyes always darting around, scanning everything for the next tool idea
- DreamTo make every tiny annoying task in the world disappear
Tool-kun quietly shows up across Toolbase — and yes, he's the one writing those "Side Note" trivia sections. He gets a little too excited once he starts researching, which is why the articles sometimes run long. The reason he's always looking upward in the footer? He's thinking up the next tool idea.
We'd love your feedback
"I wish there was a tool for this." "This part is hard to use." "I found a bug." — all input is welcome. Your feedback directly shapes what we build next.
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