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 19 categories.
Crypto 19
Free hash functions (MD5, SHA-256, Argon2), bcrypt password verification, secure password and TOTP one-time password generation, plus classical cipher tools like Caesar, Vigenère, and Enigma. Handy for development, learning, and security testing.
Developer Tools 83
Free developer tools: JSON and CSV formatting and conversion, Base64, JWT verification, number bases, cron expressions, and SEO tag validation.
Text 25
Free text tools: character and word counting, naming convention conversion, joyo kanji reference, Markdown preview, slang and dialect converters, emoji and fancy fonts, Morse code, semaphore, QR code generation, and Chinese calligraphy font generation.
Math 49
Free calculation tools ranging from a calculator, sales tax, BMI, and compound interest, to solving systems of equations, function graphs, sequences, prime checks, pie charts, geometry, probability and expected values, Fourier series visualisation, and size/unit conversions like shoe and ring sizes.
Date/Time 35
Free date and time tools: world clock, timer, stopwatch, Japanese holidays, rokuyo, and era calendar, age/yakudoshi/kanreki calculators, customary gift-money amounts for Japanese ceremonies, plus date difference, business day, and countdown calculators.
Design 34
Free design tools covering color code conversion (RGB, HEX, HSL), contrast and color-blindness checks, CSS gradient and layout generators, image compression and playful editing tools like meme generators, plus paper size reference charts and dummy sample PDF generation.
Network 33
Free network tools for URL encoding and a REST API tester, IP address and domain WHOIS lookups, bandwidth, port, and MAC address vendor reference tables, plus DKIM, DMARC, and SSL certificate checks for email and domain security.
Money 155
Free money calculators for take-home pay, furusato nozei (hometown tax) donations, loans, and investment simulations, utility and vehicle costs, everyday calculators like VAT and bill splitting, plus lottery and gambling odds and expected-value calculators.
Business 61
Free calculators for SaaS and startup metrics, B2B sales pipeline metrics, the creator economy, and HR and business management — from MRR/ARR to hiring.
File Operations 13
Free file tools: ZIP and TAR.GZ compression and extraction, image-to-PDF conversion, PDF organising, compression, rasterising, redaction, and watermarking, CSV encoding repair, and direct device-to-device file and text sharing.
Chemistry 11
Free chemistry calculators spanning four areas: stoichiometry, solutions, gases, and the elements. Covers molecular weight, equation balancing, pH, the ideal gas law, the periodic table, and radioactive half-life for study and practical work.
Physics 16
Free physics calculators, from mechanics to Ohm’s law, resistance networks, and component colour codes — for study and for electronics work.
Data 18
Free reference lookups for postal codes, municipalities, bank codes, and country codes, plus check-digit validation for IBAN/BIC, VINs, barcodes, ISBNs, and national ID numbers (US routing numbers, Canadian SIN, Brazilian CPF, Chilean RUT, Spanish DNI), phone number formatting, and airport/port codes.
Music 11
Free tools for musicians: metronome, tuner, circle of fifths, capo chart, chord progressions, and BPM-to-ms conversion — 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, along with a screen recorder.
Health 16
Free health tools: BMR, calories, and body fat calculators, fertility and cycle charts, child growth checks, and a health checkup reference.
Hardware & Standards 4
A free reference collection for comparing hardware standards such as LAN cables, Wi-Fi, USB, and keyboard layouts. Model numbers and version names alone rarely explain the real differences in speed, range, or compatibility, so each tool lays them out side by side.
Daily Life 14
Free everyday tools: travel time and fuel cost, pet age and feeding, DIY material quantities, recipe measurement conversion, a laundry symbol guide, and a personal carbon footprint estimator.
Games & Events 4
Free tools for events and tournaments: a random name picker wheel, printable PDF bingo cards with a bingo caller, random or balanced team generator, and tournament brackets.
Tool Page Layout
Tool pages are made up of the sections below. Sections with nothing meaningful to say are omitted on a per-tool basis.
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.
Who runs Toolbase
Toolbase is planned, built, and operated by the company below. Some of our tools perform calculations governed by law, such as taxes and social insurance contributions, so we state plainly who is responsible for them.
| Legal name | Codebase Inc. (株式会社コードベース) |
|---|---|
| Address | THE CASK GOTANDA 902, 2-5-2 Higashi-Gotanda, Shinagawa-ku, Tokyo 141-0022, Japan |
| Founded | October 20, 2017 |
| Representative | Seiya Tajikara (田力 誠也), Representative Director |
| Business | Software development and cloud services |
Editorial policy
Because we publish calculations that rest on tax law and social insurance rules, we decided in advance how figures are sourced and maintained. Setting out how the site is built should give you something concrete to check it against.
- Statutory figures are taken from primary sources
- Tax rates, insurance contribution rates and deduction amounts are entered only after consulting the primary material published by the responsible ministry or public body, and each tool page shows the source and the period it applies to. Explainer sites and aggregators are never cited as the source.
- Figures we cannot verify are left blank rather than guessed
- Where a primary source could not confirm a value, we leave it unregistered instead of filling in something plausible. A missing figure is safer than a confident wrong one.
- Expiry of applicable periods is checked automatically
- Every registered figure carries the period it applies to, and an automated check flags the ones approaching expiry so they get revisited. The aim is to avoid the situation where a rule changes and nobody notices.
- Public datasets are refreshed monthly
- Bank codes, municipalities and postal codes are pulled in automatically each month, following the publication schedule of the bodies that maintain them.
- Each page shows when it was last updated
- The date a tool was last revised appears near the top of its page, so you can judge how current the information is for yourself.
- We welcome corrections
- If you spot an error in a figure or an explanation, please tell us through the feedback form. We check it and fix it.
- This is not a substitute for professional advice
- Results are estimates. For anything that turns on individual circumstances, such as a tax liability or a benefit entitlement, please confirm with the relevant authority or a qualified professional before acting on it.
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.
Send feedback