About Kitfolio
Kitfolio is a collection of browser-based tools that help PMs, designers, developers, marketers, job seekers, office workers, and small business owners quickly solve the small, repetitive problems they hit during the workday.
What the site does
Kitfolio gathers small tools: calculators, generators, converters, formatters, and utilities: that you need often but would rather not hunt for each time. It covers repetitive tasks across different work situations: counting characters, formatting JSON, calculating take-home pay, working out growth and ad metrics, generating QR codes, merging PDFs.
Each tool has one clear purpose and is ready the moment you open the page, with no heavy software to install and no account to create.
How it works (your input never leaves your browser)
Every Kitfolio tool runs inside your browser, not on a server. The text, numbers, and files you enter are never uploaded to Kitfolio's servers: all calculation and conversion happens on your device.
There is no sign-up or login, and we do not directly collect personal information such as names or email addresses. The site does use third-party services for analytics, advertising and web fonts, and those may process connection information or cookies separately. In other words, what you enter into a tool is never transmitted, but that does not mean no network communication happens while you use the site. The Privacy Policy sets out exactly which is which.
Why we build it
Good tools remove small frictions and protect the flow of your day. Kitfolio's goal is not to publish a lot of content, but to keep adding practical tools that solve recurring work problems for free, fast, and privately.
Kitfolio is planned and run by VIVASPACE, prioritizing tools that were genuinely needed in real work. Tool suggestions and feedback are always welcome: please reach out via the Contact page.
Who runs Kitfolio
Kitfolio is planned, built, operated and written by VIVASPACE. There are no outside contributors and no syndicated or auto-generated content, so responsibility for every tool and every article on the site rests with the operator.
The source code is public in the GitHub repository, so you can check exactly how each tool calculates. Questions go to the email address below and are answered directly.
How tools are built and verified
Only tools we would use ourselves. Search volume alone is not a reason to add a tool; problems actually hit repeatedly in real work come first.
Calculation logic is separated from the UI and tested. Where an official standard exists, as with Korean take-home pay, the rate and policy data lives in its own module and each component of the calculation is checked against its official formula by automated tests. The benchmark is the formula published by the responsible authority, not matching totals with another calculator site.
Tools that depend on external standards show their sources and verification date. Anything built on tax rates, insurance rates or platform policies states which point in time it reflects and when it was last checked against official material. Only primary sources from government bodies and public institutions are used: never personal blogs or third-party calculators.
Limitations are published alongside the tool. Each tool page states what it cannot handle and the conditions under which its results diverge, so an estimate is not mistaken for a confirmed figure.
How time-sensitive tools are kept current
Data that changes by effective date, such as insurance and tax rates, is not filed under a single year but managed as effective periods with a start and end date. Korea's four major insurance rates change every January while the National Pension income ceiling and floor change every July, so the two live in separate period tables and the calculator picks whichever rules apply to today's date.
When a rule changes, the official source is checked, a new period is added, the verification date is updated, and the related tools and articles are revised together. Past periods are kept rather than deleted, because there are times you need to check a figure as it stood on an earlier date.
Reporting errors, and how corrections are handled
Reporting an error: if a result looks wrong or an explanation does not match the facts, email the address below or open a GitHub issue. Including which tool, which inputs and what result you saw makes it much faster to reproduce.
Correction policy: calculation errors and factual errors are fixed as soon as they are confirmed. Articles whose substance changed carry an updated date, and tools whose underlying data changed carry a new verification date, so you can see when something changed. Typo fixes and wording changes that do not affect meaning are not separately marked.
Retiring a tool: if a tool has to be removed, its URL stays in place and points to a replacement so existing links do not break.