About All You Need

A hub for the small utilities you often need but hate searching for every time. No install, no login — everything runs right in your browser.

Why we built it

Small but repetitive tasks — counting characters, checking byte limits, estimating speaking time, organizing receipts — eat up more time than you'd think. This site offers lightweight tools to get those done in seconds.

How we operate

  • We prioritize features you can use instantly, without logging in.
  • Files and input are processed in your browser whenever possible.
  • Every tool clearly explains how it works, its basis, examples, and FAQs.
  • Ads only go where they don't get in the way of using the tools.

How we operate and review

All You Need is an independent web-tools service built to make everyday, repeated calculations easy. We are not affiliated with, or endorsed by, any government agency or financial institution.

Content about policy, tax, insurance, and pensions is reviewed against public materials from government and public bodies, and each page and article shows the basis year and last review date.

All results are for reference only. Before any filing, claim, or contract, confirm the figures with the relevant institution's official calculation.

Tools available now

The early lineup starts with tools that have steady demand and run entirely in the browser.

  • Character Counter — Instantly check the character and word count of essays, blog posts, and assignments.
  • Byte Calculator — See how many bytes your text takes and stay within submission limits.
  • Reading Time Calculator — Estimate how long a blog post, speech script, or announcement takes to read.
  • UTM Link Builder — Build UTM links to separate traffic sources for blog, social, and email campaigns.
  • Receipt A4 Organizer — Turn scattered receipt images into a single sheet ready to submit.
  • Resume Character Counter — Match each resume field's character limit with a real-time count of characters (with/without spaces) and how many remain.
  • Korean Byte Calculator — Compare how many bytes Korean text takes in UTF-8 versus EUC-KR at a glance.
  • VAT Calculator — Split 10% value-added tax out of a supply amount or a gross total automatically.
  • Capital Gains Tax Calculator — Subtract expenses, the long-term holding deduction, and the basic deduction from a property gain, then apply progressive rates.
  • Take-home Salary Calculator — See your real monthly take-home pay after the four insurances and income tax are deducted from your salary.
  • Loan Repayment Calculator — Calculate monthly payment and total interest by loan amount, rate, and term in two repayment modes.
  • Severance Pay Calculator — Estimate severance pay from your start/end dates and last 3 months of wages, based on average wage.
  • Case Converter — Convert text to uppercase, lowercase, title, camelCase, snake_case, and more, instantly.
  • Password Generator — Create strong random passwords right in your browser with adjustable length and character sets.
  • Image to PDF — Combine several JPG or PNG images into one PDF in your browser. No upload, no install.
  • JSON Formatter — Format, validate, and minify JSON instantly in your browser.
  • Age Calculator — Enter a date of birth to get exact age and the days until the next birthday.
  • Basic Pension Eligibility Checker — Enter income and assets to estimate eligibility for Korea's Basic Pension against the 2026 threshold.
  • Inheritance & Gift Tax Calculator — Estimate inheritance or gift tax by subtracting deductions and applying progressive rates.
  • Health Insurance Calculator — Enter your monthly salary to calculate the 2026 employee health and long-term care premiums.
  • BMI Calculator — Calculate your BMI (body mass index), its category, and the healthy weight range for your height. A simple starting point for weight awareness.
  • Discount Calculator — Work out the final price and your savings from an original price and discount. Stack a second discount to see the real effective rate.
  • Tip Calculator — Split a bill fairly: enter the amount, tip percent, and party size to see the tip, total, and per-person share.
  • Percentage Calculator — Find a percent of a number, a ratio, and a percentage change in one place — the three percentage calculations you use most, from discounts to tax to scores.
  • Interest Calculator — Calculate simple and compound interest, plus the total maturity value, from a principal, rate, and time. Useful for gauging savings or loan interest.
  • Date Difference Calculator — See how many days, weeks, months, and years lie between two dates. Useful for countdowns, job tenure, and anniversaries.
  • Regional Health Insurance Calculator — Estimate the 2026 regional (self-employed/retiree) health insurance premium from annual income and property.

Need a tool that isn't here yet? Let us know via Contact and we'll build it next.