Simple, useful tools
Free, fast, and private. Everything runs in your browser.
Explore tools for editing text, checking calculations, converting values, generating assets, and handling common developer tasks without extra setup.
43 free tools. No login. No tracking.
Browse by category
Category pages help you find related tools for the job you are trying to solve.
Text tools
Use these text tools to clean copy, compare drafts, count words, and transform formatting without leaving your browser.
Finance tools
These finance tools help you estimate payments, project savings, split bills, and test common money scenarios quickly.
Converter tools
Convert units, measurements, sizes, temperatures, and currencies with fast tools that are easy to reuse throughout the day.
Date and time tools
This category focuses on date based calculations that are easier to check with a purpose built tool than with manual counting.
Generator tools
These generator tools help you create secure values, demo data, random selections, and reusable assets without extra setup.
Developer tools
The developer tools collection helps you inspect, encode, decode, format, and transform common technical values without leaving the browser.
Calculator tools
Calculator tools give you focused answers for common business, finance, and everyday number questions without a bulky spreadsheet.
Word counter
Count words, characters, sentences, paragraphs, and estimate reading time.
Case converter
Convert text between uppercase, lowercase, title case, camelCase, snake_case, and more.
Lorem ipsum generator
Generate placeholder lorem ipsum text by paragraph, sentence, or word count.
Find and replace
Bulk replace matching text across a large block with optional regex and case-sensitive matching.
Text diff
Compare two text blocks side by side and spot added, removed, or changed lines.
Markdown preview
Write Markdown and preview the rendered result live in your browser.
Remove duplicate lines
Deduplicate lines while keeping the first occurrence of each entry.
Sort lines
Sort lines alphabetically, reverse the order, or shuffle them randomly.
Line counter
Count total, empty, and non-empty lines and measure the longest line.
Slug generator
Turn text into a clean, URL-safe string or slug with your preferred separator.
Percentage calculator
Calculate percentages with three modes: X% of Y, percentage change, and X is what % of Y.
Tip splitter
Calculate the tip and split a bill evenly between any number of people.
Compound interest calculator
Project compound growth with an initial deposit, recurring contributions, and a fixed annual rate.
Loan payment calculator
Estimate monthly loan payments, total repayment, and interest for a fixed-rate loan.
Salary to hourly converter
Convert annual salary into hourly, weekly, biweekly, and monthly pay.
Savings goal calculator
Calculate how much you need to save each month to reach a target balance.
Break-even calculator
Find the units and revenue needed to cover your fixed and variable costs.
Temperature converter
Convert between Fahrenheit, Celsius, and Kelvin instantly.
Unit converter
Convert length, weight, volume, and area between metric and imperial units.
Currency converter
Convert between major currencies with live exchange rates from Frankfurter.
Number base converter
Convert integers between binary, octal, decimal, and hexadecimal.
Roman numerals converter
Convert standard Roman numerals to numbers and numbers to Roman numerals.
Cooking measurement converter
Convert common kitchen volume measurements like cups, tablespoons, teaspoons, and milliliters.
Shoe size converter
Compare approximate US, UK, and EU shoe sizes for women, men, and kids.
Clothing size converter
Compare approximate international, US, UK, and EU clothing sizes for women and men.
Age calculator
Calculate your exact age and find out how many days until your next birthday.
Password generator
Generate secure, random passwords with customizable length and character sets.
UUID / GUID generator
Generate version 4 UUIDs in bulk with optional GUID-style formatting.
QR code generator
Generate QR codes for URLs, plain text, or contact cards directly in your browser.
Color palette generator
Build complementary, triadic, and analogous palettes from any valid base color.
Random picker
Choose one or more random items from a list you provide, with optional repeats.
Fake data generator
Generate sample names, email addresses, phone numbers, and addresses for demos and testing.
Hash generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for any text input.
Base64 encoder / decoder
Encode text to Base64 or decode Base64 back to plain text.
JSON formatter
Prettify, validate, and minify JSON with configurable indentation.
URL encoder / decoder
Percent-encode text for URLs or decode encoded strings back to readable text.
HTML entity encoder / decoder
Encode special characters as HTML entities or decode entities back to readable text.
JWT inspector
Decode JWT header and payload locally and validate the token's basic structure.
Regex tester
Test regular expressions against sample text with live match highlighting and capture group output.
Color code converter
Convert colors between HEX, RGB, HSL, and HSV formats instantly.
Cron expression explainer
Explain cron schedules in plain English and break down each cron field.
HTML to Markdown converter
Convert HTML markup into clean Markdown directly in your browser.
CSV to JSON converter
Parse CSV data into JSON arrays or objects with header row support.
Why people use JustUsefulTools
Fast to open
Each page is built for a single job so you can get in, get the answer, and move on quickly.
Easy to reuse
Most tools are useful for repeat workflows like editing content, checking calculations, or converting values.
Designed for the browser
Many tools work locally in the browser, which makes them practical for quick tasks and private drafts.
Frequently asked questions
What kinds of tools are available on JustUsefulTools?
The site includes text tools, finance tools, converters, generators, developer utilities, and focused calculators for common everyday tasks.
Do I need an account to use the tools?
No. The site is designed so you can open a tool, use it immediately, and move on without creating an account.
Do the tools work on mobile devices?
Yes. The tools are built to work on desktop and mobile so you can handle quick tasks from a laptop, tablet, or phone.