Fast, free developer tools that run entirely in your browser.
Your data never leaves your browser.
Base64 Encode / Decode
Convert text to Base64 and back. Full Unicode support.
{}JSON Formatter
Format, validate and minify JSON with precise error location.
%URL Encode / Decode
Percent-encode or decode URLs and query parameters.
JWTJWT Decoder
Decode JWT header & payload, check expiration. Nothing is sent anywhere.
IDUUID Generator
Generate UUID v4 — single or in bulk, with formatting options.
TSUnix Timestamp Converter
Convert Unix timestamps to human dates and back.
#Hash Generator
MD5, SHA-1, SHA-256 and SHA-512 of any text — all at once.
&;HTML Entities Encode / Decode
Escape special characters for HTML, or turn & back into &.
/·/Regex Tester
Test patterns with live highlighting. Freeze-proof via Web Worker.
±Text Diff
Compare two texts line by line — see exactly what changed.
🎨Color Converter
HEX ↔ RGB ↔ HSL, with a live preview and color picker.
***Password Generator
Strong random passwords with your rules — length, symbols, count.
Y{}JSON ↔ YAML Converter
Convert between JSON and YAML in both directions, instantly.
,{}CSV ↔ JSON Converter
CSV to JSON objects and back — quotes and delimiters handled.
M↓Markdown Preview
Write Markdown, see rendered HTML live — with copyable HTML output.
SQLSQL Formatter
Beautify messy SQL — supports MySQL, PostgreSQL, SQLite, T-SQL and more.
*5*Cron Expression Parser
Explain any cron expression in plain language + next run times.
▣QR Code Generator
Text or URL → QR code, downloadable as PNG. Generated locally.
⧩Smart Data Filter
Filter & query JSON, CSV or logs — no code, no upload.
</>XML ↔ JSON Converter
Convert XML to JSON and back, right in your browser.
Y/TYAML ↔ TOML Converter
Convert config files between YAML and TOML formats.
📏Distance Converter
Convert between mm, cm, m, km, inches, feet, yards and miles.
⚖️Weight Converter
Convert between mg, g, kg, tonnes, ounces, pounds and stone.
🧪Volume Converter
Convert between mL, liters, cups, US/UK gallons and more.
💾File Size Converter
Convert bytes, KB, MB, GB and TB — with a binary/decimal toggle.
ⅩⅫRoman Numeral Converter
Convert numbers to Roman numerals and back.
🎂Age Calculator
Calculate exact age in years, months and days between two dates.
🏠Loan Calculator
Estimate monthly payment, total paid and total interest on a loan.
📈Compound Interest Calculator
Project investment growth with compounding and optional monthly contributions.
🧾VAT Calculator
Add or remove VAT/sales tax, with a reference table of common rates.
💵Tip Calculator
Calculate a tip and split the bill between any number of people.
🖱️CTR Calculator
Calculate click-through rate, or the clicks needed to hit a target CTR.
📊ROAS Calculator
Calculate return on ad spend, or the ad budget needed for a target ROAS.
%Percentage Calculator
Three common percentage questions: X% of Y, X is what % of Y, and % change.
x²Quadratic Equation Solver
Solve ax² + bx + c = 0, including real and complex roots.
💹ROI Calculator
Calculate return on investment as a percentage and net profit.
➕Simple Interest Calculator
Calculate simple (non-compounding) interest on a principal.
🏷️Discount Calculator
Calculate a sale price from a discount, or recover the original price.
🎯Savings Goal Calculator
Find out how long it takes to reach a savings goal.
💲CPC Calculator
Calculate cost per click, or the clicks affordable within a budget.
🎯Conversion Rate Calculator
Calculate conversion rate, or the conversions needed for a target rate.
🔢Prime Number Checker
Check if a number is prime, and see its prime factorization.
σStandard Deviation Calculator
Calculate mean, variance and standard deviation (population or sample).
📦Markup Calculator
Calculate a selling price from cost and markup %, or the reverse.
🤝Commission Calculator
Calculate sales commission, or the sale needed for a target commission.
💼Salary Calculator
Convert between hourly rate and annual salary.
⚖️Break-Even Calculator
Find how many units you need to sell to break even.
GCFGCF & LCM Calculator
Find the greatest common factor and least common multiple of two or more numbers.
🌀Fibonacci Generator
Generate the Fibonacci sequence up to any number of terms.
📉NPV Calculator
Calculate net present value from a discount rate and a series of cash flows.
x̄Mean, Median & Mode Calculator
Calculate the mean, median and mode(s) of a list of numbers.
🏡Mortgage Calculator
Estimate mortgage payments from home price, down payment and rate.
🌴Retirement Calculator
Project your retirement savings balance from age, contributions and returns.
💳Debt Payoff Calculator
Find out how long it takes to pay off a debt with a fixed monthly payment.
💰Net Worth Calculator
Calculate your net worth from a list of assets and liabilities.
🚗Car Payment Calculator
Estimate car loan payments from price, down payment, trade-in and rate.
nPrPermutation & Combination Calculator
Calculate permutations (nPr) and combinations (nCr) for n items and r chosen.
zZ-Score Calculator
Calculate a z-score, or convert a z-score back to a raw value.
📺CPM Calculator
Calculate cost per 1000 impressions, or impressions affordable for a budget.
📐IRR Calculator
Calculate internal rate of return from a series of cash flows.
⏱️Payback Period Calculator
Find out how long an investment takes to pay for itself.
🆘Emergency Fund Calculator
Find how many months your savings would cover, or your savings target.
📉Churn Rate Calculator
Calculate customer churn rate and retention rate.
🔁MRR Calculator
Calculate monthly and annual recurring revenue from customers and ARPU.
🎯CAC Calculator
Calculate customer acquisition cost, or customers affordable for a budget.
a²+b²Pythagorean Theorem Calculator
Find the hypotenuse or a missing leg of a right triangle.
⭕Circle Calculator
Calculate radius, diameter, circumference and area from any one value.
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