Useful tools that run in your browser

Financial calculators and utilities for developers. All free, no sign-up and nothing you type ever leaves your device.

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Calculators

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Everyday and financial calculators for interest, loans, percentages and fuel.

Compound interest calculator

Project how an investment grows over time.

Percentage calculator

Solve the four most common percentage problems.

Loan calculator

Find the installment of a loan using the Price table.

Fuel calculator

Compare ethanol and gasoline and work out the cost per km.

Rule of three calculator

Solve a simple rule of three for the unknown value.

Simple interest calculator

Calculate simple interest and the final amount.

Date calculator

Add or subtract days, months and years from a date.

Age calculator

Find the exact age from a date of birth.

Developer tools

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Utilities to format, validate and convert data without sending anything anywhere.

JSON Formatter

Format, validate and minify JSON in your browser.

Base64 Encoder / Decoder

Convert text to Base64 and back.

UUID Generator

Generate UUID v4 values in bulk, with or without hyphens.

JWT Decoder

Inspect the contents of a JSON Web Token.

Timestamp Converter

Convert a Unix timestamp to a date and back.

URL Encoder / Decoder

Encode and decode URLs and URL components.

Regex Tester

Test regular expressions and see matches in real time.

Text Diff

Compare two texts and see the differences line by line.

Text tools

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Count, transform and clean up text right in the browser, with nothing copied to a server.

Character and word counter

Count characters, words, lines and reading time.

Case converter

Turn text into UPPERCASE, lowercase, title case and more.

Slug Generator

Create friendly URLs from any text.

Remove duplicate lines

Clean lists by removing repeated and empty lines.

Image tools

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Compress, resize and convert images on your own device. Your files never leave your computer.

Compress image

Shrink JPG, PNG and WebP files without visible quality loss.

Resize image

Change width and height with the ratio locked or free.

Convert image (JPG, PNG and WebP)

Convert between JPG, PNG and WebP.

Crop image

Crop an area of the image or apply ready-made ratios.

Rotate and flip image

Rotate by 90°, 180° and 270° or flip horizontally.

Favicon generator

Create favicon.ico and PNGs in every size you need.

Image color palette

Extract the dominant colors and copy the hex codes.