Interactive Utilities
Client-Side Browser Tools
Fast calculators and utilities that run entirely on your device. No sign-ups, and nothing you enter is sent anywhere.
- DeveloperLaunch tool
Base64 Encoder and Decoder
Encode text to Base64, or decode a mystery string to see what is actually inside it.
- TextLaunch tool
Case Converter
Transform text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, or kebab-case.
- CalculatorsLaunch tool
Compound Interest Calculator
See how savings grow over time with a monthly contribution and a year-by-year table.
- CalculatorsLaunch tool
Date Difference and Age Calculator
Find days, weeks, business days, and age milestones between two calendar dates.
- CalculatorsLaunch tool
Discount and Sales Tax Calculator
Find the final price after retail discounts, double markdowns, and local sales tax.
- ConvertersLaunch tool
File Size and Data Unit Converter
Convert Bytes, KB, MB, GB, TB, and binary kibibytes, with transfer times at common speeds.
- Files & imagesLaunch tool
Browser Image Resizer and Compressor
Resize and compress JPG or WebP images, with the before and after file sizes side by side.
- DeveloperLaunch tool
JSON Formatter and Validator
Prettify minified JSON, see the exact syntax error when it breaks, or minify it again.
- GeneratorsLaunch tool
Secure Password and Passphrase Generator
Create long random passwords, or multi-word passphrases you have some hope of remembering.
- CalculatorsLaunch tool
Percentage Calculator
Calculate percentages, increases, decreases, and fractions without doing algebra in your head.
- GeneratorsLaunch tool
QR Code Generator
Make static QR codes for a URL, plain text, or Wi-Fi login, and download the PNG.
- GeneratorsLaunch tool
Random Number and List Decision Picker
Pick random items from a list, roll dice, or generate random numbers within a custom range.
- DeveloperLaunch tool
Regular Expression Tester
Test JavaScript regular expressions against sample text, with highlighted matches and groups.
- TextLaunch tool
URL Slug and Clean Text Generator
Strip accents, drop stop words, and turn any headline into a clean URL slug.
- ConvertersLaunch tool
Temperature Converter
Convert between Fahrenheit, Celsius, and Kelvin with everyday reference points.
- TextLaunch tool
Word, Character, and Reading Time Counter
Count words, characters with and without spaces, sentences, paragraphs, and reading time.
- CalculatorsLaunch tool
Tip and Bill Splitter
Split restaurant checks, add tip percentages, and round evenly per person.
- ConvertersLaunch tool
Length and Weight Unit Converter
Convert metric to imperial measurements for baking, travel, packages, and dimensions.
- DeveloperLaunch tool
URL Encoder and Decoder
Encode query parameters and decode percent-encoded URLs safely.
- DeveloperLaunch tool
UUID v4 Generator
Generate cryptographically random UUID v4 identifiers in bulk or with uppercase formatting.