Tech & Digital Calculators
Developer and digital tools for encoding, hashing, color, screen and file calculations. Fast, precise and easy to share by URL.
View all calculatorsDownload Time Calculator
How long will it take?
File Size Converter
Bytes ↔ KB ↔ MB ↔ GB ↔ TB
Color Code Converter
HEX ↔ RGB ↔ HSL ↔ HSV
Aspect Ratio Calculator
Scale & reduce dimensions
Screen PPI Calculator
Pixels per inch from resolution
Password Entropy
Password strength in bits
Base64 Encode & Decode
Encode text to base64 and decode base64 back to text
URL Encoder
Percent-encode and decode URLs and query strings
Unix Timestamp
Convert between Unix epoch seconds and ISO 8601 datetimes
Hash & Checksum
Generate SHA-1, SHA-256, SHA-384, and SHA-512 digests of text
JSON Formatter
Format, validate, and minify JSON with helpful error messages
Color Contrast Checker
Check WCAG AA/AAA contrast ratio between two colors
CSS Clamp
Generate responsive CSS clamp() values for fluid typography
DPI & Print Size
Compute pixel size, print size, and image resize math
Regex Tester
Test JavaScript regular expressions against sample text with match groups
QR Code Generator
Generate styled QR codes from text or URLs with PNG and SVG download.