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 calculators- Download Time CalculatorHow long will it take?
- File Size ConverterBytes ↔ KB ↔ MB ↔ GB ↔ TB
- Color Code ConverterHEX ↔ RGB ↔ HSL ↔ HSV
- Aspect Ratio CalculatorScale & reduce dimensions
- Screen PPI CalculatorPixels per inch from resolution
- Password EntropyPassword strength in bits
- Base64 Encode & DecodeEncode text to base64 and decode base64 back to text
- URL EncoderPercent-encode and decode URLs and query strings
- Unix TimestampConvert between Unix epoch seconds and ISO 8601 datetimes
- Hash & ChecksumGenerate SHA-1, SHA-256, SHA-384, and SHA-512 digests of text
- JSON FormatterFormat, validate, and minify JSON with helpful error messages
- Color Contrast CheckerCheck WCAG AA/AAA contrast ratio between two colors
- CSS ClampGenerate responsive CSS clamp() values for fluid typography
- DPI & Print SizeCompute pixel size, print size, and image resize math
- Regex TesterTest JavaScript regular expressions against sample text with match groups
- QR Code GeneratorGenerate styled QR codes from text or URLs with PNG and SVG download.
- RSA DemonstratorEducational RSA key generation, encryption, and decryption
- IP Subnet CalculatorIPv4 CIDR network, broadcast, and host range