Percent-encode text for use in URLs, or decode encoded strings back to readable text.
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Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to text.
HTML Entities
Convert special characters to HTML entities and back.
ASCII / Char Code Viewer
Paste a string to see each character with its numeric code point underneath.
Aspect Ratio Calculator
Calculate aspect ratios from dimensions, or find a missing dimension from a ratio.