Encoding & Conversion Calculators

Calculate base64 encode decode tool, binary converter and hex converter and other encoding & conversion calculations.

Popular:Base64 Encode Decode ToolBinary ConverterHex ConverterHTML Entity EncoderJSON FormatterURL Encode Decode Tool

All Encoding & Conversion Calculators

Base64 Encode Decode ToolEncode text to Base64, or decode Base64 back to plain text.Binary ConverterConvert a number between binary and decimal, in either direction.Hex ConverterConvert a number between hexadecimal and decimal, in either direction.HTML Entity EncoderEncode special characters (&, <, >, ", ') into HTML entities, or decode HTML entities back to plain text.JSON FormatterPretty-print and validate JSON text with your chosen indentation.URL Encode Decode ToolPercent-encode text for safe use in a URL, or decode percent-encoded text back to plain text.

Encoding & Conversion Guides

Technology & Internet2 min read

Base64 Encoding Explained: What It Does and What It Doesn't

Base64 converts arbitrary binary data into a text-safe string using a 64-character alphabet — it's a format conversion for safe transport through text-only channels, not encryption or compression, and it makes data larger, not smaller, by roughly a third.

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Technology & Internet2 min read

HTML Entity Encoding Explained: Why < and & Need Escaping

HTML entity encoding replaces characters that have special meaning in HTML markup — like < , > , and & — with a named or numeric escape sequence, so that literal text containing those characters displays correctly instead of being misinterpreted as the start of a tag or entity.

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Technology & Internet2 min read

URL Encoding Explained: Why Spaces Become %20

URL (percent) encoding replaces characters that have special meaning in a URL — or aren't allowed in one at all — with a percent sign followed by their hexadecimal byte value, so data like a space, an ampersand, or a question mark can be safely included inside a URL without being misread as part of the URL's own structure.

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