Free tool
Encode text strings and data into Base64 format or decode Base64 strings back to plain text locally in your browser.
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Base64 is a binary-to-text encoding scheme that translates binary data and arbitrary character strings into a sequence of 64 ASCII printable characters (A-Z, a-z, 0-9, +, and /). It is widely utilized in e-commerce systems to transmit credentials, small image icons, and structured state payloads safely across protocols (like HTTP and SMTP) without data corruption.
E-commerce developers encounter Base64 daily: HTTP Basic Authentication headers (e.g., Authorization: Basic [encoded_api_key:secret]), embedding inline SVG icons directly in theme stylesheets via data URIs, and passing encoded state parameters in OAuth payment handoffs.
A critical security principle is recognizing that Base64 is purely a data representation format, not an encryption algorithm. Anyone with access to a Base64 string can instantly decode it with zero keys or passwords. Never store or transmit raw customer passwords, credit card numbers, or sensitive PII in Base64 without strong underlying cryptography.
No. Base64 is an encoding mechanism, not encryption. It provides zero confidentiality or cryptographic protection and can be decoded instantly by anyone. Sensitive data must always be encrypted with algorithms like AES-256 or hashed with bcrypt.
Base64 represents every 3 bytes of binary data as 4 printable ASCII characters, resulting in an unavoidable ~33% overhead increase in data transfer size.
The equals sign (= or ==) represents padding bytes added to ensure the total encoded character length is divisible by 4, satisfying the 24-bit block structure mandated by RFC 4648.
Standard JavaScript btoa() natively handles Latin1 characters. To encode multi-byte Unicode (such as emojis or accented characters), the string must first be converted to UTF-8 byte arrays before encoding to prevent exceptions.
Percent-encode query parameters, special characters, and tracking strings into valid RFC 3986 URI formats.
Decode percent-encoded URLs, query string parameters, and tracking strings into clean human-readable text.
Format, indent, prettify, and inspect raw JSON payloads, API responses, and Schema.org structured data locally in your browser.
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