Detected: plain text → encode
File to Base64
Drag & drop an image or PDF to get a Base64 data URI
PNG, JPG, GIF, WebP, PDF supported
Input: 26 bytes → Output: 36 bytes (38% larger)
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The Base64 Decoder tokenizes and validates input against the relevant specification (RFC, W3C, or language standard). Syntax errors include line/column hints when the format supports positional parsing.
Input passes through a deterministic transform pipeline: normalize → validate → format/encode → output. The same input always produces identical output with no server round-trip.
Special characters, Unicode code points, and escape sequences are handled per the target format's rules. Output preserves semantic meaning while conforming to structural requirements.
Updated: July 2026
A backend developer pastes a malformed payload into the Base64 Decoder during an incident to locate syntax errors before redeploying.
Before opening a pull request, an engineer runs config files through the Base64 Decoder to enforce consistent formatting across the team.
A technical writer uses the Base64 Decoder to produce clean, readable examples for internal API documentation.
Use our free Base64 Decoder for fast, accurate results in your browser. No signup or installation required — works on any device.