Base64 Tools

Base64 Decoder

Inspect decoded bytes safely in the browser and use Base64 to File when the payload is binary rather than valid UTF-8 text.

Encoded inputWaiting

Decoded UTF-8 text0 characters

—Decoded bytes

—Canonical padding

—Whitespace input

—Decoded characters

ReadyPaste Base64 and decode locally.

Trust and standards boundaries

Formatting is not schema validation, Base64 is not encryption, URL normalization is not a privacy guarantee, UUID metadata is not provenance, and decoded JWT claims are not trusted until cryptographic and application-specific validation succeeds. RS256 tools accept explicit PEM key formats and do not fetch issuer keys or make authorization decisions.

How to use this Base64 Decoder

Paste Base64, leave auto-detect enabled for standard/Base64URL input, and review validation errors before using the decoded UTF-8 text.