readme.now

Base64 Encoder

Encode UTF-8 text as standard Base64 or URL-safe Base64, with optional padding and multi-level conversion.

Base64 Encoder
Text Input
Base64 Output

Generating Secure Base64 Payloads

Encode plain text or binary strings into Base64 for safe transport over text-based protocols. Perfect for embedding images, handling Basic Auth headers, or preparing data for secure transmission.

✓100% Private Client-Side Execution
✓Supports URL-Safe Variants

Base64 represents bytes; it does not encrypt them

Text is converted to UTF-8 bytes and then represented with the Base64 alphabet. The result is convenient for transport through text systems, but anyone can decode it.

Example input

Hello, 世界

Expected output

SGVsbG8sIOS4lueVjA==

Behavior

  • Encodes Unicode text as UTF-8 before Base64 conversion.
  • Preserves padding characters when the byte length requires them.
  • Multiple levels encode the previous result again.

Limits and edge cases

  • Base64 increases size by roughly one third.
  • It provides no confidentiality, integrity, or authenticity.
  • Binary-file handling is separate from encoding text pasted into this tool.

Processing note: tool input stays in the browser. Readme.now analytics records page usage, not the payload you paste or the generated output.

Authoritative reference: RFC 4648: Base-N encodings

Related tools

Continue the workflow without copying data to a server.

Decode Base64Recover UTF-8 text from Base64.URL encodePercent-encode text for URL components.Inspect JWTsReview Base64url token segments.