Which variant should I use for an email attachment?

Select Standard with 76-char (MIME) line wrapping. This is the format required by RFC 2045 for MIME email parts.

Is Base64 encryption?

No. Base64 is an encoding, not encryption. Anyone can decode a Base64 string without a key. Use AES or RSA to actually protect data.

Flowfiles ← Base64 Encoder / Decoder

Base64 Encoder Online

Encode text to Base64 — Standard, URL-safe, MIME, PEM — free and 100% local

This Base64 encoder instantly converts any UTF-8 or Latin-1 text into Base64. Choose the variant that fits your use case: Standard for REST APIs, URL-safe for JWT and OAuth, MIME (76 chars/line) for email, PEM (64 chars/line) for SSL certificates and SSH keys.

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Variant Line wrap Charset Padding (=)

Input

Base64

Base64 encoding use cases

Base64 encoding is essential in many web contexts:

JWT tokens: header and payload encoded in Base64URL (URL-safe, no padding).
MIME email: binary attachments encoded in Base64 with 76-char line wrapping.
PEM certificates: SSL/TLS keys and SSH keys encoded with 64-char line wrapping.
Data URIs: images embedded in HTML as data:image/png;base64,….
Kubernetes secrets: values in Secret objects are standard Base64.
HTTP Basic Auth: credentials user:password encoded in the Authorization header.

Frequently Asked Questions

How do I encode text to Base64?

Type or paste your text in the Input field with Encode mode selected. The Base64 output updates in real time. Click Copy to copy the result.

Which variant should I use for JWT?

Select URL-safe and uncheck Padding. JWT tokens use Base64URL (RFC 4648 §5): + → -, / → _, no trailing =.

Which variant for a PEM certificate?

Select Standard, PEM line wrap (64 chars), padding enabled. Then add the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- headers manually.

Does Base64 protect my data?

No. Base64 is reversible encoding, not encryption. Anyone who receives a Base64 string can decode it without a key. Use AES, RSA, or another algorithm to actually protect data.

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