Encode to Base64 Online

When to Encode Data as Base64

Base64 encoding converts binary or arbitrary text data into a safe ASCII subset so it can be transmitted through text-only channels. Common reasons to encode: creating Kubernetes secrets (stored as Base64 in YAML manifests), generating Basic Authentication headers (base64(username:password)), embedding images as data URIs in HTML and CSS, and passing binary data in JSON fields.

Our encoder converts your input text to standard Base64 (RFC 4648) or URL-safe Base64 (used in JWTs, where +// are replaced with -/_). All processing happens in your browser — safe for passwords, API keys, and other sensitive values you need to encode.

For Kubernetes, remember: kubectl create secret handles encoding automatically. Manual Base64 encoding in secrets.yaml is a common source of errors — a trailing newline in the encoded value breaks secret decoding. Our encoder strips trailing newlines by default.

Tips

• For Kubernetes secrets, use stringData instead of data in your YAML — it accepts raw strings and handles encoding automatically.
• Basic Auth header: Authorization: Basic base64("username:password") — the colon is part of the encoded string.
• Base64 output is always 4/3 × the input size (plus padding). A 12-byte secret becomes a 16-character Base64 string.
• Base64 is encoding, not encryption — anyone who sees the encoded value can decode it. Never use it for security.