Free YAML to Base64 encoder — UTF-8-safe, ideal for Kubernetes Secrets

UTF-8-safe Base64, processed entirely in your browser — nothing is uploaded.

🔁 YAML to Base64 — Free Online Tool

Encode YAML to Base64 for Kubernetes Secrets, free. YAML to Base64 encoding converts a YAML config or value into the UTF-8-safe Base64 string (RFC 4648) that Kubernetes Secrets require under their data field. This tool validates the YAML and encodes it entirely in your browser, so secret values and config never leave your device.

🚀 Why use this YAML to Base64 tool?

It produces exactly the Base64 string a Kubernetes Secret expects under data:, encoding multi-line YAML byte-for-byte with full UTF-8 support. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.

Key Features

☸️Kubernetes-ready

Outputs the Base64 string to paste under a Secret's data field, the format kubectl expects.

📐Byte-exact multi-line

Indentation and block scalars are encoded exactly and restored on decode.

🌍UTF-8 safe

Non-ASCII values round-trip correctly.

🔒100% private

Config and secret values never leave your device.

Popular Use Cases

Kubernetes

  • • Encode a Secret data value
  • • Prepare a config for a Secret
  • • Hand-craft a manifest

Config transport

  • • Inline YAML in a field
  • • Env var payloads
  • • Avoid escaping issues

CI/CD

  • • Encode pipeline config
  • • Store a value safely for transport
  • • Templating inputs

What It Handles

Encodes

  • ✓ YAML → Base64
  • ✓ Multi-line
  • ✓ UTF-8 bytes

Output

  • ✓ Copy to clipboard
  • ✓ Secret data: format
  • ✓ Padded

Privacy

  • ✓ Client-side only
  • ✓ No network calls
  • ✓ Runs offline

Sources & References

Frequently Asked Questions

How do I encode YAML to Base64 for a Kubernetes Secret?

Paste your YAML and click Encode. Kubernetes stores Secret values under the data field as Base64, so a YAML config file or value must be Base64-encoded before you put it there. This tool validates the YAML and produces the UTF-8-safe Base64 string to paste under data:.

What is the difference between data and stringData in a Kubernetes Secret?

Values under data must be Base64-encoded — use this tool for those. Values under stringData are written as plain text and Kubernetes Base64-encodes them for you at apply time. If you use stringData you do not need to encode manually; data is the field that requires Base64.

Does encoding handle multi-line YAML correctly?

Yes. The whole document, including indentation and multi-line block scalars, is encoded byte-for-byte and restored exactly on decode. The encoder is UTF-8-safe, so non-ASCII values survive the round trip.

Is Base64 in a Secret the same as encryption?

No — and this is a common misconception. Kubernetes Secret data is only Base64-encoded, not encrypted; anyone with read access can decode it. Enable encryption at rest and RBAC for real protection. Base64 here is an encoding requirement, not a security control.

Is my YAML uploaded anywhere?

No. Validation and encoding run in your browser. Your config and secret values never leave your device.

🎓 Pro Tips

  • Tip 1: Prefer stringData in your Secret manifests when you can — Kubernetes encodes it for you, so you skip manual Base64.
  • Tip 2: A Kubernetes Secret is only Base64-encoded, not encrypted — enable encryption at rest and RBAC for real protection.
  • Tip 3: Encode each Secret value separately; the data field holds one Base64 string per key.