Free Online Base64 Encoders
Encode and decode JSON, XML, and YAML to and from Base64 instantly. All 6 tools run client-side — your data stays private.
What Is Base64 Encoding?
Base64 is an encoding scheme that converts binary or text data into a string of ASCII characters using a 64-character alphabet (A–Z, a–z, 0–9, +, /). This makes it safe to transmit data through text-based systems like HTTP headers, JSON fields, email attachments, and data URIs.
Our Base64 tools specifically encode and decode structured data formats — JSON, XML, and YAML — making it easy to embed or extract structured payloads in Base64-encoded fields.
Common Use Cases
- check_circleEncode a JSON payload for embedding in an HTTP Authorization header
- check_circleDecode a Base64-encoded API response to inspect its JSON content
- check_circleEncode XML data for transmission in a text-only channel
- check_circleDecode Base64 YAML config from an environment variable
- check_circleEmbed JSON data as a Base64 data URI in a web application
- check_circleStore structured configuration in Base64 in Kubernetes secrets
Frequently Asked Questions
Is Base64 the same as encryption?
No. Base64 is an encoding scheme, not encryption. Encoded data can be decoded by anyone without a key. Do not use Base64 to secure sensitive data — use proper encryption for that.
Why does Base64 increase data size?
Base64 encodes every 3 bytes of data into 4 ASCII characters, resulting in approximately 33% larger output. This overhead is acceptable for small payloads like tokens or config values.
What is a Base64 data URI?
A data URI embeds file content directly in a URL using Base64 encoding — for example, data:image/png;base64,.... This lets you inline images or other assets directly in HTML or CSS without a separate HTTP request.
Why is JSON or YAML Base64-encoded in Kubernetes?
Kubernetes Secrets store sensitive values as Base64-encoded strings to safely represent binary data or strings with special characters in YAML manifests. Note that this provides encoding, not security.
Developer Insights
From the Blog
Base64 Encoding: A Complete Technical Reference
Everything about Base64 — from encoding theory to real-world use in data URIs, JWT tokens, and binary transfer.
The Case for 100% Client-Side Data Processing
Why we built OpenFormatter to process all data locally, and what that means for your workflow security.
Why JSON Formatting Matters More Than You Think
How proper JSON structure prevents production bugs, improves debugging, and makes code reviews faster.