Base64 Encode Decode Online
Free Base64 encoder decoder for text, JSON, URLs, HTML, and Unicode strings. Encode data to Base64 or decode Base64 back to readable text with secure, 100% client-side processing.
Base64 Encoder Decoder: Supported Use Cases
Use this Base64 encode decode online tool when you need a quick, browser-based converter for developer workflows. It supports common long-tail needs such as base64 encode string, decode base64 to text, and encode JSON to Base64.
| Task | Input Example | Why It Helps |
|---|---|---|
| Encode Text to Base64 | Hello World | Create a transport-safe string for APIs, scripts, or config values. |
| Decode Base64 to Text | SGVsbG8gV29ybGQ= | Inspect encoded payloads from logs, tokens, data exports, or headers. |
| Encode JSON to Base64 | {"status":"active"} | Prepare JSON strings for systems that expect Base64 encoded values. |
| Unicode Base64 Decode | 5L2g5aW9 | Decode UTF-8 content, including Chinese text and emoji, without corruption. |
Base64 Encode Decode Examples
Try these common Base64 conversion examples for strings, JSON payloads, and Unicode text.
Example 1: Base64 Encode String
Convert plain text into a Base64 encoded string for quick transport or storage.
Hello from JSONEscapeSGVsbG8gZnJvbSBKU09ORXNjYXBlExample 2: Decode Base64 to Text
Decode Base64 from logs or API responses back into readable JSON text.
eyJzdGF0dXMiOiJhY3RpdmUiLCJyb2xlIjoiYWRtaW4ifQ=={"status":"active","role":"admin"}Example 3: Unicode Base64 Encoder
Encode Unicode text safely without breaking Chinese characters or emoji.
Hello, UTF-8 safe textSGVsbG8sIFVURi04IHNhZmUgdGV4dA==Frequently Asked Questions
What is a Base64 encode decode tool?
A Base64 encode decode tool converts plain text, JSON, URLs, HTML, or other strings into Base64 and decodes Base64 back to readable text. Developers often use Base64 for API payloads, Basic Auth values, data URLs, email content, and configuration files.
Is Base64 encryption or encoding?
Base64 is encoding, not secure encryption. The phrase Base64 encrypt decrypt is a common search term, but Base64 does not protect secrets because anyone can decode it without a password. Use real encryption for sensitive data.
Can I encode JSON to Base64 online?
Yes. Paste JSON into the input, keep the tool in Encode mode, and it will convert the full JSON text into a Base64 string. Switch to Decode or click Swap to verify the original JSON comes back correctly.
Does this Base64 decoder support Unicode and Chinese text?
Yes. This Base64 encoder decoder uses UTF-8 safe conversion, so Unicode text, Chinese characters, emojis, URLs, HTML snippets, and JSON strings can be encoded and decoded without mojibake.