Base64 encode and decode online for API payloads, data URLs, and config files. Paste plain text to encode or paste Base64 to decode—works on your device for quick developer and support tasks.

Base64 is encoding, not encryption—anyone can decode it. Never hide secrets with Base64 alone.

UTF-8 text needs proper encoding before Base64—this tool handles typical Unicode strings in the browser.

How to use this tool

Paste input text, choose encode or decode, and copy the output. Switch direction without leaving the page.

Worked example

Example: decode `SGVsbG8gV29ybGQ=` to `Hello World` when debugging a JWT header or API response field.

When to use this

Debugging API responses with Base64 fields.
Building data URLs for small inline assets.
Teaching encoding in workshops.

Common examples

UTF-8 email header value → Base64 for debugging MIME parts.
Small JSON claim → Base64 segment inspection before JWT assembly.
Data URL prefix stripped → decode image bytes from `data:image/png;base64,...` payloads.
Small SVG icon → data URL for inline HTML email test.
UTF-8 string with emoji → Base64 for API fixture matching production encoding.

What people search for

base64 encode decode
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Common mistakes

Confusing Base64 with encryption.
Decoding binary data as UTF-8 text and getting mojibake.
Forgetting URL-safe Base64 variants use different alphabet.

base64 image to data uri
url safe base64 encode
base64 decode jwt payload

How it works

Choose Encode or Decode, then paste or type text. Encoding converts UTF-8 text to standard Base64. Decoding accepts standard or URL-safe Base64 (with optional whitespace) and returns the original text. All processing runs on your device.

Limitations

Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.

Privacy and file handling

Your data stays on your device and is not uploaded.

Related Base64 Encoder & Decoder guides

These pages use the same base64 encoder & decoder with guides tailored to specific search intents.

Base64 Encoder & Decoder — general payment estimate
Base64 Decoder Online
Image to Base64 Converter
Base64 to Text Decoder
File Base64 Encoder
Text to Base64 Converter
Base64 Encode Decode Tool
Base64 String Encoder

FAQ

Frequently asked questions

Is Base64 encryption?

No. It is reversible encoding for binary-safe text transport.

Are inputs logged?

Standard Utilnivo encode/decode runs locally without sending text to a server.

Padding characters?

Base64 output may end with = padding. Some APIs require or forbid padding—trim if needed.

Page last reviewed: July 6, 2026

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