Base64 Decode Online converts valid standard Base64 into UTF-8 text. Use it for encoded API fields, configuration values, email or data examples, and other text payloads that need inspection.

An error can mean the value is truncated, contains whitespace or invalid characters, uses Base64url, omits required padding, or represents binary data instead of UTF-8 text. Base64 is reversible encoding, not encryption.

How to use this tool

How to decode standard Base64 text

01

Paste standard Base64 that represents UTF-8 text.

02

Select Decode Base64; this page keeps the workspace in Decode mode.

03

If validation fails, check the alphabet, padding, and whether the source is Base64url.

04

Review the decoded text before using it in an application or configuration file.

Before and after example

Base64 to UTF-8 text example

Input

U2NyaXB0WmlwIGRldmVsb3BlciB0b29scw==

Output

ScriptZip developer tools

Options, errors, and limitations

Base64 alphabet, padding, and decoding errors

Main Tool

Use Base64 Encoder and Decoder

Encode text to Base64 or decode Base64 strings into readable output for development workflows.

Parent category

Explore the Converter Tools hub

Converters for JSON, CSV, XML, Base64, and URL-encoded content.

Practical guides

Troubleshoot and choose the next step

FAQ

Base64 decoding questions

What does Base64 decoding do?

It reverses standard Base64 into the original bytes. This page displays the result only when those bytes form valid UTF-8 text.

Why does Base64 decoding fail?

Check for invalid characters, whitespace, missing padding, truncated input, Base64url characters, or decoded bytes that are not valid UTF-8 text.

Can decoded Base64 contain plain text?

Yes, when the original bytes represent text and use UTF-8. Binary files can also be Base64 encoded, but this page is a text decoder.

Is decoded Base64 trusted or safe?

No. Decoding changes representation only. Validate and escape untrusted output for the application context where it will be used.

Is Base64 encryption?

No. Base64 provides no secrecy or authenticity and should never be used to protect credentials or other secrets.

Minify Tools

Formatter Tools

Converter Tools

Validator Tools

Text Tools

Security Tools

Base64 Decode Online

Decode Base64 into UTF-8 Text

How to decode standard Base64 text

Base64 to UTF-8 text example

Input

Output

Base64 alphabet, padding, and decoding errors

Use Base64 Encoder and Decoder

Explore the Converter Tools hub

Troubleshoot and choose the next step

Base64 decoding questions

Base64 Decode Online

Decode Base64 into UTF-8 Text

Switch between encode and decode on the combined page.

Use focused encode-only and decode-only pages when one action is required.

Get a clear error for invalid Base64 or non-UTF-8 decoded bytes.

Open URL Encoder or JWT Decoder for different alphabets and transport formats.

How to decode standard Base64 text

Base64 to UTF-8 text example

Input

Output

Base64 alphabet, padding, and decoding errors

Standard Base64 encoding of UTF-8 text

Strict standard Base64 decoding into UTF-8 text

Validation for invalid characters, padding, and decoded text

Base64 is encoding, not encryption; anyone with the value can decode it without a key.

JWT segments use Base64url rules, so inspect them with JWT Decoder instead of assuming standard Base64.

Base64 increases byte size by roughly one third and this page decodes only content that becomes valid UTF-8 text.

Use Base64 Encoder and Decoder

Base64 Encoder and Decoder

More Base64 Encode and Decode workflows

Encode Base64 Online

Helpful Converter Tools

JWT Decoder

URL Encoder and Decoder

JSON to CSV

Base64 Encoder and Decoder

CSV to JSON

Explore the Converter Tools hub

Converter Tools

All Online Developer Tools

Troubleshoot and choose the next step

Fix Common JSON Parse Errors

Base64 vs Base64URL

Base64 decoding questions