Base64 Encoder & Decoder – Encode and Decode Base64 Online

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Base64 Encoder & Decoder

Encode text into Base64 or decode Base64 values back into readable text using one simple browser-based tool.

Free Online Tool UTF-8 Support URL-Safe Base64 Browser Based

Text to Encode

URL-safe Base64 Remove padding

Base64 Result

Input Characters 0

Output Characters 0

Base64 to Decode

Decoded Text

Input Characters 0

Output Characters 0

What Is a Base64 Encoder and Decoder?

Base64 is a method for representing binary data as text using a 64-character alphabet. It is commonly used when data needs to move through systems that are designed primarily to handle text.

The encoder converts text into Base64, while the decoder performs the reverse process and converts a valid Base64 value back into its original text when the encoded data represents text.

Base64 is encoding, not encryption. It does not provide confidentiality or password protection.

How to Use the Base64 Encoder

1. Select the Encode tab.
2. Enter or paste the text you want to convert.
3. Select URL-safe Base64 if required by your application.
4. Select Remove padding only when an unpadded Base64 value is needed.
5. Click Encode to Base64.
6. Copy or download the resulting Base64 value.

How to Use the Base64 Decoder

1. Select the Decode tab.
2. Paste a valid Base64 value into the input field.
3. Click Decode Base64.
4. Review the decoded text.
5. Copy or download the decoded result if needed.

Base64 Encoding Example

Original text Hello World
Base64 SGVsbG8gV29ybGQ=

Decoding SGVsbG8gV29ybGQ= produces the original text, Hello World.

How Base64 Encoding Works

Base64 represents data using four characters for every complete group of three input bytes. Each Base64 character represents six bits, allowing 24 bits from three bytes to be represented as four groups of six bits.

Standard Base64

Standard Base64 uses uppercase letters, lowercase letters, numbers, plus and slash characters. Equals signs may be used as padding at the end of the encoded value.

URL-Safe Base64

URL-safe Base64 replaces the plus character with a hyphen and the slash character with an underscore. This makes the encoded value more suitable for URLs and similar contexts.

UTF-8 and Unicode

When text contains Unicode characters, this tool represents the text as UTF-8 bytes before performing Base64 encoding. The decoder converts the resulting bytes back into text.

Common Uses of Base64

API Development

Developers can use Base64 to represent binary information within text-based API data.

Web Development

Base64 can be used in data URLs and other web-development situations where binary content needs a text representation.

Testing & Debugging

Encode and decode sample values while testing applications, APIs and data-processing workflows.

Common Base64 Mistakes

• Treating Base64 as encryption or a security mechanism.
• Using standard Base64 when URL-safe Base64 is required.
• Removing padding when the receiving system expects standard padded Base64.
• Trying to decode an incomplete or corrupted Base64 value.
• Assuming Base64 makes data smaller. Base64 normally increases the size of encoded data.
• Assuming every Base64 value represents readable text. Base64 can also represent arbitrary binary data.

Base64 Encoding vs Encryption

Base64 only changes the representation of data. Anyone with a Base64 decoder can reverse the encoding.

Encryption is designed to protect information using cryptographic algorithms and keys. Do not use Base64 as a substitute for encryption when confidential information needs protection.

Frequently Asked Questions

What is Base64 encoding?

Base64 encoding converts binary data into a text representation using a 64-character alphabet.

What does a Base64 decoder do?

A Base64 decoder reverses a valid Base64 representation and reconstructs the original bytes. When those bytes represent text, the original text can be displayed.

Is Base64 encryption?

No. Base64 is an encoding format and does not provide encryption or confidentiality.

Can Base64 encode Unicode text?

Yes. Unicode text can be represented as UTF-8 bytes and then encoded into Base64.

What is URL-safe Base64?

URL-safe Base64 uses hyphens and underscores instead of the plus and slash characters used by standard Base64.

Why does Base64 sometimes end with equals signs?

Equals signs are padding characters used by standard Base64 when the input length does not fill a complete group of three bytes.

Does Base64 reduce file size?

No. Base64 normally increases the amount of text required to represent the original data.

Related Tools

Base64 Encoder Encode text into Base64 format. Base64 Decoder Decode Base64 values into text. ASCII Converter Convert between ASCII representations. ASCII Text Converter Work with ASCII text conversions. Encoding & Decoding Tools Explore related encoding and decoding utilities. Developer & Web Utilities Explore more developer and web utilities.

Encode or Decode Base64 Online

Convert text to Base64 or decode Base64 values quickly with this free browser-based utility.

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