Developer Utility

Base64 Encoder / Decoder

Encode plain text into Base64 or decode Base64 data back into readable text. Supports UTF-8 text, URL-safe conversion, auto conversion, result copy, and TXT download.

UTF-8 Safe Conversion Safely converts Korean, emoji, special characters, and multilingual text to and from Base64.

URL Safe Option Convert Base64 into a URL-friendly Base64URL format for URLs, JWTs, and query strings.

Copy and Download Copy the converted result instantly or save it as a TXT file for API testing and documentation.

Base64 Converter

Select a conversion mode, enter your input, and check the result instantly.

Standard Base64 Convert text, JSON, configuration values, and other strings into an alphanumeric Base64 format.

Base64URL Replace +, /, and = characters with a URL-friendly format.

Auto convert while typing Use URL Safe Base64 Remove line breaks from result

Input 0 chars Input 0 bytes Output 0 chars Waiting for conversion

Input

Output Ready

Base64 Use Cases

Base64 is commonly used when data needs to be safely transferred or inspected in text-based environments.

API Testing

Used frequently in development testing, such as Basic Auth, JSON payloads, and simple encoded values.

URL and Token Data

Some parts of JWTs or URL-contained data are often represented in Base64URL format.

String Transfer

Useful for passing values containing special characters as safe ASCII text.

Help

What is a Base64 Encoder / Decoder?

A Base64 Encoder / Decoder is a developer utility that converts plain text into Base64 strings or restores Base64 strings back to the original text.

It can be used for API testing, checking authentication headers, analyzing token structures, and converting strings before data transfer.

How to Use

Select Encode or Decode mode.
Enter plain text or a Base64 string in the input area.
If auto conversion is enabled, the result appears as you type.
Use Copy Result or Download TXT when needed.

Is Base64 encryption?

No. Base64 is encoding, not encryption. Anyone can decode it, so it should not be used to protect passwords or secret keys.

What is URL Safe Base64?

URL Safe Base64 replaces + with -, / with _, and may omit the padding character =. It is safer to use in URLs, JWTs, and filenames.

Why does decoding fail?

Decoding may fail if the input contains non-Base64 characters, has broken padding, or does not match the selected standard/Base64URL format. Try changing the URL Safe option and checking the input.

Can it convert Korean or emoji?

Yes. This tool is built around UTF-8 conversion, so Korean, emoji, and special characters can be processed.

Can I enter sensitive tokens?

Even though this utility runs in the browser, it is safer not to enter real API keys, passwords, session tokens, or personal information. Mask sensitive values before testing.