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Base64 Encoder/Decoder

Drop a file here to encode it to Base64

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About Base64 Encoder/Decoder

Base64 Encoder/Decoder converts text and binary data to and from Base64 encoding, the standard format used to embed data in URLs, emails, HTML, and API payloads. It supports both encoding plain text into Base64 strings and decoding Base64 back into its original form. Developers, system administrators, and security professionals rely on this tool for data transport, debugging, and integration tasks.

Key Features

  • Encodes plain text or binary data to Base64 with a single click
  • Decodes Base64 strings back to their original text representation
  • Supports UTF-8 encoding for international characters and special symbols
  • Handles URL-safe Base64 variants used in JWTs and data URIs
  • Provides instant output without sending data to any external server
  • Displays the encoded output length and ratio compared to the original input

How to Use Base64 Encoder/Decoder

  1. 1

    Choose your operation

    Select whether you want to encode (text to Base64) or decode (Base64 to text) using the mode toggle.

  2. 2

    Enter your input

    Paste the plain text you want to encode or the Base64 string you want to decode into the input area.

  3. 3

    Click Convert

    Press the Convert button to instantly transform your input into the desired format.

  4. 4

    Copy the result

    Use the copy button to grab the output and paste it into your code, email template, API request, or configuration file.

Common Use Cases

Embedding Images in HTML or CSS

Encode small images or icons into Base64 data URIs to inline them directly in HTML or CSS, reducing the number of HTTP requests your page needs.

API Authentication Headers

Encode credentials in the username:password format for HTTP Basic Authentication headers required by many REST APIs.

Email Attachment Debugging

Decode Base64-encoded email attachments or MIME parts to inspect their content when troubleshooting email delivery issues.

JWT Payload Inspection

Decode the Base64-encoded segments of JSON Web Tokens to examine claims and expiration times without a dedicated JWT library.

Why Use Our Base64 Encoder/Decoder

Encode or decode Base64 in one click without opening a terminal or writing throwaway scripts. This tool handles URL-safe variants and full UTF-8 support out of the box, which many simpler converters get wrong. Everything runs client-side so your credentials, tokens, and data URIs stay private on your machine.

Safe for API Keys and Credentials

Base64 encoding is commonly used for HTTP Basic Auth headers that contain usernames and passwords. This tool processes everything in your browser, so credentials and encoded secrets are never sent to a remote server. Your API keys, tokens, and authentication data stay on your device.

Frequently Asked Questions

Is Base64 encoding the same as encryption?
No. Base64 is an encoding scheme, not encryption. It transforms data into a different representation for safe transport, but anyone can decode it. Never use Base64 as a security measure for sensitive data.
Why does Base64 make my data larger?
Base64 represents every 3 bytes of input as 4 ASCII characters, resulting in roughly a 33% size increase. This trade-off allows binary data to be safely transmitted through text-based protocols like HTTP and SMTP.
Does this tool support file encoding?
This tool is designed for text-based Base64 encoding and decoding. For encoding entire files such as images or PDFs, you would typically use a command-line tool or a programming language library.

Last updated: April 6, 2026