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Base64 Decode Online

Decode Base64 encoded strings to plain text or encode text to Base64 instantly in your browser. Free, private, no server required.

Free Online Base64 Decoder & Encoder

Paste your Base64 encoded string and click Decode to get the original text, or enter plain text and click Encode to convert to Base64. Everything runs in your browser with no data sent to any server.

How to Decode Base64

  1. Paste your Base64 encoded string in the input area
  2. Click the Decode button to convert to plain text
  3. Or enter plain text and click Encode for Base64 output
  4. Click Copy to use the result

Features

  • Decode Base64 to UTF-8 text with full Unicode support
  • Encode any text to Base64 format
  • Handles multi-byte characters (emoji, CJK, etc.) correctly
  • URL-safe Base64 variant detection and handling
  • All processing happens locally in your browser

Frequently Asked Questions

What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 ASCII characters (A-Z, a-z, 0-9, +, /). It is commonly used for embedding data in URLs, emails, HTML, and API tokens like JWTs.
How does Base64 decoding work?
Base64 decoding reverses the encoding process: each group of 4 Base64 characters is converted back to 3 bytes of binary data, which is then interpreted as text using the specified character encoding (typically UTF-8).
Can Base64 decode binary files?
This tool focuses on decoding Base64 to text. For binary files (images, PDFs), you would need a tool that can save the decoded bytes directly to a file. Our Base64 tool handles text decoding with full Unicode support.
Is my data sent to a server?
No. All encoding and decoding happens entirely in your browser using the built-in btoa() and atob() functions. Your data never leaves your device.
What is URL-safe Base64?
URL-safe Base64 replaces + with - and / with _ to avoid issues in URLs. This tool automatically detects URL-safe Base64 and converts it before decoding.

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