Free Base64 Decoder Online - Decode Base64 Strings Instantly | Base64 Decoder Tool

Decode Base64-encoded strings instantly with our free online Base64 decoder. Supports URL-safe Base64, batch processing, and validation. No installation required.

How it Works?

Our Base64 decoder tool converts Base64-encoded strings back to their original text or binary data. Simply paste your Base64 string and get instant decoded results.
  • Setup
    Paste your Base64-encoded string
  • Decode
    Tool automatically decodes Base64 format
  • Validate
    Validates Base64 format before decoding
  • Copy
    Get decoded result and copy to clipboard

Base64 Decoder

Decoded Result:

What is Base64 Encoding?

Base64 is an encoding scheme that converts text and binary data into ASCII text format.
It's commonly used for:
  • Embedding images in HTML/CSS (data URIs)
  • Encoding email attachments
  • Storing binary data in JSON/XML
  • URL encoding (URL-safe variant)
  • API data transmission

Base64 uses 64 characters:
  • A-Z, a-z, 0-9, +, and / (with = for padding).
Our encoder supports both standard and URL-safe Base64:
  • Standard: Uses `+` and `/` characters
  • URL-safe: Uses `-` and `_` instead (no padding)
  • Perfect for URLs and filenames

URL-Safe Base64

Quick FAQ

  • Common Use Cases
    • Web Development: Decode Base64 data URIs
    • Email: Decode email attachments
    • APIs: Decode Base64 responses
    • Data Analysis: Extract text from Base64-encoded data
    • Security: Decode Base64 tokens and certificates
    • Image Processing: Decode Base64 image data
    1
  • Perfect for Developers
    This Base64 decoder is essential for developers working with:
    • JavaScript Base64 operations (atob, btoa)
    • API development and testing
    • Data processing and transformation
    • Web scraping and data extraction
    • Image and file handling
    2
  • Batch Processing
    Process multiple Base64 strings at once! Paste Base64 strings one per line and the decoder will process each string, returning all decoded results.

    Perfect for:
    • Processing lists of Base64-encoded data
    • Bulk decoding operations
    • Data analysis and extraction
    • Converting multiple encoded strings
    3
  • Validation
    The decoder validates Base64 format before decoding:
    • Checks for valid Base64 characters
    • Validates padding
    • Handles whitespace automatically
    • Shows error messages for invalid formats
    4
💡 Enhance Your URL Processing with Link Grabber!

Looking to extract and process links from websites? Our Base64 decoder pairs perfectly with Link Grabber Chrome extension - the professional tool for automated link extraction and site crawling.

Why use both tools together?
  • Decode Base64 data with our decoder
  • Extract links automatically using Link Grabber
  • Process large datasets efficiently
  • Handle data encoding in web scraping workflows
Need More Encoding Tools?
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