How do I decode Base64?

Paste your Base64 string into the decoder and click Decode. The tool converts Base64 characters back to the original binary or text. Valid Base64 strings only contain A-Z, a-z, 0-9, +, /, and = for padding.

What can Base64 represent?

Base64 can represent any binary data: text, images, files, PDFs, audio, or executable code. Email attachments use Base64. Images embedded in HTML/CSS use Base64. API responses often use Base64 for binary data.

What if decoding shows gibberish?

If decoded output looks wrong: the input might not be Base64, the original data might be binary (not text), or you might need a specific charset. Try different charsets like UTF-8 or Latin-1. Binary files won't show readable text.

Base64 Decoder - Decode Base64 to Text

Base64 Input

Decoded Text

What is Base64 Decode?

Base64 decoding converts Base64-encoded data back to its original text or binary format. Base64 encoding reversibly transforms data into ASCII characters, and decoding reverses this process. This is essential for extracting original content from encoded email attachments, data embedded in URLs, API responses, and configuration files that use Base64 for compatibility.

How to Use

Paste your Base64-encoded string in the input field.
Click 'Decode' to convert it back to the original text.
The decoded result appears in the output field.
Click 'Copy' to copy the decoded text to your clipboard.
Use 'Load Sample' to see how decoding works with example data.
If input is invalid, an error message will appear explaining the issue.

Why Use This Tool?

Instantly decode Base64 strings to their original content

Support for UTF-8 encoded text with proper character handling

Clear error messages for invalid or malformed Base64 input

One-click copy for quick integration into your workflow

Works entirely in browser - no server processing required

Essential for debugging API responses and encoded data

Tips & Best Practices

Valid Base64 contains only A-Z, a-z, 0-9, +, /, and = (padding)
Padding characters (=) at the end ensure correct byte alignment
URL-safe Base64 may use - and _ instead of + and /
Invalid Base64 will result in error - check for typos or incomplete strings
Base64 strings should have length divisible by 4 (including padding)
Use our Base64 Encode tool to reverse this process

Frequently Asked Questions

What if my Base64 string has different characters?

Standard Base64 uses + and /. URL-safe Base64 uses - and _. Some variants omit padding (=). Our decoder handles standard Base64. For URL-safe variants, you may need to replace - with + and _ with / before decoding. Some systems use different character sets entirely.

Why does my decoded output look strange?

If decoded text appears garbled, the original data might be: binary data (not text), compressed data requiring decompression, encrypted data requiring decryption, or encoded with a different encoding (not UTF-8). Binary data may appear as control characters or gibberish when viewed as text.

Can I decode images or files?

Yes, but the decoded result will be binary data, not human-readable text. For images encoded in Base64 data URIs (data:image/png;base64,...), extract the Base64 part after the comma and decode it. Save the result as a file with the appropriate extension.

What is Base64 padding?

Padding (=) characters at the end of Base64 strings ensure the encoded data has correct byte alignment. Base64 encodes 3 bytes into 4 characters. Input not divisible by 3 gets padding. Strings ending with = or == are padded. Some systems omit padding.

How do I know if a string is Base64?

Base64 strings contain only specific characters: A-Z, a-z, 0-9, +, /, and = (padding). They typically have length divisible by 4. However, many things look like Base64 (hex, random strings). Try decoding - if it produces meaningful output, it was likely Base64.

Why use Base64 at all?

Base64 enables binary data transmission through text-only systems: email (MIME attachments), URLs, JSON/XML APIs, configuration files, and protocols designed for text. Without Base64, binary data would corrupt or require complex escaping in these contexts.

Base64 Decode