Base64 Decode Online

Base64 Decode Online

Use our free Base64 Decode tool to convert Base64-encoded strings back into their original format — whether text, binary, image, or PDF. This tool supports decoding for developers working in JavaScript, Python, Java, PHP, and other languages.

Base64 Decode Capabilities

Use Case	Supported	Example Output
Text decoding	Yes	Hello World!
PDF decoding	Yes	Outputs binary PDF data (downloadable)
Image decoding	Yes	Reconstructs JPG/PNG from Base64 string
Programming support (PHP, JS, Python, etc.)	Yes	Ready-to-use in dev environments

What is Base64 Decoding?

Base64 decoding is the process of converting Base64-encoded data back into its original format. Base64 is commonly used to encode binary data (like images and files) into text for easy transmission over systems that handle only text (e.g., JSON, email).

Base64 Decode Example

Input (Base64):

SGVsbG8gV29ybGQh

Decoded Output:

Hello World!

Popular Developer Use Cases

• base64 decode online: Use this tool directly in your browser.
• javascript base64 decode: atob('SGVsbG8gV29ybGQh')
• php base64 decode: base64_decode('SGVsbG8gV29ybGQh')
• python base64 decode: base64.b64decode('SGVsbG8gV29ybGQh')
• java base64 decode: Base64.getDecoder().decode("SGVsbG8gV29ybGQh")
• base64 decode pdf/image: Simply paste the Base64 and download the decoded file.

How to Decode Base64 in Programming Languages

Language	Code Snippet
JavaScript	atob("SGVsbG8gV29ybGQh")
Python	import base64 base64.b64decode("SGVsbG8gV29ybGQh")
PHP	base64_decode("SGVsbG8gV29ybGQh");
Java	Base64.getDecoder().decode("SGVsbG8gV29ybGQh");
C#	Convert.FromBase64String("SGVsbG8gV29ybGQh");
Linux	echo SGVsbG8gV29ybGQh | base64 --decode

Frequently Asked Questions (FAQs)

Q1. How do I decode a Base64 string online?

Paste your Base64 string into our tool and click "Decode". You'll get the original content in readable or downloadable form.

Q2. Can I decode Base64 to a PDF or image?

Yes, if your input is a valid Base64-encoded file (like PDF, PNG, JPG), the tool will allow you to download the decoded file.

Q3. What is the difference between Base64 encode and decode?

Encoding converts binary/text to Base64 text. Decoding reverses that process to retrieve the original data.

Q4. How do I decode Base64 in JavaScript?

Use the built-in method: atob("base64string").

Q5. What is a common Base64 use case?

Embedding small images or fonts directly into HTML, CSS, or JavaScript files for web optimization.