Base64 Decoder
Decode Base64 strings instantly into readable UTF-8 text. Copy decoded output, inspect size details and download decoded content directly from your browser.
Decode Base64
Convert Base64 strings into readable text
Base64 Input
Paste, type, upload or drop Base64 content
Decoded Output
Readable UTF-8 decoded text
Waiting
Ready to Decode
Enter Base64 content and click Decode Base64.
Input Size
0 B
Decoded Size
0 B
Characters
0 B
Size Change
0%
Browser-Based Base64 Decoding
This implementation decodes Base64 directly in your browser with JavaScript. Decoding, copying and file-size calculations do not require your Base64 content to be sent to a server.
Decoder Features
Decode Base64 in Seconds
Convert Base64 content into readable text with fast browser-based processing.
Instant Decoding
Decode valid Base64 strings into readable UTF-8 text.
UTF-8 Support
Display decoded Unicode and multilingual text correctly.
Input Validation
Detect malformed Base64 before generating decoded output.
Copy & Download
Copy decoded text or download decoded binary content.
Three Simple Steps
How to Decode Base64 Online
Enter Base64
Paste Base64 into the editor, upload a text file or drag and drop Base64 content.
Decode Base64
Click Decode Base64 to validate the input and remove unnecessary formatting.
Copy or Download
Review the decoded output, copy it to the clipboard or download the decoded content.
Base64 Decoding Guide
What Is a Base64 Decoder?
A Base64 Decoder reverses Base64 encoding by converting a Base64 text representation back into its original bytes. When those bytes represent UTF-8 text, the result can be displayed as readable text.
Base64 is widely used in APIs, email content, data URLs and developer workflows. Decoding helps inspect or restore content that was previously encoded.
Base64 Decoding Example
Base64 input:
SGVsbG8gV29ybGQ=Decoded text:
Hello WorldWhy Decode Base64?
Developers often decode Base64 to inspect API values, restore embedded content, troubleshoot integrations or recover text and binary data from a text-safe representation.
Decoding does not decrypt information. Base64 is reversible encoding and provides no confidentiality by itself.
How Does Base64 Decoding Work?
A decoder maps Base64 characters back into bytes. If the bytes contain UTF-8 text, they can be converted into readable Unicode characters. If they contain binary data, the bytes can be downloaded as a file.
This tool accepts standard Base64 and URL-safe Base64 characters, removes whitespace and can restore missing padding when the input length allows it.
Base64 Decoding vs Decryption
Base64 decoding is not cryptographic decryption. It simply reverses a public encoding format. Anyone can decode valid Base64 content without a secret key.
Decryption uses cryptographic algorithms and keys to recover protected information. Do not rely on Base64 to secure sensitive data.
Common Uses for Base64 Decoding
API Debugging
Inspect encoded values returned by APIs and integrations.
Data URLs
Recover content represented inside Base64-based data URLs.
Email Content
Decode Base64-encoded message parts and attachment data.
Developer Testing
Inspect encoded test strings and restore original byte content.
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Base64 Decoder FAQs
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Paste Base64 content and generate readable decoded output in seconds.
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