Instantly translate Base64 encoded strings back into readable text or downloadable files.
Decode Base64 encoded strings back to plain text.
The Base64 Decoder takes any valid Base64 encoded string and translates it back into plain text, including handling Unicode characters correctly.
SGVsbG8gV29ybGQ=Hello WorldBase64 is an encoding scheme that represents binary data in an ASCII string format. It is commonly used to embed image data or send data over media that are designed to deal with textual data.
This means your input contains characters that are not allowed in Base64 (like spaces, punctuation, or special symbols not in the Base64 alphabet) or the string length is not padded correctly.
Runs instantly on your local device.
No files are ever stored or uploaded.
Works perfectly on any screen size.
Delivers professional-grade output.
Use it on Chrome, Safari, or Edge.
Unlimited usage with no hidden fees.
Get results in seconds with our streamlined, browser-native process.
Paste the obfuscated Base64 string or Data URI directly into the translation field.
Specify whether you expect the output to be human-readable text or a raw binary file.
The engine strips prefixes, calculates padding, and maps the ASCII characters back to their raw byte values.
Read the translated text directly in the console or download the reconstructed file to your local system.
Designed to save time, protect your privacy, and deliver professional-grade results every time.
Automatically detects MIME types and handles Data URI prefixes to prevent structural corruption during extraction.
Capable of rebuilding raw binary structures, allowing you to download decoded images, PDFs, or audio files directly.
Features robust error handling that attempts to resolve missing padding syntax or invalid characters in dirty strings.
Maintains absolute data sovereignty by executing the reverse-translation entirely within your machine's browser memory.
See how different professionals leverage this tool in their daily workflows.
Decode the payload section of JSON Web Tokens to rapidly verify user claims, expiration dates, and authorization scopes.
Safely unpack obfuscated strings found in suspicious scripts or log files to understand malicious payload intentions.
Extract and rebuild documents or images that were stored directly as Base64 strings inside legacy SQL database columns.
Reverse Basic Auth headers from network requests to verify that client applications are transmitting the correct credentials.
Why thousands choose our platform over traditional software.
Everything you need to know about this tool.
The parser initially attempts to decode the string using UTF-8 mapping. If it encounters raw byte structures that fall outside printable text ranges, it provides the option to output and download the raw binary file instead.
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