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How to Decode Base64 and Decompress Zstandard Data

Step 1

Input Base64-Encoded Compressed Data

Start by entering your Base64-encoded Zstandard compressed data. This data was created using the Zstandard to Base64 converter:

•
Paste Base64 string: Copy the Base64-encoded compressed data and paste it into the input
•
Upload file: Click "Upload" to load a file containing Base64 data
•
Try samples: Click sample buttons to test with example compressed data

Example: Base64-Encoded Compressed Data

Sample Base64 string containing Zstandard compressed data:

KLUv/SBcjQIA0gQRF6ClOs/8Tynz98A4OacT7wbTIlikftV5BYJN13cUqE2HKIXvTBEpTQw1Zsp9PzQHi4DbZPhCYx2Uy9x3zT2KgbxNCAEDAD0FdMOqDbMM
Step 2

Click Decompress

Click the "Decompress" button to decode the Base64 and decompress the Zstandard data:

•
Base64 decoding: The tool first decodes the Base64 string to binary data
•
Zstandard decompression: Then decompresses the Zstandard data to restore original content
•
Instant results: Original data appears immediately in the output panel

Example: Decompression Process

How the two-step decompression works:

Step 1:Base64 string → Binary Zstandard data (using RFC 4648 decoding)
Step 2:Binary Zstandard → Original data (using RFC 8878 Zstd algorithm)
Result:Perfect restoration of original content - 100% lossless
Step 3

View Decompressed Data

Your original data is restored and displayed with statistics:

•
Original content: View the fully restored original data
•
Size comparison: See compressed vs decompressed sizes
•
Expansion ratio: View how much the data expanded during decompression

Example: Decompressed Original Data

The restored original JSON data:

{
  "user": "john_doe",
  "email": "[email protected]",
  "active": true,
  "preferences": {
    "theme": "dark",
    "notifications": true
  }
}
Step 4

Copy or Download

Use your decompressed data in your applications. The restored data can be used directly in JSON parsers, XML processors, or any text-based system:

•
Copy to clipboard: One-click copying for immediate use
•
Download as file: Save the decompressed data as a text file
•
Ready to use: Original data restored perfectly for your application

Example: Using Decompressed Data

Sample code to parse and use the decompressed data:

// JavaScript example
const decompressedData = `{
  "user": "john_doe",
  "email": "[email protected]",
  "active": true
}`;

// Parse JSON
const userData = JSON.parse(decompressedData);
console.log(userData.email); // [email protected]

// Use in your application
updateUserProfile(userData);

The decompressed data is identical to the original - ready to use immediately!

Frequently Asked Questions

What is Base64 to Zstandard decompression?

Base64 to Zstandard decompression is a two-step process: first, it decodes the Base64 string back to binary Zstandard compressed data, then decompresses that data using the Zstandard algorithm to restore the original content. This reverses the compression and encoding done by the Zstandard to Base64 tool.

How do I get Base64-encoded Zstandard data?

Base64-encoded Zstandard data is typically created by compressing data with Zstandard and then encoding it to Base64. You can create it using our Zstandard to Base64 tool, or receive it from APIs and databases that store compressed data in Base64 format.

Why is my data Base64-encoded after compression?

Compressed data is binary, which can't be safely transmitted through text-based systems like JSON APIs, HTTP headers, or text databases. Base64 encoding converts binary data to text-safe characters, making it perfect for APIs and web applications while maintaining the compression benefits.

Is the decompressed data exactly the same as the original?

For text, yes. Zstandard is lossless, so JSON, XML, CSV or logs come back exactly as they were compressed, long numbers and accented characters included. The result is shown and downloaded as UTF-8 text, though, so if the original was binary (an image or an archive) the bytes that aren't valid text show up as � and the page warns you. For binary payloads, decode the Base64 and run zstd -d locally.

What if I get a decompression error?

Decompression errors usually occur if the Base64 string is invalid, corrupted, or not actually Zstandard compressed data. Make sure you're using data that was compressed with Zstandard and properly encoded to Base64. Also check that the entire Base64 string was copied without truncation.

Can I decompress large files?

Up to 10 MB of compressed data, pasted or uploaded. The compression level used doesn't matter. Everything is sent to our server and the full result comes back to your browser, so multi-megabyte payloads take a few seconds; for anything bigger, zstd -d on your own machine is the better choice.

Is my data sent to a server?

Yes. Your browser cleans up the Base64 (line breaks, a data: prefix, URL-safe characters) and checks that it really is Zstandard, then sends it to our server, which decompresses it and sends the text back. Don't paste secrets you wouldn't want to leave your machine.

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