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How to Decompress Zstandard Data - Step by Step Guide

Step 1

Paste Compressed Data

Start by pasting your Zstandard compressed data (Base64-encoded) into the input area. The tool accepts compressed data from network monitoring, telecom systems, or any Zstd-compressed source.

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Paste compressed data: Copy your Base64-encoded Zstandard data directly into the editor
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Upload a file: Load compressed data from a .txt or .zst file
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Try samples: Click sample buttons to see different sizes (small, medium, large compressed data)

Example: Base64 Zstandard Compressed Data

This is the Small Sample. Every Zstandard frame starts with the bytes 28 B5 2F FD, which is why the Base64 begins with KLUv/:

KLUv/SBcjQIA0gQRF6ClOs/8Tynz98A4OacT7wbTIlikftV5BYJN13cUqE2HKIXvTBEpTQw1Zsp9PzQHi4DbZPhCYx2Uy9x3zT2KgbxNCAEDAD0FdMOqDbMM
Step 2

Click Decompress Button

Click the blue "Decompress" button to send your Zstandard data to our C# backend API for decompression. The tool uses ZstdSharp to restore your data to its original format with fast decompression speed.

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Fast decompression: Zstandard decompresses 3-4x faster than gzip
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Lossless: Original data is perfectly restored without any loss
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RFC 8878 compliant: Industry standard Zstandard decompression
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Statistics: View compressed size, decompressed size, and expansion ratio

Example: Decompressed Output

What the Small Sample above turns back into (92 bytes from 90 compressed, since tiny inputs barely shrink):

{
  "operator": "GlobalTel",
  "network": "5G",
  "subscribers": 2500000,
  "active": true
}
Step 3

Copy or Download Result

Copy the decompressed data to your clipboard or download it as a text file for use in your applications, analysis tools, or data processing pipelines.

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Copy to clipboard for immediate use in your application
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Download as .txt file for storage or further processing
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View statistics: Check expansion ratio and size information

What is Zstandard Decompression?

Zstandard (Zstd) decompression is the process of restoring compressed data back to its original form. Developed by Facebook, Zstandard offers exceptionally fast decompression speeds while maintaining excellent compression ratios, making it ideal for real-time data processing.

Zstandard decompression is essential for network monitoring, telecom data processing, database exports, and any scenario where quick access to compressed data is needed. You can also use our Zstandard Compressor to compress your data.

Frequently Asked Questions

What format does the decompressor accept?

Base64 text of a Zstandard frame, the kind of string you find in a JSON field, a log line or an API response. Line breaks, a data:...;base64, prefix and URL-safe Base64 (- and _) are all fine. If you have a raw .zst file, upload it and the page turns it into Base64 for you.

Is Zstandard decompression faster than gzip?

Usually, yes. Zstandard was built to decompress quickly, and in most benchmarks it beats gzip by a wide margin at similar compression ratios. For small payloads like the samples here, the network round trip takes far longer than the decompression itself.

Is there a size limit?

Yes, 10 MB of compressed data, pasted or uploaded. The whole result comes back to your browser as text, so multi-megabyte outputs take a few seconds to show. For anything bigger, run zstd -d on your own machine.

Is my data sent to a server?

Yes. Your browser checks that the input really is Base64-encoded Zstandard, then sends it to our server, which decompresses it and sends the text back. Nothing is sent until you click Decompress. Don't paste secrets you wouldn't want to leave your machine.

What if the original data was binary?

The result is shown and downloaded as UTF-8 text. JSON, XML, CSV and logs come back exactly as they were compressed, long numbers and accented characters included. If the original was an image or an archive, bytes that aren't valid text show up as � and the page warns you; for those, decode the Base64 and run zstd -d locally.

Is the Zstandard decompressor free?

Yes, free and with no sign-up. Our Zstandard Compressor does the reverse, and the JSON formatter is handy for tidying up JSON you get back.

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