.ZST file extension
To open .ZST files on Windows, if the file is a plain “something.zst”, open it in PeaZip and extract it to produce the original file.
To open a .zst file, you typically decompress it with a tool that supports Zstandard, such as PeaZip, or with zstd-capable tooling on Linux. If the file is named .tar.zst, first decompress the .zst layer, then open/extract the resulting .tar archive.
Last updated: October 13, 2026
Open on your device
Choose your operating system for a dedicated step-by-step opening guide.
How to open .ZST files
Use these platform-specific instructions to open .ZST files safely.
Windows
- If the file is a plain “something.zst”, open it in PeaZip and extract it to produce the original file.
- If it is “something.tar.zst”, extract once to get “something.tar”, then open/extract the .tar with your archive tool.
Mac
- If you have a tool that supports Zstandard (for example, PeaZip), use it to extract the .zst file.
- For “.tar.zst”, extract the .zst first, then open/extract the resulting .tar archive.
Linux
- If it is “.tar.zst”, use GNU tar’s zstd association: extract with tar configured to use zstd support (commonly available in GNU tar setups) to produce the files.
- If it is a plain “.zst” (not a tar), decompress it with a zstd-capable tool, then open the resulting file with the appropriate application.
iOS
- iOS support varies by app; if you can’t find an app that can extract Zstandard, transfer the .zst (or .tar.zst) to a desktop tool (for example, PeaZip) to decompress it.
Android
- Android support varies by app; if you can’t extract it on-device, transfer the file to a desktop tool (for example, PeaZip) to decompress it.
Security notes
- .zst is a compressed container, not a document format; the main risk is what the decompressed content is (executables, scripts, or other risky files). Treat extracted files as untrusted until you know their origin.
- Be cautious when extracting .zst or .tar.zst from untrusted sources: compressed data can expand significantly during decompression (resource/space exhaustion). Extract to a location with enough disk space and avoid auto-extracting unknown files.
- Zstandard parsers are complex; prefer well-maintained tools and libraries that follow the RFC 8878 format to reduce exposure to malformed-file bugs.
Can't open this file?
These are the most common causes and fixes when .ZST files fail to open.
Common reasons
- I extracted a .tar.zst and got a .tar file—now what?
- My archive tool says the .zst format is not supported
- Decompression fails or produces a corrupted output file
Fix steps
- Extract/decompress the .zst layer to produce the .tar file.
- Open/extract the .tar file with your archive tool to get the final files.
OS-specific troubleshooting
What is a .ZST file?
A .zst file stores data encoded using the Zstandard compression format, which is a lossless compressor designed for file and stream compression. The format is specified in RFC 8878, and the registered media type is application/zstd. The compressed data is carried in a Zstandard “frame” structure as described in the format documentation.
Background
Zstandard (often abbreviated “zstd”) is a lossless compression format used to reduce file size while allowing the original data to be restored exactly. The IETF specification (RFC 8878) defines both the compressed data format and the associated media type application/zstd, and it also documents the use of the .zst filename extension.
Common MIME types: application/zstd
Other meanings of .ZST
The extension .ZST is used by several programs. Besides the file type described on this page, it can also stand for:
- ZSNES Save File
Further reading
Authoritative resources for more details on the .ZST format.
Common .ZST issues
I extracted a .tar.zst and got a .tar file—now what?
.tar.zst is a tar archive that has been compressed with Zstandard. Decompressing removes only the zstd layer and leaves the tar container, which still needs to be unpacked.
- Extract/decompress the .zst layer to produce the .tar file.
- Open/extract the .tar file with your archive tool to get the final files.
My archive tool says the .zst format is not supported
Not every archiver includes Zstandard support. The file is likely fine, but your tool can’t decode Zstandard frames.
- Use an extractor that explicitly supports Zstandard .zst (for example, PeaZip).
- If you’re on Linux and working with .tar.zst, use GNU tar in a setup that supports zstd for the .zst-compressed tar.
Decompression fails or produces a corrupted output file
The .zst data may be incomplete (truncated download), damaged, or not actually Zstandard data despite the extension.
- Re-download or re-copy the file to rule out truncation.
- Try extracting with a different Zstandard-capable tool to confirm whether the file is valid.
FAQ
What is the MIME type for .zst files?
The registered media type for Zstandard-compressed data is application/zstd (RFC 8878, listed in the IANA media types registry).
Is .zst the same as .tar.zst?
No. “.zst” is Zstandard-compressed data (often a single file’s data). “.tar.zst” is a tar archive that has been compressed with Zstandard; you typically decompress, then extract the tar.
Can GNU tar handle .tar.zst?
GNU tar associates the .zst suffix with the zstd compressor, which reflects common usage of .tar.zst archives.
Similar file extensions
Compare related formats in the same category to find the right tool faster.