How to open .ZST files on iOS
To open .ZST files on 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.
Step-by-step instructions
- 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.
Common 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.
Security note
.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.