Archive files such as ZIP and 7z can hide their structure until you unpack them. For large archives or files received from someone else, it is often more practical to inspect the folder tree and file types first, then extract only what you actually need.
Being able to list an archive does not prove that its contents are safe. This guide uses Archive Explorer to inspect structure, sizes, compression ratios, filenames, and previews before deciding what to extract.
Why inspect an archive before extracting everything
Extracting an archive immediately can create deep folder trees, thousands of small files, or unexpected executable files all at once. Listing it first lets you see the top-level structure, identify the largest entries, and locate the data you actually need.
Backups, asset packages, and log bundles often contain much more than the one or two files you need. Selective extraction keeps the destination cleaner and reduces follow-up work.
- Folder depth and total file count
- Largest files
- Executables or scripts
- Double extensions or unusual path patterns
Preview images, text, and unknown binaries selectively
You do not need to save every entry just to understand an archive. Archive Explorer can preview supported images, text, and source files, which is useful when filenames alone do not reveal whether an entry is relevant.
For unknown binaries, the first bytes can be viewed as Hex and ASCII to provide format clues. This is not a malware scanner. Supported nested archives can also be opened for inspection without first saving them as separate files.
Review compression ratios and filename warnings
Extremely high compression ratios, parent-directory paths such as `../`, absolute paths, executable extensions, and double extensions are all worth reviewing before extraction. Archive Explorer flags patterns like these heuristically.
A warning does not prove that a file is malicious, and the absence of a warning does not prove that it is safe. For untrusted downloads or important systems, combine archive inspection with operating-system and security-tool checks.
Understand format-specific limitations
Archive support depends not only on the filename extension but also on the compression and encryption methods used inside the container. Archive Explorer recognizes ZIP, 7z, RAR5, TAR, GZIP, CAB, ISO, and LZH/LHA, but it cannot fully extract every possible variant.
For example, ZIP Stored/Deflate and legacy ZipCrypto are supported, while AES-encrypted ZIP and Deflate64 have limitations. Some 7z and RAR structures may be list-only. Check the capability indicator first to see whether the archive is fully extractable, partially extractable, or available for listing only.
Step by step
- Open Archive Explorer and select or drop a ZIP, 7z, RAR, TAR, GZIP, or another supported archive.
- Check the capability indicator and folder tree, then review file counts, file types, and the largest entries.
- Select relevant images, text, code, or binaries and inspect them in the Inspector.
- Review warnings for unusual compression ratios, double extensions, executables, or suspicious path patterns.
- Save only the entries you need. Multiple selected files can also be packaged into a new ZIP.
Archive Explorer
Explore ZIP, 7z, RAR, TAR, GZIP, CAB, ISO, LZH, and more before extraction, then preview or save only what you need.
Tips and limitations
- For large archives, start with the Archive Map or largest-file view to understand the package quickly.
- For legacy password-protected ZIP files, enter the password only when encrypted data is needed. AES-encrypted ZIP is not currently supported.
- Warnings are not a security verdict, so inspect untrusted files with appropriate security software as well.
Frequently asked questions
Can I inspect an archive without extracting everything?
Yes. Supported formats can be listed first, and selected entries can be previewed or extracted. Some formats may still require internal stream expansion.
Does it work with RAR and 7z files?
They can be inspected, but extraction support depends on the internal method. Selected LZMA 7z structures and RAR5 Stored are supported; encrypted or unsupported codecs may remain list-only.
Can it automatically determine whether a suspicious file is safe?
No. It highlights patterns such as unusual paths, executables, double extensions, and extreme compression ratios, but it is not a malware scanner and cannot certify a file as safe.
Are the archive or ZIP password uploaded to a server?
No. Archive parsing, previews, and supported password handling run in the browser, and entered passwords are not persisted.