ZIP Inspector
Drop a ZIP and see every file inside — sizes, contents, and per-file download — without unpacking it locally.
How to use
- Drop a .zip file or click to choose one.
- Browse the entries; click any file name to preview.
- Use the per-row Download button to save a single file.
About this tool
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Drag in a ZIP archive and see the file tree, each entry's size, and the total uncompressed size before you commit to unpacking anything. Click a text entry — source, JSON, a config file, a log — for an inline preview, or pull out a single file without extracting the rest, which is the quick way to answer whether a download is what it claims to be. The archive is read in the page by fflate, which is pulled in only when you actually open a file so it never delays the first paint. Nothing is uploaded and nothing is written to disk, but the entries are decompressed in memory, so a very large archive is limited by the RAM of the device. Password-protected archives cannot be opened.
Frequently asked questions
Is the ZIP uploaded?
No. fflate unpacks the archive in memory inside your browser — the ZIP and its contents never leave your device.
Which ZIPs are supported?
Standard ZIP archives compressed with the Deflate algorithm (what most tools produce). Encrypted ZIPs and Zip64-only archives may not open.
Why are some files shown as 'binary'?
The preview decodes as UTF-8 text. If the first bytes contain many non-printable characters, the file is treated as binary and the preview is skipped — but you can still download it.
How big a ZIP can I open?
Limited by your browser's available memory. Hundreds of MB usually works; multi-gigabyte archives may be slow or fail to load.
Why does the uncompressed total matter more than the file size?
Because that is what will land on your disk, and it is the number a download does not show you. A 40 MB archive of logs or CSV can expand past a gigabyte, so checking the total before unpacking is the cheap way to avoid filling a drive or a container volume.
Can I check an archive I do not trust?
For its contents, yes — listing entries and reading a text file never executes anything, and nothing leaves the page. What it cannot tell you is whether a file is safe to run once extracted. Treat the listing as a look inside the box, not as a verdict on what is in it.
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