ZIP Extractor

ZIP Extractor opens an archive by reading its central directory first — the index at the end of every ZIP that lists each entry's name, its compressed and uncompressed size, and whether it is password-protected. That index is parsed here rather than left to the decompressor, so the tool knows how many entries there are and how much they claim to expand to before a single byte is inflated. Only the entries that survive the safety checks and your name pattern are then decompressed, using a copy of the fflate library served from this site rather than a third-party script.

Two settings decide what comes out. "Only extract names matching" takes a small glob: * matches within one folder, ** crosses folders, ? stands for a single character, and case is ignored. The pattern is tried against the entry's full path and against the file's own name, so *.csv finds every CSV at any depth without your knowing the folder layout, while docs/** takes one branch of it. Leave the box empty and everything comes out. "Flatten folders" discards the paths and keeps bare file names; if two folders each hold a readme.txt, the second is saved as readme (2).txt instead of quietly replacing the first.

Your archive never crosses the network. It is read by this browser tab, unpacked in memory, and the extracted files exist only as data in the page until you save them or press Clear now. The single exception is fflate itself, which arrives from this site the first time you open an archive rather than loading with the page: the script comes down, and nothing of yours goes up. That is what makes the tool usable on a machine where you cannot install software, and on an archive you would rather not hand to a stranger to open. The cost is memory and a busy tab — unpacking runs on the page's own thread, so a large archive holds it still for a few seconds, and everything that comes out has to fit in memory at once.

The limits are firm and worth knowing before you start. Password-protected entries are skipped and counted in the summary, and an archive in which every file is encrypted is refused outright, because there is nowhere here to type a password. An archive holding more than 5,000 entries, or one whose directory claims it will expand past 2 GB, is refused with a message pointing you at a desktop tool; that guard exists for zip bombs and it fires on large legitimate archives too. RAR, 7z and tar.gz never get past the opening signature check, since none of them begin with the two bytes a ZIP begins with; a split volume or a download that stopped early does begin correctly, and is turned away one step later when the end-of-archive record cannot be found. Only the stored and deflate methods unpack here, so a single entry packed with bzip2, LZMA or deflate64 stops the whole job with an error naming the method — though a name pattern that leaves that entry out lets everything else through.

Runs on your device. Your file is processed directly in this browser.