Zip & Unzip

Create a zip by choosing files or dropping them anywhere on the page, give the archive a name, and download it. Files are compressed with deflate, the method every zip program understands, so the archive opens with Windows Explorer, macOS Finder, Linux's unzip and anything else. Formats that are already compressed — JPEG and PNG images, MP3 and MP4 media, PDF and Office documents, other archives — are stored as they are instead of being compressed again, which saves time and makes no difference to their size. Two files with the same name both go in: the second becomes name (2).ext, so neither overwrites the other when the zip is opened.

Open an archive — a .zip, or a .tar, .tgz or .tar.gz of the kind source code and Linux software ship in — to see every file inside with its full path and size, and save the ones you need one at a time. Small text files — source code, CSV, JSON, Markdown, logs — can be previewed right on the page before you decide. Folders inside the archive are shown as part of each file's path. The hidden __MACOSX and ._ entries that a Mac adds are left out, since they hold metadata rather than your files, and so are a tar's symbolic links, which have nothing to save. A path that tries to climb out of its folder, such as ../../etc/passwd, is shown and saved with the climbing parts removed.

Everything happens in your browser using the open-source fflate library; your files are never uploaded, and the page keeps working offline once loaded. Because the whole archive is held in the tab's memory, an archive that says it unpacks to more than 512 MB is refused before any of it is decompressed — this also stops a "zip bomb", a tiny file built to expand to gigabytes. A .tar.gz declares no total in advance, so it is stopped the moment decompressing it passes 512 MB.