How to Unzip Files on Windows, Mac, iPhone, Android and Chromebook

A ZIP is a single file that holds other files and folders, usually compressed so the bundle is smaller than the parts. Phil Katz introduced the format with PKZIP in 1989, and his company PKWARE published the specification, known as APPNOTE, so anyone could write software that reads it. That openness is why ZIP became the default way to send a batch of photos, a folder of course material or a set of scanned forms: the person on the other end almost never has to install anything to open it.

Inside, each file is stored with its own name, size, date and a CRC-32 checksum, and most are compressed with the Deflate method. At the very end of the file sits the central directory, a table of contents that lists every entry and where it starts. That layout matters when things go wrong. An unzip program reads the central directory first, so if the last few kilobytes of a download are missing, the archive often refuses to open at all, even though most of the data arrived.

Unzipping, or extracting, simply means copying the files out of that container and decompressing them back to their original bytes. Nothing about the documents themselves changes. A photo extracted from a ZIP is identical to the photo that went in, and the ZIP stays where it was unless you delete it. You can also browse a ZIP without extracting it on most systems, but programs often cannot open files that are still inside, which is why extracting first saves trouble.

Windows has opened ZIP files natively since Windows XP, where they appear as compressed folders with a zipper on the icon. Double-clicking one opens it like a normal folder, which tempts people to run an installer or edit a document straight from inside. That works poorly: Windows extracts the file to a temporary location, and your changes or the installer's companion files go missing. Use Extract All instead. Since the Windows 11 update of 2023 (version 23H2), the same right-click menu also extracts RAR, 7z, TAR and GZ archives, using the open-source libarchive library.

On a Mac, double-click the ZIP in Finder. Archive Utility, which lives in the system and has no Dock icon, unpacks it into a folder with the same name in the same location, usually Downloads. If you prefer Terminal, the unzip command is preinstalled, and unzip -l file.zip lists the contents without extracting. Archive Utility also handles TAR, GZ and BZ2, but it does not open RAR or 7z files, so a Mac user who receives one needs a separate app or a browser-based extractor.

One habit helps on both systems: extract into a fresh folder rather than into a crowded Downloads folder. Archives made by other people often contain dozens of loose files with no parent folder, and extracting them straight into Downloads scatters them among everything else you have saved. A dedicated folder also makes cleanup easy: once you have checked the files, you can delete the ZIP and keep only the extracted copy, or the other way round.

Phones are where ZIP files cause the most confusion, because a ZIP opened from a mail app or a browser often shows only a preview or a blank page. The fix is the same on every platform: save the file first, then open it from the device's file manager. Apple added ZIP support to the iPhone Files app in iOS 13 in 2019. Tapping a ZIP there creates a folder with the same name next to it, and you can share any file inside to Photos, Books or another app. On Android, Files by Google does the job; Samsung phones can also use the preinstalled My Files app, which offers an Extract button for ZIP files.

ChromeOS treats a ZIP like a drive. Opening it in the Files app mounts the archive in the left sidebar, and you can drag or copy the contents into Downloads or Google Drive. Recent ChromeOS versions also add an Extract all option to the right-click menu. Whatever the device, check free space before extracting a large archive: the unpacked files can take noticeably more room than the ZIP, especially for text, spreadsheets and code, which compress well. Photos and videos are already compressed, so a ZIP of them is close to their full size.

ZIP is the only archive format that every system opens out of the box. RAR, created by Eugene Roshal in 1993, is owned by RARLAB, the maker of WinRAR; anyone may write software that extracts RAR, but not software that creates it. 7z is the native format of the free, open-source 7-Zip, first released in 1999, and it usually packs smaller than ZIP. TAR.GZ comes from the Unix world and is common for source code, server backups and Linux downloads.

On Windows 11 23H2 or later, RAR and 7z extract through the same Extract All menu as ZIP. Everywhere else, including Windows 10, macOS, the iPhone and most Android phones, you need an extra app or a browser tool. If you just want the files, unzip online reads RAR, 7z, TAR, ISO and more without installing anything. If you need to pass the archive on to someone who will struggle with it, convert the RAR to a ZIP once and send that instead; the files inside are repacked unchanged.

Which format to choose when you create an archive yourself is a separate question, covered in ZIP vs RAR vs 7z. For receiving files, the rule is simple: ZIP for anything you send to other people, and whatever arrives in another format can be opened in a browser or turned into a ZIP in under a minute. Archives with an .exe extension are a special case: they are self-extracting programs that only run on Windows, and you should run them only when you trust the sender.

A password-protected archive asks for the password when you extract, or sometimes when you open the first file inside. ZIP has two kinds of protection. The original ZipCrypto scheme from the early 1990s is weak but widely supported, while AES-256, used by 7-Zip and WinZip, is strong but not understood by every built-in tool. Windows' Extract All has long handled only ZipCrypto, so an AES-protected ZIP can fail there with a vague error such as 0x80004005 even when the password is right. A dedicated extractor that supports AES opens it normally.

Split archives are one large archive cut into pieces, usually to get around email or upload limits. You will see names like photos.zip with photos.z01 and photos.z02, backup.7z.001 and backup.7z.002, or video.part1.rar and video.part2.rar. The pieces only make sense together. Put every part in the same folder, keep the original names, and open the first part, or for ZIP the file ending in .zip; the extractor reads the rest in order. Built-in tools on phones generally cannot join parts, so a desktop extractor or a browser tool that takes several files at once is the practical route.

If one part is missing, the files stored in that part, and any file that crosses its boundary, cannot be recovered. Before assuming the archive is corrupt, count the parts and compare their sizes: all parts except the last are normally the same size, so a short part in the middle points to a download that stopped early.

Most extraction errors mean the file you have is not the file that was sent. Downloads stop early on weak connections, links expire and return an error page that gets saved with a .zip name, and cloud services sometimes hand out a preview instead of the original. Before trying a different program, check the file size in your file manager and compare it with what the sender or the download page states. If they differ, download it again on a stable connection, ideally on a computer rather than a phone. The messages below use the wording of the most common tools.

The built-in tools cover ZIP files on every device, so an online extractor earns its place in a few specific cases: a RAR or 7z on a Mac, iPhone or Windows 10 PC; a work computer where you cannot install software; a Chromebook with an unusual format; or a ZIP that Windows refuses because of AES encryption. In those cases a browser tool saves you from hunting for a trustworthy app and granting it access to your files.

UltKit's extractor takes one archive of up to 95 MB at a time, asks for the Archive password if there is one, and lets you save the contents as Individual files or One ZIP. For multi-part archives, the archive converter accepts all parts in one batch of up to 20 files. Uploads and results are deleted 30 minutes after processing, and nothing needs to be installed or signed up for. For very large archives, private documents you would rather not upload anywhere, or files you extract every day, a desktop app like 7-Zip is still the better long-term tool.