Zip file won't open: find your error message

The person who sent it often says it opens fine on their machine, and they are often right. A lot of these errors come from the extractor built into your system, a download that did not finish, or a password, not from a broken file.

Look up the error message

"The compressed (zipped) folder is empty": is it really empty?

The wording suggests the sender zipped nothing. That is rarely what happened. A zip keeps its list of contents at the very end of the file. If the last part never reached your computer, Windows finds no list and calls the folder empty, even when the file on your disk is several gigabytes.

It is one of the most common zip questions on Microsoft Q&A: a thread titled "The compressed (zipped) folder is empty" collects people who see exactly this message, and a separate one covers "The compressed (zipped) folder is invalid", the row in the table above for a file Windows does not recognise as a zip at all. In both cases the first check is the same: is the file complete, and is it really a zip?

Downloads from cloud storage are the usual suspects. Select several files or a folder in OneDrive and press Download, and Microsoft sends them as one zip, with limits such as 10,000 files at most. Google Drive packs large downloads into several separate zips (2GB each, according to Google's 2016 announcement), so the one you opened may be only one part of the set, and you need every part.

• Compare sizes. Ask the sender how big the zip is, or check the size shown on the download page. If yours is smaller, it did not finish.
• Look in your Downloads folder for a file ending in .crdownload (Chrome) or .part (Firefox). That is a download the browser has not finished.
• If the size matches exactly and Windows still says empty, the file is probably fine and the built-in extractor is the problem. Try another extractor before asking for the file again.

Password-protected zip: Error 0x80004005

With a password-protected zip, the Windows extractor either asks for the password or fails with "Error 0x80004005: Unspecified Error" without ever asking. The difference is the kind of encryption. The old, weak zip encryption works in Windows. AES, the stronger option in tools like 7-Zip and WinZip, does not.

WinZip and 7-Zip handle both kinds, the same answer adds. The message is not always 0x80004005: in another Microsoft Q&A thread, about "The destination file could not be created" (2,800+ people with the same question), an answer blames the same thing: "Windows doesn't support strong encryption and won't be able to decrypt the file." The October 2023 update that taught Windows 11 to open .rar and .7z does not help here either. Microsoft's notes for it say: "This features does not support password encrypted files."

So get the password by a different route than the message that carried the zip (sending both together protects nothing), then open it with something that understands AES: 7-Zip or WinZip if you can install software, or the browser extractor below if you cannot.

Mac: Error 79 and Error 1

Double-clicking a zip on a Mac hands it to Archive Utility. Its Error 79, "inappropriate file type or format", means it does not recognise what it got. On the IPUMS forum, where researchers download large data files, a Mac user reported exactly this. The reply:

Error 1, "Operation not permitted", is vaguer, and we could not find an Apple document that explains it for Archive Utility. Treat these as things to try, not a diagnosis:

• Check free space. Apple's own help page on zips says to make sure there is enough space on your Mac for the unzipped item, and if the zip came from someone else, to ask them to zip it again and resend it.
• Move the zip to your Desktop or Documents folder and double-click it there.
• Try another extractor, such as The Unarchiver or the browser extractor below.

File names come out as gibberish

Sometimes the zip extracts, but the names are nonsense. The files are usually intact. Only the character encoding of the names went wrong, and there are two common versions of this.

Japanese or Korean names from an older Windows PC

Japanese and Korean versions of Windows have long written zip file names in their own local encoding (Shift_JIS for Japanese), without marking which one. An English system reads the same bytes as Western characters. This Super User question, viewed more than 167,000 times, shows what that looks like:

The asker had switched Windows' language for non-Unicode programs to Japanese, which "does funny things to other programs". The answers offer gentler routes: Ctrl+E in WinRAR to pick the language, or 7z x -mcp=932 archive.zip on the 7-Zip command line (932 is the Japanese code page). The extractor on this site tries Japanese and Korean encodings on its own, and in our tests it restored typical names with no settings to change. Inside AES-protected zips, old-encoding names may stay garbled.

Korean names from a Mac

Here the Mac writes the names correctly, but in a form Windows does not expect. As Bandizip's documentation puts it, "Mostly, macOS uses NFD and Windows uses NFC." For Korean, each syllable falls apart into separate letters, so 한글 shows up as something like ㅎㅏㄴㄱㅡㄹ. Our extractor does not repair this. Rename the files, or ask the sender to zip them with a Mac tool that converts names for Windows (Bandizip for Mac documents this option).

It is not actually a zip

The extension may be .rar, .7z or a regional format rather than .zip, or someone renamed a .rar to .zip. What Windows can open on its own depends on the version.

Asking for it again as a zip is usually quickest, since almost everything can produce one. Otherwise use an extractor that looks at the contents rather than the extension.

Split archives: which part do you open?

Big downloads, game files especially, often arrive as numbered pieces. A Steam Deck owner asked on r/SteamDeck what order multi-part RAR files go in, and someone on r/linux_gaming wanted to know how to extract four RAR files together. The answer is the same on Windows, Mac and Linux: you do not extract the parts one by one.

• Put every part in the same folder and keep the names exactly as they were downloaded.
• Open only the first part: name.part1.rar or name.7z.001. For a set of .z01, .z02 and a .zip, open the .zip. Older sets of .rar, .r00, .r01 start from the .rar.
• The extractor reads the rest in order. If a part is missing or did not finish downloading, it stops with an error, often one that asks for the missing volume.

Joining parts needs an extractor installed on a computer: 7-Zip or WinRAR on Windows, The Unarchiver on a Mac, an archive manager on Linux (a Steam Deck has one in desktop mode). The browser extractor on this site opens one file at a time and cannot join parts.

Opening a RAR or 7z on a work PC, Chromebook, Mac or phone

That table is why a .rar or .7z is the file that most often gets stuck. The standard advice is to install WinRAR or 7-Zip, which assumes a computer you control.

The questions keep coming. On r/techsupport, one person wanted to unzip a .rar without downloading anything, and another needed to open one on a Windows PC with no rights to install software. Chromebook owners ask about RAR files in r/chromeos. On Apple Community, an iPhone user asked how to open a RAR at all, and a Mac user running Sonoma asked the same.

• Work or school PC: installing software usually needs an administrator. Windows 10 has no built-in way to open RAR or 7z, and Windows 11 only covers them after the October 2023 update, and never with a password.
• Chromebook: Windows programs such as 7-Zip do not run on it, and a school-managed one may block extra apps as well.
• Mac: Archive Utility opens a .zip when you double-click it, but not a .rar, so the usual advice is to install another app.
• Phone: on an iPhone, tapping a ZIP in the Files app unzips it. For a RAR or 7z, most guides send you off to install yet another app.

All three have a browser, and that is usually enough. The extractor on this site opens RAR and 7z there with nothing to install: the first one downloads a 1.5MB extraction engine once, then the file list appears and you save only what you need. On an iPhone the saved files go to the Files app (Downloads folder), on Android to the Download folder. On a phone, stick to smaller archives, since the whole archive is held in memory.

Open a RAR or 7z in your browser

Zips and RARs downloaded on a phone

In India a lot of archives are opened on a phone first: a ZIP of certificates from a college office by email, a RAR of project files forwarded on WhatsApp, a set of scanned documents from a cyber cafe. The file lands in the Download folder or WhatsApp's Documents, and tapping it gives "can't open file" or asks you to pick an app. Many phones need an extra app for RAR and 7z.

• Check the size first. A WhatsApp or email download that stopped halfway shows the same errors as a broken file. If it looks smaller than the sender says, download it again on Wi-Fi.
• Open the zip tool in Chrome, choose the file from Downloads, and save only the files you need. They go to the Download folder.
• 7z and RAR files with Hindi, Tamil or other non-Latin file names open in the browser extractor with the names intact.
• "Download all (ZIP)" gives you one ZIP of everything, with the folders inside the archive kept as they were.
• Phones hold the whole archive in memory, so stick to smaller archives; open very large ones on a computer.

WinRAR's trial pop-up

WinRAR is the program most guides tell you to install for a .rar. It is paid software with a trial period, and once the trial is over it still opens archives but keeps showing a window asking you to buy a licence. That window has a reputation: a post on r/unpopularopinion argues WinRAR should simply let you switch the pop-up off, and r/pcmasterrace jokes about how WinRAR users treat the expired trial.

If you install something, 7-Zip is free and has no trial. If you cannot or would rather not install anything, the browser extractor on this site has no trial, no licence reminder and no account either.

Extract without installing anything or using Terminal

Many videos about these errors end with "install 7-Zip". The comments show where that stops working. One viewer complained that a video "doesn't say how to fix said problem", another asked what to do "if I don't have the "7 zip" button", and a third summed up the attempt as "7 zip.... Not found.... Fail." On a work or school computer, installing software is often blocked, and not every Mac user wants to open Terminal.

The extractor on this site runs in the browser and uploads nothing. It opens .zip, .7z, .rar, .tar, .gz, .xz and .bz2, checks the file's first bytes instead of trusting the extension (so a renamed .rar still opens), and shows the file list before anything is saved. Since 30 September 2026 it asks for the password when an archive has one, AES zips included, and says "That password is not correct" instead of handing you broken files. In our tests, 7z and RAR (RAR5) archives with Korean and Arabic file names extracted with the names intact, and "Download all (ZIP)" keeps the original folder structure.

Extract a zip, 7z or rar in your browser

What it cannot do: it holds the whole archive in memory, so very large archives can fail on an ordinary laptop. It cannot find a password you do not have, finish a download that stopped halfway, join split archives, or fix the Mac Korean names above. If you can install software, 7-Zip on Windows and The Unarchiver on a Mac are the usual picks.

Look before you extract

With archives from people you do not know, checking the file list first is a good habit. An .exe, .scr or .js file among what should be documents is your cue to stop.

If you were expecting a document and find a program, do not open it.

Sometimes looking is all you want. A Mac user on r/osx asked how to view what is in a RAR without extracting it. The browser extractor shows names, folders and sizes as soon as you choose the archive, and nothing is written to your disk until you save a file.