How do you open a ZIP file, and why won't the files inside open?
Extracting a .zip you were sent, and telling locked, garbled and RAR archives apart
A school, an accountant or a client sent you everything in one file called "documents.zip". On your computer you double-clicked it and saw the PDFs listed inside, but when you tried to open one the program complained, or the change you made simply vanished. On your phone, tapping the file did nothing at all. This article is for that moment: how to "extract" a ZIP, which button to press on each device, and the three situations where it goes wrong.
Keep one idea in mind: a ZIP is not a document, it is a box. The files inside are not fully usable until they are taken out of the box. In other words, the command you are looking for is usually not "open" but "extract".
You can see the files inside, so why won't they open?
Windows File Explorer shows a ZIP you double-click as if it were an ordinary folder, complete with file names and sizes. But that view is a shop window: the files are still packed inside the compressed box. When you double-click one of them, Windows copies it to a temporary location and opens that copy. Some programs open the temporary copy read-only, and programs that need several files side by side cannot find the others. Even if you edit and save, the change is not written back into the ZIP.
A Mac is simpler: double-clicking a .zip extracts it straight away, and the contents appear in the same place. If a Mac still shows you names it cannot open, the archive is most likely password-protected or incompletely downloaded; both cases are covered below.
Extracting a ZIP on each device
Every route below is already built into your device; there is nothing extra to install. Once the files are out you can delete the ZIP, but open what came out at least once before you do.
| Device | What to do | Where the files end up |
|---|---|---|
| Windows PC | Right-click the ZIP, choose Extract All… and follow the window that opens | In a new folder named after the ZIP, wherever you pointed it |
| Mac | Double-click the ZIP | In the same folder as the ZIP |
| iPhone and iPad | In the Files app, find the ZIP and tap it | In a new folder right next to it; tap the folder to open it |
| Android | In Files by Google, select the ZIP, tap Extract, then Done | In the same folder as the ZIP |
| None of these worked | Pick the archive in this site's Unzip Files Online tool | Each file with its own Download button, into your Downloads folder |
At a glance: looking, extracting and passwords
The diagram follows one ZIP down three different paths. The top row is looking through the shop window, the middle row is a real extraction, and the bottom row is what happens with a password-protected archive. Find the row that matches your problem and jump to its section.
Password-protected ZIP: names visible, contents locked
A ZIP password locks what is inside each file, not the file names. That is why you can browse the list of a locked archive without trouble, yet the moment you extract or open something you are asked for a password or get an error. The file is not broken.
Do not try to guess the password; whoever sent the archive should have given it to you separately. If it is not in the same email, look for a separate message such as a text or a second email, and if you cannot find one, ask the sender.
Once you have the password, a program that asks for it, such as 7-Zip on Windows, will do the job. This site's Unzip Files Online tool does not decrypt: it skips locked files and its result line counts the ones it could not open, and if the whole archive is locked it says so plainly. The RAR and 7z support that Windows 11 gained later does not cover password-protected archives either.
When file names come out as strange symbols
If a name like "résumé.pdf" turns up full of odd symbols, the problem is not the file but the character table the name was written with. ZIPs made with older versions of Windows store names using the old code table of that Windows language; a program that assumes a different table turns accented letters into other symbols. The contents are untouched: the PDF is still the same PDF.
You have two options. Rename the file after extracting it; changing the name never changes the contents. Or open the archive in the Unzip Files Online tool: it first tries to read names as today's common encoding (UTF-8) and, if that fails, falls back to the original US table of old Windows. Names written in a non-Latin alphabet by an old Windows can still come out garbled; renaming is the cure there.
Got a .rar or .7z? That is not a ZIP
RAR and 7z also pack several files into one box, but they are different formats from ZIP, and renaming the file to .zip does not change what is inside. Built-in phone file apps are limited here: the Files by Google help page states plainly that only .zip files are supported.
On a computer, an up-to-date Windows 11 can open RAR and 7z archives in File Explorer too; Microsoft added this in the October 2023 update KB5031455, password-protected archives excepted. On older Windows, the free 7-Zip program does the same. The tools on this site read ZIP only; give them a RAR or 7z and they recognise the format from the file's first bytes and name it, rather than wrongly calling the file damaged.
If you need to upload everything as a single PDF
Sometimes the only reason to open the ZIP is to upload the scans and photos inside to an application form as one file. Extracting first and then combining is an unnecessary detour. The ZIP to PDF tool takes the archive itself and turns the JPG, PNG, WEBP, GIF, BMP and PDF files inside into one document, sorted by file name.
Word documents, iPhone HEIC photos and a ZIP tucked inside the ZIP do not go through; the tool skips them and lists their names in the result line. If your archive has files like these, take them out one by one with Unzip Files Online first; a Word file can then go through the Word to PDF Converter.
Frequently asked questions
Can I delete the ZIP after extracting it?
Yes, the extracted files no longer depend on the ZIP. Still, open them once to check; if the archive was cut short during download, you want to still be able to download it again.
Do I need to install an app to open a ZIP on my phone?
Usually not. The Files app on iPhone and Files by Google on Android extract ZIPs by themselves. If your phone's file app cannot, use the Unzip Files Online tool in your browser; the archive never leaves your device.
There is another ZIP inside my ZIP. What now?
The inner ZIP is a separate archive. After extracting the outer one, open the inner one the same way. In the Unzip Files Online tool you download the inner ZIP as it is and then give it to the tool again.
The ZIP opens but there are no files in it. Why?
The archive may contain only empty folders or the operating system's own hidden files, which means the real documents were never put in the box. Ask the sender to build the archive again.
What does "not a valid archive" mean?
Most often the download stopped halfway, or the file is named .zip but holds a different format. Download it again and wait until the download has fully finished; if it still fails, ask the sender to resend it.
Last updated: October 12, 2026