Why are the filenames garbled, and how do I fix them?

Older Windows zip tools store names in the system code page (GBK for Simplified Chinese) without the UTF-8 flag, so other systems read them as UTF-8 and get mojibake. Pick the right encoding under "Filename encoding" — the tool also guesses one for you — and the names, including the extracted files, come out correct.

Can it open password-protected zips?

Yes. When the archive contains encrypted entries a password box appears; ZipCrypto and AES-128/192/256 are all supported. The password is used locally for decryption and is never sent anywhere.

What is the difference between "Download" and "Extract to folder"?

"Download" packs your selection into a fresh zip (a single selected file downloads as-is). "Extract to folder" uses the browser's file system API: you pick a directory and the files are written into it with their subfolders, like a desktop unzip tool. That option currently works in Chrome, Edge and other Chromium browsers.

Can it handle big archives?

Yes. The directory and each file are read on demand rather than loading the whole archive into memory, so zips of several hundred MB to a few GB open fine. Extracting many large files at once is what uses memory — do it in batches if you hit a limit.

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📦Unzip Files Online - Open ZIP in the Browser, Fix Garbled Names

Drop a zip in and see what is inside: a folder tree with sizes, previews for text and images, and extraction of just the files you want. Encrypted archives only need the password, and garbled filenames can be fixed with one click. The archive never leaves your browser.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Unzip Online

1Drop or choose a .zip file
2Tick the files you want in the tree; click a name to preview it
3Click "Download selected", or use "Extract to folder" to write straight to disk

FAQ

Why are the filenames garbled, and how do I fix them?: Older Windows zip tools store names in the system code page (GBK for Simplified Chinese) without the UTF-8 flag, so other systems read them as UTF-8 and get mojibake. Pick the right encoding under "Filename encoding" — the tool also guesses one for you — and the names, including the extracted files, come out correct.
Can it open password-protected zips?: Yes. When the archive contains encrypted entries a password box appears; ZipCrypto and AES-128/192/256 are all supported. The password is used locally for decryption and is never sent anywhere.
What is the difference between "Download" and "Extract to folder"?: "Download" packs your selection into a fresh zip (a single selected file downloads as-is). "Extract to folder" uses the browser's file system API: you pick a directory and the files are written into it with their subfolders, like a desktop unzip tool. That option currently works in Chrome, Edge and other Chromium browsers.
Can it handle big archives?: Yes. The directory and each file are read on demand rather than loading the whole archive into memory, so zips of several hundred MB to a few GB open fine. Extracting many large files at once is what uses memory — do it in batches if you hit a limit.