Your files never leave your device. All processing happens locally in your browser.
How do I open and extract a ZIP file online without uploading it?
Open ZIP Extractor, then drop a .zip onto the page — or click to pick one. The tool reads the archive’s directory instantly and shows a searchable, collapsible file tree with each entry’s size, date and a lock icon on encrypted files. Click any text or image file to preview it inside the page, tick the checkboxes to choose exactly what you need, then extract: a single file downloads directly, while several are bundled into one ZIP built locally. It also opens ZIP-container formats such as .jar, .apk, .docx, .xlsx, .pptx and .epub, handles AES-256 and legacy ZipCrypto passwords, and supports ZIP64 archives up to 4 GB. Nothing is uploaded — the whole archive is read and decompressed in your browser, so your files never leave the tab.
Opens and browses ZIP archives in the browser — no upload, no WinZip or 7-Zip install
Searchable, collapsible file tree with sizes, dates and a lock icon on encrypted entries
Preview text and images inside the page before extracting anything
Selectively extract: tick files or whole folders; one file downloads directly, many are re-bundled into a ZIP
Opens password-protected (AES-256 / AES-128 / ZipCrypto) archives and ZIP64 files up to 4 GB
What is
ZIP Extractor
A ZIP extractor is a tool that opens a .zip archive, lists the files and folders packed inside it, and decompresses selected entries back to their original form. ZIP is the most common archive format: it stores many files as separately DEFLATE-compressed members with a central directory that records each entry’s path, sizes, timestamp and an optional encryption flag. A great many other formats are really ZIP containers under a different extension — Java .jar, Android .apk, Office .docx/.xlsx/.pptx, OpenDocument .odt, e-books .epub, browser extensions .xpi/.crx — so a ZIP extractor opens them too. Modern ZIPs may use WinZip AES-256/AES-128 encryption or the weak legacy ZipCrypto, and ZIP64 extensions lift the old 4 GB / 65,535-file limits. This tool reads and decompresses the archive entirely in the browser with the zip.js and JSZip libraries, so it needs no unzip command or desktop app and never uploads your data.
File Tools
Related terms
zipunziparchiveDEFLATEZIP64AES-256ZipCryptocentral directoryjarapkdocxepubdecompressionfile tree
Frequently Asked Questions
No. The archive is read and decompressed entirely in your browser, so the files never leave your device — there is no upload, server or account.
Nothing is uploaded. When you drop or pick a .zip, the tool reads it locally with the browser’s File API, parses the central directory and decompresses entries in memory with the zip.js and JSZip libraries. There is no server, API, database or tracking in the processing path, so private backups, source code and documents stay on your machine; the tool works offline once cached, and closing the tab discards everything. The only optional network use anywhere on the site is consent-gated advertising, which never sees your files.
Yes. Enter the password and it decrypts WinZip AES-256, AES-128 and legacy ZipCrypto archives on your device; the password is never sent anywhere.
When an archive contains encrypted entries the tool flags them with a lock icon and shows an inline password field. The password you type is handed only to the local zip.js decryption engine and is used in the browser to decrypt files as you preview or extract them — it is never transmitted, logged or stored. It handles the modern WinZip AES-256 and AES-128 schemes as well as the old, weak ZipCrypto method. A wrong password produces a clear error rather than a corrupt file, so you can simply try again.
Yes. Tick individual files or whole folders in the tree; a single file downloads directly and several are bundled into one ZIP built locally.
The archive is shown as a searchable, collapsible tree with a checkbox on every file and folder (folder checkboxes select everything inside, with an indeterminate state for partial picks). Choose exactly what you want and click Extract selected: if you picked one file it downloads on its own with its original name, and if you picked several they are repackaged into a single ZIP created in your browser with no re-compression, so extraction is fast and lossless. You can also hit Extract all, or use the per-file download button on any row.
Standard .zip and .zipx plus ZIP-container formats like .jar, .apk, .docx, .xlsx, .pptx and .epub; ZIP64 archives up to about 4 GB.
It opens ordinary ZIP and ZIPX archives and, because they are ZIP containers underneath, also Java .jar, Android .apk, Microsoft Office .docx/.xlsx/.pptx, OpenDocument .odt/.ods/.odp, e-book .epub and browser-extension .xpi/.crx files — letting you peek inside a document or app package. ZIP64 support lifts the classic limits, so it handles archives up to roughly 4 GB and very large file counts. Because everything runs in browser memory, the practical ceiling is your device’s RAM; it opens and extracts existing archives but does not create new ZIPs, and it is ZIP-specific rather than a RAR or 7z tool.
Detailed Explanation
📖How It Works
Opening and Unpacking ZIP Archives in Your Browser
ZIP Extractor opens a .zip archive, lists everything packed inside it and decompresses the parts you want — all without uploading a single byte. Drop a .zip onto the page or click to pick one, and the tool reads the archive’s central directory instantly and renders a searchable, collapsible file tree showing each entry’s size, date, a per-extension file colour and a lock icon on encrypted members, plus a stats bar with the file and folder counts and the compressed-to-uncompressed size. Click a text or image file to preview it in a modal before extracting anything, tick individual files or whole folders, and extract: one file downloads directly while several are repackaged locally into a single ZIP with a progress bar. Because so many formats are ZIP containers, it also opens .jar, .apk, .docx, .xlsx, .pptx, .odt, .epub and browser-extension packages.
Opens and browses ZIP archives in the browser — no upload and no WinZip or 7-Zip install
Searchable, collapsible file tree with sizes, dates, file colours and a lock icon on encrypted entries
Preview text and images inside the page before extracting
Grabbing One File, Peeking Inside a Package, or Extracting Everything
The everyday job is pulling files out of a ZIP without installing an archiver: extract a whole download, or grab just the one document, image or source file you actually need from a large archive using the per-row download button or a selective extract. Because .docx, .xlsx, .pptx, .epub, .jar and .apk are ZIP containers, the same tool lets you look inside a Word or Excel document, an e-book or an Android app package to inspect its XML, assets or manifest. Developers use it to peek at a build artifact, designers to fish a single asset out of a hand-off ZIP, and anyone on a locked-down or mobile device to open an archive when no desktop unzip tool is available. The inline preview means you can confirm a file is the right one before saving it.
Extract everything, or grab a single file with the per-row download button
Selectively extract chosen files or whole folders into one repackaged ZIP
Look inside .docx, .xlsx, .pptx, .epub, .jar and .apk packages
Works on locked-down or mobile devices with no desktop archiver installed
🔧Technical Details
How the ZIP Reader Works
The archive is opened with the zip.js library, which reads the ZIP central directory from a BlobReader over the local File object and returns each entry’s filename, compressed and uncompressed sizes, last-modified date and encryption flag — a metadata scan that never touches the compressed data. Those entries are normalised (leaf name, forward-slash path, size, date, encrypted) and folded into a directory tree for the UI. Reading a file is lazy: only when you preview, download or extract an entry does zip.js DEFLATE-decompress that member into a Blob, text string or byte array via a TextWriter, BlobWriter or Uint8ArrayWriter. If zip.js rejects an unusual archive, the tool falls back to loading it with JSZip. Selective extraction of several files repackages them with JSZip using STORE (no re-compression), so the output is fast and lossless, and ZIP64 support lifts the classic 4 GB / 65,535-entry limits.
zip.js reads the central directory over a BlobReader; listing is metadata-only
Entries are DEFLATE-decompressed lazily — only when previewed, downloaded or extracted
JSZip is a fallback reader and repackages multi-file extractions with STORE (no re-compression)
ZIP64 support handles archives beyond the 4 GB and 65,535-file limits
⚙️Methodology
Password-Protected and Encrypted Archives
When an archive contains encrypted entries the tool marks them with a lock icon and shows an inline password field. It handles the modern WinZip AES-256 and AES-128 schemes as well as the weak legacy ZipCrypto method: the password you type is handed only to the local zip.js decryption engine, which derives the key and decrypts each member on your device as you preview or extract it. The password is never transmitted, logged or stored, and closing the tab discards it. A wrong password produces a clear error rather than a corrupt file, so you can simply try again. Note that there is no password-recovery or brute-force feature — against real AES encryption the only route to a forgotten password is to obtain it from whoever created the archive.
Opens WinZip AES-256, AES-128 and legacy ZipCrypto encrypted archives
The password is used only locally by zip.js and is never transmitted or stored
A wrong password is reported clearly instead of producing a corrupt file
No password recovery or cracking — a forgotten AES password cannot be brute-forced here
⚠️Limitations
Honest Limitations
Everything runs in browser memory, so the archive and the files you extract must fit in RAM: there is a soft 4 GB cap and very large archives are bounded by your device. It is a ZIP-family tool — it opens .zip, .zipx and the many ZIP-container formats, but it is not a RAR or 7z extractor, which use different compression. In-page previews are limited to text and images under about 2 MB; larger or binary files are offered as a download instead. The tool extracts existing archives but does not create new ZIPs, and it reads rather than modifies them. For encrypted archives the correct password is required, and there is deliberately no password-cracking path. When an entry is opened with the JSZip fallback, some metadata such as the uncompressed size may show as zero until the file is actually read.
In-memory processing with a soft 4 GB cap; large archives are bounded by device RAM
ZIP-family only — not a RAR or 7z extractor
Inline preview covers text and images under about 2 MB; other files download instead
Extracts existing archives; it does not create or modify ZIPs
🔒Privacy & Security
Privacy: Your Archive Never Leaves the Tab
ZIP archives routinely hold sensitive material — document bundles, source code, database dumps, personal photos, encrypted backups — and this tool is built so none of it leaves your machine. The .zip is read with the browser File API and its central directory parsed, previewed and decompressed entirely in browser memory with the zip.js and JSZip libraries; there is no server, upload, database, logging, API or CDN anywhere in the processing path, and even the repackaged extract is built on your device. Passwords for encrypted archives are handed only to the local decryption engine and are never transmitted. The tool works offline once cached, and closing the tab discards every byte. There is no login and no telemetry, and the only optional network use anywhere on the site is consent-gated advertising, which never sees your files.
Archive read, parsed, previewed and decompressed entirely in the browser
No server, upload, database, API or CDN in the processing path
Passwords are used only locally and never transmitted
Works offline once cached; closing the tab discards everything
ZIP Extractor — formats, capabilities and limits
Capability
Support
Notes
Formats
ZIP, ZIPX and ZIP containers
Also opens .jar, .apk, .docx, .xlsx, .pptx, .odt, .epub, .xpi and .crx
Listing
Instant central-directory scan
Searchable, collapsible tree with sizes, dates, file colours and encryption flags; metadata only
Preview
Text and images in a modal
Files under about 2 MB; larger or binary entries download instead
Extraction
Single file or selective
One file downloads directly; many are repackaged locally with JSZip using STORE (no re-compression)
Encryption
AES-256, AES-128 and ZipCrypto
Password prompted and used locally; never transmitted; wrong passwords reported
Limits & scale
ZIP64 up to a soft 4 GB
Bounded by device RAM; ZIP-family read-only, no RAR/7z; 100% client-side, no upload
ZIP Extractor opens ZIP archives in the browser: zip.js reads the central directory into a searchable, collapsible tree (with JSZip as a fallback), text and image entries preview inline, and files extract individually or selectively — one download directly, many repackaged locally with STORE. It opens ZIP-container formats (.jar, .apk, .docx, .xlsx, .pptx, .epub and more), decrypts WinZip AES-256/AES-128 and legacy ZipCrypto archives with an on-device password, and supports ZIP64 up to a soft 4 GB. Everything runs in memory; nothing is uploaded.
