ZIP Extractor - Open ZIP Files in Your Browser
Open a .zip archive, browse its contents, preview text files and images, and download individual files. Everything happens locally in your browser - the archive is never uploaded.
ZIP Extractor - Unzip Files Without Installing Anything
Open any standard .zip archive directly in your browser: see every file with its original and compressed size, preview text files and images without extracting, download individual files, or pull everything out with one click. There is no upload step and no server involved; the archive stays on your machine from start to finish.
This is handy whenever you receive a ZIP on a locked-down work machine without archive software, want to peek inside a download before trusting it, need one file out of a large archive, or are on a tablet or Chromebook where desktop unzip tools are unavailable. Developers use it to inspect build artifacts, exported backups, and package contents without cluttering their disk with extracted folders.
Under the hood the tool reads the ZIP format the same way a desktop archiver does: it locates the end-of-central-directory record at the tail of the file, walks the central directory headers to list every entry, then follows each local file header to the compressed data. Stored entries are copied out directly and deflate-compressed entries are decompressed with the browser's native DecompressionStream API, which is why no third-party library is needed.
The reader supports the classic ZIP format, which covers archives and files up to 4 GB. ZIP64 archives (used beyond that limit) are detected and reported clearly rather than producing garbage, and password-protected entries are listed but marked as encrypted, since ZIP encryption cannot be handled safely client-side. Text previews are limited to files under 1 MB to keep the page responsive.
Because extraction is local, it is safe for sensitive documents that should not touch a third-party server. After extracting, you can inspect JSON files with our JSON Formatter or convert extracted Markdown using the Markdown to HTML tool.
How the ZIP Extractor Works
- 01Choose a .zip file; it is read locally and never uploaded.
- 02The tool parses the ZIP central directory to list every file with its size and compressed size.
- 03Preview text files and images inline, or download individual files - deflate entries are decompressed natively in the browser.
- 04Use Download all to extract every supported file sequentially.
Inspecting and Extracting ZIP Archives in the Browser
Select the archive and the file table appears instantly, because listing only requires reading the central directory at the end of the file, not decompressing anything. Folders show with a folder icon, and each real file displays its uncompressed and compressed sizes so you can spot the large items before extracting. Click Preview on any text file under 1 MB - source code, JSON, CSV, logs, configuration - to read it inline, or on an image to render it directly from the decompressed bytes. Download extracts just that file: stored entries are copied out as-is and deflate entries run through the browser's native decompressor, so even large files extract quickly. Download all walks the archive sequentially with a short pause between files so the browser accepts every download; depending on your settings the browser may ask once for permission to download multiple files. Encrypted entries are listed but clearly marked as unsupported, since ZIP passwords cannot be handled safely client-side, and ZIP64 archives (beyond 4 GB) are detected and reported with an explicit message instead of failing silently.
When to Use the ZIP Extractor
Use it whenever installing archive software is impossible or overkill: locked-down corporate machines, tablets and Chromebooks, or a quick look inside an email attachment before trusting it. It is ideal for pulling one file out of a big archive without extracting the rest, and for checking what a build artifact or exported backup actually contains. For archives over 4 GB, password-protected ZIPs, or formats like RAR and 7z, you will still need a desktop tool.
Common Use Cases
- Opening a ZIP attachment on a machine without archive software installed
- Peeking inside a downloaded archive before extracting it to disk
- Pulling a single document out of a large backup archive
- Inspecting build artifacts and exported data packages during development
- Formatting extracted JSON files for reading JSON Formatter & Validator - Instant Results
- Converting extracted Markdown files to HTML Markdown to HTML Converter - Live Preview
Expert Tips
- Preview before you download: reading a suspicious file inline is safer than saving it to disk where a double-click could execute it.
- If Download all only saves the first file, allow multiple downloads for this site when the browser asks - it is a one-time permission.
- Very large archives load fully into memory; for multi-gigabyte ZIPs, a desktop archiver remains the better tool.
Frequently Asked Questions
- No. The file is read with the browser's FileReader API and parsed locally with JavaScript. Listing, previewing, and extracting all happen on your machine, which also makes the tool safe for confidential archives.
- ZIP64 is an extension used when an archive or a file inside it exceeds 4 GB, or when there are more than 65,535 entries. The tool detects the ZIP64 markers and tells you explicitly rather than misreading the archive. Use a desktop archiver for those.
- No. Encrypted entries are listed with their names and sizes but marked as not supported. Legacy ZIP encryption is weak and modern AES-ZIP requires key derivation that is out of scope for a safe in-browser tool.
- Stored (no compression) and deflate, which together cover the overwhelming majority of ZIPs created by Windows, macOS, and standard tools. Exotic methods like bzip2 or LZMA inside ZIP show a clear error for that entry only.
Is my ZIP file uploaded to a server?→
Why does it say ZIP64 not supported?→
Can it open password-protected ZIPs?→
Which compression methods are supported?→
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