ZIP Creator & ZIP/RAR Extractor
Create ZIP archives, unzip ZIP files, and extract RAR archives directly in your browser. Large ZIPs can stream directly to disk on supported desktop browsers.
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Selected source files are processed locally in your browser.
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Extracted Contents
0 filesFree ZIP Creator and ZIP/RAR Extractor
The Utiliverse Archive Creator & Extractor focuses on the archive features that can be implemented reliably in a browser: creating ZIP archives, extracting ZIP files, and extracting RAR archives. ZIP creation uses the modern zip.js library, which is designed for large data, streaming, Zip64 archives, and browser file APIs. On compatible Chromium-based desktop browsers, the tool can write the ZIP directly to a file you choose instead of first building the entire archive as one large in-memory object.
RAR creation is not offered in this version. RAR is a proprietary archive format, and reliable browser-side creation is not available through the extraction engine used here. Existing RAR and RAR5 archives can still be opened and extracted. This separation keeps the tool's buttons aligned with what the underlying browser libraries can actually perform.
How to Create ZIP Files and Extract ZIP or RAR Archives
Create a ZIP archive
Choose the Create ZIP tab, then add individual files or select an entire folder. The archive-content list shows the relative paths that will be stored in the ZIP. Folder selection keeps directory structure, which is useful for project files, website folders, documents, backups, and other collections where subfolders matter.
Choose a ZIP filename and compression level. Store-only is fastest and is often sensible for DMG, JPEG, MP4, MP3, and other content that is already compressed. Normal compression is a good general default for mixed files. Maximum compression can take much longer and usually provides limited additional savings on already-compressed source files.
Large ZIP files and direct-to-disk mode
The tool evaluates the combined source size before creation. Under 250 MB is treated as a normal browser workload. From 250 MB through 1 GB, the page recommends a desktop browser and direct-to-disk mode. Over 1 GB is labeled very large because browser, filesystem, memory, and device limits become increasingly important.
If the browser supports the File System Access API, selecting Create ZIP opens a Save dialog first. The ZIP is then written incrementally to that file while each source file is read, which avoids keeping the complete finished ZIP in page memory. This is the preferred path for a file such as a 735 MB DMG. If direct disk writing is unavailable, the tool falls back to building a downloadable Blob; that fallback can still fail with large inputs because the browser must retain more data in memory.
Why a large DMG may not become much smaller
Disk images often contain data that is already compressed. ZIP can still package the DMG successfully, but compression may provide little size reduction. For a large DMG, Store-only or Fast compression can save time and CPU usage. The purpose of ZIP in that case may be packaging, checksum-friendly transfer, or compatibility rather than substantial compression.
Extract a ZIP or RAR archive
Choose the Extract Archive tab and select a .zip or .rar file. ZIP extraction uses zip.js, while RAR extraction uses the browser RAR engine. For password-protected RAR archives, enter the password before extraction. Stored archive paths are normalized before output to prevent parent-directory traversal through entries such as ../file.
Extracted items can be downloaded individually. On browsers supporting direct folder access, Save to Folder recreates subdirectories inside a folder you choose. Extraction still requires browser resources for the extracted data, so extremely large archives can be more demanding than simply creating a streamed ZIP.
Privacy and browser limits
The source files you select are not sent to a Utiliverse upload endpoint. Compression and extraction run in your browser. The page does load its JavaScript/WebAssembly archive libraries from public CDNs. Direct-to-disk ZIP creation is the lowest-memory path available in this browser tool, but no browser-based utility can guarantee an unlimited file size: available RAM, storage space, browser limits, filesystem limits, and device performance still apply.
Archive Tool FAQ
Can this tool create RAR files?
No. This version creates ZIP files and extracts ZIP or RAR archives. RAR creation was removed because the browser extraction engine does not provide a dependable RAR-writing path.
Can it create a ZIP from a 735 MB DMG?
On a compatible Chromium-based desktop browser, the direct-to-disk ZIP path is designed to handle large inputs more reliably because the finished ZIP is streamed to the chosen file instead of being assembled completely in page memory. Actual success still depends on free disk space, browser limits, device resources, and the source file.
What size warning does the tool use?
Under 250 MB is shown as a normal workload, 250 MB through 1 GB is marked large with a recommendation to use a desktop browser and direct-to-disk mode, and more than 1 GB is marked very large and device dependent.
Can it unzip ZIP files?
Yes. Select a ZIP archive in Extract Archive mode to read and extract its files directly in the browser.
Can it unrar RAR files?
Yes. RAR and RAR5 archives can be opened and extracted in the browser, including password-protected RAR files when the correct password is supplied.
Are my source files uploaded?
No. Selected source files and archives are processed locally by the browser-side archive libraries rather than uploaded to a Utiliverse server.
Can I preserve folders inside a ZIP?
Yes. Folder selection preserves relative paths during ZIP creation, and Save to Folder can recreate extracted subfolders on supported browsers.
Why can very large extraction still fail?
Extraction may hold one or more decompressed files in browser-managed memory before they are downloaded or saved. Very large archives can therefore exceed the memory available to the tab even though ZIP creation can stream directly to disk.