Files
Need to bundle several files into one ZIP, or open a .zip someone sent you and grab the contents? This tool does both inside your browser, with nothing to install. In "Make a ZIP" mode, drag and drop (or pick) files to add them, then download them all as one .zip. The contents are deflate-compressed, so text and documents get smaller (files that don't shrink, like already-compressed images, are stored without compression to avoid waste). In "Extract a ZIP" mode, opening a .zip lists every file name and size inside, and you can save them one at a time or just the ones you need. ZIPs with garbled Japanese filenames are handled too: the tool detects whether each name is UTF-8 or Shift_JIS, so ZIPs made on Windows with Japanese names read correctly. Under the hood, building, compressing, and extracting the ZIP all run inside your browser in JavaScript (using the standard Compression/DecompressionStream). That means the files you pick and the contents you extract are never uploaded, stored, or sent to a server — safe for internal documents, customer data, or contracts you'd rather not run through a cloud ZIP site, and for workplaces where uploading externally is against policy. Note: password-protected (encrypted) ZIPs and files larger than 4GB are not supported. To merge several CSVs into one, see csv-merge; to strip metadata from images and get them back as a ZIP, see batch-exif-strip.
How to use
- Choose "Make a ZIP" or "Extract a ZIP" (no software to install).
- To make one, add files and click "Download ZIP"; to extract, open a .zip and its contents are listed.
- Save extracted files one by one, or just the ones you need. Nothing is uploaded anywhere.
FAQ
Are the files I pick or extract sent to a server?
No. Building, compressing, and extracting the ZIP all run on your device in JavaScript. Nothing is uploaded, stored, or transmitted, so it's safe for internal documents, customer data, or contracts you'd rather not run through a cloud ZIP site, and for workplaces that forbid uploading externally.
Can it extract ZIPs with garbled (non-UTF-8) filenames?
Yes. It detects whether each file name inside the ZIP is UTF-8 or Shift_JIS and decodes accordingly, so ZIPs created on Windows with Japanese filenames (which often appear garbled elsewhere) read correctly. You can review the names in the list before saving.
Does making a ZIP actually compress the files?
Files that compress well — text and documents — are shrunk with deflate compression. Files that don't shrink much, such as already-compressed images (JPEG/PNG) or video, are stored without compression to avoid wasting time on no gain.
Can it make or open password-protected (encrypted) ZIPs?
No. Creating and extracting password-protected (encrypted) ZIPs is not supported, and files larger than 4GB are not supported either. The tool focuses on making and extracting ordinary, unencrypted ZIPs.
Any related tools for bundling or processing files?
To merge several CSV files into one with aligned headers, use csv-merge. To strip Exif/location metadata from images and get them back as a ZIP, use batch-exif-strip. All of them run on your device and upload nothing.