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Compress and archive files
File Compressor creates compressed archives (ZIP) from one or more files, reducing their total size for easier storage and faster transfer. You can select individual files or entire folders, choose compression levels, and optionally password-protect the archive — all within your browser with no server uploads. File compression is one of the most fundamental digital tasks. Sending multiple files via email typically requires combining them into a single archive. Uploading project assets to a client portal, backing up documents, or sharing a collection of photos all become more efficient when the files are bundled and compressed. This tool handles the core use cases without requiring any installed software. All compression is performed in-browser using the native Compression Streams API when available, with fallbacks for broader compatibility. The files you select are read into memory, compressed, and offered for download as a ZIP archive. Nothing is uploaded or stored externally.
Select one or more files using the file picker or drag and drop them onto the upload area. The tool displays the list of selected files with their individual sizes and a total uncompressed size. Choose a compression level: Store (no compression, just bundling), Normal (balanced speed and size), or Maximum (best compression, slower for large files). Optionally set a password to encrypt the ZIP archive using AES-256 encryption within the ZIP standard. Once configured, click Compress and the tool processes each file, bundles them into a ZIP archive, and prompts you to download the result. The download includes the original file structure with preserved filenames.
Email systems reject multiple large attachments individually but often accept a single compressed archive. Project handoffs require sending entire folders of assets that are easier to share as one file. Archiving old documents saves storage space when files are not needed regularly but cannot be deleted. File Compressor solves all these scenarios in one tool without requiring WinZip, 7-Zip, or any desktop installation.
compressing and bundling documents for email attachment to clients and colleagues
packaging project assets (images, fonts, mockups) into a single deliverable archive
combining project files and research materials for submission to online portals
creating ZIP archives of website assets for deployment or client handoff
A graphic designer needs to send 15 source files totaling 120 MB to a client. Compressing them into a single ZIP at Normal level reduces the size to 85 MB and bundles everything into one attachment that fits within the email system's limit.
An office manager compresses a year's worth of monthly reports into password-protected ZIP archives at Maximum compression, reducing 2.3 GB of PDFs to 680 MB for long-term cold storage.
The Zilita Team builds privacy-first browser tools that help teachers, students, developers, businesses, and creators work more efficiently without sacrificing data privacy.