About this tool
ZIP compression is useful when you want to package several files into one attachment or archive. This tool uses browser file APIs and ZIP compression directly, so the selected files stay in the current page memory and are not uploaded.
ZIP and RAR are different archive formats. ZIP creation is open, broadly compatible, and practical in browsers; RAR creation has licensing and library ecosystem constraints that make it a poor fit for a local web tool, so this tool exports .zip only.
How to use it
Choose files
Click the upload area or drag several files onto the page. File names are kept inside the ZIP, and duplicate names are renamed to avoid overwriting.
Adjust output
Confirm the output filename and choose a compression level. Higher levels often save more space but take longer.
Create the ZIP
Click the compression button and the page reads the files locally, producing a ZIP Blob without a network upload.
Download the archive
Download the .zip file and verify it with your system unzip tool or another archive app.
Supported range and limits
- Processing location
- Browser local
- Output format
- .zip
- RAR support
- Creating .rar is not supported
- Compression level
- 0 to 9, default 6
- File types
- Any local file the browser can read
- Path handling
- Filters empty, current-directory, and parent-directory path segments; duplicate names are renamed
When you would use it
Sending grouped attachments
Package documents, images, or assets into one ZIP so email and form uploads are easier to manage.
Temporary project archiving
Compress a delivery set into one archive while preserving the original file names for storage or transfer.
Private file packaging
Because files do not leave the browser, the workflow is suitable for IDs, contract drafts, and internal material you do not want to upload to a third-party service.
What to know before you start
- ZIP may not shrink already-compressed formats very much. JPG, PNG, MP4, PDF, DOCX, and XLSX usually contain compression already, so the archive can be close to the original total size.
- Large files consume browser memory. Hundreds of MB or many files at once may be slow or fail on low-memory devices.
- This tool creates ZIP files, not RAR files. A later extraction tool can support ZIP reading and separately evaluate read-only RAR support.
Related concepts
- ZIP
- An open and widely compatible archive format that can package files and compress their contents losslessly.
- RAR
- A separate archive format with common extraction support, but creation constraints that make it unsuitable as a browser-local output here.
- Lossless compression
- A compression method where decompression restores the original bytes, useful for archives, text, and code.