In-memory processing
Create ZIP runs as JavaScript inside this tab.
Never uploaded
Safe for financials, contracts and NDAs.
No caps or sign-ups
File size is limited only by device memory.
Create a ZIP file to send many files as one attachment or download, or to keep related files together. The archive is built in your browser, so the files are never uploaded.
Also known as Zip files.
No. Files that are already compressed, such as JPG, MP4 and ZIP, are stored as they are, because compressing them again would waste time without saving space. Other files use standard DEFLATE compression.
Yes. Create ZIP runs entirely inside your web browser using JavaScript, so the file never leaves your device. It is safe for confidential documents such as contracts, financial records and IDs.
There is no fixed limit, because the file is processed on your own device. Very large files depend on your device's available memory; a modern laptop or phone handles hundreds of megabytes.
Yes. ZapConvert runs in any modern browser, including Safari on iPhone and iPad and Chrome on Android, with nothing to install. You can add several files at once and download them together as a ZIP.