Create a ZIP file

1. Choose files or drop several files onto the area above. “Add folder” takes a folder with its structure.
2. Check the list with the sizes and remove files that do not belong.
3. Give the archive a name. In the advanced settings you can switch compression off.
4. Choose “Create ZIP” and download the finished file.

Your browser reads every file, compresses it with the Deflate method built into the browser and writes a ZIP archive in the usual standard. File names are stored as UTF-8, so umlauts and other special characters survive. Every file gets a CRC-32 checksum. It exists to detect damage and is not a security feature.

After writing, the tool reads the archive again and compares names, sizes and checksums with the originals. Only then is the download offered.

Browsers offer no adjustable compression levels. That is why there are two choices: compress files where that makes them smaller, or store everything uncompressed. Images such as JPG or PNG, videos and files that are already packed hardly shrink and are stored as they are. The page shows the original size and the archive size. A saving is only stated when there is one; for very small or already compressed files the ZIP can even be slightly larger.

Identical file names are numbered (“Report (2).pdf”) so nothing is overwritten. Unsafe paths are cleaned. The archive carries a fixed, neutral timestamp, so it does not reveal when your files were made.

A ZIP file can hold up to 10,000 files and 600 MB together, less on smartphones and devices with little memory (250 MB). The tool offers no password protection or encryption. Dropping a whole folder onto the area is not supported; use “Add folder” if your browser offers it.