ZIP Compressor Online — Create ZIP Files Free
Compress multiple files into a ZIP archive right in your browser. Adjust the compression level, then download your archive instantly. Runs entirely in your browser — no uploads, no account needed.
Drop files here or click to browse
Select multiple files to compress into a ZIP archive
How ZIP Compression Works
- 1Drop your files onto the dropzone or click Browse to select them.
- 2Choose a compression level — Balanced is the best default for most use cases.
- 3Click Create ZIP. The browser compresses all files in memory using the DEFLATE algorithm.
- 4Click Download to save
archive.zipto your device.
ZIP vs Other Archive Formats
ZIP is the most universally supported format — every operating system can open it without extra software. TAR is preferred on Linux/macOS for preserving permissions. 7z offers the best compression ratio. For everyday file sharing, ZIP is almost always the right choice.
Tips for Better ZIP Archives
Skip already-compressed files
JPEG, MP4, and PDF files are already compressed. Use "Store" level for these to avoid wasted CPU time with minimal size gain.
Use Maximum for text
Source code, logs, and CSV files compress extremely well. Maximum level can reduce their size by 80–90% with only a slight speed cost.
Name your output file
The download is named archive.zip. Rename it immediately after downloading to keep your files organised.
Large batches
For hundreds of small files, ZIP can be slower than 7z due to per-file overhead. Use the 7z tool for large batches where maximum compression matters.
Frequently Asked Questions
Are my files sent to any server?
No. All compression runs locally in your browser using the fflate library compiled to JavaScript. Your files never leave your device.
What compression levels are available?
Four levels: Store (no compression, fastest), Fast (light compression), Balanced (default, good size/speed ratio), and Maximum (smallest output, slowest).
How many files can I add to one ZIP?
There is no hard limit in the tool, but very large total sizes (multi-gigabyte) may hit browser memory limits. For everyday use, hundreds of files work fine.
Can I add folders?
The browser file picker does not expose folder structure, so each file is added at the root level of the ZIP. For folder-preserving archives consider the TAR tool.
What is the maximum file size?
Limited only by your browser tab's available memory — typically 1–2 GB per tab on modern devices. There is no server-side limit because everything runs locally.
Is the ZIP compatible with Windows, Mac, and Linux?
Yes. The output uses the standard ZIP format (DEFLATE compression, ZIP64 when needed) which is natively supported on all major operating systems.