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Compress Files Online — Maximum ZIP Level

Pack any files into a single ZIP archive with your chosen compression level, entirely in the browser.

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Drag & drop files here or click to select

You can add more files in several rounds; duplicates get a numbered suffix.

Processing... 0%
Reading input files
Compressing data
Assembling ZIP structure
Finalizing archive

Result

This page opens the ZIP creator with compression level 9 — the maximum — already selected: add your files, press the button and get the smallest ZIP the format can produce.

An honest expectation check: maximum compression works wonders on text, CSV, logs, source code and uncompressed images, but files that are already compressed — jpg, png, mp4, mp3, docx, xlsx — will barely shrink at all, because their data is compressed once already. The tool shows the real size reduction after creation, so you see exactly what level 9 achieved instead of a marketing promise.

Compression happens locally in your browser: nothing is uploaded, and the resulting archive downloads straight from your own device's memory.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • Multi-file upload with drag & drop, folder structure preserved via relative names.
  • Compression level select: 0 (store), 6 (default), 9 (maximum).
  • Shows the compression ratio achieved after the archive is created.

Key Benefits

✓ Complete privacy: files are compressed locally in your browser and never uploaded to any server.
✓ Real compression control: store only, balanced or maximum level — with the actual size saving shown after creation.
✓ Add files in several rounds and remove any of them from the list before the archive is built.

Use Cases

  • • Need to email a folder of documents as a single attachment instead of a dozen files?
  • • Want to shrink logs, CSV exports or source code before uploading them somewhere with a size limit?
  • • Handing over a project and want one tidy archive with the folder structure preserved?