Zip Creator
Make ZIP archives.
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What is a ZIP archive?
ZIP, created by Phil Katz in 1989, is both a container and a compression format. It bundles many files and folders into one, preserving the directory structure, and compresses each entry individually — usually with the DEFLATE algorithm — which is why you can extract a single file from a large archive without decompressing everything.
How much you gain depends entirely on the content. Text, code, spreadsheets, and logs compress dramatically, often to a fifth of their size, because they are full of repetition. JPEG photos, MP4 video, MP3 audio, and PDFs with embedded images are already compressed, so zipping them saves almost nothing — the value there is bundling, not size. Note also that a standard ZIP's file listing is readable without the password even when entries are encrypted.
Why we built this tool
Archiving is how people send a folder as one attachment, package a project for handover, bundle a set of documents for an application, or keep a tidy backup of something finished.
Those bundles are exactly the material you would rather not upload: whole project folders, client deliverables, personal document collections. Free archiving sites cap total size and require the entire set to be uploaded before anything happens. Ours builds the archive in your browser with a JavaScript ZIP implementation, so the files are read from disk, compressed on your device, and written straight back out as a single archive. No upload, no size limit, no account.
Tips and common mistakes
- Already-compressed content such as JPEG, MP4, and MP3 barely shrinks; you are bundling, not compressing.
- Text, code, and spreadsheets often compress to a fifth of their size.
- A standard ZIP's file listing is readable even when entries are password-protected.
- Use real encryption rather than a ZIP password for anything genuinely confidential.
Quick start: using Zip Creator
- Add the files and folders you want to bundle.
- Check the list — everything included will be in the archive.
- Create the archive and watch the compression ratio reported.
- Download the ZIP file.
- Extract it once to confirm the structure is what you expected before sending it on.
Open archives with ZIP Extractor, and protect sensitive bundles using Encrypt File rather than relying on ZIP passwords.