ZIP Creator — Free Browser ZIP Builder
Drop any files, get a single .zip download. Optionally name a root folder to keep them organized inside the archive. Files never leave your device.
Use Cases
How to create a ZIP file in your browser
Drag files into the upload area, or click to browse and multi-select. Add as many files as you need — remove any before zipping.
Enter a folder name (e.g. "my-files") to nest everything inside one folder in the ZIP, or leave it blank for a flat archive.
Click Create ZIP. Files compress with standard DEFLATE compression directly in your browser — no upload, no server round-trip.
Click Download ZIP. See the size reduction versus the original total before you download.
Frequently Asked Questions
- Are my files uploaded?
- No. ZIP creation runs entirely in your browser. Files never leave your device.
- Is there a size limit?
- No hard limit. Browser memory caps it — typically a few GB works fine on modern laptops.
- Can I nest files inside a folder?
- Yes. Enter a root folder name before creating the ZIP and every file is nested inside that folder in the archive.
- Does it preserve subfolder structure?
- No — files are added as a flat list, optionally under a single root folder you name. For nested folder structures, use a desktop ZIP tool.
- How much will compression shrink files?
- Text files compress 60–90%. Already-compressed files (photos, videos, MP3s) compress only a few percent.
- Does it work on mobile?
- Yes on iOS Safari 14+ and Android Chrome. Touch-friendly drop zone.
Why ZIP barely shrinks photos, video, or MP3s
ZIP uses the DEFLATE algorithm, which finds repeated byte patterns and replaces them with shorter references. This tool applies a balanced, fixed DEFLATE setting to every file — so how much a file shrinks depends entirely on how much repetition it already contains, not on any setting you pick.
| File type | Why it compresses (or doesn't) | Typical size change | Best reason to ZIP it anyway |
|---|---|---|---|
| Text / logs / code | Lots of repeated bytes (whitespace, keywords, patterns) | ~60–75% smaller | Real space savings |
| Photos (JPG/PNG) | Already compressed by their own format | ~1–3% smaller | Bundling into one download, not shrinking |
| Video / MP3 | Already compressed by codec | ~1–3% smaller | Bundling into one download, not shrinking |
| Mixed project folder | Depends on the mix of the above | Varies | One clean download instead of dozens of files |
- Photos, video, and MP3s are already compressed by their own format, so DEFLATE finds almost no repeated patterns left to squeeze — zipping a folder of JPEGs "to save space" barely helps; zipping it is mainly useful to bundle files into one download.
- Files are zipped as a flat list (optionally under one named root folder) — there is no password protection here; for encrypted archives, use a desktop tool like 7-Zip or the built-in macOS Archive Utility with a password-protected format.
Related tools
More free, in-browser tools from the Documents & Utility set — every one runs locally, with no sign-up and no upload.