CalConverters

Create ZIP

Drop multiple files to combine them into a single .zip archive, choosing Deflate (smaller) or Store (no compression). The ZIP is built entirely in your browser — nothing is ever uploaded.

Files never leave your device

Drop files to add to a ZIP, or click to browse

What This Tool Does

This tool bundles multiple files into a single downloadable .zip archive, right in your browser. Drop as many files as you like, choose Deflate (smaller output) or Store (no compression), and download the result — no software to install, and nothing you drop is ever uploaded.

Deflate vs. Store

MethodWhat it doesBest for
DeflateCompresses each file while packing itText, documents, spreadsheets, uncompressed images — most everyday files
StorePacks files exactly as-is, no compressionFiles that are already compressed: JPEGs, MP4s, MP3s, or other ZIPs
Tip: Compressing an already-compressed file almost never shrinks it further and just spends CPU time for nothing — pick Store for a folder of photos or videos, and Deflate for everything else.

Building Your ZIP

Files are packed in the order you dropped them, and you can remove any file from the queue before creating the archive. If two files share the same name, the tool automatically renames the later one by inserting a number before its extension — like photo (2).jpg — so nothing inside the ZIP silently overwrites another entry.

What This Tool Doesn't Do

This tool builds a plain ZIP with Deflate or Store compression only. It doesn't produce a 7z archive, and it has no option to password-protect or encrypt the ZIP it creates. If you need to open a password-protected ZIP or 7z archive someone sent you, Extract Archive supports both.

Is There a File Size Limit?

No hard limit — the archive is assembled entirely in your browser's memory, so the real ceiling is how much RAM your device has available. A heads-up appears once your combined files pass roughly 100 MB, since very large batches take longer to zip.

Your Files Never Leave Your Device

Every file you drop is read and packed locally by a small WebAssembly module running in your browser tab. Nothing is sent over the network at any point — closing the tab discards everything, since there was never a server involved.

Want to check what's inside the ZIP you just built, or open one someone sent you? Use Extract Archive. Need to shrink a single large file instead of bundling several? See Compress a file. To confirm a download's integrity before trusting it, see the Hash checker.

Frequently asked questions

Can I create a ZIP file without installing any software?
Yes. Drop as many files as you like onto this tool, pick Deflate or Store, and download a single .zip built from them — no app, extension, or account needed. It works the same way on desktop or mobile, in any modern browser.
What's the difference between Deflate and Store?
Deflate compresses each file as it's packed into the ZIP, which usually produces a smaller archive at the cost of some processing time. Store packs files exactly as-is with zero compression, which is faster and, for files that are already compressed, produces the same size as Deflate would anyway.
When should I use Store instead of Deflate?
Use Store for files that are already compressed — JPEGs, MP4s, MP3s, or other ZIP files. Running Deflate on those rarely shrinks them further and just spends CPU time for no benefit. Deflate is the better default for text, documents, uncompressed images, and most everyday files.
Can this tool create a 7z archive or a password-protected ZIP?
No. This tool builds a plain ZIP using Deflate or Store compression only — there's no 7z output and no password/encryption option. If you need to open a password-protected ZIP or 7z archive someone sent you, use Extract Archive instead; it supports both.
Is there a size limit on the files I can zip?
No limit is imposed by this tool or a server — the ZIP is built entirely in your browser's memory, so the practical ceiling is how much RAM your device has available. A heads-up appears once your combined files pass roughly 100 MB.
Are my files uploaded anywhere to build the ZIP?
No. Every file you drop is read and packed locally using WebAssembly running in your browser tab. Nothing is sent over the network at any point, and closing the tab discards everything since there was never a server involved.
What order will my files be in inside the ZIP?
Files are packed in the order you added them, and you can remove any file from the list before creating the archive. Folder structure isn't recreated automatically — each dropped file becomes a top-level entry in the ZIP by its own filename.
What happens if two files I drop have the same name?
The tool automatically renames the duplicate by inserting a number before its extension — for example a second report.pdf becomes report (2).pdf — so nothing silently overwrites another file inside the resulting ZIP.