Create ZIP File Online Free — Drag, Drop & Download
Need to bundle multiple files into a single archive for email, file sharing, or backup? FastZip creates a ZIP file directly in your browser — drag in your files, click download, and you have a ready-to-share .zip file. No software install, no cloud service, no privacy compromise.
How it works — Click the "Create ZIP" action, then drag and drop files (or click to browse). FastZip packages all of your files into a ZIP archive using the DEFLATE compression algorithm at a balanced compression level. The ZIP is assembled entirely in your browser using WebAssembly — your files never leave your device.
What you can ZIP — Any type of file, including documents, images, videos, code files, spreadsheets, or any binary data. FastZip doesn't restrict file types. The only limit is the total output size: free users can create ZIPs up to 100 MB total output size.
Why ZIP instead of RAR or 7Z? — ZIP is universally supported. Windows 11, macOS, iOS, and Android all open ZIP files without any additional software. If you're sharing with anyone who isn't technically savvy, ZIP is always the safest choice.
Compression level — FastZip uses DEFLATE compression level 6, which balances speed and compression ratio well. Files that are already compressed (JPEGs, MP4s, PDFs) won't shrink much further — that's expected. Text files, source code, CSV data, and uncompressed BMP or TIFF images compress significantly.
Format & Feature Reference
| File Type | Typical Compression | Notes |
|---|---|---|
| Text / source code | 60–80% reduction | Compresses very well |
| CSV / JSON data | 50–75% reduction | Highly repetitive data |
| Office docs (.docx, .xlsx) | 5–20% reduction | Already internally compressed |
| JPEG images | 0–3% reduction | Already compressed — no benefit |
| MP4 / video | 0–2% reduction | Already compressed |
| PNG images | 5–15% reduction | Some room for deflate |
| Executable binaries | 30–50% reduction | Machine code compresses well |
Creating a ZIP for Email Attachments
Most email providers limit attachment size to 10–25 MB and many block specific file extensions (.exe, .bat, .js). ZIPping files solves both problems: it reduces total size and bundles everything into one attachment the recipient can open on any device.
Gmail, Outlook, Apple Mail, and Yahoo all accept ZIP attachments. If your ZIP exceeds the email limit, consider using a file sharing service or breaking the ZIP into smaller parts.
Creating a ZIP for Website Upload
Many content management systems and hosting control panels accept ZIP files for bulk upload — Wordpress, cPanel, Shopify theme uploads, and most FTP alternatives. FastZip is useful here because you can bundle your theme files, media assets, or configuration files into one ZIP on any device and upload that.
The ZIP that FastZip creates is a standard ZIP compatible with all hosting tools. Folder structure is preserved, so if you're uploading a theme with subfolders (css/, js/, images/), they'll appear correctly after upload.
Creating a ZIP on Mobile Devices
Creating ZIPs on Android and iOS has historically required dedicated apps. FastZip runs in your mobile browser — Chrome on Android, Safari on iOS — without any app install.
On Android, the Files app or Downloads app can then be used to share or send the resulting ZIP. On iOS, downloaded ZIPs land in the Files app and can be shared via AirDrop, iMessage, or any other share sheet option.