Select files to compress
Drag & drop multiple files or click to browse
We use the **JSZip Engine** to bundle your files locally. Your data is compressed entirely within the secure browser sandbox—no uploads, no tracking, just fast results.
Archive Settings
Finalize your ZIP bundle.
File Queue
Bundling files: 0%
What is the File Compression Tool?
The File Compression Tool is a client-side archiving utility designed to bundle multiple files into a single, standardized ZIP archive. By adding files directly to the upload queue, the tool aggregates your data and triggers a local download of the compressed package.
This utility relies on the JSZip library to compile your files inside your browser tab. Because the compression process takes place entirely in browser RAM, your files are never transmitted to external servers, protecting your sensitive PDF documents, images, and source code files from exposure.
How to Use the File Compression Tool
- Select Your Files: Drag and drop your files into the dotted drop zone, or click the upload area to select them using your browser's file picker.
- Audit the File List: Review the file queue table below the drop zone. It lists the names, sizes, and file types of all selected items, along with a running total of the raw size.
- Compile the ZIP: Click the "Compress & Download" button. The loading overlay will appear to show the bundling progress.
- Save the Archive: Once compilation completes, your browser will automatically download the newly created ZIP archive containing all your files under their original directory structure.
Key Features
- Multi-File Batch Bundling: Aggregate dozens of files of different formats (PDFs, images, logs, code) into a single ZIP archive.
- Interactive Queue Audit: View the name, size, and file type of each item in the compression list before building the archive.
- Client-Side Compilation: Leverages local JSZip libraries to bundle your data in browser memory.
- Original File Preservation: Compiles the ZIP archive without altering, renaming, or deleting your original files.
- Offline Functionality: Compile archives offline without needing an active network connection.
Common Use Cases
- Email Attachment Preparation: Group multiple documents, screenshots, and invoices into a single ZIP folder to simplify email threads.
- Research Log Archiving: Package sensitive research logs, Excel databases, or clinical records into organized folders.
- Code Project Packaging: Bundle source files, image assets, and configuration scripts into a single zip file for deployment or sharing.
- SD Card Backups: Consolidate photo batches or media assets from memory cards into structured zip archives.
Frequently Asked Questions
For the best performance, we recommend zipping files in batches under 150-200MB. Larger folders may exceed browser memory allocations and cause the tab to freeze or crash during compilation.
This web-based tool compiles standard, unencrypted ZIP files. For secure AES password encryption, we recommend using dedicated desktop software after downloading your compiled ZIP folder.
No. 99tool.in processes all file bundling locally. Your files are read into local browser RAM, structured into a ZIP, and downloaded directly to your device without leaving your system.
No. ZIP uses lossless compression algorithms. Extracting files from the downloaded ZIP folder will restore them in their original byte-for-byte condition with no quality loss.
Yes. If your browser supports folder uploads, dragging a directory will import all contained files while preserving their subfolder paths inside the output ZIP.
🔒 Privacy & Data Note: File compression and ZIP compilation happen locally in your browser. No file contents or metadata are sent to our servers.