Most ZipOnTheFly implementations in PHP use the ZipArchive class. To create the ZIP, PHP must hold a significant portion of the file data in memory. If the total size of requested files exceeds memory_limit (commonly set to 128M or 256M), PHP will abort the process, throwing this error.
Example: If memory_limit = 128M and users select 150MB of files, the error appears.
The error triggers when the cumulative size of all requested files exceeds a certain threshold. This threshold is not universal; it depends on your server’s configuration. The primary culprits are:
If you have access to the files via command line (e.g., through SSH), you can create a zip archive directly on the server:
zip -r largefile.zip /path/to/large/files
Then, you can download the largefile.zip for use.
By considering these options, you should be able to find a suitable workaround for the "total size of requested files is too large for ziponthefly" error.
The error message "total size of requested files is too large for zip-on-the-fly"
is a common server-side restriction used to prevent system crashes or "zip bombs" when a user tries to download massive amounts of data at once. This typically occurs on platforms like Internet Archive total size of requested files is too large for ziponthefly
when the selection exceeds the server's real-time compression capacity—often capped at for standard ZIP formats or specific service limits like Dropbox Community Immediate Workarounds
If you encounter this error, you can still get your files by changing how you download them:
"total size of requested files is too large for ziponthefly typically occurs when you attempt to download a massive collection of files (often exceeding 100 GB) from an online archive or repository that generates ZIP files in real-time Hacker News
To bypass this limit, you should use one of the following methods: Download Individual Files
: Instead of clicking "Download All" or the ZIP option, navigate to the "Show All"
file list and download the specific files you need one by one. Use a Command-Line Tool : For large collections (especially on the Internet Archive ), use a download manager like to fetch the directory contents without zipping them first. Download in Smaller Batches
: If the platform allows it, select only a subset of folders or files that total less than the "on-the-fly" limit (which varies by service but is often around 20 GB to 100 GB). Desktop Syncing : For services like , installing the desktop application and syncing the folder locally avoids the web-based ZIP generation limit entirely. Use Specialized Software Most ZipOnTheFly implementations in PHP use the ZipArchive
: If you are dealing with large individual archives already downloaded that won't open, use
, which handle ZIP64 extensions better than standard OS extraction tools. Internet Archive Are you trying to download from a specific site like the Internet Archive , or are you seeing this error in your own Information about size limits with WinZip
This error occurs when the total size of your selected files exceeds the server-side limits for "on-the-fly" ZIP generation. Many web services, including the Internet Archive and various SharePoint environments, set these thresholds (often around 2 GB, 10 GB, or 100 GB) to prevent server crashes and memory overloads caused by simultaneous large downloads. Guide: How to Bypass "Too Large for Zip-on-the-Fly" 1. Download Files Individually or in Chunks
Instead of zipping the entire directory at once, break the request down:
Select Subfolders: Select and download smaller batches of folders or files that fall within the service's limit.
Sequential Downloads: If the service provides a list view, download high-priority files individually. 2. Use Advanced Download Tools
For very large collections (e.g., 100 GB+), browser-based zipping often fails. Use command-line tools that handle raw file transfers without needing a ZIP wrapper: Then, you can download the largefile
Wget or Curl: Use these to fetch files directly from the server. For example, Internet Archive users often use wget to bypass ZIP generation.
Rclone: A robust tool designed for moving large datasets between cloud and local storage.
Dedicated Desktop Apps: Use official desktop clients (like Dropbox Transfer or OneDrive) which typically have much higher limits than web-based "on-the-fly" zipping. 3. Optimize Local Compression (For Uploaders)
If you are the one sending the files and hitting this limit, try these steps before sharing:
Reduce attachment size to send large files with Outlook - Microsoft Support
If you are the server administrator or have root access, you can adjust the configuration to allow larger zips.
1. Increase Memory Limit (PHP)
If the file manager runs via PHP (common in cPanel), the script may be hitting the memory_limit.
2. Adjust Web Server Timeout Even if memory is sufficient, the script might be timing out while zipping large files.
3. Use the Command Line (SSH) If you have SSH access, you can bypass the web file manager entirely. This is faster and has virtually no size limits.