Ordinary file work does not always require a remote server.
ZeroUpload explores what a browser can do directly for common conversion, compression, editing, PDF, audio, OCR, and image tasks.
BOUNDARY
ZEROUPLOAD
A file tool built around a rule: when useful processing can happen on the device, the file should not need to leave it.
A REAL OPERATION
Try the rule instead of reading about it.
DEVICE SIDE
JPEG, PNG, or WebP under 25 MB. The demo resizes only when needed and encodes a WebP result in this tab.
OUTSIDE
Nothing from this demo needs to cross.
This demonstration processes the selected image in your browser. The demo does not send the file to a server.
Keep the boundary meaningful.
The product is designed around local processing where the supported browser operation can genuinely be performed on-device.
Local does not mean limitless.
Practical file sizes, speed, memory use, and supported operations still depend on the visitor's browser and device.