Privacy on StackImage

StackImage is built around a simple promise: your images stay on your device. Tools run in the browser with client-side libraries. We do not operate an upload API for tool processing.

Files and processing

When you use a tool, selected files are read locally by your browser. Processing happens in memory on your computer. Downloads are generated locally. We do not receive the pixels of your photos.

Local storage on your device

To make working across tools convenient, two things are stored locally in your browser — never on a server:

• Recent jobs — A metadata-only list (file name, size, tool, time) kept in localStorage. File contents are never stored there.
• Hand-off files — When you send a result to another tool, the file is held in memory and mirrored to IndexedDB so a refresh does not lose it. At most 12 files are kept; older ones are evicted automatically.

You can wipe both at any time:

Clear all local StackImage data

On-device models

Remove Background and Upscale download model files from our storage (R2) on first use. Those requests do not include your photos. Both use WebGPU when the browser has it, otherwise WASM.

Accounts

StackImage does not require an account to use tools.

Website analytics

This site uses Google Analytics 4 to record page views, referrers, and device type. It uses a first-party cookie. Google advertising signals are off. Tool file contents are never sent.

Sister apps

StackPDF is a separate Stack Tools site for documents. Files are not shared between StackImage and StackPDF — each origin keeps its own local data. Read StackPDF’s privacy page.

Contact

For privacy questions about StackImage, email contact@stacktools.studio.