What it does
- Crop to a ratio or freehand, with rule-of-thirds guides
- Straighten a crooked horizon by dragging
- Brightness, contrast, saturation, shadows and highlights
- Levels, against a histogram that updates as you drag
- Twelve presets, previewed on your photo before you commit
- Undo and redo every step, back to the original
Why it works with the network off
The editing itself is Rust compiled to WebAssembly, running in a worker thread in your browser. That is the whole pipeline — decode, edit, re-encode — so there is no server in the loop to be slow or to be down. The first load fetches the engine; after that the tab is the editor.
Your original is kept
The file you opened is stored untouched in the browser's own database alongside the edit list. Reverting is not an undo stack running backwards, it is the original still being there. Closing the tab does not lose it, and clearing site data does.
No account needed
Every tool that runs on your own machine works logged out, with nothing to sign up for. Signing in adds sync across your devices and share links; Pro adds the passes that need a server. The no-upload page draws the line between the two, and Architecture shows it table by table.