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+# Resize & Rotate/Flip UX Redesign
+
+## Problem
+
+The before/after comparison slider is a poor fit for resize and rotate/flip tools:
+- **Resize** overlays two different-sized images — doesn't communicate anything useful. Users care about "how big will it be?" not pixel-level comparison.
+- **Rotate/Flip** transformations are self-evident. A slider adds nothing.
+
+The resize settings also use technical jargon (contain, cover, fill, inside, outside) that confuses layman users.
+
+## Design
+
+### Resize: Tab-Based Settings with Presets Front-and-Center
+
+Replace the current mode toggle (Pixels/Percentage) with three tabs:
+
+#### Presets Tab (default)
+- Grid of cards grouped by platform (Instagram, Twitter/X, Facebook, YouTube, LinkedIn)
+- Each card shows: platform icon, preset name (e.g., "Post", "Story", "Header"), dimensions (e.g., "1080 × 1080")
+- Clicking a card selects it (highlighted border), clicking again deselects
+- Selected preset populates the dimensions automatically
+- Process button at bottom
+
+#### Custom Size Tab
+- Width and Height number inputs
+- Aspect ratio lock toggle between them (link/unlink icon)
+- Fit mode as 3 plain-language options:
+  - "Crop to fit" (maps to sharp `cover`)
+  - "Fit inside" (maps to sharp `contain`)
+  - "Stretch" (maps to sharp `fill`)
+- Remove "inside" and "outside" fit modes — they confuse laymen
+- "Don't enlarge" checkbox
+- Process button at bottom
+
+#### Scale Tab
+- Percentage number input
+- Quick-select buttons: 25% | 50% | 75%
+- Process button at bottom
+
+### Resize: Side-by-Side Result Display
+
+Replace the before/after slider with side-by-side thumbnails:
+
+- Two image thumbnails side by side, each fitted within its half
+- **Left**: "Original" label, the original image, dimensions below (e.g., "3000 × 2000"), file size (e.g., "2.4 MB")
+- **Right**: "Resized" label, the processed image, new dimensions below (e.g., "1080 × 720"), file size (e.g., "340 KB")
+- File size savings shown between/below (e.g., "86% smaller")
+- Checkerboard background for transparency (same pattern as current viewer)
+- Review panel (undo, download, continue editing) remains unchanged
+
+### Rotate/Flip: Live CSS Preview
+
+Replace the "process then compare" flow with live preview:
+
+- When a file is loaded, it shows in the image viewer as normal
+- As the user adjusts controls (rotate buttons, angle slider, flip toggles), CSS transforms update the preview in real-time — no server call
+- Controls stay the same: quick rotate 90 left/right, angle slider 0-360, horizontal/vertical flip toggles
+- The "Process" button label changes to "Apply" to signal finality
+- Clicking "Apply" sends to the server, produces the final file
+
+### Rotate/Flip: Result Display
+
+After applying:
+- Result shows in the standard ImageViewer (no before/after slider, no side-by-side)
+- The transformation is self-evident
+- Review panel appears with undo/download options
+
+## Files to Modify
+
+### Frontend
+- `apps/web/src/components/tools/resize-settings.tsx` — rewrite with tab-based UI
+- `apps/web/src/components/tools/rotate-settings.tsx` — add live CSS preview controls
+- `apps/web/src/pages/tool-page.tsx` — conditionally render side-by-side for resize, skip before/after slider for rotate/flip
+- New component: `apps/web/src/components/common/side-by-side-comparison.tsx` — reusable side-by-side thumbnail comparison
+
+### No Backend Changes
+- Resize and rotate API routes remain unchanged
+- Image engine operations remain unchanged
+- Only the frontend presentation and interaction model changes