Preview Celtra ad creatives in standard IAB sizes with device simulation and publisher context. Select a device type, size, position, and preview mode — the tool generates the sandbox URL.
How It Works
1. Enter a Creative ID
Paste the 8-character hex Creative ID (e.g. 81e89b8a) from Celtra into the input field. The tool immediately generates a preview URL and loads it in the iframe.
2. Choose a Device Type
| Device | Behaviour |
|---|---|
| Phone | Constrained iframe width matching real device viewports (320–428px) |
| Tablet | Constrained iframe width for tablet viewports (600–800px) |
| Desktop | Full-width iframe with simulated webpage frame |
3. Select Device Size
Phone sizes:
| Label | Width | Comparable Devices |
|---|---|---|
| XS | 320px | iPhone 5 |
| S | 375px | iPhone 13 Mini, Galaxy S21 |
| M | 390px | iPhone 14, Galaxy S21 Plus |
| L | 428px | iPhone 14 Plus, Galaxy S21 Ultra |
Tablet sizes:
| Label | Width | Comparable Devices |
|---|---|---|
| S | 600px | 7" Galaxy Tab 7 |
| M | 768px | 9" iPad, Nexus 7 |
| L | 800px | 10" Galaxy Tab 10 |
4. Configure Preview Options
| Option | Values | Description |
|---|---|---|
| Preview Mode | Inline, Sticky Top, Sticky Bottom, Fullscreen | Controls how the creative is positioned on the simulated page |
| Fold Position | Above the fold, Below the fold | Where the creative appears relative to the fold |
| Creative Position | Top, Sidebar Left, Sidebar Right | Desktop only — controls creative placement on the page |
5. Publisher Overlay
Select a publisher from the dropdown to overlay a simulated navigation bar on the preview. This helps visualise how the ad creative appears within a publisher's site context.
URL Sharing
The tool's URL updates with hash parameters as you change settings. Copy and share the full URL to let others open the same preview configuration.
Example: index.html#id=81e89b8a&device=Phone&phoneSize=390&fold=below
Mobile Behaviour
On mobile devices, the tool redirects directly to Celtra's native preview URL instead of showing the sidebar UI. The shareable hash URL still works — opening it on desktop shows the full tool interface.
Generated URL Format
The tool generates Celtra sandbox URLs in this format:
https://preview-sandbox.celtra.com/preview/{creativeID}/frame?{params}
Use the Copy URL button to copy the generated URL, or Open to launch the preview in a new tab.