Preview common centre crops and download a resized thumbnail from your image.
n Inputs are processed locally by this tool. Other site plugins, hosting logs, ads and embeds have their own data handling. Text limit: 1 MiB UTF-8.
How to use Thumbnail Preview & Image Maker
- Upload an image you can use.
- Select a crop and format.
- Inspect clipped subjects; download the layout that suits your project.
Example
Choose 16:9 to make a 1280 × 720 landscape image. Compare the vertical and square crops before downloading.
Method and formula
A centre crop fills the chosen canvas while keeping source proportions. The preview draws an optional illustrative inset guide over the displayed image; this guide is not included in the downloaded file. Output uses the fixed dimensions shown in the layout selector.
Limits and supported input
JPEG, PNG and WebP only, up to 15 MiB and 24 million source/output pixels, with each output side at most 8,000 pixels. GIF, SVG, APNG and animated WebP are rejected. Browser format support varies. Canvas re-encoding can remove metadata and change colour handling; keep the original. Centre cropping can cut off faces or text. Guides are illustrative and do not guarantee a platform safe area or display treatment.
Privacy
This tool processes the input in your current browser tab. It does not upload your input or call a paid or remote API. Copying places text on your system clipboard; downloading saves a file on your device. Site hosting logs, analytics, ads, third-party embeds and other installed plugins are separate and can have their own data handling. JavaScript is required for the tool, while this explanation remains available without it.
Frequently asked questions
Can I drag the crop?
This version uses a centre crop. Adjust the source in an image editor for custom framing.
Will the inset guide appear in my download?
No. The guide is an illustrative preview overlay only.