Is my image uploaded to your server?

The image file is opened and rendered locally in your browser. This tool does not upload it for processing.

Does this measure contrast or predict CTR?

No. Review readability yourself at small sizes. Only real platform performance data can show how an audience responds; a preview does not guarantee clicks.

What size is the downloaded image?

Landscape exports are 1280 × 720 pixels; portrait exports are 1080 × 1920 pixels. Downloaded PNGs contain your artwork and optional text, without preview controls or a phone frame.

Does the small preview change the export?

No. The small preview changes only the displayed width. The PNG retains your selected output dimensions. Switching the export format changes the centre crop, so check the subject again.

Can I upload this portrait cover to YouTube Shorts?

This tool creates an image file, not a YouTube upload. Shorts thumbnail selection and upload support depend on YouTube's current workflow. Check the options available in your app.

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thumbnail previewer

Thumbnail Text Previewer

Preview a thumbnail at small sizes and export a clean landscape or portrait PNG.

Thumbnail editor

Background image

JPG, PNG or WebP, up to 15 MB. Your image is processed in this browser.

Export format

Overlay text (optional)

Use a short, accurate promise. Clear this field for an image-only export.

Font size: 84 pxText position: 50%

Text colour Outline colour

Preview your actual export

Source resolution

No image selected

Human review

Can you read it at 320 px? Does the centre crop preserve the subject? This tool does not score contrast or predict clicks.

The image is centre-cropped to your selected format. Preview size changes only the display, not the exported pixels. Portrait is a design preview; platform upload and frame-selection rules still apply.

Make the image support the story

Use a relevant subject, keep important details away from the edges, and inspect the exported file. Avoid fake results, misleading screenshots and text that promises more than the video delivers.

For article covers, prefer a strong image with little or no overlay text. For video thumbnails, compare a few honest concepts and use your platform’s analytics to assess real performance.

How to Use the Thumbnail Text Previewer

Upload a JPG, PNG or WebP image, add optional text, choose a 1280 × 720 landscape or 1080 × 1920 portrait canvas, and inspect the centre crop at 320 pixels wide. Download the same artwork at full output resolution without a phone frame. Images are processed in your browser. This is a visual design aid: it does not calculate contrast scores, simulate the exact YouTube interface or predict click-through rates.

Perfect for...

Video creators

Check whether a subject and short headline remain readable in a 320-pixel preview.

Graphic designers

Export a clean PNG with the same crop and text as the preview.

Article editors

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