Substack Social Preview Image Resizer
Prepare a 1200×630 Substack social or post preview and keep the subject centered for thumbnail cropping.
Substack social preview size
Substack social preview size: At least 1200×630 px
Substack also describes a 14:10 preview crop, so treat 1200×630 as the source canvas and inspect the generated preview.
1200
width (px)
630
height (px)
~17:9
aspect ratio
Need other dimensions? Browse all Substack sizes or use the free image resizer for any platform.
Sources
We check platform-specific dimensions against source documentation when available.
- Substack Support — Optimal publication image dimensions - Substack lists its logo, email banner, cover, and social-preview image guidance.
Prepare Substack Social Preview Image
Place the subject and short headline near the center so the image can tolerate a tighter thumbnail crop. The official help text mentions both a 1200×630 minimum and a 14:10 preview ratio, so the live preview is the final authority.
How to resize an image for Substack Social Preview Image?
- 1
Step 1: Choose a suitable source image
Choose a landscape image with generous space around the focal subject.
- 2
Step 2: Apply the 1200×630 preset
Upload the image, choose Social Preview, and use Fit or Fill to control the crop.
- 3
Step 3: Review and upload
Download the image, add it as the post preview, and inspect the generated card before sharing the link.
Substack recommends at least 1200×630 pixels and notes that preview thumbnails can use a 14:10 crop.
All Substack Image Sizes
Choose another available Substack canvas and review its source notes
Creator and Community Image Sizes
Prepare artwork for creator pages, newsletters, music releases, streaming channels, support pages, and chat communities using source-backed presets.
Substack
- Substack Publication Logo
- Substack Wordmark
- Substack Email Banner
- Substack Welcome Page Cover
- Substack Social Preview Image
File tools
Convert the resized image
Need a different file format or transparent background? Choose a focused converter, then check the preview and encoded size before downloading.
Put Your Substack Social Preview Image Image Into a PDF
Put one image on each page, arrange the order, and create the PDF in your browser.
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