GitHub Thumbnail Generator

A strong repository social preview should look intentional at full size and remain clear when GitHub displays it in a compact interface. This generator creates an exact 1280 × 640-pixel image, gives you a live crop preview and shows a safe zone for the details that matter most.

A repository social preview represents the project when its link is shared. Use the space for a recognizable project name, a concise value statement or a strong product visual instead of a dense screenshot.

Recommended composition for GitHub

Start with a source image large enough to cover the 1280 × 640-pixel canvas without enlargement. Establish one primary subject, then place any supporting text inside the safe-zone lens. Short headlines, generous spacing and clear contrast are more dependable than small captions or crowded decoration.

• Use the highest-quality original available instead of repeatedly editing an already compressed download.
• Keep the main face, logo, product or headline inside the visible safe-zone lens.
• Zoom only as much as needed; excessive enlargement can make a small or soft source image look blurred.
• Check contrast at a reduced size, because subtle colors and thin lettering can disappear in a feed or chat list.
• Use the position controls for precise framing after dragging the image into place.

Choose the right export format

Use PNG when the design contains crisp lettering, diagrams or interface graphics. JPG is usually efficient for photography, and WebP can reduce file size while preserving useful detail. Social platforms may recompress uploads, so inspect the downloaded image before publishing. The quality control applies to compressed formats, so begin near the high end and reduce it only when a smaller file is important. The downloaded dimensions remain 1280 × 640 pixels regardless of the selected format.

Safe-zone and crop checks

Test the image against both light and dark surroundings. Ensure the repository name or avatar subject remains clear at reduced size and that no essential detail depends on a very thin border.

The safe-zone overlay is a composition guide rather than part of the exported file. Turn it off briefly to inspect the clean image, then turn it back on before the final download. If the source contains a face or logo near an edge, reduce the zoom or reposition the crop until every essential detail has comfortable clearance.

Before you publish

1. Confirm that the downloaded file measures exactly 1280 × 640 pixels.
2. Open the file once and inspect sharpness, color, spelling and alignment.
3. View it at a small size to simulate a mobile feed, comment, search result or chat placement.
4. Check that the subject is recognizable without depending on surrounding page text.
5. Keep an editable original so future platform or branding changes do not require starting over.
6. Use the specification link above when you need to confirm the platform's latest publishing guidance.

Private browser-based editing

Your selected image is cropped, resized and encoded locally in the browser. It is not uploaded to RankSmartTools for processing. This makes the tool suitable for portraits, client assets, unreleased campaigns and brand files that should remain on your device. When the export is complete, you can replace the image and create another variation without signing in.