Online Tool Store
Trình kiểm tra xem trước thumbnail
Xem trước thumbnail ở các kích thước mà nền tảng thực sự hiển thị — bảng tin, thanh bên và tìm kiếm di động — để kiểm tra chữ có còn đọc được không.
🔒 Công cụ này chạy hoàn toàn trên trình duyệt của bạn. Tệp của bạn không bao giờ được tải lên máy chủ.
Social Media
Thumbnail Preview Tester
Xem trước giao diện — không tải lên hay dùng dịch vụ ngoài.
Preview sizes
Rendered at 360x202, 168x94, and 106x60 — the four-word headline is legible at the first two and illegible at search size.
How the Thumbnail Preview Tester works
- Upload the thumbnail you are about to publish.
- Compare it at all three sizes, especially the smallest one.
- If the text fails at 106 px wide, cut words rather than shrinking the type further.
FAQ
How many words can a thumbnail carry?
Three or four at most, set very large. The smallest render is around a hundred pixels wide, and anything more becomes texture rather than text at that size.
Does the light or dark background matter?
Yes. A thumbnail with white edges dissolves into a light feed and floats oddly in a dark one. Check both, since viewers control the theme, not you.
Is my image uploaded?
No. It is rendered locally in the page for preview only.
How we compare
| Feature | Online Tool Store | The platform itself | A social suite |
|---|---|---|---|
| Real platform pixel sizes | ✓ | ✗ | Sometimes |
| Light and dark backgrounds | ✓ | Manual | ✓ |
| No upload to a platform | ✓ | ✓ | ✗ |
| Instant iteration | ✓ | ✓ | Varies |
Thumbnail Preview Tester exists because thumbnails are designed at full size and consumed at a hundred pixels — the small preview is the one that decides.