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YouTube 썸네일 크기 종류 정리
YouTube 썸네일 크기별 특징과 상황별 선택 기준을 설명합니다.
썸네일은 여러 크기로 제공됩니다. 목적에 맞는 크기를 고르면 흐릿한 비교를 줄일 수 있습니다.
Why multiple sizes exist
YouTube serves different thumbnail sizes for different surfaces.
That is why one image can look sharp on desktop but soft in another context.
Common sizes you will see
Most extractors show default, medium, high, and max-resolution variants.
Not every video has every size, especially older uploads.
- Default: fast preview.
- Medium/High: general review.
- Max resolution: best for detail checks.
How to pick the right one
If you are inspecting typography or small details, start with the largest option.
If you only need a quick visual reference in notes, a medium size is often fine.
Quality check tips
Zoom to inspect edges and text clarity before using a thumbnail as inspiration.
If quality is weak at source, do not expect perfect results after resizing.
Useful for
- Checking image sharpness before analysis.
- Preparing visual audits for a channel.
- Selecting the best reference size for slides.
Always compare size before reuse
Use the largest available image for quality checks, then scale down only if needed.