YouTube Thumbnail Resizer
Resize an image to a clean 16:9 thumbnail without stretching it. Choose crop or fit, then export as JPG, PNG, or WEBP.
Resize your image
Drop an image here
JPG, PNG, or WEBP · maximum 10 MB
3840 × 2160 or 1280 × 720?
YouTube currently recommends 3840 × 2160 for video custom thumbnails. Choose it for a high-resolution 16:9 export. The 1280 × 720 preset remains a common lightweight 16:9 option for practical workflows.
Crop is best when your image can lose some edges. Fit avoids cutting anything off and adds space around a source with a different ratio. Neither mode stretches the image.
Four resizing checks that matter
Keep 16:9
Use a 16:9 preset to avoid unexpected framing in standard video placements.
Never stretch
Crop or fit proportionally so faces, products, and logos retain their natural shape.
Inspect the export
Check fine text and contrast after compression, not only in the original design file.
Think mobile first
Shrink the preview. If the idea is unclear at a glance, simplify the composition.
Compress, preview, and compare
Common resizing questions
Does TubeThumbnail upload my image?
No. Resizing happens locally in your browser using the Canvas API. The selected file is not sent to TubeThumbnail.
Which YouTube thumbnail size should I choose?
YouTube currently recommends 3840 × 2160 for video custom thumbnails. The 1280 × 720 preset remains a useful lightweight 16:9 working and export option.
Should I crop or fit my thumbnail?
Crop fills the complete 16:9 frame and trims overflow. Fit preserves the entire image and adds neutral space when the source has a different aspect ratio.
Which output format should I choose?
Choose JPG for photographic artwork and generally smaller files, PNG for crisp graphics, or WEBP for efficient modern compression.