Exact dimensions
See the image's natural pixel width and height, independent of how it looks on screen.
CREATOR TOOLS
Thumbnail size checker.
Check dimensions and aspect ratio.
Upload an image locally and compare its dimensions with common social media thumbnail and post presets. Your image is never uploaded.
Thumbnail size checker
Choose a platform preset, then select a JPG, PNG, or WebP image to check its exact pixel dimensions.
Your image preview appears here
Common presets
Compare YouTube, Instagram, Stories, Facebook, LinkedIn, and TikTok sizes.
Private by design
Your image stays in this browser and is not sent to TURUBA or a third-party server.
Thumbnail checker questions
Does this resize my image?
No. This tool checks dimensions only. Use the Image Resizer tool if you need to create a new size.
Which image formats are supported?
JPG, JPEG, PNG, and WebP images supported by your browser can be checked.
PRACTICAL NOTES
Check shape as well as resolution
How to approach it
Choose a layout and an image. The tool reads the actual pixel dimensions and compares them with the selected preset. Matching aspect ratio means the image has the same shape, even if its resolution differs. A mismatch may need cropping or padding.
A concrete example
A 1920 × 1080 image has the same 16:9 shape as a 1280 × 720 layout. It is not automatically unsuitable because the exact pixel count differs. A square photo needs a composition decision before it becomes a wide thumbnail.
Before you use the result
Presets are common working layouts, not a live platform acceptance check. Platform upload limits and placements can change. Confirm the current requirements before publishing and keep text away from edges or interface overlays.
Updated 4 November 2026 · TURUBA Tools
Thumbnail Size Checker questions
Does a matching aspect ratio guarantee a good thumbnail?
No. Dimensions and ratio are only part of the design. Review legibility, subject placement and platform cropping before publishing.
What should I do when the dimensions do not match?
Open the image resizer to change pixel dimensions or crop the image for the intended layout. Recheck the exported file rather than just the original.
IMAGE CHECKS
Check the image after it has a destination
Start by selecting the placement where the image will appear. A YouTube thumbnail, Instagram square and LinkedIn cover use different shapes, so an image that looks good in one crop may lose its subject in another. Upload the exact file you plan to publish rather than a larger source image from earlier in the design process. The checker reports its dimensions and aspect ratio against a preset. It cannot see whether a face is cut off, text is legible or a platform will later crop the image in a different surface.
Separate shape from pixel count
Aspect ratio describes width relative to height. A 1920 by 1080 image and a 1280 by 720 image share a wide 16:9 shape even though they contain different numbers of pixels. If the shape matches but the dimensions do not, resizing may be enough. If the shape differs, stretching the image to the preset can distort people and products. Decide what to crop, or add space around the composition, then check the result. Start with a high-quality original because enlarging a tiny image can make it look soft.
Inspect the design at the size people see
A thumbnail usually appears much smaller than the editing canvas. Reduce the preview on your screen and see whether the main subject remains obvious. Keep short text away from edges and from areas where the platform may place controls or timestamps. Small logos and thin lettering often disappear first. Check contrast against both light and dark surroundings when the platform uses different themes. A dimension match is a technical check, not a design review; ask another person what they notice first.
Export and check again
If you crop or resize in another tool, run the exported image through the checker again. Some editors add padding or choose a different export size from the canvas size. Open the final file, not just the preview in the editor, and check that the colour, text and focal point survived. Keep a copy of the uncropped original for other placements. Platform specifications and file-size limits can change, so confirm the current upload requirements before a campaign or important release.
When one image must serve several platforms, design from the most important subject area and make separate exports. A single aggressive crop can work for a square feed post but fail in a wide video card. This tool can tell you the measured shape; the final composition is a deliberate choice. If you add text to a thumbnail, test it on a small phone screen before approving the design. A phrase that reads well on a large monitor may become a blur in search results. Leave breathing room around faces and product edges, and avoid placing the only important detail where a duration badge or interface label may appear.
If a platform creates several crops from one upload, check its preview in each placement before publishing. A thumbnail may be wide in search and square in a profile grid. Keep essential text and faces near the safe central area when you cannot control every crop. The checker gives a dimension comparison, while the platform preview shows the final placement.