Upload your thumbnail
Drop, choose, or paste the final artwork. The checker reads its dimensions, ratio, format, and source file size locally in your browser.
YOUTUBE THUMBNAIL SIZE
YouTube Thumbnail Size Checker
Check a thumbnail against the current 16:9 target, diagnose quality, crop and file-size risks, then reframe and export a clean YouTube-ready image.
CHECK & PREPARE
Make your thumbnail upload-ready
Upload device · file-size limit
Checks the 50 MB desktop file-size limit only. Dimensions and crop stay the same.
Recommended3840 × 2160 px
Aspect ratio16:9
InputJPG, PNG or WebP
Desktop file limit50 MB
Drop your thumbnail here
or paste an image from your clipboard
JPG, PNG or WebP · processed locally in this tabLIVE PREVIEW
Recommended 4K · 3840 × 2160
Drag image to reposition
Planning preview: the edge buffer and duration-badge mark are composition aids, not an official universal YouTube safe zone. YouTube surfaces and overlays can vary by device and interface.
Desktop grid planning viewWider desktop-card simulation
12:34
Mobile feed planning viewNarrower mobile-card simulation
12:34
READINESS
What will happen to this thumbnail?
Source image—Waiting for an image
Aspect ratio—16:9 is the target
Image quality—Upscale risk will appear here
Crop loss—Visible source area will appear here
Desktop upload file——
Source format—JPG or PNG is the export target
Export target3840 × 2160Current recommended 4K size
Estimated exportCalculating…JPG at 90%
Ready to check
Review the ratio, quality, file-size and small-display previews before you download.
✓ Free to use✓ No signup✓ Runs in your browser✓ No image-processing upload
How to Use Motricialy YouTube Thumbnail Size Checker
Choose the upload limit
Pick Desktop or Mobile to validate the appropriate file-size limit. This setting does not change the thumbnail dimensions or crop.
Fix framing and quality
Use Fill & crop or Fit all, then drag and zoom while checking upscale risk, crop loss, and the selected 16:9 output.
Preview and export
Switch the independent Desktop or Mobile planning preview, then download a clean JPG or PNG without the planning overlays.
Key Features
Current 16:9 target check
Checks the current recommended 3840 × 2160 target while keeping compatible 1080p and 720p 16:9 outputs available.
Upload-device limits
Switch between desktop and mobile file-size validation without pretending that the selected upload path changes image framing.
Real crop bounds
Fill, fit, zoom, and drag use the actual image overflow so edge-to-edge framing cannot accidentally reveal empty background.
Quality + crop diagnostics
See approximate upscaling and crop loss before export so a technically correct canvas does not hide a blurry or over-cropped source.
Independent device preview
Switch the simulated viewing surface between desktop-grid and mobile-feed scale without confusing preview mode with upload limits.
Local JPG / PNG export
Export 4K, 1080p, or 720p locally. JPG can reduce quality when needed to fit the selected upload-path file limit.
Why older guides can still show 1280 × 720
YouTube's current guidance recommends 3840 × 2160 for standard video thumbnails at 16:9, while still publishing a lower minimum width. That is why an older 1280 × 720 file can remain technically compatible even when it is no longer the current recommended target.
The tool also treats upload file size separately from visual preview. Selecting Desktop or Mobile changes the file-size validation only; the separate Preview device switch changes the simulated small-display view.
Recommended standard video3840 × 216016:9 current recommendation
Compatible lightweight preset1280 × 72016:9 compatible output
Upload file-size paths50 MB / 2 MBDesktop / mobile validation
YouTube Thumbnail Size FAQ
What is the current recommended YouTube thumbnail size?
The tool uses 3840 × 2160 pixels as the current recommended standard-video target and keeps the frame at 16:9.
Is 1280 × 720 still useful for a YouTube thumbnail?
Yes. It remains a practical 16:9 output and the tool labels it Compatible rather than the current Recommended 4K target.
Does choosing Mobile change the thumbnail crop?
No. The Upload device control changes file-size validation only. Use the separate Preview device switch when you want to inspect a narrower mobile-feed presentation.
Why does the tool warn about upscaling?
Changing the output canvas to 3840 × 2160 does not create new source detail. Large enlargement can leave text, screenshots, or photos looking soft even when the exported file has the recommended dimensions.
Are the edge and duration guides official YouTube safe zones?
No. They are conservative planning aids. YouTube does not publish one universal fixed safe-zone map for every thumbnail surface and interface state.
Does Motricialy upload my thumbnail?
No image-processing upload is required. Decoding, positioning, previewing, and JPG/PNG export happen in your current browser tab.