Video image size guide
YouTube Thumbnail Size: Official 3840 × 2160 Guide
For video thumbnails, YouTube currently recommends 3840 × 2160 px at 16:9. The familiar 1280 × 720 size uses the same ratio, but it is not the current official recommendation. ImagePrepLab offers that smaller preset for a browser-based crop and export workflow; check the file size separately before uploading.
Build a thumbnail that reads quickly
At thumbnail scale, contrast and hierarchy matter more than decoration. Start with one clear subject, reserve a simple area for text, and avoid placing important details at the extreme edges. Before exporting, zoom out in the editor to check whether the title is still legible.
ImagePrepLab can crop the source image to 16:9, add a shape crop or privacy cover, place multiple text layers, and add a simple dimension marker when the image needs a measurement callout.
Thumbnail dimensions compared
| Use | Pixels | Ratio |
|---|---|---|
| YouTube video recommendation | 3840 × 2160 | 16:9 |
| YouTube Shorts recommendation | 2160 × 3840 | 9:16 |
| ImagePrepLab video preset | 1280 × 720 | 16:9 |
The minimum specified by YouTube is 640 px wide for videos or 640 px high for Shorts. A larger source helps preserve detail, but enlarging a small photo does not restore missing detail.
The current editor has a 1280 × 720 video preset and a 1080 × 1920 portrait preset. Custom changes the ratio, with a 2000 px long edge: it is not an exact pixel-size input, so entering 3840 and 2160 there does not produce a 3840 × 2160 file. Use a workflow that supports exact dimensions if you need the official recommended resolution.
Crop or fit, then export a thumbnail
- Open the editor and upload the image.
The link above starts with the YouTube preset. After loading a photo, select 16:9 under Crop ratios and confirm that Output pixels reads 1280 × 720. - Choose the composition.
For a crop, move or resize the crop frame and adjust Zoom to keep the subject inside it. Press Enter with the ratio selected to confirm the crop. To preserve the entire photo instead, click Fit full image under All layers; unused canvas space becomes padding. - Add text only where it helps.
Use Add text layer for a short title. Review the whole composition at a small display size, including any padding, before downloading. - Select a format and check size.
Choose JPG or PNG in Format. JPG exposes Quality from 50% to 100%; lower it gradually if the file is too large. PNG has no quality slider. The size next to Download image updates after the image or settings change. - Download and inspect the real file.
Click Download image, then open the file to check the crop, text, pixel dimensions and file size. Use that file for your YouTube upload; the editor does not publish it to YouTube.
Format, quality and upload limits
YouTube lists JPG and PNG as example upload formats. Choose one of those for this workflow; ImagePrepLab also exports WebP, but that capability does not establish YouTube upload compatibility.
The current mobile limit for video thumbnails is 2 MB; desktop uploads allow 50 MB for video, Shorts and podcast thumbnails. Custom Shorts uploads are currently available in YouTube Studio on a computer. Check the linked official help for account and upload eligibility.
Pixel dimensions alone do not guarantee a file below the upload limit. Image detail, format and quality affect its size. The editor's estimate uses the same encoded image as the download, but its MB label is rounded; leave a margin and inspect the downloaded file's properties rather than treating a displayed 2.00 MB as proof it fits.
For a photographic thumbnail, compare JPG at different Quality settings. PNG may preserve text and flat graphics well but can be larger. If more compression is needed, see the JPEG compression guide; the editor does not automatically target 2 MB.
Verified against the source
Common questions
Can ImagePrepLab export the official recommended 3840 × 2160 size?
The current video preset exports 1280 × 720. Custom controls the ratio rather than exact output pixels, so this page does not promise a 3840 × 2160 export. Always read Output pixels before downloading.
Can I add several pieces of text?
Yes. Text is stored as separate layers so each item can be selected and edited independently.
Is 1280 × 720 the official recommendation?
No. It is a common lower-resolution working size and the editor's current video preset. It exceeds the stated minimum video width, but file size, account eligibility and thumbnail policies still apply.
Do I need to convert a PNG to JPG?
Not just because it is PNG: YouTube lists PNG as an upload example. If a PNG is too large, try JPG, adjust Quality and compare the downloaded image before uploading.