Resize an image for a YouTube thumbnail
Exactly 1280 × 720, 16:9, and comfortably under YouTube’s 2 MB upload limit.
ここに画像をドロップ
またはクリックして選択
対応形式: JPG, PNG, WEBP, AVIF
ローカルで処理します。画像が端末の外に出ることはありません。
This page has not been translated yet and is shown in English. It is excluded from search indexing for this language until it has been.
YouTube asks for a 1280 × 720 thumbnail at a 16:9 ratio, under 2 MB. The size limit is the one people hit: a high-quality PNG export of a busy thumbnail overshoots it easily, and the upload is rejected with a message that does not explain why.
This tool handles both halves. Resize to the exact dimensions, then use the quality slider and watch the reported file size until it is safely under the limit. Exporting as JPEG rather than PNG usually solves it on its own.
できること
Exact 1280 × 720 output
The dimensions YouTube actually wants, at the 16:9 ratio it displays.
Stay under 2 MB
The export dialog reports the real encoded size, so you can see when you are safely under.
Add text on the same canvas
Thumbnails need large, outlined type. The text panel is one click away, on the same loaded image.
Runs locally
No upload, no queue, no watermark on the result.
使い方
- 1
Load your image
The editor opens with a 1280 × 720 canvas ready.
- 2
Frame it
Fill and crop to use the whole frame, or fit and pad if the composition needs it.
- 3
Add text if you want it
Use the text panel with an outline so the type stays readable at thumbnail size.
- 4
Export under the limit
Choose JPEG, watch the size readout, and download when it is under 2 MB.
KaiConvert を選ぶ理由
- ローカルツールはアップロード不要
- ページ読み込み後はオフラインでも動作
- クラウド AI は開始前に必ず明示