Redimensionneur de miniatures YouTube gratuit - Redimensionnez vos images YouTube

Utilisez notre Redimensionneur de miniatures YouTube gratuit - Redimensionnez vos images YouTube gratuitement. Aucune inscription requise.

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Les miniatures YouTube doivent faire exactement 1280×720 pixels au ratio 16:9. Importez autre chose et YouTube rejette le fichier ou le compresse jusqu'au flou. Ce redimensionneur de miniatures YouTube gratuit recadre et met à l'échelle n'importe quelle image aux bonnes dimensions instantanément — sans inscription, sans filigrane, sans perte de qualité. Fonctionne pour les vidéos standard, les miniatures verticales des Shorts et les bannières de chaîne.

Official YouTube thumbnail specs in 2026

YouTube's documented thumbnail requirements: 1280×720 pixels minimum (720p), 16:9 aspect ratio, under 2MB file size, JPG/GIF/PNG format. The 16:9 ratio is mandatory — non-16:9 images get auto-cropped with black bars or stretched into distortion.

Upload at 1920×1080 (still 16:9) if you have the source resolution — YouTube downsamples to display sizes, and a higher-res master future-proofs as YouTube rolls out 4K thumbs to TV screens. The resizer above outputs at 1280×720 by default and offers 1920×1080 if your source supports it.

YouTube Shorts thumbnails: different rules

Shorts thumbnails follow a 9:16 vertical ratio instead of 16:9. Recommended size: 1080×1920 pixels. Same 2MB cap, same JPG/PNG/GIF format support.

Shorts thumbnails matter less than video thumbnails in the discovery flow — Shorts mostly auto-play from the feed without needing a thumbnail click. But your Shorts thumbnail still shows up on your channel page, in playlists, and in mobile search results. So treat it as a 'looks good when scrolling' image rather than a 'must hook the click' image. The resizer has a 9:16 preset for Shorts.

Why your thumbnail looks blurry on YouTube

Three common reasons. (1) Source image is too small — upscaling a 640×360 thumbnail to 1280×720 introduces visible blur. Always start from a source that's at least 1280×720. (2) JPEG compression artifacts — saving a JPG at low quality (under 80%) for upload creates blocky artifacts that YouTube's compression makes worse. Save at 90%+ quality. (3) Text too small — YouTube's mobile feed shows thumbnails at roughly 320×180 pixels. Text under 60pt at source size becomes illegible at display size.

The resizer preserves source quality and shows a mobile-preview overlay so you can spot text-too-small issues before upload.

Thumbnail design rules that boost click-through

Click-through rate (CTR) on thumbnails averages 4-6% on YouTube. Top performers hit 10%+. The patterns that drive higher CTR: high-contrast colors (especially yellow/red against dark backgrounds), large readable text (3-5 words max), a single dominant face with expressive emotion, and a clear value-prop visible at mobile-feed size.

Avoid: cluttered backgrounds, four+ visual elements competing for attention, low-contrast text (white-on-light-background, dark-on-dark), and overly literal images of the topic (a thumbnail of 'a coding tutorial' showing code is weaker than 'a confused person looking at code'). The resizer doesn't change your design, but the mobile preview helps you spot the worst offenders.

Conseils pour tirer le meilleur parti de cet outil

  • Always upload at 1280×720 minimum. Lower resolutions trigger YouTube's auto-blur.
  • Save thumbnails as JPG at 90%+ quality. PNG works but file size hits the 2MB cap fast.
  • Test your thumbnail in mobile preview — most YouTube watch time happens on mobile.
  • Use no more than 3-5 words of text. Anything more becomes illegible at feed size.
  • Refresh underperforming thumbnails. YouTube allows unlimited thumbnail edits post-publish.

Questions fréquentes

What is the correct YouTube thumbnail size?

1280×720 pixels minimum, 16:9 aspect ratio, under 2MB file size. YouTube recommends 1920×1080 for higher-resolution displays.

What is the YouTube Shorts thumbnail size?

1080×1920 pixels at a 9:16 vertical aspect ratio. Same 2MB file size cap and JPG/PNG/GIF format requirements as standard thumbnails.

Is the YouTube thumbnail resizer free?

Yes. Free, no signup, no watermark. Upload any image, get a properly sized YouTube thumbnail in seconds.

Is YouTube thumbnail 1280×720 or 1920×1080?

Both work. 1280×720 is the minimum requirement. 1920×1080 is YouTube's recommended size for higher-res displays and future-proofing. Both are 16:9 aspect ratio.

Why does YouTube reject my thumbnail?

Three common reasons: file size over 2MB, wrong aspect ratio (not 16:9), or unsupported format (must be JPG, PNG, or GIF — no WebP, BMP, or TIFF). The resizer outputs in valid format and dimension by default.

Can I change my YouTube thumbnail after publishing?

Yes — unlimited times. Many channels A/B test thumbnails by changing them every few weeks for older videos and tracking CTR in YouTube Studio.

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