Crop any image to a 21:9 ultrawide aspect ratio online for free. Perfect for cinematic photos, ultrawide wallpapers, and website banners. No upload — works in your browser.
The cinematic ultrawide format — perfect for film-style photos, ultrawide monitor wallpapers (3440×1440 px), and wide website hero banners.
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To crop an image to a 21:9 aspect ratio for free, open the SammaPix Crop tool, select the 21:9 preset, drag the crop box over the part of the image you want to keep, and download. The crop box locks to 21:9 so the proportions are always exact. Everything runs 100% in your browser — no upload, no signup, no watermark — and cropping removes only the pixels outside the frame, so there is no quality loss.
Open the SammaPix Crop tool and drop your image in. Supports JPEG, PNG, and WebP.
Choose the 21:9 ratio. The crop box locks to 21:9 — drag and resize it over the area you want to keep.
Download your perfectly cropped 21:9 image instantly. Everything stays in your browser — nothing is uploaded.
21:9 is an aspect ratio — these are the pixel sizes people most often export after cropping.
| Use | Pixels (W × H) |
|---|---|
| Ultrawide wallpaper | 3440 × 1440 |
| Cinematic banner | 2560 × 1080 |
21:9 gives a dramatic, cinematic letterbox look — ideal for landscapes, panoramas, and hero banners.
For an ultrawide monitor wallpaper, crop to 21:9 then export at 3440×1440 px (the common ultrawide resolution).
You lose a lot of top and bottom at 21:9 — keep the horizon and subject within the narrow central band.
Web hero banners often use 21:9 or wider — crop to it so the banner spans full width without vertical bulk.
Ready to crop?
Use the Crop tool to crop your image to 21:9, or browse all aspect ratios.
21:9 is the ultrawide, cinematic ratio used by widescreen films and ultrawide monitors. Its width is about 2.33× its height. Common resolutions are 2560×1080 and 3440×1440 px.
Open the SammaPix crop tool, choose the 21:9 ratio, and frame the scene within the wide band. Export at your target size — 3440×1440 px for ultrawide wallpaper, or a wide width for a web banner.
21:9 suits cinematic landscape photos, panoramas, ultrawide monitor wallpapers, and full-width website hero banners. Its dramatic width creates a film-like, immersive feel.
Yes — 21:9 is very wide, so cropping a standard photo to it removes significant top and bottom. Start from a wide landscape or panorama, and keep your subject and horizon centered vertically.
Crop to 16:9
The widescreen standard — perfect for YouTube thumbnails and videos (1280×720, 1920×1080), presentation slides, desktop wallpapers, and any 16:9 display or player.
Crop to 2:1
The wide banner format — perfect for X (Twitter) summary card images, website header banners, and panoramic compositions (commonly 1200×600 px).
Crop to 4:3
The classic standard — perfect for traditional photography, iPad and tablet screens, older monitors and TVs, and many presentation templates.
Crop to 1:1
The classic square — perfect for Instagram feed posts, profile pictures and avatars, album covers, and product thumbnails that display as a square.
100% private
All cropping happens in your browser. Your images never leave your device — nothing is uploaded to any server.
Exact ratios
The crop box locks to the exact aspect ratio, so your output proportions are always perfect — no manual math.
Free, no limits
Crop as many images as you want. No watermarks, no sign-up, no daily caps on the free plan.