Resize Image to 851×315 (Facebook Cover Photo)

851×315 is the pixel size Facebook uses for the cover photo across the top of a profile or Page — the wide banner behind your profile picture. The awkward part is that Facebook displays it differently on desktop and mobile: on a phone the sides are trimmed and the visible area is taller and narrower, so a design that looks balanced on a laptop can lose its edges on mobile. Sizing to exactly 851×315 and keeping the important content centred is the reliable fix. This tool builds that banner on your device, so a cover you're still perfecting isn't uploaded anywhere.

🔒 Everything runs in your browser — nothing is uploaded

Drag & drop your photo

or click to browse — you can also paste (Ctrl/Cmd + V)

Output: 851 × 315 px

JPG PNG WEBP

🔒 Your photo never leaves your device — everything runs in your browser.

Good to know

Outputs exactly 851 × 315 pixels — Facebook's display size for a Page or profile cover photo.

Keep logos and text roughly centred: Facebook trims the left and right edges on mobile.

On a profile, the lower-left corner sits behind your circular profile picture — leave that area clear.

"Cover" fit fills the wide banner and trims overflow, so there are no blank strips at the sides.

Upload at 851×315 (or an exact 2× of it) so Facebook doesn't re-scale and soften the image.

Runs entirely in your browser — no upload, no account, nothing stored.

Related image tools

Want a different size? Use the full Resize Image tool to type any width and height, or Compress Image to shrink the file size after.

How it works

Three steps. No sign-up, no upload, no wait.

Add your photo

Drop in an image, click to browse, or paste it — nothing is uploaded.

Resize to 851×315

It's cropped and scaled to the exact pixel size on your device.

Download

Save the resized image, ready to post.

🔒

Private by design.Everything happens right here in your browser. Your files are never uploaded — we never see them.

Frequently Asked Questions

What is the correct Facebook cover photo size? ▼

Facebook displays cover photos at 851×315 pixels on desktop. Supplying the image at that exact size (or a clean multiple of it) means Facebook doesn't have to rescale it, which keeps the banner crisp.

Why does my Facebook cover look cropped on my phone? ▼

Facebook shows a narrower slice of the 851×315 banner on mobile — the left and right edges are trimmed and the visible strip is relatively taller. Designs that hug the edges lose content there, so centring your key elements keeps them visible on both desktop and mobile.

Should I leave space for the profile picture? ▼

On a personal profile, yes — the circular profile photo overlaps the lower-left of the cover. Keep that corner free of text or faces so nothing important is hidden behind it. Business Pages position the profile image differently, so check your Page layout.

Is my cover photo uploaded to resize it? ▼

No. The resize runs on a canvas in your browser, so the image never leaves your device.