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Preset is pre-configured
This page opens with the target resolution locked to 851×315px (2.7:1), perfectly tuned for Facebook.
Facebook Cover Photo Size
Displays at 820×312 on desktop, 640×360 on mobile — keep content centered. Resize to exactly 851×315px in your browser — nothing is uploaded.
Size851 × 315pxRatio2.7:1PlatformFacebook
Resize to 851 × 315px
Crop, scale, and export in PNG, JPG or WebP
Drop images here, or click to choose files
Processed locally in your browser · Zero server uploads
ReadsPNG, JPG, WebP, GIF, BMP, SVG, AVIF, ICO, HEIC, TIFF, JPEG XL
WritesPNG, JPG, WebP
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Client-Side Architecture
How resizing to 851 × 315px works
Resizing is averaging: turning nine source pixels into one, several million times over. Which pixels get averaged, and in what colour space, is the whole difference between a sharp result and a soft, slightly darkened one. This resizer decodes 11 input formats — including the HEIC an iPhone actually produces — resamples with Lanczos3 in linear light, and writes PNG, JPG or WebP, all inside this browser tab.
Batch Resize Workflow851 × 315px
Drop a batch in, pick Crop to fill or Fit, and every file is resampled to the exact pixel size on your own device — then downloaded one by one or as a single ZIP.
Resize Architecture100% In-Browser Memory Pipeline
Source Image11 formats
HEIC · TIFF · JPG · PNG
Decoded to raw pixels by the same pipeline the converter uses, so iPhone HEIC and scanner TIFF open without a conversion step first.
Engine: libheif / UTIFZero upload
Web Workerwasm
Lanczos3, Linear Light
Cropped first, then resampled with a 3-lobe windowed sinc — with gamma undone before averaging, because averaging sRGB directly renders the result measurably darker.
Off the main thread100% Private
Result.png .jpg .webp
851 × 315px
Exact dimensions every time. WebP typically lands under half the size of the equivalent JPG and keeps transparency, which PNG does at roughly twenty times the bytes.
Single file or ZIPDirect export
End-to-end local architecture: files are processed strictly within your device’s memory and never leave your computer or phone.
For the full walkthrough — why downscaling in sRGB darkens a photo, what Lanczos3 actually does, and how HEIC now opens without a conversion step — read How the Image Resizer works.
Original image vs. 2.7:1 output
A visual example of the tool's center-crop behavior.
Original example1:1 source
Cover Photo crop2.7:1
How to resize an image for Facebook Cover Photo
Resize your image to exact 851×315px dimensions in three simple steps:
02
Upload and choose mode
Drop your image into the tool. Choose "Crop to fill" for exact borderless coverage or "Fit (pad)" to preserve the entire image with background padding.
03
Instant local export
Preview the result in real time and download as high-quality PNG or optimized JPG. No files are uploaded to any server.
Platform Specifications
About the Facebook cover photo size
The practical preset for a Facebook cover photo is 851×315 pixels (2.7:1). Uploading at the right dimensions keeps your image sharp and prevents Facebook from cropping or compressing it in unexpected ways. If your photo is a different shape, use the image resizer above to crop or pad it to exactly 851×315 before uploading.
Official references
Continue with another image tool
After checking an image, choose a tool for the change you need. Each tool has a different purpose.
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Image Format Converter
Change the image file format, such as PNG to JPG or WebP. This is different from converting pixels to print units.
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Metadata Remover
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Image Size Finder
Check pixel width, height, megapixels and aspect ratio instantly for one image or a full batch.
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Related image presets
Explore more standard sizes for Facebook and other popular platforms.
Popular platform sizes
Frequently used dimensions across major networks:
Facebook Cover Photo FAQ
What size is a Facebook cover photo?
The recommended Facebook cover photo size is 851×315 pixels, an aspect ratio of 2.7:1. Displays at 820×312 on desktop, 640×360 on mobile — keep content centered.
What is the aspect ratio for a Facebook cover photo?
2.7:1 (851×315). Matching this ratio avoids unwanted cropping when Facebook displays your image.
How do I resize my image to 851×315?
Drop your image into the tool above. "Crop to fill" scales and center-crops to exactly 851×315; "Fit (pad)" keeps the whole image and adds padding. Then download as PNG or JPG. Everything runs in your browser — nothing is uploaded.
PNG or JPG for Facebook?
Use PNG for graphics, logos and text (lossless, supports transparency). Use JPG for photos to get a smaller file. This tool exports both.
Free & Private In-Browser Tool
Resize to 851×315 Online Now
Fast, 100% private, and completely free in-browser resizer. Crop or fit your images to exactly 851×315 pixels for Facebook Cover Photo in seconds.