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Ideal image sizes and formats for your posts

In this guide, we’ll share basic information about the recommended sizes and formats you should use for your images when crafting your posts for each social channel we support. We’ll also give you tips on how to improve the quality of your images if you see any degradation or poor image quality when sending through Buffer.

This article contains the following sections:

  1. Ideal image sizes for each social channel
  2. Saving your files and tips for best image quality
  3. Troubleshooting image orientation issues

Ideal image sizes for each social channel

The recommendations here focus on posting images specifically through your Buffer account. Posting through Buffer to a social network utilizes API services, which sometimes handle images differently than if you were to post natively on the social platform itself.

Image size requirements, formats, and automatic resizing

When uploading an image to Buffer, the image must be under 10MB. We currently support JPG and PNG image files for all social networks, and additionally GIF files for Twitter and Pinterest.

Additionally, each social network’s API service has its own image file size limit (which may be different than the native upload limit). If the image you upload is under 10MB, but larger than the limit for that social network, we'll convert it to a smaller size to ensure it can be published. Only one image attribute (width or height) will be adjusted and the other will scale automatically. This ensures that the original aspect ratio will be kept.

Each file size limit is listed under the social network below. Please note, the file sizes listed below are specifically for static images, with GIF file requirements listed separately.

Jump to the relevant section below:

  1. Facebook
  2. Instagram
  3. Twitter
  4. LinkedIn
  5. Pinterest


Minimum width 320 (will be scaled up to the minimum if necessary)
Maximum width 1440 (will be scaled down to the maximum if necessary)
Height Varies, depending on width and aspect ratio
File format JPG, PNG
File size limit 8MB


Minimum width 320 (will be scaled up to the minimum if necessary)
Maximum width 1440 (will be scaled down to the maximum if necessary)
Height Varies, depending on width and aspect ratio
File format JPG, PNG (PNG is recommended)
File size limit 8MB
Aspect ratio Must be within a 4:5 to 1.91:1 range or square

📝 Important notes

  • In order to send your post automatically, your image must fall within the aspect ratio guidelines listed above. You can find guidance and more detail about aspect ratios in this guide. If they fall outside of this aspect ratio, we will send you a reminder, which you can learn about here.
  • If the image you upload is larger than 8MB, we'll convert it to a smaller size (1920 pixels wide) to ensure it can be published. The minimum dimensions accepted is 150 x 150 pixels. Smaller images will be scaled up to the minimum.
  • It's important to save your images in the RGB color profile, avoiding all other color profiles, including AdobeRGB or the standard print profile, CMYK. Unfortunately, ProPhoto RGB color profile (the default color profile in Photoshop and Lightroom) is not supported by Instagram. 


Supported file formats JPG, PNG, GIF
File size limit 5 MB for static image
3 MB for animated GIF

📝 Even if an image is within the file size limit, we will check that the image is smaller than 8192 x 8192 pixels, since this is Twitter's maximum allowed dimension. If it's bigger than that, your image will be resized to be just a little smaller.

Gifs on Twitter

If you see some quality loss or errors when creating your posts with animated GIFs, you can try these recommendations to improve success:

GIF Maximum resolution 1280 x 1080 (width x height)
GIF Maximum number of frames 350
GIF Maximum number of pixels (width * height * num_frames) 300 million


Supported file formats JPG, PNG
Recommended image ratio 1200 x 627
File size limit 10MB

📝 Notes

  • LinkedIn states that the optimal size for images to achieve consistency across various share methods, pages, and experiences, is 1200 x 627 pixels. This image size should prevent cropping and scaling across formats. That said, if you're looking to share the same image across multiple social networks (e.g. LinkedIn, Facebook, Twitter, and Instagram), we'd recommend using a square image to avoid cropping on LinkedIn.
  • An important note on padding and mobile display from LinkedIn:
    “Images uploaded in the recommended 1200 x 627 ratio are automatically displayed on the mobile app with white padding on the top/bottom or sides of the image, to fit the ratio without being cropped. Although a 3:2 aspect ratio, or 1200 x 800, displays fully without padding, we recommend using the industry-standard 1200 x 627 ratio. Link share thumbnail image uploads are displayed in a 2:1 ratio. Limit text in rich media images to the center of the image in a title-safe area.”


Supported file formats JPG, PNG, GIF
File size limit 10MB

Saving your files and tips for best image quality

When scheduling a post through Buffer, we send your image through API services that can handle files a little differently than if you were posting directly on the social channel yourself. This can cause some unexpected results if images are saved in certain ways, so we recommend using these tips if you are seeing distortion, pixelation, or slight color changes.

  • Save your file in PNG (.png) file format, rather than .jpg or other file formats.
  • Avoid transparent backgrounds as they can cause distortion.
  • Save in RGB color mode and try to stay away from other color modes such as AdobeRBG/CMYK.
  • Avoid overly large dimensions for images. If the image needs to be resized by Buffer or the social platform, it could impact the quality of the image.

Troubleshooting image orientation issues

Sometimes, images might appear to be rotated once they have been published to your social channel. When images are uploaded to Buffer, we use the orientation data that is hard-coded in the background of the image based on how it was taken or the tool used to process it. This background information is called the EXIF data. Whilst the image may appear to be the correct orientation when previewing it on your computer, or in the composer after uploading it in Publish, it might be rotated once published.

If this is happening for you, we would recommend using this tool to remove the EXIF data from your images before uploading them. Upload your image and then click Check the box to the right of "EXIF Cleaner" that says "IF CHECKED ALL THE TAGS WILL BE CLEARED" and then click Go.eXifing. This will remove the EXIF data from your image and then you can download the image by clicking "".

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