Image Sizes for Social Media and Chat Apps

What platforms do to your pictures

Social networks and messaging apps handle millions of pictures, and to save storage and bandwidth they usually process every upload. They scale the image down to a maximum size, convert it to their preferred format and compress it again, often with a quality setting that you cannot see or change. This explains why a sharp photo can look softer or more blocky after you post it, and why a picture that has been shared again and again gets worse each time.

The exact rules differ between services and change over time, and they are rarely documented in detail. Treat the specific numbers that you find in guides with caution, and check the current guidance of the platform if the result matters, for example for advertising or for a profile banner.

Why you should prepare the file yourself

If you upload a 12-megapixel photo, the platform has to scale it down anyway. That takes longer, uses mobile data and gives you no control over how the downscaling and compression are done. If you scale the picture to a sensible size and compress it with a good quality yourself, the platform has less to change, and the result often looks better, because a single moderate compression is better than one very large one followed by an aggressive one.

It also speeds up the upload on a slow connection, which matters when you post from a phone with a weak signal or a data limit.

Choosing a size

As a starting point, an image with 1080 to 2048 pixels on the longest side is more than enough for a feed post on most phones. Pictures larger than that are usually scaled down by the platform. For thumbnails and small previews, a few hundred pixels are sufficient. For profile pictures, a square image of 400 to 800 pixels is typical, because it is shown in a small circle or square.

These are rough values, not official rules. Whenever a platform publishes recommended sizes, those override this guidance. Look at the aspect ratio too: if the platform crops to a square or to a wide format, crop your picture yourself first so that the important part stays in the frame.

Format and quality

For photos, JPEG is the safest format for social networks, since every platform accepts it. A quality of 80 to 90 is a good choice here, a little higher than for your own website, because the platform will compress the picture once more and you want to give it good material. For graphics with text and sharp edges, PNG avoids artifacts, although the platform may still convert it.

Avoid uploading pictures that have been compressed heavily already, such as screenshots of screenshots or pictures downloaded from other platforms, because each pass adds errors.

Messaging apps

Chat apps usually reduce the size of photos that you send as pictures, to save data for you and for the recipient. Many also offer a way to send the original as a file or document, which keeps full quality but is large. The choice is yours: for a quick snapshot, the automatic reduction is fine; for a photo that the other person wants to print or edit, send the original or a compressed copy at a high quality.

If you send many pictures, preparing them in advance with a fixed maximum size and quality keeps the quality consistent and avoids surprises.

Privacy on social media

A picture can reveal more than you intend. Metadata such as the location may stay in the file, depending on the platform, and details in the background can show where you are. The compressed copy that you create with this tool contains no EXIF data or location, because the file is built again from the pixels.

Think about faces and documents in the picture as well. Compression does not hide them. Crop or cover what you do not want to share before you upload.

A simple routine

Crop the picture to the shape that the platform will show. Add it to the compressor, set the maximum size to 1080 or 1600 pixels, choose JPEG or WebP and a quality of 80 to 85, and compare the size with the original. Download and upload the compressed copy.

Keep the originals for printing and archiving. The compressed copy is only for sharing, and a new one can be produced whenever the requirements change.

Quality over quantity

It is tempting to post as many pictures as possible, but each one costs the viewer time and, on a mobile connection, data. A few well-prepared, sharp images with a clear subject usually do more than a long series of average ones. Preparing each picture properly, with a sensible size and a moderate compression, makes every post load quickly and look clean.

Consistency also matters for a brand or a profile. If all your images use the same size, format and quality, the feed looks uniform, and you spend less time deciding for each picture.