What Image Format Should You Use for Social Media Uploads?
Guide · Social Media
The general JPG-vs-PNG logic (photos as JPG, flat graphics/transparency as PNG) still applies to social media uploads, but platforms add their own compression and processing on top of whatever format you send, which changes some of the practical considerations slightly from a general web-image context.
Most platforms convert everything anyway
Many social platforms re-encode uploaded images into their own preferred internal format and compression level regardless of what you send — meaning some of the fine control you'd have over format choice on your own website doesn't fully carry through once a platform's own processing pipeline runs on it.
PNG still matters for transparency and graphics
If a post includes a graphic with transparency, text, or a logo with hard edges, uploading as PNG rather than JPG still avoids the compression artifacts around sharp edges that JPG would introduce before the platform even applies its own processing — starting from a clean, lossless source still matters even though the platform recompresses afterward.
Photos are still safely JPG
Straightforward photographic content has nothing to gain from PNG's lossless compression, since a platform is going to compress it anyway, and JPG's smaller file size means a faster upload with no visible quality tradeoff for photo content specifically.
Avoid re-uploading platform-downloaded images
As mentioned elsewhere, downloading an image from one platform and uploading it to another (or back to the same one) stacks a second round of compression on top of the first — always go back to your original source file for any re-use, rather than a re-downloaded copy that's already been through a platform's compression once.