I have some graphic design stuff to post on Instagram but no matter what I try, the image comes out blurry. I'd started with a file size of 1080x1080px when making in (currently using InDesign). I tried many export formats (JPEG and PNG in multiple different resolutions/ppis and quality). I even tried exporting to PDF and converting to JPEG but no luck. I've browsed some of the questions on here but I wasn't able to find a solution that worked for my problem. Can anyone help me?
You literally need to deal with it, as it is, and there's some guidance on this, here: https://www.adobe.com/express/discover/sizes/instagram.
Instagram and pretty much every social media app, will process photos & videos based on whatever sizing/cropping/compression/etc rules they've built into the app at that particular moment. Not just your photos, everybody's photos.
Then, they could update the image rules with every new update of the app.
*Not really an answer to the question but interesting in this context:
I was wondering if @Billy Kerr could be right and highly compressed images wont be re-saved and compressed further. Would have surprised me if that would have been the case. But the result is even more surprising than this.
Left before upload: 1080x1080px img compressed at worst quality in photoshop is 32kb.
Right After upload: Now only 14kb size? How is that even possible? They must have some insane compression algorithm or does photoshop add something else to the file that insta removes?