It is possible to upload a better quality and small filesize image in Bluesky, but you'll need a client that supports it. See these screenshots. - default bsky client (and similar forks): converts it to JPEG - custom clients: converts it to WebP https://oyster.us-east.host.bsky.network/xrpc/com.atproto.sync.getBlob?did=did:plc:bpotnohnlgcj3fbmp7ugx4en&cid=bafkreifogksrondouvadgg3h24rhpdhcchwmnxmxgit4skdlxssxqkpuse https://oyster.us-east.host.bsky.network/xrpc/com.atproto.sync.getBlob?did=did:plc:bpotnohnlgcj3fbmp7ugx4en&cid=bafkreickaajkfcpe4tlvqvvmdpadnzhyaxdlpmodxh7wklo6vbldpulr5e