Instagram Re-Encodes Everything You Upload, and That Is an Editorial Decision
The platform's compression pipeline is not infrastructure. It is policy.
What Survives the Upload
Instagram's published export specification caps still images at 1080 pixels on the longest edge for square and landscape frames; portrait images fare slightly better at 1080 × 1350. A file uploaded at full resolution from a 61 MP Sony or a 40 MP Fujifilm body is resampled and recompressed before a single follower sees it. The quality floor is a JPEG at around 70–85% quality depending on content complexity — Instagram has never published a precise figure, and the actual output varies. What does not vary is the ceiling.
EXIF retention is partial and selective. Capture date, camera model, and focal length sometimes persist in the encoded output; GPS coordinates are stripped by default, which Instagram presents as a privacy feature. Colour profile handling is where the pipeline does its most consequential work: images uploaded in sRGB fare better than those tagged with Adobe RGB or Display P3, because the platform converts anything outside sRGB to its own colour space before serving — a conversion that flattens saturation in ways the photographer did not choose and cannot reverse after upload. The sRGB standard, maintained by the IEC, defines a narrower gamut than the wide-colour profiles many current cameras and monitors now support natively.
None of this is technically surprising. Every major distribution platform applies some form of transcoding; bandwidth economics demand it. What makes Instagram's choices editorial rather than merely technical is their specificity. The 4:5 portrait crop, the 1080-pixel ceiling, the sRGB conversion — each is a decision about which visual information is worth carrying, and which is not. The photographer is not consulted.
The C2PA Content Credentials standard exists precisely because the industry recognised that distribution pipelines strip provenance. Camera makers including Sony and Leica have implemented the standard in firmware, embedding cryptographic records of capture metadata into files at the sensor level. Instagram does not currently preserve C2PA credentials through its compression pipeline. Once the image is uploaded, the chain of custody is broken.
That break is not an accident of engineering. Retaining credentials would require Instagram to make a deliberate choice to pass them through. It has not made that choice, which is itself a decision about whose record of an image is authoritative. The platform's version survives. The photographer's does not.
