How to Turn One Product Photo Into Square, 4:5 and 9:16 Images Without Stretching the SKU

One good product photo rarely fits every place you need to use it. A square image may work for a marketplace or product grid, a 4:5 version gives you more vertical space for social ads, and a 9:16 version is useful for Stories, Reels and TikTok-style placements.

The common mistake is to solve each format by stretching the image, cropping into the product, or asking AI to regenerate the entire scene. If the SKU is already accurate, there is a safer option: keep the original product pixels fixed and create the extra space around them.

This tutorial shows a simple workflow using canvas resize and generative expansion. The same principle works in Photoroom, Photoshop and other editors that can extend an image beyond its original boundaries.

Step 1: Start from the approved image, not the smallest finished crop

Use the highest-resolution approved image you have. If the photograph has already passed your product-accuracy check, keep that file untouched and make copies for each output format.

For jewellery, verify the clasp, chain, engraving, stones, proportions and metal finish before resizing. For packaging, check the logo, label, cap and printed text. You want to know the product was correct before any new canvas or AI step is introduced.

Avoid starting from a heavily cropped social image if the original photograph still exists. More surrounding background gives the editor better material to extend and gives you more freedom to reposition the composition.

Step 2: Decide the destination before you edit

Create separate versions rather than one compromise image. A useful set is 1:1 for square placements, 4:5 for portrait feeds and 9:16 for full-screen vertical creative.

Do not automatically make the product fill the same percentage of every frame. A 9:16 advert often needs more breathing room above or below the product for copy, while a square listing image may need the item larger and more central. The product should stay the same shape and proportions even when its position within the canvas changes.

Step 3: Try normal canvas resize before generative expansion

If the original background is plain white, a solid brand colour or a simple transparent layer, you may not need generative AI at all. Increase the canvas to the new aspect ratio and fill the extra area with the same background.

Photoroom's Resize tool can change the canvas size and add extra transparent space on its free plan. That is enough for simple catalogue images because you can keep the product layer untouched, reposition it, then use a solid background behind it.

This is the lowest-risk route. Nothing needs to be invented around the product, and the photographed SKU does not need to be redrawn.

Step 4: Use AI Expand only when the background actually needs extending

Lifestyle images are different. If your approved photo shows a bracelet on stone, a bottle on a bathroom shelf or a product on a styled desk, changing a square image into 9:16 creates empty space that needs a believable continuation of the scene.

That is where generative expansion is useful. Photoshop's current Generative Expand workflow lets you drag the canvas outward and generate matching content around the existing image. Adobe specifically describes the feature as a way to expand an image while maintaining its style and context. Leaving the prompt blank asks the model to continue what is already there.

Photoroom also offers AI Expand. Its July 2026 help documentation lists AI Expand among its Free Utilities with daily usage limits, although some older platform-specific help pages still describe automatic AI expansion as a Pro or Business feature. If the option is not available in your account, use normal Resize or another editor rather than building the workflow around a feature you cannot access.

Step 5: Protect the product by expanding outward

The safest selection is the area outside the approved image. Do not select through the product unless you genuinely want it edited.

For example, if a square jewellery lifestyle image needs to become vertical, extend the canvas above and below the existing frame. Let AI create more wall, stone, fabric or empty studio space around the original photograph. The product can remain inside the untouched centre.

If the expanded result changes the product even though you did not ask it to, reject that variation. A nicer composition is not worth losing a correct clasp, label or engraving.

Step 6: Give the new space a job

Extra canvas should not exist only because the format is taller. Use it deliberately.

For a 4:5 ad, you might keep the product slightly lower and leave clean space at the top for a headline. For 9:16, you may want the product in the lower half so text and interface elements have room above. For a square ecommerce image, the same product might sit more centrally with less empty space.

Do not bake important text into the AI-generated pixels if you can avoid it. Add headlines, prices and calls to action as editable text layers afterwards. That makes it easier to correct copy and reuse the same image in another market or campaign.

Step 7: Check seams, shadows and repeated patterns

Generative expansion can fail away from the product too. Look at the boundary between the original photograph and the generated area. Stone veins can suddenly repeat, shelf lines can bend, fabric can change texture and shadows can point in a new direction.

Jewellery needs one extra check because polished metal reflects its environment. If the original bracelet clearly reflects a bright studio on one side, an expanded scene with dramatic side lighting can create a visual contradiction. The background, shadow and product reflections should still tell the same lighting story.

Step 8: Export each format as a derivative, not a new master

Keep the original approved photograph separately. Name the new files by their job, for example SKU123-hero-square.jpg, SKU123-meta-4x5.jpg and SKU123-story-9x16.jpg.

Before publishing, compare the product in every derivative with the original. You should see the same SKU in three different compositions, not three slightly different versions of the product.

If you use Lustra Studio to create the original jewellery scene, the same handoff applies. Approve the product-led image first, then adapt the surrounding canvas for different channels rather than regenerating the jewellery just because the destination has a different aspect ratio.

The takeaway

A different aspect ratio is a layout problem, not automatically a product-generation problem. Start with one approved product image, create separate canvases for square, 4:5 and 9:16, and extend the background only where the new format needs more space.

Use ordinary canvas resize when a solid or transparent background is enough. Use generative expansion for genuine scene continuation. In both cases, keep the product pixels as stable as possible and make the extra space work for the placement. That is faster to review and safer than asking AI to recreate the SKU for every channel.

Sources: Adobe Photoshop Help, “Explore beyond the canvas with Generative Expand,” updated 23 February 2026; Adobe Photoshop Help, “Expand images with generative AI,” reviewed 12 September 2026; Photoroom Help Center, “Daily usage limits,” published 15 July 2026; Photoroom Help Center, “Resize your designs in Photoroom,” current platform guidance reviewed 12 September 2026.