Photoshop Generative Fill: Low Resolution Fix!
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Generative Fill resolution in Photoshop tops out at 1024 pixels on the longest side, so the fill it generates looks pixelated once Photoshop stretches it across a larger image.
Photoshop’s Generative Fill is an incredible tool, but there’s an issue – the noticeable difference in resolution between the original photo and the generated pixels.
This discrepancy occurs because Generative Fill generates content that’s only 1024 pixels on the longest side. Photoshop stretches that content across the entire image, which causes the pixelation.
However, there’s a way to solve this problem. Let’s explore the solution through clear and simple steps.
Note: The video was recorded in the Photoshop Beta, when Generative Fill first shipped with its 1024 by 1024 pixel cap. Photoshop 27.3 (Photoshop 2026), the January 2026 release, doubled that cap to 2048 by 2048 pixels for Generative Fill, Generative Expand, and the Remove Tool. That cut this pixelation gap roughly in half.
Key Takeaways
- Generative Fill resolution in Photoshop caps out at 1024 pixels on the longest side, no matter how large your selection is.
- A blank prompt tells Generative Fill to match the pixels around the selection instead of adding something new.
- A 10-pixel overlap between fills, not a full 1024-pixel gap, keeps the seams from showing.
- Typing HD, 4K, or 8K into the prompt has no effect on the output size.
- Filling a large area in 1024 by 1024 pieces looks noticeably sharper than filling it all in one pass.
- Photoshop 27.3 raised the built-in cap to 2048 by 2048 pixels, cutting this pixelation gap roughly in half.
Table of contents
- What You Will Learn
- Requirements
- Why Are Photoshop Gen Fill Images Low Res?
- Step 1: Increase Canvas Size
- Step 2: Add Extra Space
- Step 3: Generate Selection
- Step 4: Apply Generative Fill
- Step 5: Repeat the Process
- Step 6: Apply the Solution Throughout
- Frequently Asked Questions
- Generative Fill Resolution in Photoshop: Final Thoughts
- Related Links
What You Will Learn
- How to calculate a canvas expansion with a 10-pixel overlap
- How to type equations directly into Photoshop’s numeric input fields
- How to set the Rectangular Marquee tool to a fixed 1024 by 1024 size
- How to run Generative Fill with a blank prompt to blend new pixels seamlessly
- How to repeat the process across an entire image without visible seams
Requirements
Before you start
- Photoshop 2024 (version 25.0 or later) or the current version
Why Are Photoshop Gen Fill Images Low Res?
Zooming into an area filled by the Generative Fill reveals the resolution disparity.
The fill generates content that is only 1024 pixels on the longest side, which is then stretched across the entire image.
To illustrate, consider a blue square measuring 1024 by 1024 pixels.
When this square is stretched to fit the image, the low resolution becomes evident.
Note: Typing HD, 4K, or 8K in the prompt will not work.
Step 1: Increase Canvas Size
To solve the low-resolution problem, we can add extra space to the image piece by piece. Go to Image > Canvas Size.
Tip: You can type equations directly into Photoshop’s numeric input boxes, including the Canvas Size box.
Step 2: Add Extra Space
In the canvas size box, input “+1024” (or another desired value) to add 1024 pixels to the desired side of the image.
Tip: If you’re expanding the canvas to add new scenery instead of patching resolution, try Generative Expand instead. It fills the new canvas space in one step, without any manual math.
For a better result, it’s recommended to add a slight overlap, such as 1014 pixels, to avoid visible seams and achieve improved results.
Click on the icon to add the extra space to the left of the image.
You can also check the “Relative” box and input 1014, though it’s not available in all input boxes and lacks division and multiplication functionalities.
Step 3: Generate Selection
Press OK, and the image will now have the additional 1014-pixel-wide space to the left.
Select the Rectangular Marquee tool and choose “Fixed Size” under style.
Set the size to 1024 by 1024 pixels. Click on the top-left corner and Photoshop will generate a 1024 by 1024 selection. Note the 10-pixel overlap, which was accounted for in the previous step.
Step 4: Apply Generative Fill
With the selection in place, click on Generative Fill.
Leave the prompt blank and click on “Generate.”
Photoshop will apply the Generative Fill to the selected area.
Step 5: Repeat the Process
Return to the Rectangular Marquee tool and repeat the process to complete the left side of the image.
By generating the fill piece by piece, you’ll achieve significantly better results compared to generating it over the entire image at once.
Step 6: Apply the Solution Throughout
Continue applying this process to the other side or any additional areas where you want to fix the low-resolution issue.
This isn’t a bug. It’s a result of Adobe testing Generative Fill‘s resolution in the Photoshop Beta.
Frequently Asked Questions
Generative Fill resolution in Photoshop tops out at 1024 pixels on the longest side, and Photoshop stretches that fill to cover the rest of your selection. On Photoshop 27.3 or later, the cap doubled to 2048 by 2048 pixels, so the stretch is smaller and the result looks sharper.
Generative Fill ignores resolution words like HD, 4K, or 8K. The output size is fixed by the model itself, not by anything you type in the prompt.
Adding 1014 pixels instead of a full 1024 pixels leaves a 10-pixel overlap between each fill. That overlap keeps the seams between the pieces from showing.
Yes. Photoshop’s numeric input boxes, including the Canvas Size box, accept equations like +1024. Typing the equation is faster than doing the math yourself first.
A blank prompt tells Generative Fill to match the pixels already around the selection instead of adding something new. That keeps each piece consistent with the rest of the photo.
Use Generative Fill when you need to add or replace pixels inside a selection. Use the Remove Tool when you want to erase an unwanted object instead, since it skips this resolution workaround entirely.
Not as much as it used to be. Photoshop 27.3 raised the built-in cap to 2048 by 2048 pixels, cutting the original pixelation gap roughly in half.
Generative Fill Resolution in Photoshop: Final Thoughts
Generative Fill‘s original resolution cap made this workaround necessary, and repeating the fill in 1024 by 1024 pieces still closes most of that gap today.
Photoshop 27.3 already cut the gap roughly in half by raising the built-in cap to 2048 by 2048 pixels. For an even sharper single-pass result, try a stronger partner AI model like Nano Banana or Flux Context Pro inside Generative Fill.
Watch the video above for the full walkthrough, and comment on the video if a seam still shows through.
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