ON1 Resize AI

Snapshot Verdict

ON1 Resize AI is a specialized tool that uses machine learning to upscale images without the customary blur and pixelation of traditional interpolation. It is a one-trick pony, but it performs that trick with remarkable precision. While it excels at recovering detail in low-resolution photos and preparing small files for large-scale printing, its interface feels antiquated and its performance is heavily dependent on your computer's hardware. It is a solid choice for photographers and print professionals, but likely overkill for the casual user who only needs occasional social media resizing.

Product Version

Version reviewed: 2023.5 (Build 17.5.1)

What This Product Actually Is

ON1 Resize AI is a dedicated image enlargement software that replaces the old-school "Genuine Fractals" technology with modern neural networks. Its primary goal is to take a small image and make it large while manufacturing "missing" data to keep edges sharp and textures realistic.

When you enlarge a photo in standard software, the computer looks at existing pixels and guesses what should go between them. This usually results in a soft, muddy image. ON1 Resize AI has been trained on millions of examples of textures—like skin, fabric, and tree bark—so it doesn't just guess; it reconstructs. It can be used as a standalone application or as a plugin for Adobe Photoshop, Lightroom, and Capture One.

Beyond simple upscaling, it includes tools for "Gallery Wraps" (adding margins for canvas printing) and tiling (splitting a massive image into smaller sections for home printing). It is a utility designed for the end of the workflow: the moment a digital file needs to become a physical object or a high-resolution asset.

Real-World Use & Experience

Using ON1 Resize AI is a tale of two experiences. The results are often stunning, but getting to those results can feel like a chore. When you first drop an image into the workspace, the software has to "render" the AI preview. On a mid-range laptop, this takes several seconds every time you pan or zoom. This lag creates a disconnect between your actions and the visual feedback.

The interface is dense. It follows the traditional photography software layout with collapsible panels on the right and a toolbar on the left. For a beginner, the sheer number of sliders for "Sharpening," "Grain," and "Smoothing" can be intimidating. The software assumes you know why you are there. It does not hold your hand.

However, once you dial in the settings, the transformation is undeniable. A 12-megapixel smartphone photo can be pushed to 400% or 600% its original size and remain printable. It handles "mushy" details—like distant grass or hair—better than traditional methods, though it can occasionally create "artifacts" or strange repeating patterns if pushed too hard.

The batch processing feature is the unsung hero. If you have a folder of old 2000-era digital photos, you can point the software at the folder and let it work in the background. It is slow, but the output is consistently better than anything you could achieve manually in Photoshop.

Standout Strengths

• Exceptional edge definition in enlargements.
• Natural texture reconstruction in portraits.
• Excellent batch processing for high volumes.

The primary strength is the "cleanliness" of the upscale. In our testing, the AI does a fantastic job of identifying what should be a sharp edge (like a mountain ridge) and what should be soft (like a bokeh background). It avoids the "halo" effect often seen in over-sharpened images.

The integration as a plugin is seamless. Being able to right-click a photo in Lightroom and send it directly to Resize AI saves a massive amount of time in a professional workflow. You don't have to manage separate file versions manually; the software handles the round-trip and brings the enlarged TIFF or PSD back into your catalog automatically.

Lastly, the specialized print tools are better than those found in general-purpose editors. The Gallery Wrap feature, which mirrors the edges of your photo so you don't lose the subject when wrapping around a wooden frame, is a massive time-saver for anyone selling physical prints.

Limitations, Trade-offs & Red Flags

• Significant hardware and GPU requirements.
• Frequent lag during live preview.
• Occasional "painterly" artifacts on faces.

The most glaring issue is the performance. This is not a "light" app. If you do not have a dedicated graphics card (GPU) with at least 4GB of VRAM, you will spend a lot of time staring at progress bars. Even on modern machines, the AI models take time to compute. It is not an instantaneous experience.

There is also the "uncanny valley" of AI upscaling. Sometimes, the software tries too hard to find detail where there is none. In some portraits, we observed the AI turning skin pores into a strange, cobblestone-like texture or making eyes look unnaturally sharp compared to the rest of the face. You have to be careful with the "Amount" slider to keep things looking photographic rather than like a digital painting.

The software also feels somewhat bloated. ON1 tries to bundle "extras" like basic cropping and some color adjustments, but these are better handled in your primary editor. These extra features clutter the UI and distract from the core mission of the tool: resizing.

Who It's Actually For

This tool is specifically for people who need to print large. If you are a landscape photographer wanting to turn a cropped shot into a 40-inch wide metal print, this is a necessary part of your kit.

It is also invaluable for archivists. If you are scanning old family 4x6 prints or 35mm slides and want to see them on a 4K monitor without seeing every individual pixel grain, Resize AI does a better job of "cleaning" those images than almost any other tool.

It is not for social media managers or casual Instagram users. Most social platforms downscale your images anyway, so using a high-end AI upscaler before posting a selfie to a 6-inch phone screen is a waste of time and money.

Value for Money & Alternatives

ON1 Resize AI is usually priced as a perpetual license, which is a breath of fresh air in an industry dominated by monthly subscriptions. However, they do release paid upgrades annually, so you may find yourself wanting to pay again in 12 to 18 months for the latest AI models.

If you already own the full ON1 Photo RAW suite, Resize AI is included, making it a great value. As a standalone purchase, it is a significant investment for a single-purpose utility. You are paying for the precision of the algorithm, not the breadth of the features.

Value for money: fair

Alternatives

• Topaz Photo AI — Faster performance and better automated noise reduction, but more expensive.
• Gigapixel AI — Similar specialized focus on resizing with a slightly more modern interface.
• Adobe Photoshop (Super Resolution) — Included in Creative Cloud; decent results but lacks the fine control of ON1.

Final Verdict

ON1 Resize AI is a powerful, if somewhat clunky, professional utility. It solves a very specific problem—low resolution—with high-end math. While the user interface feels a decade behind and the hardware demands are steep, the output quality justifies the friction for those who need physical prints or high-res assets. It is a workhorse, not a toy. If you have the patience for its slow previews and the hardware to back it up, it will save images you previously thought were too small to be useful.