Free AI image upscaler · online
Free AI image upscaler — 4K, 8K or up to 128 MP
Turn small, soft or pixelated pictures into big, sharp files. Seven AI engines in one tool — from a fast Real-ESRGAN upscale to 128 MP prints and old-photo restoration. No watermark, no subscription required.
- No watermark
- 2K, 4K, 8K or up to 128 MP
- Photos, AI art & anime
- 7 AI engines
Updated by the Kenerate AI team
On this page
Quick answer
What is an AI image upscaler?
An AI image upscaler is a tool that makes a picture bigger and sharper by rebuilding edges and texture instead of just stretching the pixels. Kenerate AI's upscaler runs online with seven engines, from fast Real-ESRGAN to Clarity Pro for creative detail, and outputs up to 8K or 128 MP. It is free to start, with no watermark.
Key facts
- Speed
- About 15–80 seconds per image
- Free to start
- Starter credits on sign-up, no watermark
- Max size
- 8K, or up to 128 MP
- Engines
- 7: Real-ESRGAN, Image Upscaler, Kenerate Upscale, Ultimate, Clarity Pro, Phota Enhance, Recraft Creative
How it works
How to upscale an image with AI
Three steps and usually under a minute.
- Time needed
- Steps
- 3 steps
Step 1
Add an image
Upload a JPG, PNG or WEBP up to 25 MB — a photo, a product shot, a screenshot or AI art — or try one of the samples.
Step 2
Pick an engine and a size
Real-ESRGAN is the fast default. Choose Image Upscaler for 2K, 4K or 8K, Kenerate Upscale for an exact size up to 128 MP, Clarity Pro to add new detail, or Phota Enhance to repair old and blurry photos.
Step 3
Compare and download
Drag the slider to check the result against the original, then download it — no watermark. Send it on to Edit Studio or the background remover if you need to.
See it in the app
Open Image Upscaler and upload a photo, or pick one from your library or a link.
Watch the tour · 1:47
7 engines, 2K · 4K · 8K & exact size, portraits, old-photo restore, before/after & chat
Chapters
Real results
What can an AI upscaler fix?
Every card is a real Kenerate output from the bad input shown in the slider above. Tap one to try the same image.
Before · 300 px JPEGAfter · 4K · 3664 × 4579
Tiny photos
A 300 px portrait to 4K without the mushy look of a normal resize.
Image Upscaler
Try this photo
Before · 720 px, out of focusAfter · 2048 px, sharp
Before · Scanned printAfter · Restored · 2400 px
Before · 360 px JPEGAfter · 4K · 4730 × 3547
Before · 300 pxAfter · 1832 × 2290
At 100%
What does an AI image upscale look like at 100%?
Zoomed in on the same area: the original simply stretched, next to the real Kenerate result.
Engines
Which AI upscaler engine should I use?
Seven engines, one tool. Start with Real-ESRGAN, the fast default, and switch only when the picture needs it — quick picks by job are below the cards.
Open source
Real-ESRGAN
- Style
- Faithful
- Speed
- About 25 s
- Output
- 2048 px
Open Real-ESRGANBest for
Quick clean-ups of small AI renders, web images and product shots (under 2048 px).
Kenerate AI
Kenerate Upscale
- Style
- Faithful
- Speed
- About 14 s
- Output
- Up to 128 MP
Open Kenerate UpscaleBest for
E-commerce and design assets at a precise size, fast.
WaveSpeed
Image Upscaler
- Style
- Faithful
- Speed
- About 45 s
- Output
- 2K · 4K · 8K
- Size
- 2048+ px, 4096+ px, 8192+ px
Open Image UpscalerBest for
Everyday photos and AI art to a standard 2K, 4K or 8K size.
WaveSpeed
Ultimate Upscaler
- Style
- Faithful
- Speed
- About 19 s
- Output
- 2K · 4K · 8K
- Size
- 2048+ px, 4096+ px, 8192+ px
Open Ultimate UpscalerBest for
Marketing assets and photo restoration where fine detail matters.
Clarity AI
Clarity Pro
- Style
- Creative
- Speed
- About 81 s
- Output
- Up to 64 MP
Open Clarity ProBest for
Campaign visuals and artwork for print. On faces keep creativity low — higher values can change the person.
Kenerate AI
Phota Enhance
- Style
- Restore
- Speed
- About 37 s
- Output
- 2048 px
Open Phota EnhanceBest for
Old family photos, archives and low-res pictures you want to print.
All models (7)
Recraft
Recraft Creative
- Style
- Creative
- Speed
- About 29 s
- Output
- 4096 px
Open Recraft CreativeBest for
Portraits and product shots that need richer texture.
Choosing
Faithful vs creative upscaling
A faithful upscaler adds pixels and sharpens what is already there, so the picture stays the same picture. A creative upscaler uses a generative model to paint in new fine detail. That can look stunning — see the pixelated dahlia below, rebuilt from a 112-pixel original — but it is new detail, not recovered detail, so use it for art and marketing rather than evidence, documents or product labels.
Quick picks by job
- Everyday photos, screenshots, web images → Real-ESRGAN. The default. Fast (about 25 s) and faithful.
- A fixed size like 4K or 8K → Image Upscaler. Pick 2K, 4K or 8K; good for wallpapers, slides and prints.
- An exact print size → Kenerate Upscale. Choose 4 to 128 megapixels; the tool shows the pixel size your image will come out at.
- Portraits and campaign visuals that need extra detail → Clarity Pro. The creativity dial goes from “stay true” (−10) to “invent detail” (+10). Keep it low for faces.
- Old, blurry, grainy or damaged photos → Phota Enhance. It repairs as well as enlarges. See photo restoration.
- Skin, hair and fabric that look flat → Recraft Creative. A texture pass that outputs 4096 px.
Just need one picture bigger? The upscale image guide covers 2× vs 4× and print sizes, and upscale image to 4K opens the tool on the 4K setting.
Look closer
A 112-pixel flower, rebuilt
Clarity Pro at creativity +6 on a heavily pixelated macro. The petals and droplets are new detail painted in by the model — the right tool when you want a beautiful image, not an exact one.
- Blocky pixels turned into smooth petals
- Droplets and veins added by the model
- Keep the creativity dial low when accuracy matters
Popular jobs
What people upscale
Upscale image
2×, 4×, 4K or an exact size
AI image enhancer
Blur, grain and low-res, fixed
HD photo converter
Any photo to HD, 4K or 8K
Photo restoration
Old and damaged prints
Enhance AI art
Midjourney & SD renders
Remove the background
Then upscale the cut-out
Edit Studio
Layers, text, AI edits
Video upscaler
Upscale video to 4K
Checked 26 September 2026
Online AI upscaler vs desktop app vs Photoshop vs a normal resize
Four ways to make an image bigger, and what each one is good at.
| Kenerate AI · this tool | Upscayl · free desktop app | Photoshop · Camera Raw Super Resolution | Normal resize · Paint, Preview, Canva | |
|---|---|---|---|---|
| Adds detail | Yes — 7 AI engines | Yes — AI models | Yes — 2× only | No, just blurs |
| Max size | 8K or 128 MP | Set by your GPU memory | 2× width and height | Any, but soft |
| Needs | A browser | Install + a Vulkan GPU | A Photoshop plan | Nothing |
| Old-photo repair | Phota Enhance | No | No | No |
| Creative detail | Clarity Pro, Recraft | No | No | No |
Upscayl requirements from its GitHub README; Photoshop Super Resolution doubles the width and height of a photo in Camera Raw. More choices on the Topaz Labs alternative, Magnific alternative and Artguru alternative pages.
Sources: Real-ESRGAN (Wang et al., 2021) — GitHub · Super-resolution imaging — Wikipedia
Example uses
How people use the upscaler
Three common jobs, with the real before and after.
Illustrative examples of typical workflows, not customer reviews.
Online seller
Supplier photos arrive at 320 px. A quick Real-ESRGAN pass makes them big enough for zoom-on-hover without re-shooting the product.
Try this workflow
Family historian
Scans grandparents' prints once, then runs each one through Phota Enhance to remove scratches and fading before printing copies for the family.
Try this workflow
Café owner
The only photo of the old chalkboard menu was a tiny web image. Upscaled to 4K, it is sharp enough for a printed poster.
Try this workflow
FAQ
AI image upscaler questions
12 questions
Is the Kenerate AI image upscaler free to use online?
It is free to start online: new accounts get free credits on sign-up to test the engines on your own images. Bigger jobs use one-time credit packs that never expire — no subscription required, no watermark.
Link to this answerWhat is the best free AI image upscaler?
It depends on the picture, so Kenerate puts three kinds of engine in one tool you can start free. For everyday photos, screenshots and AI renders, a faithful engine such as Real-ESRGAN or Image Upscaler is best because it keeps the image as it is. For faces and campaign visuals that need extra fine detail, use a creative upscaler like Clarity Pro. For old, blurry or damaged photos, use Phota Enhance.
Link to this answerHow big can I upscale an image?
Image Upscaler and Ultimate output 2K, 4K or 8K. Kenerate Upscale lets you pick an exact size from 4 to 128 megapixels, and Clarity Pro goes up to 64 megapixels.
Link to this answerDoes upscaling add real detail?
A faithful upscaler rebuilds edges and textures that are implied by the pixels you already have, so the result looks sharper than a normal resize. It cannot recover detail that was never captured. Creative engines (Clarity Pro, Recraft) can invent new fine detail — which looks great but may change small things like skin texture or tiny text, so check the result.
Link to this answerWhich upscaler should I use for faces?
Start with Image Upscaler or Real-ESRGAN, which keep the face as it is. If the photo is old or out of focus, use Phota Enhance. Clarity Pro adds the most detail but, with the creativity dial high, it can change features — keep it near 0 for portraits.
Link to this answerCan I upscale anime and illustrations?
Yes. Real-ESRGAN keeps clean line art and flat colours, which is what you want for anime, manga, logos and cartoons.
Link to this answerWhat file types can I upload and download?
Upload JPG, PNG or WEBP up to 25 MB. Most engines let you download PNG, JPG or WEBP.
Link to this answerIs there a watermark?
No. Results from free and paid credits are the same clean file.
Link to this answerCan I use the upscaled images commercially?
Yes, as long as you have the rights to the original image. You own your results.
Link to this answerHow long does it take?
About 15 to 80 seconds depending on the engine: Kenerate Upscale is the fastest (~14 s), Real-ESRGAN about 25 s, Clarity Pro about 80 s.
Link to this answerWhich AI upscaler engine is best for 4K?
Image Upscaler is the simplest choice for 4K: pick 4K and it outputs at least 4096 px on the long side, in your photo's own shape. Ultimate Upscaler also offers 2K, 4K and 8K and suits marketing assets and restoration where fine detail matters. For an exact print size, Kenerate Upscale takes a megapixel target instead.
Link to this answerAre AI image upscalers generative AI?
Some are and some are not. Faithful engines such as Real-ESRGAN, Image Upscaler and Kenerate Upscale are neural networks trained to rebuild the edges and texture your pixels imply, so the picture stays the same picture. Creative engines such as Clarity Pro and Recraft Creative are generative: they paint in new fine detail, which can change small things like skin or tiny text.
Link to this answerIn depth
How AI image upscaling works
From bicubic resizing to Real-ESRGAN and diffusion upscalers — what actually happens to your pixels, with sources.
On this page
Why a normal resize makes pictures blurry
Classic resizing — nearest-neighbour, bilinear, bicubic (Keys, 1981) and Lanczos (Duchon, 1979) — creates each new pixel as a weighted average of the pixels around it [1][2]. No new fine detail is created, so when you enlarge, edges are simply spread across more pixels and the image looks soft. Nearest-neighbour keeps hard edges but turns curves into visible blocks; Lanczos is sharper than bicubic but can add halos (ringing) along edges [3].
There is also a hard limit: a sampled image only holds detail up to half its sampling rate (Shannon's sampling theorem) [4]. Many different sharp images shrink to the same small one, so any upscaler has to choose a plausible answer rather than recover the true one.
How AI super-resolution learned to add detail
SRCNN (Dong, Loy, He and Tang, ECCV 2014) is widely cited as the first deep-learning super-resolution network: one small convolutional network learns the whole mapping from low- to high-resolution [5]. SRGAN (Ledig et al., CVPR 2017) added a perceptual loss and an adversarial (GAN) loss and produced the first photo-realistic 4× results [6]; ESRGAN (Wang et al., 2018) improved it and won the PIRM2018 super-resolution challenge — while noting that GAN-hallucinated details can come with artefacts [7].
Real-ESRGAN (Wang, Xie, Dong and Shan, ICCV Workshops 2021) — the default engine in Kenerate's upscaler — was trained on synthetic “high-order” degradations: blur, noise, resizing and JPEG compression applied, then applied again, so it copes with messy real-world photos instead of clean lab images [8]. It is open source under the BSD-3-Clause licence and has a smaller model tuned for anime [9].
Faithful vs creative: the perception–distortion trade-off
Blau and Michaeli (CVPR 2018) proved that no restoration method can be both maximally faithful to the true pixels and maximally natural-looking — improving one eventually costs the other [10]. That is why Kenerate offers both kinds of engine.
Faithful engines (Real-ESRGAN, Image Upscaler, Kenerate Upscale, Ultimate) stay close to the input. Creative engines are closer to diffusion upscalers such as Stability AI's SD x4 upscaler [11], StableSR [12] and SUPIR [13], which regenerate detail from a learned image prior; StableSR even exposes a single dial to balance quality and fidelity — the same idea as Clarity Pro's creativity slider.
Why upscaled faces and text need a second look
In June 2020 the PULSE face “depixelizer” (Menon et al., CVPR 2020) turned a pixelated photo of Barack Obama into a white man, because it searched a face generator for any face that matched the pixels — not the real person [14][15]. In 2024 a Washington State court excluded AI-“enhanced” video from a criminal trial, finding it showed what the model “thought should be shown” [16].
The lesson for everyday use: AI upscaling is excellent for making photos, products and artwork look better, but it is not evidence. Keep faithful engines for anything factual, compare faces and text at 100%, and keep your original file.
By the Kenerate AI teamLast updated and reviewed
We build and run the Kenerate image upscaler; every example on this page is a real output of the tool from the input shown.
Sources: Real-ESRGAN (Wang et al., 2021) — GitHub · Upscayl — GitHub README · Adobe — Super Resolution in Camera Raw
Upscale your first image free
Free credits on sign-up. No watermark, no subscription required.
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