CivArchive
    4x-Ultrasharp - 4x-UltraSharp v1.0
    Preview 1720944

    Check my EXCLUSIVE models on Mage.Space: AniMage PXL • AniReal PXL • Lucid Dream • AniMage SD1.5 • Realistic Portrait
    SDXL - Pony: AniVerse PXL • AniMerge PXL • AniToon PXL • AniMics PXL • AniVerse XL
    SD1.5: AniVerse • AniThing • AniMerge • AniMesh • AniToon • AniMics

    Also in Collaboration with Shakker.ai

    This upscaler is not mine, all the credit go to: Kim2091

    Official WiKi Upscaler page: Here

    License of use it: Here

    HOW TO INSTALL:

    Rename the file from:

    4x-UltraSharp.pt to: 4x-UltraSharp.pth

    Copy the file 4x-UltraSharp.pth inside the folder: "\YOUR~STABLE~DIFFUSION~FOLDER\models\ESRGAN\")

    Restart you Stable Diffusion

    Now in "Extra Tab" you got the new upscaler

    Description

    This upscaler 8s not mine, all the credits go to: lokCX

    FAQ

    Comments (77)

    modzhahead158Jul 25, 2023
    CivitAI

    what is the difference from the upscaler with the same name?

    Samael1976
    Author
    Jul 25, 2023

    There is already here? If yes, I delste mine... Because I search it and I have not find it

    knxoJul 25, 2023· 1 reaction

    @Samael1976 Searching for the checksum doesn't return anything other than this one: A5812231FC

    Samael1976
    Author
    Jul 25, 2023· 1 reaction

    @knxo I think it's different one!

    nova1337Jul 25, 2023· 7 reactions
    CivitAI

    just letting you know lokCX is not the author of the model, Kim2091 is as stated here https://huggingface.co/lokCX/4x-Ultrasharp/discussions/1 and this is the official upscale community wiki where it's hosted https://upscale.wiki/wiki/Model_Database#Universal_Models

    Samael1976
    Author
    Jul 25, 2023

    Hi Nova, my english is not very good (sorry, I'm italian).

    If you are sure that is the same and I'm violating the license (or if I need to change the credits).

    Let me know if I must delete the file here or if I must change the credits.

    With simply words please 😓

    EDIt: I change the credits to Kim2091

    nova1337Jul 25, 2023· 1 reaction

    @Samael1976 im not 100% sure on the legality, but according to this (which kim linked) you are technically in violation as well (https://creativecommons.org/licenses/by-nc-sa/4.0/)

    1. the file was modified without same license attached to it

    2. no credit was given to the original author

    so if you re upload the .pth instead of pt and credit kim as the original author with link to the official wiki i don't think she would mind :D

    Samael1976
    Author
    Jul 25, 2023

    @nova1337 Ok, thank you! I've already changed the credit and linked to the original author (Kim), now I go to put the link of the original wiki in the description.

    Thank you so much!

    Samael1976
    Author
    Jul 25, 2023

    @nova1337 PS Sadly Civitai don't permit to upload pth files, so it need to rename it in .pt

    nova1337Jul 25, 2023· 1 reaction

    @Samael1976 your welcome <3, love your models btw :)

    nova1337Jul 25, 2023

    "PS Sadly Civitai don't permit to upload pth files, so it need to rename it in .pt" ah okay and you cannot attach the same license as kims model uses? if not it should still be fine, know for a fact kim is a very understanding person

    Samael1976
    Author
    Jul 25, 2023· 1 reaction

    @nova1337 I can link the license of use in the description :)

    I hope that it's ok

    Samael1976
    Author
    Jul 25, 2023· 1 reaction

    @nova1337 Thank you so much! I'm training an update version of Aniverse right now ;) (50 hours of training, but I really don't know how it will coming out... It's a try...)

    513820Jul 25, 2023
    CivitAI

    I have to go look for 2x upscalers, sometimes 4x is too much! Would love to find a 2x Siax, that one is fire!

    OneViolentGentlemanJul 26, 2023· 1 reaction

    Umm, you don't have to upscale 4x with this. You can just do 2x. I'm usually using 512 by 768 and upscale 2.5x

    513820Jul 26, 2023

    @OneViolentGentleman I don't have a node to set the upscale amount, never really liked a1111

    unstablestDiffuserJul 26, 2023

    @MysteryWrecked isn't there a node do scale down the image after upscaling?

    513820Jul 28, 2023

    @unstablestDiffuser Yes, but it can add distortion. If you scale something up and down a few times it will turn into mashed potatoes. My 22MB jpegs look great though lol!

    bruh776Nov 29, 2023· 1 reaction

    @MysteryWrecked if you didn't like a1111's UI before there are now themes you can install, so its pretty convenient

    MigelAngelECJul 26, 2023
    CivitAI

    How to install on Invoke IA 3.0.0 ?

    Samael1976
    Author
    Jul 27, 2023

    I never used invoke... Maybe the same? I really don't know, sorry!

    MangousteAIAug 7, 2023
    CivitAI

    Hi. Is this upscaler recommended with Anime Flat style models?

    Samael1976
    Author
    Aug 7, 2023· 1 reaction

    for all kind of images

    MangousteAIAug 7, 2023

    @Samael1976 Ok thanks

    Samael1976
    Author
    Aug 7, 2023

    @MangousteAI you are welcome ;)

    amazingbeautyDec 23, 2023

    @Samael1976 not true.

    George1892Sep 9, 2023
    CivitAI

    Question about the License:

    it says we can't use the Licensed Material and Licensed Elements for commercial purposes. Does this mean we can't use the pics we create and then upscale with this upscaler for commercial purposes? Or does it mean we can't use the Upscaler itself for commercial purposes (like selling the Upscaler data online for profit)?

    If anyone could give me clarification on it, i'd be very thankful.

    Samael1976
    Author
    Sep 9, 2023

    Any commercial use of my templates, without my express consent, is prohibited. I evaluate request by request. I'll give you a practical example. I granted free commercial use to a startup (two guys) that is designing a video game (without any funding or manufacturer behind it). Or to a guy who wanted to produce prints for his etsy shop. While for for-profit use (such as a site that generates images for a fee) I have requested small monthly support via my Ko-fi page. So, write to me at samuele[dot]bonzio[at]gmail[dot]com explaining the use you would make of my model, you'll see that we will find a solution. :)

    (the upscaler are not mine, so they follow the license of use of their respective authors)

    Samael1976
    Author
    Sep 9, 2023

    Edit: I saw later that you are talking about only the upscaler and not my models. So like I wrote, the upscaler are not mine, I reported only the commercial of use of they respective author. Talk with them using the link.

    TomLucidorOct 14, 2023
    CivitAI

    Has anyone tried to use ComfyUI with this?

    Samael1976
    Author
    Oct 14, 2023

    Sorry, I don't know... I'm not a Comfy user

    A1322Oct 16, 2023· 1 reaction

    There's no difference.

    trevizanzanNov 10, 2023
    CivitAI

    There is a way to have this upscaler in the Hires. fix tab?

    Samael1976
    Author
    Nov 10, 2023

    I think yes, but you must set in setting tab

    frenzygr595Feb 28, 2024

    did you find out how?

    gbfireNov 28, 2023
    CivitAI
    how to run 4x-Ultrasharp without stable diffusion
    Samael1976
    Author
    Nov 29, 2023· 1 reaction

    I don't think it's possible. But there is a free great tool for windows for upscale.

    https://www.upscayl.org/

    gbfireNov 29, 2023

    @Samael1976 I have it on my laptop but it takes too long, setting up my laptop is not enough

    Samael1976
    Author
    Nov 30, 2023

    @gbfire you need a nvidia GPU

    bledrok7152Jan 30, 2024· 1 reaction

    @Samael1976 There's another freeware called Cupscale, on GitHub

    Samael1976
    Author
    Jan 31, 2024

    @bledrok7152 i will try it. Thank you

    prashanthkumarmanthena195Mar 29, 2024

    For me it's not working in Stable Diffusion, Getting Some Errors

    busses0_epicFeb 18, 2024
    CivitAI

    How many upscale rounds?

    yinquest11Mar 27, 2024· 2 reactions
    CivitAI

    how if i cant find ESRGAN file

    KulgarMar 28, 2024

    the folder? just make one

    jan_nasaMar 29, 2024· 7 reactions

    put it in upscale_models (on comfyui anyway)

    SodiumDSep 3, 2024

    @jan_nasa This just saved me HOURS of headaches. I'm sick of following instructions filled with bad information or presumptive information. Thank you!

    RsmbGrantApr 22, 2025

    @SodiumD right like wtf. anyways i made an upscale_model folder and still issues. let me reload and see if anything changes

    RsmbGrantApr 22, 2025

    Anyone still having issues (install missing nodes), then you have to make the folder upscale_models , then download the upscale model, THEN remember to re select the correct one in the " load upscale model" node. this was my issue my file was not the same name as OP slightly different even though same model. so just reselect and should be good.

    logustusApr 6, 2024
    CivitAI

    I ran into a problem with trying to use this upscaler:

    ```
    Error occurred when executing UpscaleModelLoader: Weights only load failed. Re-running torch.load with weights_only set to False will likely succeed, but it can result in arbitrary code execution.Do it only if you get the file from a trusted source. WeightsUnpickler error: Unsupported operand 80

    ```

    So this means the upscaler is demanding to be run in such a state that it can run anything on your computer. Kim2091 is the original author of this model and you can find this model here: https://huggingface.co/Kim2091/UltraSharp/tree/main

    I have taken SHA256s of the two files:
    Samael1976:

    sha256-pYEiMfyTa0KvCKXtunhBlUldMD1bMkjCRInvDEAh/gE=
    Kim2091:

    sha256-weKbF1v8Yi1+8r/eagg6FWJ5QFdFmmTLXZlJFQdFiIU=

    They are different, which means this model is not the exact same copy of Kim2091's. This could just be an older version of Kim's, or it could be something fishy is going on. I try to keep an open mind and so I went to verify.

    Samael's copy is about 10 months old at time of writing (2024-04-05) but Kim's most recent version is 3 months old. Perhaps it just needs an update. Unfortunately I cannot see history in the git repository that goes back that far to verify. If updated, I do expect those SHAs should match.

    Using the latest version did not work around the issue I had above, so maybe it's okay but it's still hard to do full audits on these things. I have not done a full audit here.

    Samael1976
    Author
    Apr 6, 2024

    Hi, I got some errors me to with A1111 version 1.7.0. I installed a new fresh install 1.8.0 and the error disappeared.

    The new version of Kim is working dor you?

    CorpoRatApr 24, 2024
    CivitAI

    Your file's name is 4xUltrasharp_4xUltrasharpV10.pt

    I can't use it at hires.fix , only extra's upscale works.

    I downloaded again from Kim's website. It is 4x-UltraSharp.pth Different extension. It's PTH, not PT

    PTH works fine, upscale and hires.fix works fine.

    Btw, I checked sha256s too. Kim's and yours are both A5812231FC936B42AF08A5EDBA784195495D303D5B3248C24489EF0C4021FE01

    Samael1976
    Author
    Apr 24, 2024· 2 reactions

    just read model description:
    HOW TO INSTALL:

    Rename the file from:

    4x-UltraSharp.pt to: 4x-UltraSharp.pth

    Copy the file 4x-UltraSharp.pth inside the folder: "\YOUR~STABLE~DIFFUSION~FOLDER\models\ESRGAN\")

    Restart you Stable Diffusion

    Now in "Extra Tab" you got the new upscale

    CorpoRatApr 24, 2024· 1 reaction

    Oh, right. You clearly mentioned it at "how to install". Totally my bad. Sorry about that.

    Besides "extra tab", It also works in "image generation hires.fix" and does much better work than "latent" upscaler. It's like an alternative of "R-ESRGAN 4X+" upscaler to me. It's a great tool. Only concerning issue is that people don't recommend to use it in image generation due to copyright license issues (even for printing a t-shirt for yourself, you have to give credit)

    Have a nice day.

    Samael1976
    Author
    Apr 24, 2024· 2 reactions

    @jhn4 don't worry, we are humans, and we make mistake ;)

    And thank you for clarifying about the original user license ;)

    razor3208May 6, 2024
    CivitAI

    how to use this upscaler on Foocus Stable diffusion? does it work on focus? please tell how to make it work

    Samael1976
    Author
    May 6, 2024

    I hope that someone can help you, because I never used Foocus

    israelinkvm566Dec 15, 2024

    Dame quesiton here x2, please help to make it work om fooocus

    TortinoFuriosoApr 13, 2025

    same question

    OpenSDJul 12, 2024· 4 reactions
    CivitAI

    What's the difference between the original UltraSharp at https://openmodeldb.info/models/4x-UltraSharp and your UltraSharp.

    OpenSDJul 12, 2024· 2 reactions

    Also, how is this your model if on the version you state its not your model, but on the description you say:

    UPLOADING/SHARING MY MODELS OUTSIDE CIVITAI IS STRICLY PROHIBITED*

    You got this model elsewhere, and people are not allowed to share it?

    Samael1976
    Author
    Jul 12, 2024· 3 reactions

    @AtomicSilo sorry, my mistake in model decription, I will update now. You can share it as you want (or better as Kim the original author wants).

    I'm sorry, my misteka it's because I copied the model description from my other models.

    About the difference, I don't know, I think it's the same, but I'm not sure

    Jbrown777Aug 12, 2024· 2 reactions
    CivitAI

    Hey dumb question but what does this do?

    TianciAug 12, 2024

    It's a upscaler, it increases the resolution of your images.

    Jbrown777Aug 12, 2024

    @Tianci Does it have anything to do with the quality as well?

    SafetyActionOct 12, 2024

    @Jbrown777 Google on youtube upscaling stable diffusion, this is great

    heyoaiAug 13, 2024· 20 reactions
    CivitAI

    Could you update this to safetensor? Idk why all the upscalers seem to still use pickletensor

    cdefjfcdSep 3, 2024· 7 reactions

    Take a look at the original source: https://huggingface.co/Kim2091/UltraSharp/tree/main

    WonderGuard_SpiritombSep 17, 2024

    @cdefjfcd the safetensor file doesnt show up in a1111

    UnKitsuneOct 6, 2024

    @WonderGuard_Spiritomb Did you find how to fix this?

    WonderGuard_SpiritombOct 11, 2024

    @UnKitsune nope i used the pt file

    Samael1976
    Author
    May 29, 2025· 1 reaction
    CivitAI

    Dearest civilians! It's finally coming... if you're curious, in my profile there's "hidden" (but not too much) something new. If you find the PDF, feel free to share! and of course if you don't want to miss the news when it comes out, I suggest you follow my profile on civitai.

    Samael1976
    Author
    Jun 13, 2025· 3 reactions
    CivitAI

    Guys, OmniA is out! The model I've been working on for 6 months!

    Please go download it, it's very important to me

    https://civitai.com/models/1654876

    nitecivitJun 28, 2025· 20 reactions
    CivitAI

    Just a note to myself or whoever else needs it in comfy UI. As per cdefjfcd comment:

    download the safetensors version from here - https://huggingface.co/Kim2091/UltraSharp/tree/main

    into comfy UI folder - models\upscale_models

    navyguy757Feb 6, 2026

    what does that mean exactly? why? is pth not as safe?

    Samael1976
    Author
    Jul 1, 2025· 21 reactions
    CivitAI

    Let's save a great artist!

    I met a super talented person on Instagram who was ready to stop creating due to a lack of support. I talked her into trying for one more month, and this is where you come in!

    Could you please take a moment to follow her? Let's show her that her awesome work is appreciated!

    Instagram: https://www.instagram.com/luna09152004/?g=5

    Patreon: https://www.patreon.com/c/Luna09152004/posts

    A huge thank you to everyone who decides to follow her journey!

    RhixAug 4, 2025· 33 reactions
    CivitAI

    UltraSharpV2 is live! https://huggingface.co/Kim2091/UltraSharpV2/tree/main

    Upscaler
    Upscaler
    by Samael1976
    Download (Beta) View on CivitAI
    tools
    upscaler
    tool

    Details

    Downloads
    235,909
    Platform
    CivitAI
    Platform Status
    Available
    Created
    7/25/2023
    Updated
    5/11/2026
    Deleted
    -

    Files

    4xUltrasharp_4xUltrasharpV10.pt

    Size:
    63.86 MB
    SHA256:
    a5812231fc936b42af08a5edba784195495d303d5b3248c24489ef0c4021fe01

    Mirrors

    HuggingFace (355 mirrors)
    CivitAI (1 mirrors)
    ModelScope (1 mirrors)
    ModelScope CN (2 mirrors)