diff --git a/Core/API/Parameter/FloatType.class.php b/Core/API/Parameter/FloatType.class.php
new file mode 100644
index 0000000..d3f8c41
--- /dev/null
+++ b/Core/API/Parameter/FloatType.class.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Core\API\Parameter;
+
+class FloatType extends Parameter {
+
+  public float $minValue;
+  public float $maxValue;
+  public function __construct(string $name, float $minValue = PHP_FLOAT_MIN, float $maxValue = PHP_FLOAT_MAX,
+                              bool $optional = FALSE, ?float $defaultValue = NULL, ?array $choices = NULL) {
+    $this->minValue = $minValue;
+    $this->maxValue = $maxValue;
+    parent::__construct($name, Parameter::TYPE_FLOAT, $optional, $defaultValue, $choices);
+  }
+
+  public function parseParam($value): bool {
+    if (!parent::parseParam($value)) {
+      return false;
+    }
+
+    $this->value = $value;
+    if ($this->value < $this->minValue || $this->value > $this->maxValue) {
+      return false;
+    }
+
+    return true;
+  }
+
+  public function getTypeName(): string {
+    $typeName = parent::getTypeName();
+    $hasMin = $this->minValue > PHP_FLOAT_MIN;
+    $hasMax = $this->maxValue < PHP_FLOAT_MAX;
+
+    if ($hasMin || $hasMax) {
+      if ($hasMin && $hasMax) {
+        $typeName .= " ($this->minValue - $this->maxValue)";
+      } else if ($hasMin) {
+        $typeName .= " (> $this->minValue)";
+      } else if ($hasMax) {
+        $typeName .= " (< $this->maxValue)";
+      }
+    }
+
+    return $typeName;
+  }
+
+  public function toString(): string {
+    $typeName = $this->getTypeName();
+    $str = "$typeName $this->name";
+    $defaultValue = (is_null($this->value) ? 'NULL' : $this->value);
+    if ($this->optional) {
+      $str = "[$str = $defaultValue]";
+    }
+
+    return $str;
+  }
+}
\ No newline at end of file
diff --git a/Core/API/UserAPI.class.php b/Core/API/UserAPI.class.php
index c0b3d11..5a26c4f 100644
--- a/Core/API/UserAPI.class.php
+++ b/Core/API/UserAPI.class.php
@@ -121,6 +121,8 @@ namespace Core\API {
 namespace Core\API\User {
 
   use Core\API\Parameter\ArrayType;
+  use Core\API\Parameter\FloatType;
+  use Core\API\Parameter\IntegerType;
   use Core\API\Parameter\Parameter;
   use Core\API\Parameter\StringType;
   use Core\API\Template\Render;
@@ -1311,10 +1313,15 @@ namespace Core\API\User {
   }
 
   class UploadPicture extends UserAPI {
+
+    const MIN_SIZE = 150;
+    const MAX_SIZE = 800;
+
     public function __construct(Context $context, bool $externalCall = false) {
-      // TODO: we should optimize the process here, we need an offset and size parameter to get a quadratic crop of the uploaded image
       parent::__construct($context, $externalCall, [
-        "scale" => new Parameter("scale", Parameter::TYPE_FLOAT, true, NULL),
+        "x" => new FloatType("x", 0, PHP_FLOAT_MAX, true, NULL),
+        "y" => new FloatType("y", 0, PHP_FLOAT_MAX, true, NULL),
+        "size" => new FloatType("size", self::MIN_SIZE, self::MAX_SIZE, true, NULL),
       ]);
       $this->loginRequired = true;
       $this->forbidMethod("GET");
@@ -1325,64 +1332,31 @@ namespace Core\API\User {
      */
     protected function onTransform(\Imagick $im, $uploadDir): bool|string {
 
-      $minSize = 75;
-      $maxSize = 500;
-
       $width = $im->getImageWidth();
       $height = $im->getImageHeight();
-      $doResize = false;
+      $maxPossibleSize = min($width, $height);
 
-      if ($width < $minSize || $height < $minSize) {
-        if ($width < $height) {
-          $newWidth = $minSize;
-          $newHeight = intval(($minSize / $width) * $height);
-        } else {
-          $newHeight = $minSize;
-          $newWidth = intval(($minSize / $height) * $width);
-        }
+      $cropX = $this->getParam("x");
+      $cropY = $this->getParam("y");
+      $cropSize = $this->getParam("size") ?? $maxPossibleSize;
 
-        $doResize = true;
-      } else if ($width > $maxSize || $height > $maxSize) {
-        if ($width > $height) {
-          $newWidth = $maxSize;
-          $newHeight = intval($height * ($maxSize / $width));
-        } else {
-          $newHeight = $maxSize;
-          $newWidth = intval($width * ($maxSize / $height));
-        }
-
-        $doResize = true;
-      } else {
-        $newWidth = $width;
-        $newHeight = $height;
+      if ($maxPossibleSize < self::MIN_SIZE) {
+        return $this->createError("Image must be at least " . self::MIN_SIZE . "x" . self::MIN_SIZE);
+      } else if ($cropSize > self::MAX_SIZE) {
+        return $this->createError("Crop must be at most " . self::MAX_SIZE . "x" . self::MAX_SIZE);
+      } else if ($cropSize > $maxPossibleSize) {
+        return $this->createError("Invalid crop size");
       }
 
-      if ($width < $minSize || $height < $minSize) {
-        return $this->createError("Error processing image. Bad dimensions.");
+      if ($cropX === null) {
+        $cropX = ($width > $height) ? ($width - $height) / 2 : 0;
       }
 
-      if ($doResize) {
-        $width = $newWidth;
-        $height = $newHeight;
-        $im->resizeImage($width, $height, \Imagick::FILTER_SINC, 1);
-      }
-
-      $size = $this->getParam("size");
-      if (is_null($size)) {
-        $size = min($width, $height);
-      }
-
-      $offset = [$this->getParam("offsetX"), $this->getParam("offsetY")];
-      if ($size < $minSize or $size > $maxSize) {
-        return $this->createError("Invalid size. Must be in range of $minSize-$maxSize.");
-      }/* else if ($offset[0] < 0 || $offset[1] < 0 || $offset[0]+$size > $width ||  $offset[1]+$size > $height) {
-        return $this->createError("Offsets out of bounds.");
-      }*/
-
-      if ($offset[0] !== 0 || $offset[1] !== 0 || $size !== $width || $size !== $height) {
-        $im->cropImage($size, $size, $offset[0], $offset[1]);
+      if ($cropY === null) {
+        $cropY = ($height > $width) ? ($height - $width) / 2 : 0;
       }
 
+      $im->cropImage($cropSize, $cropSize, $cropX, $cropY);
       $fileName = uuidv4() . ".jpg";
       $im->writeImage("$uploadDir/$fileName");
       $im->destroy();
diff --git a/Core/Localization/de_DE/account.php b/Core/Localization/de_DE/account.php
index 603b938..7e6cb5d 100644
--- a/Core/Localization/de_DE/account.php
+++ b/Core/Localization/de_DE/account.php
@@ -58,8 +58,13 @@ return [
   "user_list_placeholder" => "Keine Benutzer zum Anzeigen",
 
   # profile picture
+  "remove_picture" => "Profilbild entfernen",
+  "remove_picture_text" => "Möchten Sie wirklich Ihr aktuelles Profilbild entfernen?",
   "change_picture" => "Profilbild ändern",
   "profile_picture_of" => "Profilbild von",
+  "change_picture_title" => "Profilbild ändern",
+  "change_picture_text" => "Wähle ein Profilbild aus und passe die sichtbare Fläche an.",
+  "profile_picture_invalid_dimensions" => "Das Profilbild muss mindestens 150x150px groß sein.",
 
   # dialogs
   "fetch_group_members_error" => "Fehler beim Holen der Gruppenmitglieder",
diff --git a/Core/Localization/en_US/account.php b/Core/Localization/en_US/account.php
index 4454a39..31a8b8b 100644
--- a/Core/Localization/en_US/account.php
+++ b/Core/Localization/en_US/account.php
@@ -60,8 +60,13 @@ return [
   "user_list_placeholder" => "No users to display",
 
   # profile picture
+  "remove_picture" => "Remove profile picture",
+  "remove_picture_text" => "Do you really want to remove your current profile picture?",
   "change_picture" => "Change profile picture",
   "profile_picture_of" => "Profile Picture of",
+  "change_picture_title" => "Change Profile picture",
+  "change_picture_text" => "Choose a profile picture and adjust the visible area.",
+  "profile_picture_invalid_dimensions" => "The profile picture must have at least a size of 150x150.",
 
   # dialogs
   "fetch_group_members_error" => "Error fetching group members",
diff --git a/react/admin-panel/package.json b/react/admin-panel/package.json
index 782a195..b323fb9 100644
--- a/react/admin-panel/package.json
+++ b/react/admin-panel/package.json
@@ -2,8 +2,9 @@
   "name": "admin-panel",
   "version": "1.0.0",
   "dependencies": {
-    "shared": "link:../shared",
-    "react": "^18.2.0"
+    "react": "^18.2.0",
+    "react-image-crop": "^11.0.5",
+    "shared": "link:../shared"
   },
   "scripts": {
     "dev": "HTTPS=true react-app-rewired start"
diff --git a/react/admin-panel/src/views/profile/edit-picture.js b/react/admin-panel/src/views/profile/edit-picture.js
index add3b3c..b15e28c 100644
--- a/react/admin-panel/src/views/profile/edit-picture.js
+++ b/react/admin-panel/src/views/profile/edit-picture.js
@@ -1,16 +1,32 @@
-import {Box, Button, CircularProgress, Slider, styled} from "@mui/material";
-import {useCallback, useContext, useRef, useState} from "react";
+import {
+    Box,
+    Button,
+    CircularProgress,
+    Dialog, DialogActions,
+    DialogContent,
+    DialogContentText,
+    DialogTitle,
+    styled, TextField
+} from "@mui/material";
+import {useCallback, useContext, useState} from "react";
 import {LocaleContext} from "shared/locale";
-import PreviewProfilePicture from "./preview-picture";
-import {Delete, Edit} from "@mui/icons-material";
+import {Delete, Edit, Upload} from "@mui/icons-material";
 import ProfilePicture from "shared/elements/profile-picture";
+import ReactCrop from 'react-image-crop'
+
+import 'react-image-crop/dist/ReactCrop.css';
 
 const ProfilePictureBox = styled(Box)((props) => ({
-    padding: props.theme.spacing(2),
+    padding: props.theme.spacing(1),
     display: "grid",
-    gridTemplateRows: "auto 60px",
-    gridGap: props.theme.spacing(2),
+    gridTemplateRows: "auto calc(110px - " + props.theme.spacing(1) + ")",
     textAlign: "center",
+    alignItems: "center",
+    justifyItems: "center",
+    "& img": {
+        maxHeight: 150,
+        width: "auto",
+    }
 }));
 
 const VerticalButtonBar = styled(Box)((props) => ({
@@ -24,67 +40,46 @@ export default function EditProfilePicture(props) {
 
     // meta
     const {translate: L} = useContext(LocaleContext);
-    // const [scale, setScale] = useState(100);
-    const scale = useRef(100);
     const {api, showDialog, setProfile, profile, setDialogData, ...other} = props
 
-    const onUploadPicture = useCallback((data) => {
-        api.uploadPicture(data, scale.current / 100.0).then((res) => {
-            if (!res.success) {
-                showDialog(res.msg, L("Error uploading profile picture"));
-            } else {
-                setProfile({...profile, profilePicture: res.profilePicture});
-            }
-        })
-    }, [api, scale.current, showDialog, profile]);
+    // data
+    const [crop, setCrop] = useState({ unit: 'px' });
+    const [image, setImage] = useState({ loading: false, data: null, file: null });
+
+    // ui
+    const [isUploading, setUploading] = useState(false);
+
+    const onCloseDialog = useCallback((event = null, reason = null) => {
+        if (!reason || !["backdropClick", "escapeKeyDown"].includes(reason)) {
+            setImage({loading: false, data: null, file: null});
+        }
+    }, []);
+
+    const onUploadPicture = useCallback(() => {
+        if (!isUploading) {
+            setUploading(true);
+            api.uploadPicture(image.file, crop.width, crop.x, crop.y).then(res => {
+                setUploading(false);
+                if (res.success) {
+                    onCloseDialog();
+                    setProfile({...profile, profilePicture: res.profilePicture});
+                } else {
+                    showDialog(res.msg, L("account.upload_profile_picture_error"));
+                }
+            })
+        }
+    }, [api, image, crop, isUploading, showDialog, profile, onCloseDialog]);
 
     const onRemoveImage = useCallback(() => {
         api.removePicture().then((res) => {
             if (!res.success) {
-                showDialog(res.msg, L("Error removing profile picture"));
+                showDialog(res.msg, L("account.remove_profile_picture_error"));
             } else {
                 setProfile({...profile, profilePicture: null});
             }
         });
     }, [api, showDialog, profile]);
 
-    const onOpenDialog = useCallback((file = null, data = null) => {
-
-        let img = null;
-        if (data !== null) {
-            img = new Image();
-            img.src = data;
-        }
-
-        setDialogData({
-            show: true,
-            title: L("account.change_picture_title"),
-            text: L("account.change_picture_text"),
-            options: data === null ? [L("general.cancel")] : [L("general.apply"), L("general.cancel")],
-            inputs: data === null ? [{
-                key: "pfp-loading",
-                type: "custom",
-                element: CircularProgress,
-            }] : [
-                {
-                    key: "pfp-preview",
-                    type: "custom",
-                    element: PreviewProfilePicture,
-                    img: img,
-                    scale: scale.current,
-                    setScale: (v) => scale.current = v,
-                },
-            ],
-            onOption: (option) => {
-                if (option === 1 && file) {
-                    onUploadPicture(file)
-                }
-
-                // scale.current = 100;
-            }
-        })
-    }, [setDialogData, onUploadPicture]);
-
     const onSelectImage = useCallback(() => {
         let fileInput = document.createElement("input");
         fileInput.type = "file";
@@ -94,38 +89,91 @@ export default function EditProfilePicture(props) {
             if (file) {
                 let reader = new FileReader();
                 reader.onload = function (e) {
-                    onOpenDialog(file, e.target.result);
+                    const imageData = e.target.result;
+                    const img = new Image();
+                    img.src = imageData;
+                    img.onload = () => {
+                        let croppedSize;
+                        if (img.width > img.height) {
+                            croppedSize = Math.min(800, img.height);
+                            setCrop({ x: (img.width - img.height) / 2, y: 0, unit: "px", width: croppedSize, height: croppedSize });
+                        } else if (img.width < img.height) {
+                            croppedSize = Math.min(800, img.width);
+                            setCrop({ x: 0, y: (img.height - img.width) / 2, unit: "px", width: croppedSize, height: croppedSize });
+                        } else {
+                            croppedSize = Math.min(800, img.width);
+                            setCrop({ x: 0, y: 0, unit: "px", width: croppedSize, height: croppedSize });
+                        }
+
+                        if (croppedSize < 150) {
+                            setImage({ loading: false, file: null, data: null });
+                            showDialog(L("account.profile_picture_invalid_dimensions"), L("general.error"));
+                        } else {
+                            setImage({ loading: false, file: file, data: imageData });
+                        }
+                    }
                 }
 
-                onOpenDialog();
+                setImage({ file: null, data: null, loading: true });
                 reader.readAsDataURL(file);
             }
         };
         fileInput.click();
-    }, [onOpenDialog]);
+    }, [showDialog]);
 
-
-    return <ProfilePictureBox {...other}>
-        <ProfilePicture user={profile} onClick={onSelectImage} />
-        <VerticalButtonBar>
-            <Button variant="outlined" size="small"
-                    startIcon={<Edit />}
-                    onClick={onSelectImage}>
-                {L("account.change_picture")}
-            </Button>
-            {profile.profilePicture &&
+    return <>
+        <ProfilePictureBox {...other}>
+            <ProfilePicture user={profile} onClick={onSelectImage} />
+            <VerticalButtonBar>
                 <Button variant="outlined" size="small"
-                    startIcon={<Delete />} color={"error"}
-                    onClick={() => setDialogData({
-                        show: true,
-                        title: L("account.picture_remove_title"),
-                        message: L("account.picture_remove_text"),
-                        options: [L("general.confirm"), L("general.cancel")],
-                        onOption: (option) => option === 1 ? onRemoveImage() : true
-                    })}>
-                    {L("account.remove_picture")}
+                        startIcon={<Edit />}
+                        onClick={onSelectImage}>
+                    {L("account.change_picture")}
                 </Button>
-            }
-        </VerticalButtonBar>
-    </ProfilePictureBox>
+                {profile.profilePicture &&
+                    <Button variant="outlined" size="small"
+                        startIcon={<Delete />} color={"error"}
+                        onClick={() => setDialogData({
+                            show: true,
+                            title: L("account.remove_picture"),
+                            message: L("account.remove_picture_text"),
+                            options: [L("general.cancel"), L("general.confirm")],
+                            onOption: (option) => option === 1 ? onRemoveImage() : true
+                        })}>
+                        {L("account.remove_picture")}
+                    </Button>
+                }
+            </VerticalButtonBar>
+        </ProfilePictureBox>
+        <Dialog open={image.loading || image.data !== null} maxWidth={"lg"}
+            onClose={onCloseDialog}>
+            <DialogTitle>
+                {L("account.change_picture_title")}
+            </DialogTitle>
+            <DialogContent>
+                <DialogContentText>
+                    {L("account.change_picture_text")}
+                </DialogContentText>
+                {image.data ?
+                    <ReactCrop onChange={c => setCrop(c)} crop={crop} keepSelection={true}
+                               aspect={1} circularCrop={true} disabled={isUploading}
+                               maxWidth={800} maxHeight={800} minWidth={150} minHeight={150}>
+                        <img src={image?.data} alt={"preview"} />
+                    </ReactCrop> :
+                    <CircularProgress />
+                }
+            </DialogContent>
+            <DialogActions>
+                <Button variant={"outlined"} color={"error"} onClick={onCloseDialog}
+                        disabled={isUploading}>
+                    {L("general.cancel")}
+                </Button>
+                <Button variant={"outlined"} type={"submit"} onClick={onUploadPicture}
+                        disabled={isUploading}
+                        startIcon={isUploading ? <CircularProgress size={12} /> : <Upload />}>
+                    {L(isUploading ? "general.uploading" : "general.submit")}
+                </Button>
+            </DialogActions>
+        </Dialog>
+    </>
 }
\ No newline at end of file
diff --git a/react/shared/api.js b/react/shared/api.js
index 4955bef..7a5d21b 100644
--- a/react/shared/api.js
+++ b/react/shared/api.js
@@ -187,9 +187,11 @@ export default class API {
         return res;
     }
 
-    async uploadPicture(file, scale=1.0) {
+    async uploadPicture(file, size, x = 0, y = 0) {
         const formData = new FormData();
-        formData.append("scale", scale);
+        formData.append("size", size);
+        formData.append("x", x);
+        formData.append("y", y);
         formData.append("picture", file, file.name);
         let res = await this.apiCall("user/uploadPicture", formData);
         if (res.success) {
diff --git a/react/shared/elements/profile-picture.js b/react/shared/elements/profile-picture.js
index 0d99327..b96a74f 100644
--- a/react/shared/elements/profile-picture.js
+++ b/react/shared/elements/profile-picture.js
@@ -13,6 +13,8 @@ const PicturePlaceholderBox = styled(Box)((props) => ({
     alignItems: "center",
     background: "radial-gradient(circle closest-side, gray 98%, transparent 100%);",
     containerType: "inline-size",
+    width: "100%",
+    height: "100%",
     "& > span": {
         textAlign: "center",
         fontSize: "30cqw",
diff --git a/react/yarn.lock b/react/yarn.lock
index 5bcf891..db9dc75 100644
--- a/react/yarn.lock
+++ b/react/yarn.lock
@@ -9112,6 +9112,11 @@ react-error-overlay@^6.0.11:
   resolved "https://registry.yarnpkg.com/react-error-overlay/-/react-error-overlay-6.0.11.tgz#92835de5841c5cf08ba00ddd2d677b6d17ff9adb"
   integrity sha512-/6UZ2qgEyH2aqzYZgQPxEnz33NJ2gNsnHA2o5+o4wW9bLM/JYQitNP9xPhsXwC08hMMovfGe/8retsdDsczPRg==
 
+react-image-crop@^11.0.5:
+  version "11.0.5"
+  resolved "https://registry.yarnpkg.com/react-image-crop/-/react-image-crop-11.0.5.tgz#c7abcf9cae28305d253d55d481158a594a937867"
+  integrity sha512-A/Y/kspOzki1zDL/bSgwWIY1X3CQ9F1QwpdnncWLBVAktnKfAZDIQnWmjXzuzEjZHDMsBlArytIcPBVi6DNklg==
+
 react-is@^16.13.1, react-is@^16.7.0:
   version "16.13.1"
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.13.1.tgz#789729a4dc36de2999dc156dd6c1d9c18cea56a4"