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diff --git a/FrontEnd/src/views/settings/ChangeAvatarDialog.tsx b/FrontEnd/src/views/settings/ChangeAvatarDialog.tsx
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index 00000000..338d2112
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+++ b/FrontEnd/src/views/settings/ChangeAvatarDialog.tsx
@@ -0,0 +1,305 @@
+import React, { useState, useEffect } from "react";
+import { useTranslation } from "react-i18next";
+import { AxiosError } from "axios";
+import { Modal, Row, Button } from "react-bootstrap";
+
+import { UiLogicError } from "@/common";
+
+import { useUserLoggedIn } from "@/services/user";
+
+import { getHttpUserClient } from "http/user";
+
+import ImageCropper, { Clip, applyClipToImage } from "../common/ImageCropper";
+
+export interface ChangeAvatarDialogProps {
+  open: boolean;
+  close: () => void;
+}
+
+const ChangeAvatarDialog: React.FC<ChangeAvatarDialogProps> = (props) => {
+  const { t } = useTranslation();
+
+  const user = useUserLoggedIn();
+
+  const [file, setFile] = React.useState<File | null>(null);
+  const [fileUrl, setFileUrl] = React.useState<string | null>(null);
+  const [clip, setClip] = React.useState<Clip | null>(null);
+  const [cropImgElement, setCropImgElement] =
+    React.useState<HTMLImageElement | null>(null);
+  const [resultBlob, setResultBlob] = React.useState<Blob | null>(null);
+  const [resultUrl, setResultUrl] = React.useState<string | null>(null);
+
+  const [state, setState] = React.useState<
+    | "select"
+    | "crop"
+    | "processcrop"
+    | "preview"
+    | "uploading"
+    | "success"
+    | "error"
+  >("select");
+
+  const [message, setMessage] = useState<
+    string | { type: "custom"; text: string } | null
+  >("settings.dialogChangeAvatar.prompt.select");
+
+  const trueMessage =
+    message == null
+      ? null
+      : typeof message === "string"
+      ? t(message)
+      : message.text;
+
+  const closeDialog = props.close;
+
+  const close = React.useCallback((): void => {
+    if (!(state === "uploading")) {
+      closeDialog();
+    }
+  }, [state, closeDialog]);
+
+  useEffect(() => {
+    if (file != null) {
+      const url = URL.createObjectURL(file);
+      setClip(null);
+      setFileUrl(url);
+      setState("crop");
+      return () => {
+        URL.revokeObjectURL(url);
+      };
+    } else {
+      setFileUrl(null);
+      setState("select");
+    }
+  }, [file]);
+
+  React.useEffect(() => {
+    if (resultBlob != null) {
+      const url = URL.createObjectURL(resultBlob);
+      setResultUrl(url);
+      setState("preview");
+      return () => {
+        URL.revokeObjectURL(url);
+      };
+    } else {
+      setResultUrl(null);
+    }
+  }, [resultBlob]);
+
+  const onSelectFile = React.useCallback(
+    (e: React.ChangeEvent<HTMLInputElement>): void => {
+      const files = e.target.files;
+      if (files == null || files.length === 0) {
+        setFile(null);
+      } else {
+        setFile(files[0]);
+      }
+    },
+    []
+  );
+
+  const onCropNext = React.useCallback(() => {
+    if (
+      cropImgElement == null ||
+      clip == null ||
+      clip.width === 0 ||
+      file == null
+    ) {
+      throw new UiLogicError();
+    }
+
+    setState("processcrop");
+    void applyClipToImage(cropImgElement, clip, file.type).then((b) => {
+      setResultBlob(b);
+    });
+  }, [cropImgElement, clip, file]);
+
+  const onCropPrevious = React.useCallback(() => {
+    setFile(null);
+    setState("select");
+  }, []);
+
+  const onPreviewPrevious = React.useCallback(() => {
+    setResultBlob(null);
+    setState("crop");
+  }, []);
+
+  const upload = React.useCallback(() => {
+    if (resultBlob == null) {
+      throw new UiLogicError();
+    }
+
+    setState("uploading");
+    getHttpUserClient()
+      .putAvatar(user.username, resultBlob)
+      .then(
+        () => {
+          setState("success");
+        },
+        (e: unknown) => {
+          setState("error");
+          setMessage({ type: "custom", text: (e as AxiosError).message });
+        }
+      );
+  }, [user.username, resultBlob]);
+
+  const createPreviewRow = (): React.ReactElement => {
+    if (resultUrl == null) {
+      throw new UiLogicError();
+    }
+    return (
+      <Row className="justify-content-center">
+        <img
+          className="change-avatar-img"
+          src={resultUrl}
+          alt={t("settings.dialogChangeAvatar.previewImgAlt")}
+        />
+      </Row>
+    );
+  };
+
+  return (
+    <Modal show={props.open} onHide={close}>
+      <Modal.Header>
+        <Modal.Title> {t("settings.dialogChangeAvatar.title")}</Modal.Title>
+      </Modal.Header>
+      {(() => {
+        if (state === "select") {
+          return (
+            <>
+              <Modal.Body className="container">
+                <Row>{t("settings.dialogChangeAvatar.prompt.select")}</Row>
+                <Row>
+                  <input type="file" accept="image/*" onChange={onSelectFile} />
+                </Row>
+              </Modal.Body>
+              <Modal.Footer>
+                <Button variant="secondary" onClick={close}>
+                  {t("operationDialog.cancel")}
+                </Button>
+              </Modal.Footer>
+            </>
+          );
+        } else if (state === "crop") {
+          if (fileUrl == null) {
+            throw new UiLogicError();
+          }
+          return (
+            <>
+              <Modal.Body className="container">
+                <Row className="justify-content-center">
+                  <ImageCropper
+                    clip={clip}
+                    onChange={setClip}
+                    imageUrl={fileUrl}
+                    imageElementCallback={setCropImgElement}
+                  />
+                </Row>
+                <Row>{t("settings.dialogChangeAvatar.prompt.crop")}</Row>
+              </Modal.Body>
+              <Modal.Footer>
+                <Button variant="secondary" onClick={close}>
+                  {t("operationDialog.cancel")}
+                </Button>
+                <Button variant="secondary" onClick={onCropPrevious}>
+                  {t("operationDialog.previousStep")}
+                </Button>
+                <Button
+                  color="primary"
+                  onClick={onCropNext}
+                  disabled={
+                    cropImgElement == null || clip == null || clip.width === 0
+                  }
+                >
+                  {t("operationDialog.nextStep")}
+                </Button>
+              </Modal.Footer>
+            </>
+          );
+        } else if (state === "processcrop") {
+          return (
+            <>
+              <Modal.Body className="container">
+                <Row>
+                  {t("settings.dialogChangeAvatar.prompt.processingCrop")}
+                </Row>
+              </Modal.Body>
+              <Modal.Footer>
+                <Button variant="secondary" onClick={close}>
+                  {t("operationDialog.cancel")}
+                </Button>
+                <Button variant="secondary" onClick={onPreviewPrevious}>
+                  {t("operationDialog.previousStep")}
+                </Button>
+              </Modal.Footer>
+            </>
+          );
+        } else if (state === "preview") {
+          return (
+            <>
+              <Modal.Body className="container">
+                {createPreviewRow()}
+                <Row>{t("settings.dialogChangeAvatar.prompt.preview")}</Row>
+              </Modal.Body>
+              <Modal.Footer>
+                <Button variant="secondary" onClick={close}>
+                  {t("operationDialog.cancel")}
+                </Button>
+                <Button variant="secondary" onClick={onPreviewPrevious}>
+                  {t("operationDialog.previousStep")}
+                </Button>
+                <Button variant="primary" onClick={upload}>
+                  {t("settings.dialogChangeAvatar.upload")}
+                </Button>
+              </Modal.Footer>
+            </>
+          );
+        } else if (state === "uploading") {
+          return (
+            <>
+              <Modal.Body className="container">
+                {createPreviewRow()}
+                <Row>{t("settings.dialogChangeAvatar.prompt.uploading")}</Row>
+              </Modal.Body>
+              <Modal.Footer></Modal.Footer>
+            </>
+          );
+        } else if (state === "success") {
+          return (
+            <>
+              <Modal.Body className="container">
+                <Row className="p-4 text-success">
+                  {t("operationDialog.success")}
+                </Row>
+              </Modal.Body>
+              <Modal.Footer>
+                <Button variant="success" onClick={close}>
+                  {t("operationDialog.ok")}
+                </Button>
+              </Modal.Footer>
+            </>
+          );
+        } else {
+          return (
+            <>
+              <Modal.Body className="container">
+                {createPreviewRow()}
+                <Row className="text-danger">{trueMessage}</Row>
+              </Modal.Body>
+              <Modal.Footer>
+                <Button variant="secondary" onClick={close}>
+                  {t("operationDialog.cancel")}
+                </Button>
+                <Button variant="primary" onClick={upload}>
+                  {t("operationDialog.retry")}
+                </Button>
+              </Modal.Footer>
+            </>
+          );
+        }
+      })()}
+    </Modal>
+  );
+};
+
+export default ChangeAvatarDialog;