diff --git a/src/main/index.ts b/src/main/index.ts
index 5519d47ac..5cda4decb 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -93,7 +93,7 @@ if (IS_VESKTOP || !IS_VANILLA) {
             if (header) {
                 const csp = parsePolicy(headers[header][0]);
 
-                for (const directive of ["style-src", "connect-src", "img-src", "font-src", "media-src", "worker-src"]) {
+                for (const directive of ["style-src", "connect-src", "img-src", "font-src", "media-src", "worker-src", "frame-src", "object-src"]) {
                     csp[directive] ??= [];
                     csp[directive].push("*", "blob:", "data:", "vencord:", "'unsafe-inline'");
                 }
diff --git a/src/plugins/pdfViewer.desktop/README.md b/src/plugins/pdfViewer.desktop/README.md
new file mode 100644
index 000000000..70fad73fa
--- /dev/null
+++ b/src/plugins/pdfViewer.desktop/README.md
@@ -0,0 +1,5 @@
+# PdfViewer
+
+Allows you to Preview PDF Files without having to download them
+
+![](https://github.com/user-attachments/assets/f403dff5-5edc-4e57-8503-73f709df4842)
diff --git a/src/plugins/pdfViewer.desktop/cache.ts b/src/plugins/pdfViewer.desktop/cache.ts
new file mode 100644
index 000000000..45f90728d
--- /dev/null
+++ b/src/plugins/pdfViewer.desktop/cache.ts
@@ -0,0 +1,48 @@
+/*
+ * Vencord, a Discord client mod
+ * Copyright (c) 2024 Vendicated and contributors
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+export class LRUCache {
+    private cache: Map<string, string>;
+    private maxSize: number;
+
+    constructor(maxSize: number) {
+        this.cache = new Map();
+        this.maxSize = maxSize;
+    }
+
+    get(key: string): string | undefined {
+        if (!this.cache.has(key)) return undefined;
+
+        const value = this.cache.get(key)!;
+        this.cache.delete(key);
+        this.cache.set(key, value);
+        return value;
+    }
+
+    set(key: string, value: string) {
+        if (this.cache.has(key)) {
+            this.cache.delete(key);
+        } else if (this.cache.size >= this.maxSize) {
+            const oldestKey = this.cache.keys().next().value!;
+            this.cache.delete(oldestKey);
+        }
+
+        this.cache.set(key, value);
+    }
+
+    delete(key: string) {
+        if (!this.cache.has(key)) return;
+        URL.revokeObjectURL(this.cache.get(key)!);
+        this.cache.delete(key);
+    }
+
+    clear() {
+        for (const key of this.cache.keys()) {
+            URL.revokeObjectURL(this.cache.get(key)!);
+        }
+        this.cache.clear();
+    }
+}
diff --git a/src/plugins/pdfViewer.desktop/index.tsx b/src/plugins/pdfViewer.desktop/index.tsx
new file mode 100644
index 000000000..59085a84e
--- /dev/null
+++ b/src/plugins/pdfViewer.desktop/index.tsx
@@ -0,0 +1,176 @@
+/*
+ * Vencord, a Discord client mod
+ * Copyright (c) 2024 Vendicated and contributors
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+import "./pdfViewer.css";
+
+import { get, set } from "@api/DataStore";
+import { addAccessory, removeAccessory } from "@api/MessageAccessories";
+import { updateMessage } from "@api/MessageUpdater";
+import { definePluginSettings } from "@api/Settings";
+import ErrorBoundary from "@components/ErrorBoundary";
+import { Devs } from "@utils/constants";
+import definePlugin, { OptionType, PluginNative } from "@utils/types";
+import { Icons, Spinner, Tooltip, useEffect, useState } from "@webpack/common";
+
+import { LRUCache } from "./cache";
+
+const Native = VencordNative.pluginHelpers.PdfViewer as PluginNative<typeof import("./native")>;
+
+const settings = definePluginSettings({
+    autoEmptyCache: {
+        type: OptionType.BOOLEAN,
+        description: "Automatically remove the cached PDF file when the component is unmounted. Turning this on will increase load times for PDFs that have already been viewed, but may consume less memory.",
+        default: false
+    },
+    persistPreviewState: {
+        type: OptionType.BOOLEAN,
+        description: "Persist the state of opened/closed File Previews across channel switches and reloads.",
+        default: false
+    },
+});
+
+const objectUrlsCache = new LRUCache(20);
+const STORE_KEY = "PdfViewer_PersistVisible";
+
+interface Attachment {
+    id: string;
+    filename: string;
+    size: number;
+    url: string;
+    proxy_url: string;
+    content_type: string;
+    content_scan_version: number;
+    title: string;
+    spoiler: boolean;
+    previewBlobUrl?: string;
+    previewVisible?: boolean;
+}
+
+function FilePreview({ attachment }: { attachment: Attachment; }) {
+    const { previewBlobUrl, previewVisible } = attachment;
+
+    if (!previewVisible) return null;
+
+    return (
+        <div className={"vc-pdf-viewer-container"}>
+            {previewBlobUrl ? <embed src={previewBlobUrl} className="vc-pdf-viewer-preview" title={attachment.filename} /> : <div style={{ display: "flex" }}><Spinner /></div>}
+        </div>
+    );
+}
+
+function PreviewButton({ attachment, channelId, messageId }: { attachment: Attachment; channelId: string; messageId: string; }) {
+    const [visible, setVisible] = useState<boolean | null>(null);
+    const [url, setUrl] = useState<string>();
+
+    const initPdfData = async () => {
+        const cachedUrl = objectUrlsCache.get(attachment.url);
+        if (cachedUrl) {
+            setUrl(cachedUrl);
+            return;
+        }
+        try {
+            const buffer = await Native.getBufferResponse(attachment.url);
+            const file = new File([buffer], attachment.filename, { type: attachment.content_type });
+
+            const blobUrl = URL.createObjectURL(file);
+            objectUrlsCache.set(attachment.url, blobUrl);
+            setUrl(blobUrl);
+        } catch (error) {
+            console.log(error);
+        }
+    };
+
+    const updateVisibility = async () => {
+        const data: Set<string> = await get(STORE_KEY) ?? new Set();
+
+        if (visible === null) {
+            setVisible(settings.store.persistPreviewState ? data.has(attachment.url) : false);
+        } else {
+            if (visible) data.add(attachment.url);
+            else data.delete(attachment.url);
+
+            await set(STORE_KEY, data);
+
+            attachment.previewVisible = visible;
+            updateMessage(channelId, messageId);
+        }
+    };
+
+    useEffect(() => {
+        updateVisibility();
+
+        if (visible && !url) initPdfData();
+    }, [visible]);
+
+    useEffect(() => {
+        attachment.previewBlobUrl = url;
+        updateMessage(channelId, messageId);
+        return () => {
+            if (url && settings.store.autoEmptyCache) {
+                objectUrlsCache.delete(attachment.url);
+            }
+        };
+    }, [url]);
+
+    return <Tooltip text={visible ? "Hide File Preview" : "Preview File"}>
+        {tooltipProps => (
+            <div
+                {...tooltipProps}
+                className="vc-pdf-viewer-toggle"
+                role="button"
+                onClick={() => {
+                    setVisible(v => !v);
+                }}
+            >
+                {visible ? <Icons.EyeSlashIcon /> : <Icons.EyeIcon />}
+            </div>
+        )}
+    </Tooltip>;
+}
+
+export default definePlugin({
+    name: "PdfViewer",
+    description: "Preview PDF Files without having to download them",
+    authors: [Devs.AGreenPig],
+    dependencies: ["MessageAccessoriesAPI", "MessageUpdaterAPI",],
+    settings,
+
+    patches: [
+        {
+            find: "Messages.IMG_ALT_ATTACHMENT_FILE_TYPE.format",
+            replacement: {
+                match: /newMosaicStyle,\i\),children:\[(?<=}=(\i);.+?)/,
+                replace: "$&$self.renderPreviewButton($1),"
+            }
+        }
+    ],
+
+    start() {
+        addAccessory("pdfViewer", props => {
+            const pdfAttachments = props.message.attachments.filter(a => a.content_type === "application/pdf");
+            if (!pdfAttachments.length) return null;
+
+            return (
+                <ErrorBoundary>
+                    {pdfAttachments.map((attachment, index) => (
+                        <FilePreview key={index} attachment={attachment} />
+                    ))}
+                </ErrorBoundary>
+            );
+        }, -1);
+    },
+
+    stop() {
+        objectUrlsCache.clear();
+        removeAccessory("pdfViewer");
+    }
+
+    renderPreviewButton: ErrorBoundary.wrap(e => {
+        if (e.item.originalItem.content_type !== "application/pdf") return null;
+        return <PreviewButton attachment={e.item.originalItem} channelId={e.message.channel_id} messageId={e.message.id} />;
+    }, { noop: true }),
+
+});
diff --git a/src/plugins/pdfViewer.desktop/native.ts b/src/plugins/pdfViewer.desktop/native.ts
new file mode 100644
index 000000000..29850446d
--- /dev/null
+++ b/src/plugins/pdfViewer.desktop/native.ts
@@ -0,0 +1,28 @@
+/*
+ * Vencord, a Discord client mod
+ * Copyright (c) 2024 Vendicated and contributors
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+import { IpcMainInvokeEvent } from "electron";
+
+const urlChecks = [
+    (url: URL) => url.host === "cdn.discordapp.com",
+    (url: URL) => url.pathname.startsWith("/attachments/"),
+    (url: URL) => url.pathname.endsWith(".pdf")
+];
+
+export async function getBufferResponse(_: IpcMainInvokeEvent, url: string): Promise<Buffer> {
+    const urlObj = new URL(url);
+    if (!urlChecks.every(check => check(urlObj))) {
+        throw new Error("Invalid URL");
+    }
+
+    const response = await fetch(url);
+    if (!response.ok) {
+        throw new Error(`Failed to fetch: ${response.statusText}`);
+    }
+
+    const arrayBuffer = await response.arrayBuffer();
+    return Buffer.from(arrayBuffer);
+}
diff --git a/src/plugins/pdfViewer.desktop/pdfViewer.css b/src/plugins/pdfViewer.desktop/pdfViewer.css
new file mode 100644
index 000000000..ff53b9f26
--- /dev/null
+++ b/src/plugins/pdfViewer.desktop/pdfViewer.css
@@ -0,0 +1,30 @@
+.vc-pdf-viewer-container {
+    resize: both;
+    overflow: hidden;
+    max-width: 100%;
+    min-width: 432px;
+    max-height: 80vh;
+    min-height: 500px;
+    box-sizing: border-box;
+    display: flex;
+    justify-content: center;
+}
+
+.vc-pdf-viewer-preview {
+    width: 100%;
+    flex-grow: 1;
+    border: none;
+}
+
+.vc-pdf-viewer-toggle {
+    justify-self: center;
+    display: flex;
+    justify-content: center;
+    margin-right: 8px;
+    color: var(--interactive-normal);
+    cursor: pointer;
+}
+
+.vc-pdf-viewer-toggle:hover {
+    color: var(--interactive-hover);
+}
diff --git a/src/utils/constants.ts b/src/utils/constants.ts
index 6653e6307..e982c95be 100644
--- a/src/utils/constants.ts
+++ b/src/utils/constants.ts
@@ -575,6 +575,10 @@ export const Devs = /* #__PURE__*/ Object.freeze({
         name: "RamziAH",
         id: 1279957227612147747n,
     },
+    AGreenPig: {
+        name: "AGreenPig",
+        id: 427179231164760066n,
+    }
 } satisfies Record<string, Dev>);
 
 // iife so #__PURE__ works correctly
diff --git a/src/webpack/common/components.ts b/src/webpack/common/components.ts
index 0bcb82d1b..fd62533bf 100644
--- a/src/webpack/common/components.ts
+++ b/src/webpack/common/components.ts
@@ -51,6 +51,8 @@ export let ScrollerThin: t.ScrollerThin;
 export let Clickable: t.Clickable;
 export let Avatar: t.Avatar;
 export let FocusLock: t.FocusLock;
+export let Spinner: t.Spinner;
+export let SpinnerType: t.SpinnerType;
 // token lagger real
 /** css colour resolver stuff, no clue what exactly this does, just copied usage from Discord */
 export let useToken: t.useToken;
@@ -84,7 +86,9 @@ waitFor(["FormItem", "Button"], m => {
         Clickable,
         Avatar,
         FocusLock,
-        Heading
+        Heading,
+        Spinner,
+        SpinnerType,
     } = m);
     Forms = m;
     Icons = m;
diff --git a/src/webpack/common/types/components.d.ts b/src/webpack/common/types/components.d.ts
index 260a763a7..068acd3ae 100644
--- a/src/webpack/common/types/components.d.ts
+++ b/src/webpack/common/types/components.d.ts
@@ -505,9 +505,29 @@ type FocusLock = ComponentType<PropsWithChildren<{
     containerRef: RefObject<HTMLElement>;
 }>>;
 
+export declare enum SpinnerType {
+    WANDERING_CUBES = "wanderingCubes",
+    CHASING_DOTS = "chasingDots",
+    PULSING_ELLIPSIS = "pulsingEllipsis",
+    SPINNING_CIRCLE = "spinningCircle",
+    SPINNING_CIRCLE_SIMPLE = "spinningCircleSimple",
+    LOW_MOTION = "lowMotion",
+}
+
+export type Spinner = ComponentType<{
+    type?: SpinnerType;
+    animated?: boolean;
+    className?: string;
+    itemClassName?: string;
+    "aria-label"?: string;
+}> & {
+    Type: typeof SpinnerType;
+};
+
 export type Icon = ComponentType<JSX.IntrinsicElements["svg"] & {
     size?: string;
     colorClass?: string;
 } & Record<string, any>>;
 
 export type Icons = Record<IconNames, Icon>;
+