diff --git a/package.json b/package.json
index 7aa795f7..75d5a021 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,6 @@
     "json5": "^2.2.0",
     "lodash.throttle": "^4.1.1",
     "nanoid": "^4.0.0",
-    "node-webvtt": "^1.9.4",
     "ofetch": "^1.0.0",
     "pako": "^2.1.0",
     "react": "^17.0.2",
@@ -31,7 +30,7 @@
     "react-stickynode": "^4.1.0",
     "react-transition-group": "^4.4.5",
     "react-use": "^17.4.0",
-    "srt-webvtt": "^2.0.0",
+    "subsrt-ts": "^2.1.0",
     "unpacker": "^1.0.1"
   },
   "scripts": {
diff --git a/src/@types/node_webtt.d.ts b/src/@types/node_webtt.d.ts
deleted file mode 100644
index 5662d89f..00000000
--- a/src/@types/node_webtt.d.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-declare module "node-webvtt" {
-  interface Cue {
-    identifier: string;
-    start: number;
-    end: number;
-    text: string;
-    styles: string;
-  }
-  interface Options {
-    meta?: boolean;
-    strict?: boolean;
-  }
-  type ParserError = Error;
-  interface ParseResult {
-    valid: boolean;
-    strict: boolean;
-    cues: Cue[];
-    errors: ParserError[];
-    meta?: Map<string, string>;
-  }
-  interface Segment {
-    duration: number;
-    cues: Cue[];
-  }
-  function parse(text: string, options: Options): ParseResult;
-  function segment(input: string, segmentLength?: number): Segment[];
-}
diff --git a/src/backend/helpers/captions.ts b/src/backend/helpers/captions.ts
index 4bd11052..83edaa84 100644
--- a/src/backend/helpers/captions.ts
+++ b/src/backend/helpers/captions.ts
@@ -1,48 +1,24 @@
 import { mwFetch, proxiedFetch } from "@/backend/helpers/fetch";
-import { MWCaption, MWCaptionType } from "@/backend/helpers/streams";
-import toWebVTT from "srt-webvtt";
+import { MWCaption } from "@/backend/helpers/streams";
 import DOMPurify from "dompurify";
+import { parse, detect, list } from "subsrt-ts";
+import { ContentCaption } from "subsrt-ts/dist/types/handler";
 
+export const subtitleTypeList = list().map((type) => `.${type}`);
 export const sanitize = DOMPurify.sanitize;
-export const CUSTOM_CAPTION_ID = "customCaption";
 export async function getCaptionUrl(caption: MWCaption): Promise<string> {
-  if (caption.type === MWCaptionType.SRT) {
-    let captionBlob: Blob;
-
-    if (caption.needsProxy) {
-      captionBlob = await proxiedFetch<Blob>(caption.url, {
-        responseType: "blob" as any,
-      });
-    } else {
-      captionBlob = await mwFetch<Blob>(caption.url, {
-        responseType: "blob" as any,
-      });
-    }
-
-    return toWebVTT(captionBlob);
+  if (caption.url.startsWith("blob:")) return caption.url;
+  let captionBlob: Blob;
+  if (caption.needsProxy) {
+    captionBlob = await proxiedFetch<Blob>(caption.url, {
+      responseType: "blob" as any,
+    });
+  } else {
+    captionBlob = await mwFetch<Blob>(caption.url, {
+      responseType: "blob" as any,
+    });
   }
-
-  if (caption.type === MWCaptionType.VTT) {
-    if (caption.needsProxy) {
-      const blob = await proxiedFetch<Blob>(caption.url, {
-        responseType: "blob" as any,
-      });
-      return URL.createObjectURL(blob);
-    }
-
-    return caption.url;
-  }
-
-  throw new Error("invalid type");
-}
-
-export async function convertCustomCaptionFileToWebVTT(file: File) {
-  const header = await file.slice(0, 6).text();
-  const isWebVTT = header === "WEBVTT";
-  if (!isWebVTT) {
-    return toWebVTT(file);
-  }
-  return URL.createObjectURL(file);
+  return URL.createObjectURL(captionBlob);
 }
 
 export function revokeCaptionBlob(url: string | undefined) {
@@ -50,3 +26,12 @@ export function revokeCaptionBlob(url: string | undefined) {
     URL.revokeObjectURL(url);
   }
 }
+
+export function parseSubtitles(text: string): ContentCaption[] {
+  if (detect(text) === "") {
+    throw new Error("Invalid subtitle format");
+  }
+  return parse(text).filter(
+    (cue) => cue.type === "caption"
+  ) as ContentCaption[];
+}
diff --git a/src/backend/helpers/streams.ts b/src/backend/helpers/streams.ts
index 27e9fddb..12cbc551 100644
--- a/src/backend/helpers/streams.ts
+++ b/src/backend/helpers/streams.ts
@@ -6,6 +6,7 @@ export enum MWStreamType {
 export enum MWCaptionType {
   VTT = "vtt",
   SRT = "srt",
+  UNKNOWN = "unknown",
 }
 
 export enum MWStreamQuality {
diff --git a/src/backend/providers/superstream/index.ts b/src/backend/providers/superstream/index.ts
index 8abed467..9ebe6262 100644
--- a/src/backend/providers/superstream/index.ts
+++ b/src/backend/providers/superstream/index.ts
@@ -225,15 +225,23 @@ registerProvider({
 
     const subtitleRes = (await get(subtitleApiQuery)).data;
 
-    const mappedCaptions = subtitleRes.list.map((subtitle: any): MWCaption => {
-      return {
-        needsProxy: true,
-        langIso: subtitle.language,
-        url: subtitle.subtitles[0].file_path,
-        type: MWCaptionType.SRT,
-      };
-    });
-
+    const mappedCaptions = subtitleRes.list.map(
+      (subtitle: any): MWCaption | null => {
+        const sub = subtitle;
+        sub.subtitles = subtitle.subtitles.filter((subFile: any) => {
+          const extension = subFile.file_path.substring(
+            sub.file_path.length - 3
+          );
+          return [MWCaptionType.SRT, MWCaptionType.VTT].includes(extension);
+        });
+        return {
+          needsProxy: true,
+          langIso: subtitle.language,
+          url: sub.subtitles[0].file_path,
+          type: MWCaptionType.SRT,
+        };
+      }
+    );
     return {
       embeds: [],
       stream: {
diff --git a/src/setup/locales/en/translation.json b/src/setup/locales/en/translation.json
index d1408148..1838b63c 100644
--- a/src/setup/locales/en/translation.json
+++ b/src/setup/locales/en/translation.json
@@ -80,7 +80,7 @@
       "noCaptions": "No captions",
       "linkedCaptions": "Linked captions",
       "customCaption": "Custom caption",
-      "uploadCustomCaption": "Upload caption (SRT, VTT)",
+      "uploadCustomCaption": "Upload caption",
       "noEmbeds": "No embeds were found for this source",
       "errors": {
         "loadingWentWong": "Something went wrong loading the episodes for {{seasonTitle}}",
diff --git a/src/setup/locales/fr/translation.json b/src/setup/locales/fr/translation.json
index de40a796..e5c669ce 100644
--- a/src/setup/locales/fr/translation.json
+++ b/src/setup/locales/fr/translation.json
@@ -62,7 +62,7 @@
       "noCaptions": "Pas de sous-titres",
       "linkedCaptions": "Sous-titres liés",
       "customCaption": "Sous-titres personnalisés",
-      "uploadCustomCaption": "Télécharger des sous-titres (SRT, VTT)",
+      "uploadCustomCaption": "Télécharger des sous-titres",
       "noEmbeds": "Aucun contenu intégré n'a été trouvé pour cette source",
       "errors": {
         "loadingWentWong": "Un problème est survenu lors du chargement des épisodes pour {{seasonTitle}}",
diff --git a/src/video/components/actions/CaptionRendererAction.tsx b/src/video/components/actions/CaptionRendererAction.tsx
index 6abc18c9..ab7edba0 100644
--- a/src/video/components/actions/CaptionRendererAction.tsx
+++ b/src/video/components/actions/CaptionRendererAction.tsx
@@ -1,7 +1,7 @@
 import { Transition } from "@/components/Transition";
 import { useSettings } from "@/state/settings";
-import { sanitize } from "@/backend/helpers/captions";
-import { parse, Cue } from "node-webvtt";
+import { sanitize, parseSubtitles } from "@/backend/helpers/captions";
+import { ContentCaption } from "subsrt-ts/dist/types/handler";
 import { useRef } from "react";
 import { useAsync } from "react-use";
 import { useVideoPlayerDescriptor } from "../../state/hooks";
@@ -48,16 +48,18 @@ export function CaptionRendererAction({
   const source = useSource(descriptor).source;
   const videoTime = useProgress(descriptor).time;
   const { captionSettings } = useSettings();
-  const captions = useRef<Cue[]>([]);
+  const captions = useRef<ContentCaption[]>([]);
 
   useAsync(async () => {
-    const url = source?.caption?.url;
-    if (url) {
-      // Is there a better way?
-      const result = await fetch(url);
-      // Uses UTF-8 by default
+    const blobUrl = source?.caption?.url;
+    if (blobUrl) {
+      const result = await fetch(blobUrl);
       const text = await result.text();
-      captions.current = parse(text, { strict: false }).cues;
+      try {
+        captions.current = parseSubtitles(text);
+      } catch (error) {
+        captions.current = [];
+      }
     } else {
       captions.current = [];
     }
@@ -65,8 +67,8 @@ export function CaptionRendererAction({
 
   if (!captions.current.length) return null;
   const isVisible = (start: number, end: number): boolean => {
-    const delayedStart = start + captionSettings.delay;
-    const delayedEnd = end + captionSettings.delay;
+    const delayedStart = start / 1000 + captionSettings.delay;
+    const delayedEnd = end / 1000 + captionSettings.delay;
     return (
       Math.max(0, delayedStart) <= videoTime &&
       Math.max(0, delayedEnd) >= videoTime
@@ -82,9 +84,9 @@ export function CaptionRendererAction({
       show
     >
       {captions.current.map(
-        ({ identifier, end, start, text }) =>
+        ({ start, end, content }) =>
           isVisible(start, end) && (
-            <CaptionCue key={identifier || `${start}-${end}`} text={text} />
+            <CaptionCue key={`${start}-${end}`} text={content} />
           )
       )}
     </Transition>
diff --git a/src/video/components/popouts/CaptionSelectionPopout.tsx b/src/video/components/popouts/CaptionSelectionPopout.tsx
index 9caaca96..2ae9fced 100644
--- a/src/video/components/popouts/CaptionSelectionPopout.tsx
+++ b/src/video/components/popouts/CaptionSelectionPopout.tsx
@@ -1,9 +1,9 @@
 import {
   getCaptionUrl,
-  convertCustomCaptionFileToWebVTT,
-  CUSTOM_CAPTION_ID,
+  parseSubtitles,
+  subtitleTypeList,
 } from "@/backend/helpers/captions";
-import { MWCaption } from "@/backend/helpers/streams";
+import { MWCaption, MWCaptionType } from "@/backend/helpers/streams";
 import { Icon, Icons } from "@/components/Icon";
 import { FloatingCardView } from "@/components/popout/FloatingCard";
 import { FloatingView } from "@/components/popout/FloatingView";
@@ -13,10 +13,11 @@ import { useVideoPlayerDescriptor } from "@/video/state/hooks";
 import { useControls } from "@/video/state/logic/controls";
 import { useMeta } from "@/video/state/logic/meta";
 import { useSource } from "@/video/state/logic/source";
-import { ChangeEvent, useMemo, useRef } from "react";
+import { useMemo, useRef } from "react";
 import { useTranslation } from "react-i18next";
 import { PopoutListEntry, PopoutSection } from "./PopoutUtils";
 
+const customCaption = "external-custom";
 function makeCaptionId(caption: MWCaption, isLinked: boolean): string {
   return isLinked ? `linked-${caption.langIso}` : `external-${caption.langIso}`;
 }
@@ -41,35 +42,20 @@ export function CaptionSelectionPopout(props: {
     async (caption: MWCaption, isLinked: boolean) => {
       const id = makeCaptionId(caption, isLinked);
       loadingId.current = id;
-      controls.setCaption(id, await getCaptionUrl(caption));
-      controls.closePopout();
+      const blobUrl = await getCaptionUrl(caption);
+      const result = await fetch(blobUrl);
+      const text = await result.text();
+      parseSubtitles(text); // This will throw if the file is invalid
+      controls.setCaption(id, blobUrl);
+      // sometimes this doesn't work, so we add a small delay
+      setTimeout(() => {
+        controls.closePopout();
+      }, 100);
     }
   );
 
   const currentCaption = source.source?.caption?.id;
   const customCaptionUploadElement = useRef<HTMLInputElement>(null);
-  const [setCustomCaption, loadingCustomCaption, errorCustomCaption] =
-    useLoading(async (captionFile: File) => {
-      if (
-        !captionFile.name.endsWith(".srt") &&
-        !captionFile.name.endsWith(".vtt")
-      ) {
-        throw new Error("Only SRT or VTT files are allowed");
-      }
-      controls.setCaption(
-        CUSTOM_CAPTION_ID,
-        await convertCustomCaptionFileToWebVTT(captionFile)
-      );
-      controls.closePopout();
-    });
-
-  async function handleUploadCaption(e: ChangeEvent<HTMLInputElement>) {
-    if (!e.target.files) {
-      return;
-    }
-    const captionFile = e.target.files[0];
-    setCustomCaption(captionFile);
-  }
   return (
     <FloatingView
       {...props.router.pageProps(props.prefix)}
@@ -105,23 +91,29 @@ export function CaptionSelectionPopout(props: {
             {t("videoPlayer.popouts.noCaptions")}
           </PopoutListEntry>
           <PopoutListEntry
-            key={CUSTOM_CAPTION_ID}
-            active={currentCaption === CUSTOM_CAPTION_ID}
-            loading={loadingCustomCaption}
-            errored={!!errorCustomCaption}
-            onClick={() => {
-              customCaptionUploadElement.current?.click();
-            }}
+            key={customCaption}
+            active={currentCaption === customCaption}
+            loading={loading && loadingId.current === customCaption}
+            errored={error && loadingId.current === customCaption}
+            onClick={() => customCaptionUploadElement.current?.click()}
           >
-            {currentCaption === CUSTOM_CAPTION_ID
+            {currentCaption === customCaption
               ? t("videoPlayer.popouts.customCaption")
               : t("videoPlayer.popouts.uploadCustomCaption")}
             <input
-              ref={customCaptionUploadElement}
-              type="file"
-              onChange={handleUploadCaption}
               className="hidden"
-              accept=".vtt, .srt"
+              ref={customCaptionUploadElement}
+              accept={subtitleTypeList.join(",")}
+              type="file"
+              onChange={(e) => {
+                if (!e.target.files) return;
+                const customSubtitle = {
+                  langIso: "custom",
+                  url: URL.createObjectURL(e.target.files[0]),
+                  type: MWCaptionType.UNKNOWN,
+                };
+                setCaption(customSubtitle, false);
+              }}
             />
           </PopoutListEntry>
         </PopoutSection>
diff --git a/tsconfig.json b/tsconfig.json
index a00c1a1f..e1004c43 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -16,7 +16,6 @@
     "noEmit": true,
     "jsx": "react-jsx",
     "baseUrl": "./src",
-    "typeRoots": ["./src/@types"],
     "paths": {
       "@/*": ["./*"]
     },
diff --git a/yarn.lock b/yarn.lock
index 1c29c291..48e68bc8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2123,11 +2123,6 @@ commander@^2.20.0:
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
   integrity sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==
 
-commander@^7.1.0:
-  version "7.2.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-7.2.0.tgz#a36cb57d0b501ce108e4d20559a150a391d97ab7"
-  integrity sha512-QrWXB+ZQSVPmIWIhtEO9H+gwHaMGYiF5ChvoJ+K9ZGHG/sVsa6yiesAD1GC/x46sET00Xlwo1u49RVVVzvcSkw==
-
 commander@^8.0.0:
   version "8.3.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-8.3.0.tgz#4837ea1b2da67b9c616a67afbb0fafee567bca66"
@@ -3854,13 +3849,6 @@ node-releases@^2.0.8:
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-2.0.10.tgz#c311ebae3b6a148c89b1813fd7c4d3c024ef537f"
   integrity sha512-5GFldHPXVG/YZmFzJvKK2zDSzPKhEp0+ZR5SVaoSag9fsL5YgHbUHDfnG5494ISANDcK4KwPXAx2xqVEydmd7w==
 
-node-webvtt@^1.9.4:
-  version "1.9.4"
-  resolved "https://registry.yarnpkg.com/node-webvtt/-/node-webvtt-1.9.4.tgz#b71b98f879c6c88ebeda40c358bd45a882ca5d89"
-  integrity sha512-EjrJdKdxSyd8j4LMLW6s2Ah4yNoeVXp18Ob04CQl1In18xcUmKzEE8pcsxxnFVqanTyjbGYph2VnvtwIXR4EjA==
-  dependencies:
-    commander "^7.1.0"
-
 normalize-path@^3.0.0, normalize-path@~3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-3.0.0.tgz#0dcd69ff23a1c9b11fd0978316644a0388216a65"
@@ -4699,11 +4687,6 @@ sourcemap-codec@^1.4.8:
   resolved "https://registry.yarnpkg.com/sourcemap-codec/-/sourcemap-codec-1.4.8.tgz#ea804bd94857402e6992d05a38ef1ae35a9ab4c4"
   integrity sha512-9NykojV5Uih4lgo5So5dtw+f0JgJX30KCNI8gwhz2J9A15wD0Ml6tjHKwf6fTSa6fAdVBdZeNOs9eJ71qCk8vA==
 
-srt-webvtt@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/srt-webvtt/-/srt-webvtt-2.0.0.tgz#debd2f56dd2b6600894caa11bb78893e5fc6509b"
-  integrity sha512-G2Z7/Jf2NRKrmLYNSIhSYZZYE6OFlKXFp9Au2/zJBKgrioUzmrAys1x7GT01dwl6d2sEnqr5uahEIOd0JW/Rbw==
-
 stack-generator@^2.0.5:
   version "2.0.10"
   resolved "https://registry.yarnpkg.com/stack-generator/-/stack-generator-2.0.10.tgz#8ae171e985ed62287d4f1ed55a1633b3fb53bb4d"
@@ -4859,6 +4842,11 @@ subscribe-ui-event@^2.0.6:
     lodash "^4.17.15"
     raf "^3.0.0"
 
+subsrt-ts@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/subsrt-ts/-/subsrt-ts-2.1.0.tgz#97b5e0f97800fb08b64465b53c7c4f14f43d6fd4"
+  integrity sha512-LOdp6A91l/yPLPFuEaYvGzFDusUz0J52ksZjaCFdl347DOhedZOVQEciTaH7KaVDRlb7wstOx4dPFdjf9AyuFw==
+
 supports-color@^5.3.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.5.0.tgz#e2e69a44ac8772f78a1ec0b35b689df6530efc8f"