diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index fb10c6d3..5351924f 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -109,6 +109,9 @@ importers:
       '@vitejs/plugin-basic-ssl':
         specifier: ^1.1.0
         version: 1.1.0(vite@5.3.5(@types/node@20.14.14))
+      mime:
+        specifier: ^4.0.4
+        version: 4.0.4
       sveltekit-i18n:
         specifier: ^2.4.2
         version: 2.4.2(svelte@4.2.18)
@@ -1591,6 +1594,11 @@ packages:
     engines: {node: '>=4'}
     hasBin: true
 
+  mime@4.0.4:
+    resolution: {integrity: sha512-v8yqInVjhXyqP6+Kw4fV3ZzeMRqEW6FotRsKXjRS5VMTNIuXsdRoAvklpoRgSqXm6o9VNH4/C0mgedko9DdLsQ==}
+    engines: {node: '>=16'}
+    hasBin: true
+
   mimic-fn@2.1.0:
     resolution: {integrity: sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==}
     engines: {node: '>=6'}
@@ -3583,6 +3591,8 @@ snapshots:
 
   mime@1.6.0: {}
 
+  mime@4.0.4: {}
+
   mimic-fn@2.1.0: {}
 
   min-indent@1.0.1: {}
diff --git a/web/package.json b/web/package.json
index 9722e8d7..97650ff2 100644
--- a/web/package.json
+++ b/web/package.json
@@ -51,6 +51,7 @@
         "@imput/version-info": "workspace:^",
         "@tabler/icons-svelte": "3.6.0",
         "@vitejs/plugin-basic-ssl": "^1.1.0",
+        "mime": "^4.0.4",
         "sveltekit-i18n": "^2.4.2",
         "ts-deepmerge": "^7.0.0"
     }
diff --git a/web/src/lib/ffmpeg.ts b/web/src/lib/ffmpeg.ts
index c2f8899d..c5536629 100644
--- a/web/src/lib/ffmpeg.ts
+++ b/web/src/lib/ffmpeg.ts
@@ -1,19 +1,20 @@
+import { FFmpeg } from "@imput/ffmpeg.wasm";
 import ffmpegCore from "@imput/ffmpeg-core?url";
 import ffmpegCoreWASM from "@imput/ffmpeg-core/wasm?url";
 
-import { FFmpeg } from "@imput/ffmpeg.wasm";
-import { fetchFile } from "@imput/ffmpeg-util";
+import mime from "mime";
 
-type renderParams = {
-    url: string,
-    input: {
-        type: string,
-        format: string,
-    },
-    output: {
-        type: string,
-        format: string,
-    },
+type InputFileKind = "video" | "audio";
+
+type FileInfo = {
+    type?: string | null,
+    kind: InputFileKind,
+    extension: string,
+}
+
+type RenderParams = {
+    file: File,
+    output?: FileInfo,
     args: string[],
 }
 
@@ -51,26 +52,41 @@ export default class FFmpegWrapper {
         return this.ffmpeg.terminate();
     }
 
-    async renderFile({ url, input, output, args }: renderParams) {
-        const inputFile = `input.${input.format}`;
+    async renderFile({ file, output, args }: RenderParams) {
+        const inputKind = file.type.split("/")[0];
+        const inputExtension = mime.getExtension(file.type);
 
+        if (inputKind !== "video" && inputKind !== "audio") return;
+        if (!inputExtension) return;
+
+        const input: FileInfo = {
+            kind: inputKind,
+            extension: inputExtension,
+        }
+
+        if (!output) output = input;
+
+        output.type = mime.getType(output.extension);
+        if (!output.type) return;
+
+        const buffer = new Uint8Array(await file.arrayBuffer());
         await this.ffmpeg.writeFile(
-            inputFile,
-            await fetchFile(url)
-        )
+            'input',
+            buffer
+        );
 
         await this.ffmpeg.exec([
             '-threads', this.concurrency.toString(),
-            '-i', inputFile,
+            '-i', 'input',
             ...args,
-            `output.${output.format}`
+            `output.${output.extension}`
         ]);
 
-        const data = await this.ffmpeg.readFile(`output.${output.format}`);
-        const finalBlob = URL.createObjectURL(
-            new Blob([data], { type: `${output.type}/${output.format}` })
+        const renderBlob = new Blob(
+            [await this.ffmpeg.readFile(`output.${output.extension}`)],
+            { type: output.type }
         );
 
-        return finalBlob
+        return renderBlob;
     }
 }