diff --git a/prisma/migrations/20250828035734_features_thumbnails_format/migration.sql b/prisma/migrations/20250828035734_features_thumbnails_format/migration.sql
new file mode 100644
index 00000000..0ab8367f
--- /dev/null
+++ b/prisma/migrations/20250828035734_features_thumbnails_format/migration.sql
@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "public"."Zipline" ADD COLUMN     "featuresThumbnailsFormat" TEXT NOT NULL DEFAULT 'jpg';
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 2e7c1db3..d2e2cbb4 100755
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -56,6 +56,7 @@ model Zipline {
 
   featuresThumbnailsEnabled       Boolean @default(true)
   featuresThumbnailsNumberThreads Int     @default(4)
+  featuresThumbnailsFormat        String  @default("jpg")
 
   featuresMetricsEnabled          Boolean @default(true)
   featuresMetricsAdminOnly        Boolean @default(false)
diff --git a/src/components/pages/serverSettings/parts/Features.tsx b/src/components/pages/serverSettings/parts/Features.tsx
index 6824a615..6522421e 100644
--- a/src/components/pages/serverSettings/parts/Features.tsx
+++ b/src/components/pages/serverSettings/parts/Features.tsx
@@ -5,6 +5,7 @@ import {
   LoadingOverlay,
   NumberInput,
   Paper,
+  Select,
   SimpleGrid,
   Switch,
   TextInput,
@@ -33,6 +34,7 @@ export default function Features({
       featuresDeleteOnMaxViews: true,
       featuresThumbnailsEnabled: true,
       featuresThumbnailsNumberThreads: 4,
+      featuresThumbnailsFormat: 'jpg',
       featuresMetricsEnabled: true,
       featuresMetricsAdminOnly: false,
       featuresMetricsShowUserSpecific: true,
@@ -58,6 +60,7 @@ export default function Features({
       featuresDeleteOnMaxViews: data.settings.featuresDeleteOnMaxViews ?? true,
       featuresThumbnailsEnabled: data.settings.featuresThumbnailsEnabled ?? true,
       featuresThumbnailsNumberThreads: data.settings.featuresThumbnailsNumberThreads ?? 4,
+      featuresThumbnailsFormat: data.settings.featuresThumbnailsFormat ?? 'jpg',
       featuresMetricsEnabled: data.settings.featuresMetricsEnabled ?? true,
       featuresMetricsAdminOnly: data.settings.featuresMetricsAdminOnly ?? false,
       featuresMetricsShowUserSpecific: data.settings.featuresMetricsShowUserSpecific ?? true,
@@ -82,7 +85,7 @@ export default function Features({
 
           <Switch
             label='/robots.txt'
-            description='Enables a robots.txt file for search engine optimization. Requires a server restart.'
+            description='Enables a /robots.txt to stop search crawlers. Requires a server restart.'
             {...form.getInputProps('featuresRobotsTxt', { type: 'checkbox' })}
           />
 
@@ -143,6 +146,20 @@ export default function Features({
             {...form.getInputProps('featuresThumbnailsNumberThreads')}
           />
 
+          <Select
+            label='Thumbnails Format'
+            description='The output format for thumbnails. Requires a server restart.'
+            data={[
+              { value: 'jpg', label: '.jpg' },
+              { value: 'png', label: '.png' },
+              { value: 'webp', label: '.webp' },
+            ]}
+            allowDeselect={false}
+            {...form.getInputProps('featuresThumbnailsFormat')}
+          />
+
+          <div />
+
           <Switch
             label='Version Checking'
             description='Enable version checking for the server. This will check for updates and display the status on the sidebar to all users.'
diff --git a/src/lib/config/read/db.ts b/src/lib/config/read/db.ts
index f81ef7f6..3a2296de 100644
--- a/src/lib/config/read/db.ts
+++ b/src/lib/config/read/db.ts
@@ -42,6 +42,7 @@ export const DATABASE_TO_PROP = {
 
   featuresThumbnailsEnabled: 'features.thumbnails.enabled',
   featuresThumbnailsNumberThreads: 'features.thumbnails.num_threads',
+  featuresThumbnailsFormat: 'features.thumbnails.format',
 
   featuresMetricsEnabled: 'features.metrics.enabled',
   featuresMetricsAdminOnly: 'features.metrics.adminOnly',
diff --git a/src/lib/config/read/env.ts b/src/lib/config/read/env.ts
index 4712014f..21cf98a2 100644
--- a/src/lib/config/read/env.ts
+++ b/src/lib/config/read/env.ts
@@ -68,11 +68,15 @@ export const ENVS = [
   env('features.userRegistration', 'FEATURES_USER_REGISTRATION', 'boolean', true),
   env('features.oauthRegistration', 'FEATURES_OAUTH_REGISTRATION', 'boolean', true),
   env('features.deleteOnMaxViews', 'FEATURES_DELETE_ON_MAX_VIEWS', 'boolean', true),
+
   env('features.thumbnails.enabled', 'FEATURES_THUMBNAILS_ENABLED', 'boolean', true),
   env('features.thumbnails.num_threads', 'FEATURES_THUMBNAILS_NUM_THREADS', 'number', true),
+  env('features.thumbnails.format', 'FEATURES_THUMBNAILS_FORMAT', 'string', true),
+
   env('features.metrics.enabled', 'FEATURES_METRICS_ENABLED', 'boolean', true),
   env('features.metrics.adminOnly', 'FEATURES_METRICS_ADMIN_ONLY', 'boolean', true),
   env('features.metrics.showUserSpecific', 'FEATURES_METRICS_SHOW_USER_SPECIFIC', 'boolean', true),
+
   env('features.versionChecking', 'FEATURES_VERSION_CHECKING', 'boolean', true),
   env('features.versionAPI', 'FEATURES_VERSION_API', 'string', true),
 
diff --git a/src/lib/config/read/index.ts b/src/lib/config/read/index.ts
index 403204e3..1c0473ac 100755
--- a/src/lib/config/read/index.ts
+++ b/src/lib/config/read/index.ts
@@ -38,6 +38,7 @@ export const rawConfig: any = {
     removeGpsMetadata: undefined,
     randomWordsNumAdjectives: undefined,
     randomWordsSeparator: undefined,
+    defaultCompressionFormat: undefined,
   },
   urls: {
     route: undefined,
@@ -57,6 +58,7 @@ export const rawConfig: any = {
     thumbnails: {
       enabled: undefined,
       num_threads: undefined,
+      format: undefined,
     },
     metrics: {
       enabled: undefined,
diff --git a/src/lib/config/validate.ts b/src/lib/config/validate.ts
index 06a92a40..04c0dfe9 100755
--- a/src/lib/config/validate.ts
+++ b/src/lib/config/validate.ts
@@ -160,6 +160,7 @@ export const schema = z.object({
     thumbnails: z.object({
       enabled: z.boolean().default(true),
       num_threads: z.number().default(4),
+      format: z.enum(['jpg', 'png', 'webp']).default('jpg'),
     }),
     metrics: z.object({
       enabled: z.boolean().default(true),
diff --git a/src/offload/thumbnails.ts b/src/offload/thumbnails.ts
index d4346797..57963279 100755
--- a/src/offload/thumbnails.ts
+++ b/src/offload/thumbnails.ts
@@ -34,13 +34,22 @@ if (!enabled) {
 
 logger.debug('started thumbnail worker');
 
-function genThumbnail(file: string, thumbnailTmp: string): Promise<Buffer | undefined> {
+const formatMimes = {
+  jpg: 'image/jpeg',
+  png: 'image/png',
+  webp: 'image/webp',
+};
+
+function name(str: string) {
+  return `${str}.${config.features.thumbnails.format}`;
+}
+
+function genThumbnail(input: string, output: string): Promise<Buffer | undefined> {
   return new Promise((resolve, reject) => {
-    ffmpeg(file)
+    ffmpeg(input)
       .videoFilters('thumbnail')
       .frames(1)
-      .format('mjpeg')
-      .output(thumbnailTmp)
+      .output(output)
       .on('start', (cmd) => {
         logger.debug('generating thumbnail', { cmd });
       })
@@ -51,7 +60,7 @@ function genThumbnail(file: string, thumbnailTmp: string): Promise<Buffer | unde
           // the method will return an empty buffer since there is no video stream
 
           logger.error(
-            `file ${file} does not contain any video stream, it is probably an audio file... ignoring...`,
+            `file ${input} does not contain any video stream, it is probably an audio file... ignoring...`,
           );
           resolve(Buffer.alloc(0));
         }
@@ -60,17 +69,17 @@ function genThumbnail(file: string, thumbnailTmp: string): Promise<Buffer | unde
         reject(err);
       })
       .on('end', () => {
-        if (!existsSync(thumbnailTmp)) {
-          logger.error('expected thumbnail file does not exist', { thumbnailTmp });
-          unlinkSync(file);
+        if (!existsSync(output)) {
+          logger.error('expected thumbnail file does not exist', { thumbnailTmp: output });
+          unlinkSync(input);
           return resolve(undefined);
         }
 
-        const buffer = readFileSync(thumbnailTmp);
+        const buffer = readFileSync(output);
 
-        unlinkSync(thumbnailTmp);
-        unlinkSync(file);
-        logger.debug('removed temporary files', { file, thumbnail: thumbnailTmp });
+        unlinkSync(output);
+        unlinkSync(input);
+        logger.debug('removed temporary files', { file: input, thumbnail: output });
 
         resolve(buffer);
       })
@@ -107,17 +116,17 @@ async function generate(config: Config, datasource: Datasource, ids: string[]) {
       writeStream.on('finish', resolve as any);
     });
 
-    const thumbnailTmpFile = join(config.core.tempDirectory, `zthumbnail_${file.id}.jpg`);
+    const thumbnailTmpFile = join(config.core.tempDirectory, name(`zthumbnail_${file.id}`));
     const thumbnail = await genThumbnail(tmpFile, thumbnailTmpFile);
     if (!thumbnail) return;
 
-    const existing = await datasource.size(`.thumbnail.${file.id}.jpg`);
+    const existing = await datasource.size(name(`.thumbnail.${file.id}`));
     if (existing || existing === 0) {
-      await datasource.delete(`.thumbnail.${file.id}.jpg`);
+      await datasource.delete(name(`.thumbnail.${file.id}`));
     }
 
-    await datasource.put(`.thumbnail.${file.id}.jpg`, thumbnail, {
-      mimetype: 'image/jpeg',
+    await datasource.put(name(`.thumbnail.${file.id}`), thumbnail, {
+      mimetype: formatMimes[config.features.thumbnails.format] || 'image/jpeg',
     });
 
     const existingThumbnail = await dbProxy<ThumbnailId>('thumbnail.findFirst', {
@@ -131,7 +140,7 @@ async function generate(config: Config, datasource: Datasource, ids: string[]) {
       t = await dbProxy<ThumbnailId>('thumbnail.create', {
         data: {
           fileId: file.id,
-          path: `.thumbnail.${file.id}.jpg`,
+          path: name(`.thumbnail.${file.id}`),
         },
       });
     } else {
diff --git a/src/server/routes/api/server/settings/index.ts b/src/server/routes/api/server/settings/index.ts
index 8c8ce337..97fa5ec5 100644
--- a/src/server/routes/api/server/settings/index.ts
+++ b/src/server/routes/api/server/settings/index.ts
@@ -182,6 +182,7 @@ export default fastifyPlugin(
                 cpus().length,
                 'Number of threads must be less than or equal to the number of CPUs: ' + cpus().length,
               ),
+            featuresThumbnailsFormat: z.enum(['jpg', 'png', 'webp']),
 
             featuresMetricsEnabled: z.boolean(),
             featuresMetricsAdminOnly: z.boolean(),