diff --git a/CHANGELOG.md b/CHANGELOG.md
index 42d8e77e9e..302e8918a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ Translations: [简体中文](CHANGELOG_zh.md)
 
 * fix: Fixed a bug where SkiaAnimatedImagePainter crashed when encountering disguised gif
   images. [#205](https://github.com/panpf/sketch/issues/205)
+* improve: Improve the accuracy of animation-related Decoder in determining the image type. No
+  longer rely on the mimeType attribute of FetchResult because it may be inaccurate.
 
 # 4.0.0-alpha05
 
diff --git a/CHANGELOG_zh.md b/CHANGELOG_zh.md
index 2bd0c26776..23ab183a41 100644
--- a/CHANGELOG_zh.md
+++ b/CHANGELOG_zh.md
@@ -10,6 +10,8 @@
 
 * fix: 修复 SkiaAnimatedImagePainter 在遇到伪装的 gif 图片时崩溃的
   bug。[#205](https://github.com/panpf/sketch/issues/205)
+* improve: 改进动图相关 Decoder 在判断图片类型时的准确性，不再依赖 FetchResult 的 mimeType
+  属性，因为它可能不准确
 
 # 4.0.0-alpha05
 
diff --git a/sketch-animated-koralgif/src/androidTest/kotlin/com/github/panpf/sketch/animated/koralgif/test/decode/GifDrawableDecoderTest.kt b/sketch-animated-koralgif/src/androidTest/kotlin/com/github/panpf/sketch/animated/koralgif/test/decode/GifDrawableDecoderTest.kt
index 937295cfba..f3ca388484 100644
--- a/sketch-animated-koralgif/src/androidTest/kotlin/com/github/panpf/sketch/animated/koralgif/test/decode/GifDrawableDecoderTest.kt
+++ b/sketch-animated-koralgif/src/androidTest/kotlin/com/github/panpf/sketch/animated/koralgif/test/decode/GifDrawableDecoderTest.kt
@@ -25,6 +25,7 @@ import com.github.panpf.sketch.decode.internal.createInSampledTransformed
 import com.github.panpf.sketch.decode.supportKoralGif
 import com.github.panpf.sketch.drawable.AnimatableDrawable
 import com.github.panpf.sketch.drawable.GifDrawableWrapperDrawable
+import com.github.panpf.sketch.fetch.FetchResult
 import com.github.panpf.sketch.fetch.copy
 import com.github.panpf.sketch.getDrawableOrThrow
 import com.github.panpf.sketch.images.ResourceImages
@@ -33,6 +34,7 @@ import com.github.panpf.sketch.request.animatedTransformation
 import com.github.panpf.sketch.request.onAnimationEnd
 import com.github.panpf.sketch.request.onAnimationStart
 import com.github.panpf.sketch.request.repeatCount
+import com.github.panpf.sketch.source.AssetDataSource
 import com.github.panpf.sketch.source.DataFrom.LOCAL
 import com.github.panpf.sketch.test.singleton.sketch
 import com.github.panpf.sketch.test.utils.decode
@@ -140,6 +142,18 @@ class GifDrawableDecoderTest {
         }.apply {
             Assert.assertNull(this)
         }
+
+        // Disguised, mimeType; data error
+        ImageRequest(context, ResourceImages.png.uri).let {
+            val fetchResult =
+                FetchResult(
+                    AssetDataSource(sketch, it, ResourceImages.png.resourceName),
+                    "image/gif"
+                )
+            factory.create(it.toRequestContext(sketch), fetchResult)
+        }.apply {
+            Assert.assertNull(this)
+        }
     }
 
     @Test
diff --git a/sketch-animated-koralgif/src/main/kotlin/com/github/panpf/sketch/decode/GifDrawableDecoder.kt b/sketch-animated-koralgif/src/main/kotlin/com/github/panpf/sketch/decode/GifDrawableDecoder.kt
index d4c1d82e54..2ed5dcba07 100644
--- a/sketch-animated-koralgif/src/main/kotlin/com/github/panpf/sketch/decode/GifDrawableDecoder.kt
+++ b/sketch-animated-koralgif/src/main/kotlin/com/github/panpf/sketch/decode/GifDrawableDecoder.kt
@@ -22,14 +22,13 @@ import android.graphics.Rect
 import androidx.annotation.WorkerThread
 import com.github.panpf.sketch.ComponentRegistry
 import com.github.panpf.sketch.asSketchImage
-import com.github.panpf.sketch.source.DataSource
 import com.github.panpf.sketch.decode.internal.ImageFormat
 import com.github.panpf.sketch.decode.internal.calculateSampleSize
 import com.github.panpf.sketch.decode.internal.createInSampledTransformed
 import com.github.panpf.sketch.decode.internal.isGif
 import com.github.panpf.sketch.decode.internal.isSmallerSizeMode
-import com.github.panpf.sketch.drawable.GifDrawableWrapperDrawable
 import com.github.panpf.sketch.drawable.AnimatableDrawable
+import com.github.panpf.sketch.drawable.GifDrawableWrapperDrawable
 import com.github.panpf.sketch.fetch.FetchResult
 import com.github.panpf.sketch.request.ANIMATION_REPEAT_INFINITE
 import com.github.panpf.sketch.request.animatable2CompatCallbackOf
@@ -38,6 +37,7 @@ import com.github.panpf.sketch.request.animationEndCallback
 import com.github.panpf.sketch.request.animationStartCallback
 import com.github.panpf.sketch.request.internal.RequestContext
 import com.github.panpf.sketch.request.repeatCount
+import com.github.panpf.sketch.source.DataSource
 import com.github.panpf.sketch.util.Size
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
@@ -85,7 +85,7 @@ class GifDrawableDecoder(
             height = imageHeight,
             mimeType = ImageFormat.GIF.mimeType,
         )
-        val resize= requestContext.computeResize(imageInfo.size)
+        val resize = requestContext.computeResize(imageInfo.size)
         val inSampleSize = calculateSampleSize(
             imageSize = imageSize,
             targetSize = size,
@@ -144,12 +144,11 @@ class GifDrawableDecoder(
             requestContext: RequestContext,
             fetchResult: FetchResult
         ): Decoder? {
-            if (!requestContext.request.disallowAnimatedImage) {
-                val imageFormat = ImageFormat.parseMimeType(fetchResult.mimeType)
-                val isGif = imageFormat == ImageFormat.GIF || fetchResult.headerBytes.isGif()
-                if (isGif) {
-                    return GifDrawableDecoder(requestContext, fetchResult.dataSource)
-                }
+            if (
+                !requestContext.request.disallowAnimatedImage
+                && fetchResult.headerBytes.isGif()
+            ) {
+                return GifDrawableDecoder(requestContext, fetchResult.dataSource)
             }
             return null
         }
diff --git a/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/GifAnimatedDecoderTest.kt b/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/GifAnimatedDecoderTest.kt
index 47c30467dc..05be148f1d 100644
--- a/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/GifAnimatedDecoderTest.kt
+++ b/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/GifAnimatedDecoderTest.kt
@@ -151,6 +151,18 @@ class GifAnimatedDecoderTest {
         }.apply {
             Assert.assertNull(this)
         }
+
+        // Disguised, mimeType; data error
+        ImageRequest(context, ResourceImages.png.uri).let {
+            val fetchResult =
+                FetchResult(
+                    AssetDataSource(sketch, it, ResourceImages.png.resourceName),
+                    "image/gif"
+                )
+            factory.create(it.toRequestContext(sketch), fetchResult)
+        }.apply {
+            Assert.assertNull(this)
+        }
     }
 
     @Test
diff --git a/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/GifMovieDecoderTest.kt b/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/GifMovieDecoderTest.kt
index a7bb921314..1f07125771 100644
--- a/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/GifMovieDecoderTest.kt
+++ b/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/GifMovieDecoderTest.kt
@@ -149,6 +149,18 @@ class GifMovieDecoderTest {
         }.apply {
             Assert.assertNull(this)
         }
+
+        // Disguised, mimeType; data error
+        ImageRequest(context, ResourceImages.png.uri).let {
+            val fetchResult =
+                FetchResult(
+                    AssetDataSource(sketch, it, ResourceImages.png.resourceName),
+                    "image/gif"
+                )
+            factory.create(it.toRequestContext(sketch), fetchResult)
+        }.apply {
+            Assert.assertNull(this)
+        }
     }
 
     @Test
diff --git a/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/HeifAnimatedDecoderTest.kt b/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/HeifAnimatedDecoderTest.kt
index 19a03fbf9d..64515ab71e 100644
--- a/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/HeifAnimatedDecoderTest.kt
+++ b/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/HeifAnimatedDecoderTest.kt
@@ -158,6 +158,18 @@ class HeifAnimatedDecoderTest {
                 "image/jpeg",
             )
             factory.create(it.toRequestContext(sketch), fetchResult)
+        }.apply {
+            Assert.assertNotNull(this)
+        }
+
+        // Disguised, mimeType; data error
+        ImageRequest(context, ResourceImages.png.uri).let {
+            val fetchResult =
+                FetchResult(
+                    AssetDataSource(sketch, it, ResourceImages.png.resourceName),
+                    "image/heif"
+                )
+            factory.create(it.toRequestContext(sketch), fetchResult)
         }.apply {
             Assert.assertNull(this)
         }
diff --git a/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/WebpAnimatedDecoderTest.kt b/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/WebpAnimatedDecoderTest.kt
index 002294a6a1..f8a3bca9e6 100644
--- a/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/WebpAnimatedDecoderTest.kt
+++ b/sketch-animated/src/androidInstrumentedTest/kotlin/com/github/panpf/sketch/animated/android/test/decode/WebpAnimatedDecoderTest.kt
@@ -158,6 +158,18 @@ class WebpAnimatedDecoderTest {
                 "image/jpeg",
             )
             factory.create(it.toRequestContext(sketch), fetchResult)
+        }.apply {
+            Assert.assertNotNull(this)
+        }
+
+        // Disguised, mimeType; data error
+        ImageRequest(context, ResourceImages.png.uri).let {
+            val fetchResult =
+                FetchResult(
+                    AssetDataSource(sketch, it, ResourceImages.png.resourceName),
+                    "image/webp"
+                )
+            factory.create(it.toRequestContext(sketch), fetchResult)
         }.apply {
             Assert.assertNull(this)
         }
diff --git a/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/GifAnimatedDecoder.kt b/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/GifAnimatedDecoder.kt
index 6a5f126442..0c86aaa5cd 100644
--- a/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/GifAnimatedDecoder.kt
+++ b/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/GifAnimatedDecoder.kt
@@ -18,12 +18,11 @@ package com.github.panpf.sketch.decode
 import android.os.Build
 import androidx.annotation.RequiresApi
 import com.github.panpf.sketch.ComponentRegistry
-import com.github.panpf.sketch.source.DataSource
 import com.github.panpf.sketch.decode.internal.ImageDecoderAnimatedDecoder
-import com.github.panpf.sketch.decode.internal.ImageFormat
 import com.github.panpf.sketch.decode.internal.isGif
 import com.github.panpf.sketch.fetch.FetchResult
 import com.github.panpf.sketch.request.internal.RequestContext
+import com.github.panpf.sketch.source.DataSource
 
 /**
  * Adds gif support by AnimatedImageDrawable
@@ -62,12 +61,9 @@ class GifAnimatedDecoder(
             if (
                 Build.VERSION.SDK_INT >= Build.VERSION_CODES.P
                 && !requestContext.request.disallowAnimatedImage
+                && fetchResult.headerBytes.isGif()
             ) {
-                val imageFormat = ImageFormat.parseMimeType(fetchResult.mimeType)
-                val isGif = imageFormat == ImageFormat.GIF || fetchResult.headerBytes.isGif()
-                if (isGif) {
-                    return GifAnimatedDecoder(requestContext, dataSource)
-                }
+                return GifAnimatedDecoder(requestContext, dataSource)
             }
             return null
         }
diff --git a/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/GifMovieDecoder.kt b/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/GifMovieDecoder.kt
index d6b504461d..e3ffb92591 100644
--- a/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/GifMovieDecoder.kt
+++ b/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/GifMovieDecoder.kt
@@ -22,21 +22,21 @@ import android.os.Build
 import androidx.annotation.RequiresApi
 import androidx.annotation.WorkerThread
 import com.github.panpf.sketch.ComponentRegistry
-import com.github.panpf.sketch.source.DataSource
+import com.github.panpf.sketch.asSketchImage
 import com.github.panpf.sketch.decode.internal.ImageFormat
 import com.github.panpf.sketch.decode.internal.isGif
-import com.github.panpf.sketch.drawable.MovieDrawable
 import com.github.panpf.sketch.drawable.AnimatableDrawable
+import com.github.panpf.sketch.drawable.MovieDrawable
 import com.github.panpf.sketch.fetch.FetchResult
 import com.github.panpf.sketch.request.ANIMATION_REPEAT_INFINITE
 import com.github.panpf.sketch.request.animatable2CompatCallbackOf
 import com.github.panpf.sketch.request.animatedTransformation
 import com.github.panpf.sketch.request.animationEndCallback
 import com.github.panpf.sketch.request.animationStartCallback
-import com.github.panpf.sketch.asSketchImage
 import com.github.panpf.sketch.request.bitmapConfig
 import com.github.panpf.sketch.request.internal.RequestContext
 import com.github.panpf.sketch.request.repeatCount
+import com.github.panpf.sketch.source.DataSource
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import okio.buffer
@@ -68,7 +68,8 @@ class GifMovieDecoder(
     @WorkerThread
     override suspend fun decode(): Result<DecodeResult> = kotlin.runCatching {
         val request = requestContext.request
-        val movie: Movie? = dataSource.openSource().buffer().inputStream().use { Movie.decodeStream(it) }
+        val movie: Movie? =
+            dataSource.openSource().buffer().inputStream().use { Movie.decodeStream(it) }
 
         val width = movie?.width() ?: 0
         val height = movie?.height() ?: 0
@@ -123,14 +124,12 @@ class GifMovieDecoder(
             fetchResult: FetchResult
         ): Decoder? {
             val dataSource = fetchResult.dataSource
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
+            if (
+                Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
                 && !requestContext.request.disallowAnimatedImage
+                && fetchResult.headerBytes.isGif()
             ) {
-                val imageFormat = ImageFormat.parseMimeType(fetchResult.mimeType)
-                val isGif = imageFormat == ImageFormat.GIF || fetchResult.headerBytes.isGif()
-                if (isGif) {
-                    return GifMovieDecoder(requestContext, dataSource)
-                }
+                return GifMovieDecoder(requestContext, dataSource)
             }
             return null
         }
diff --git a/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/HeifAnimatedDecoder.kt b/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/HeifAnimatedDecoder.kt
index 09be8b1be9..5450675044 100644
--- a/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/HeifAnimatedDecoder.kt
+++ b/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/HeifAnimatedDecoder.kt
@@ -18,12 +18,11 @@ package com.github.panpf.sketch.decode
 import android.os.Build
 import androidx.annotation.RequiresApi
 import com.github.panpf.sketch.ComponentRegistry
-import com.github.panpf.sketch.source.DataSource
 import com.github.panpf.sketch.decode.internal.ImageDecoderAnimatedDecoder
-import com.github.panpf.sketch.decode.internal.ImageFormat
 import com.github.panpf.sketch.decode.internal.isAnimatedHeif
 import com.github.panpf.sketch.fetch.FetchResult
 import com.github.panpf.sketch.request.internal.RequestContext
+import com.github.panpf.sketch.source.DataSource
 
 /**
  * Adds animation heif support by AnimatedImageDrawable
@@ -62,13 +61,9 @@ class HeifAnimatedDecoder(
             if (
                 Build.VERSION.SDK_INT >= Build.VERSION_CODES.R
                 && !requestContext.request.disallowAnimatedImage
+                && fetchResult.headerBytes.isAnimatedHeif()
             ) {
-                val imageFormat = ImageFormat.parseMimeType(fetchResult.mimeType)
-                if ((imageFormat == null || imageFormat == ImageFormat.HEIC || imageFormat == ImageFormat.HEIF)
-                    && fetchResult.headerBytes.isAnimatedHeif()
-                ) {
-                    return HeifAnimatedDecoder(requestContext, dataSource)
-                }
+                return HeifAnimatedDecoder(requestContext, dataSource)
             }
             return null
         }
diff --git a/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/WebpAnimatedDecoder.kt b/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/WebpAnimatedDecoder.kt
index fe6ef6541e..5e0a3d33d9 100644
--- a/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/WebpAnimatedDecoder.kt
+++ b/sketch-animated/src/androidMain/kotlin/com/github/panpf/sketch/decode/WebpAnimatedDecoder.kt
@@ -18,12 +18,11 @@ package com.github.panpf.sketch.decode
 import android.os.Build
 import androidx.annotation.RequiresApi
 import com.github.panpf.sketch.ComponentRegistry
-import com.github.panpf.sketch.source.DataSource
 import com.github.panpf.sketch.decode.internal.ImageDecoderAnimatedDecoder
-import com.github.panpf.sketch.decode.internal.ImageFormat
 import com.github.panpf.sketch.decode.internal.isAnimatedWebP
 import com.github.panpf.sketch.fetch.FetchResult
 import com.github.panpf.sketch.request.internal.RequestContext
+import com.github.panpf.sketch.source.DataSource
 
 /**
  * Adds animation webp support by AnimatedImageDrawable
@@ -62,11 +61,9 @@ class WebpAnimatedDecoder(
             if (
                 Build.VERSION.SDK_INT >= Build.VERSION_CODES.P
                 && !requestContext.request.disallowAnimatedImage
+                && fetchResult.headerBytes.isAnimatedWebP()
             ) {
-                val imageFormat = ImageFormat.parseMimeType(fetchResult.mimeType)
-                if ((imageFormat == null || imageFormat == ImageFormat.WEBP) && fetchResult.headerBytes.isAnimatedWebP()) {
-                    return WebpAnimatedDecoder(requestContext, dataSource)
-                }
+                return WebpAnimatedDecoder(requestContext, dataSource)
             }
             return null
         }
diff --git a/sketch-animated/src/nonAndroidMain/kotlin/com/github/panpf/sketch/decode/GifSkiaAnimatedDecoder.kt b/sketch-animated/src/nonAndroidMain/kotlin/com/github/panpf/sketch/decode/GifSkiaAnimatedDecoder.kt
index c5ffff9be9..acb3a1a093 100644
--- a/sketch-animated/src/nonAndroidMain/kotlin/com/github/panpf/sketch/decode/GifSkiaAnimatedDecoder.kt
+++ b/sketch-animated/src/nonAndroidMain/kotlin/com/github/panpf/sketch/decode/GifSkiaAnimatedDecoder.kt
@@ -1,12 +1,11 @@
 package com.github.panpf.sketch.decode
 
 import com.github.panpf.sketch.ComponentRegistry
-import com.github.panpf.sketch.source.DataSource
 import com.github.panpf.sketch.decode.internal.SkiaAnimatedDecoder
-import com.github.panpf.sketch.decode.internal.ImageFormat
 import com.github.panpf.sketch.decode.internal.isGif
 import com.github.panpf.sketch.fetch.FetchResult
 import com.github.panpf.sketch.request.internal.RequestContext
+import com.github.panpf.sketch.source.DataSource
 
 /**
  * Adds gif support by Skia
@@ -25,12 +24,11 @@ class GifSkiaAnimatedDecoder(
         override val key: String = "GifSkiaAnimatedDecoder"
 
         override fun create(requestContext: RequestContext, fetchResult: FetchResult): Decoder? {
-            if (!requestContext.request.disallowAnimatedImage) {
-                val imageFormat = ImageFormat.parseMimeType(fetchResult.mimeType)
-                val isGif = imageFormat == ImageFormat.GIF || fetchResult.headerBytes.isGif()
-                if (isGif) {
-                    return GifSkiaAnimatedDecoder(requestContext, fetchResult.dataSource)
-                }
+            if (
+                !requestContext.request.disallowAnimatedImage
+                && fetchResult.headerBytes.isGif()
+            ) {
+                return GifSkiaAnimatedDecoder(requestContext, fetchResult.dataSource)
             }
             return null
         }
diff --git a/sketch-animated/src/nonAndroidMain/kotlin/com/github/panpf/sketch/decode/WebpSkiaAnimatedDecoder.kt b/sketch-animated/src/nonAndroidMain/kotlin/com/github/panpf/sketch/decode/WebpSkiaAnimatedDecoder.kt
index 637916f6ed..d06f91eac3 100644
--- a/sketch-animated/src/nonAndroidMain/kotlin/com/github/panpf/sketch/decode/WebpSkiaAnimatedDecoder.kt
+++ b/sketch-animated/src/nonAndroidMain/kotlin/com/github/panpf/sketch/decode/WebpSkiaAnimatedDecoder.kt
@@ -1,12 +1,11 @@
 package com.github.panpf.sketch.decode
 
 import com.github.panpf.sketch.ComponentRegistry
-import com.github.panpf.sketch.source.DataSource
 import com.github.panpf.sketch.decode.internal.SkiaAnimatedDecoder
-import com.github.panpf.sketch.decode.internal.ImageFormat
 import com.github.panpf.sketch.decode.internal.isAnimatedWebP
 import com.github.panpf.sketch.fetch.FetchResult
 import com.github.panpf.sketch.request.internal.RequestContext
+import com.github.panpf.sketch.source.DataSource
 
 /**
  * Adds animation webp support by Skia
@@ -25,13 +24,11 @@ class WebpSkiaAnimatedDecoder(
         override val key: String = "WebpSkiaAnimatedDecoder"
 
         override fun create(requestContext: RequestContext, fetchResult: FetchResult): Decoder? {
-            if (!requestContext.request.disallowAnimatedImage) {
-                val imageFormat = ImageFormat.parseMimeType(fetchResult.mimeType)
-                val isAnimatedWebp =
-                    (imageFormat == null || imageFormat == ImageFormat.WEBP) && fetchResult.headerBytes.isAnimatedWebP()
-                if (isAnimatedWebp) {
-                    return WebpSkiaAnimatedDecoder(requestContext, fetchResult.dataSource)
-                }
+            if (
+                !requestContext.request.disallowAnimatedImage
+                && fetchResult.headerBytes.isAnimatedWebP()
+            ) {
+                return WebpSkiaAnimatedDecoder(requestContext, fetchResult.dataSource)
             }
             return null
         }
diff --git a/sketch-core/src/commonMain/kotlin/com/github/panpf/sketch/fetch/FetchResult.kt b/sketch-core/src/commonMain/kotlin/com/github/panpf/sketch/fetch/FetchResult.kt
index 2e11c4bcd5..afe5741a4d 100644
--- a/sketch-core/src/commonMain/kotlin/com/github/panpf/sketch/fetch/FetchResult.kt
+++ b/sketch-core/src/commonMain/kotlin/com/github/panpf/sketch/fetch/FetchResult.kt
@@ -35,6 +35,9 @@ interface FetchResult {
 
     val dataSource: DataSource
 
+    /**
+     * This mimeType is extracted from the uri and may not be accurate
+     */
     val mimeType: String?
 
     val dataFrom: DataFrom
diff --git a/sketch-svg/src/commonMain/kotlin/com/github/panpf/sketch/decode/SvgDecoder.kt b/sketch-svg/src/commonMain/kotlin/com/github/panpf/sketch/decode/SvgDecoder.kt
index 53651b40b5..2f2c3c0ab4 100644
--- a/sketch-svg/src/commonMain/kotlin/com/github/panpf/sketch/decode/SvgDecoder.kt
+++ b/sketch-svg/src/commonMain/kotlin/com/github/panpf/sketch/decode/SvgDecoder.kt
@@ -67,10 +67,7 @@ class SvgDecoder(
             fetchResult: FetchResult
         ): SvgDecoder? {
             val dataSource = fetchResult.dataSource
-            return if (
-                MIME_TYPE.equals(fetchResult.mimeType, ignoreCase = true)
-                || fetchResult.headerBytes.isSvg()
-            ) {
+            return if (fetchResult.headerBytes.isSvg()) {
                 SvgDecoder(
                     requestContext = requestContext,
                     dataSource = dataSource,
diff --git a/sketch-svg/src/commonTest/kotlin/com/github/panpf/sketch/svg/test/decode/SvgDecoderTest.kt b/sketch-svg/src/commonTest/kotlin/com/github/panpf/sketch/svg/test/decode/SvgDecoderTest.kt
index 534c07706a..9f1902f9f1 100644
--- a/sketch-svg/src/commonTest/kotlin/com/github/panpf/sketch/svg/test/decode/SvgDecoderTest.kt
+++ b/sketch-svg/src/commonTest/kotlin/com/github/panpf/sketch/svg/test/decode/SvgDecoderTest.kt
@@ -130,6 +130,15 @@ class SvgDecoderTest {
         }.apply {
             assertNotNull(this)
         }
+
+        // Disguised, mimeType; data error
+        ImageRequest(context, ResourceImages.png.uri).let {
+            val fetchResult = sketch.components.newFetcherOrThrow(it).fetch().getOrThrow()
+                .copy(mimeType = "image/svg+xml")
+            factory.create(it.toRequestContext(sketch), fetchResult)
+        }.apply {
+            assertNull(this)
+        }
     }
 
     @Test