diff --git a/.changeset/small-views-battle.md b/.changeset/small-views-battle.md
new file mode 100644
index 00000000..337a8fdb
--- /dev/null
+++ b/.changeset/small-views-battle.md
@@ -0,0 +1,5 @@
+---
+"@imgproxy/imgproxy-js-core": minor
+---
+
+Add [avifo](https://docs.imgproxy.net/latest/usage/processing#avif-options) option support
diff --git a/src/options/avifOptions.ts b/src/options/avifOptions.ts
new file mode 100644
index 00000000..b464642b
--- /dev/null
+++ b/src/options/avifOptions.ts
@@ -0,0 +1,32 @@
+import type { AvifOptions, AvifOptionsPartial } from "../types/avifOptions";
+import { guardIsUndef, guardIsValidVal } from "../utils";
+
+const correctOptions = {
+  auto: true,
+  on: true,
+  off: true,
+};
+
+const getOpt = (options: AvifOptionsPartial): AvifOptions | undefined =>
+  options.avif_options || options.avifo;
+
+const test = (options: AvifOptionsPartial): boolean => Boolean(getOpt(options));
+
+const build = (options: AvifOptionsPartial): string => {
+  const avifOptions = getOpt(options);
+  let subsample: string;
+
+  guardIsUndef(avifOptions, "avif_options");
+
+  if (typeof avifOptions === "string") {
+    subsample = avifOptions;
+  } else {
+    subsample = avifOptions.subsample;
+  }
+
+  guardIsValidVal(correctOptions, subsample, "avif_options");
+
+  return `avifo:${subsample}`;
+};
+
+export { test, build };
diff --git a/src/options/index.ts b/src/options/index.ts
index 08a16a31..e33f036e 100644
--- a/src/options/index.ts
+++ b/src/options/index.ts
@@ -1,6 +1,7 @@
 export * as adjust from "./adjust";
 export * as autoquality from "./autoquality";
 export * as autoRotate from "./autoRotate";
+export * as avifOptions from "./avifOptions";
 export * as background from "./background";
 export * as backgroundAlpha from "./backgroundAlpha";
 export * as blur from "./blur";
diff --git a/src/types/avifOptions.ts b/src/types/avifOptions.ts
new file mode 100644
index 00000000..95c6f1f5
--- /dev/null
+++ b/src/types/avifOptions.ts
@@ -0,0 +1,39 @@
+/**
+ * Available AVIF subsample values:
+ * - `"auto"` - (default) use subsampling when the image is saved with quality less than 90
+ * - `"on"` - always apply subsampling
+ * - `"off"` - never apply subsampling
+ */
+type AvifSubsampleOptions = "auto" | "on" | "off";
+
+/**
+ * *AVIF options*. **PRO feature**
+ *
+ * Allows redefining AVIF saving options.
+ *
+ * @default "auto"
+ *
+ * @see {@link https://docs.imgproxy.net/generating_the_url?id=avif-options | AVIF options imgproxy docs}
+ */
+type AvifOptions =
+  | AvifSubsampleOptions
+  | {
+      /**
+       * Controls when chroma subsampling is used. Default: `"auto"`
+       */
+      subsample: AvifSubsampleOptions;
+    };
+
+/**
+ * *AVIF options option*. **PRO feature**
+ *
+ * To describe the AVIF options option, you can use the keyword `avif_options` or `avifo`.
+ *
+ * @see https://docs.imgproxy.net/generating_the_url?id=avif-options
+ */
+interface AvifOptionsPartial {
+  avif_options?: AvifOptions;
+  avifo?: AvifOptions;
+}
+
+export { AvifOptions, AvifOptionsPartial };
diff --git a/src/types/index.ts b/src/types/index.ts
index a4452369..0ea5ceb2 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -1,6 +1,7 @@
 import type { AdjustOptionsPartial } from "./adjust";
 import type { AutoqualityOptionsPartial } from "./autoquality";
 import type { AutoRotateOptionsPartial } from "./autoRotate";
+import type { AvifOptionsPartial } from "./avifOptions";
 import type { BackgroundOptionsPartial } from "./background";
 import type { BackgroundAlphaOptionsPartial } from "./backgroundAlpha";
 import type { BlurDetectionsOptionsPartial } from "./blurDetections";
@@ -80,6 +81,7 @@ import type { WildOptionsPartial } from "../typesShared/wildOptions";
 export type Options = AdjustOptionsPartial &
   AutoqualityOptionsPartial &
   AutoRotateOptionsPartial &
+  AvifOptionsPartial &
   BackgroundOptionsPartial &
   BackgroundAlphaOptionsPartial &
   BlurDetectionsOptionsPartial &
diff --git a/tests/optionsBasic/avifOptions.test.ts b/tests/optionsBasic/avifOptions.test.ts
new file mode 100644
index 00000000..8162adf4
--- /dev/null
+++ b/tests/optionsBasic/avifOptions.test.ts
@@ -0,0 +1,71 @@
+import { describe, expect, it } from "vitest";
+import { test, build } from "../../src/options/avifOptions";
+
+describe("avifOptions", () => {
+  describe("test", () => {
+    it("should return true if avif_options option is defined", () => {
+      expect(test({ avif_options: "auto" })).toEqual(true);
+    });
+
+    it("should return true if avifo option is defined", () => {
+      expect(test({ avifo: "on" })).toEqual(true);
+    });
+
+    it("should return false if avif_options option is undefined", () => {
+      expect(test({})).toEqual(false);
+    });
+  });
+
+  describe("build", () => {
+    it("should throw an error if avif_options is undefined", () => {
+      expect(() => build({})).toThrow("avif_options option is undefined");
+    });
+
+    it("should throw an error if avif_options is invalid", () => {
+      // @ts-expect-error: Let's ignore an error (check for users with vanilla js).
+      expect(() => build({ avif_options: "invalid" })).toThrow(
+        "avif_options option is invalid. Valid values are: auto, on, off"
+      );
+    });
+
+    it("should throw an error if avif_options is a number", () => {
+      // @ts-expect-error: Let's ignore an error (check for users with vanilla js).
+      expect(() => build({ avif_options: 1 })).toThrow(
+        "avif_options option is invalid. Valid values are: auto, on, off"
+      );
+    });
+
+    it("should return avifo:auto if avif_options is auto", () => {
+      expect(build({ avif_options: "auto" })).toEqual("avifo:auto");
+    });
+
+    it("should return avifo:on if avifo option is on", () => {
+      expect(build({ avifo: "on" })).toEqual("avifo:on");
+    });
+
+    it("should return avifo:off if avif_options is off", () => {
+      expect(build({ avif_options: "off" })).toEqual("avifo:off");
+    });
+
+    it("should support object notation with subsample property", () => {
+      expect(build({ avif_options: { subsample: "auto" } })).toEqual(
+        "avifo:auto"
+      );
+
+      expect(build({ avif_options: { subsample: "on" } })).toEqual("avifo:on");
+
+      expect(build({ avif_options: { subsample: "off" } })).toEqual(
+        "avifo:off"
+      );
+    });
+
+    it("should throw an error if subsample is invalid in object notation", () => {
+      expect(() =>
+        // @ts-expect-error: Let's ignore an error (check for users with vanilla js).
+        build({ avif_options: { subsample: "invalid" } })
+      ).toThrow(
+        "avif_options option is invalid. Valid values are: auto, on, off"
+      );
+    });
+  });
+});