diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cc08078..b01c2b6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -63,6 +63,7 @@ jobs:
           - "feat.: gzip"
           - "feat.: brotli"
           - "feat.: json"
+          - "feat.: multipart"
           - "feat.: stream"
           - "feat.: socks/default-tls"
           - "feat.: socks/rustls-tls"
@@ -84,21 +85,21 @@ jobs:
           - name: windows / stable-x86_64-msvc
             os: windows-latest
             target: x86_64-pc-windows-msvc
-            features: "--features blocking,gzip,brotli,json"
+            features: "--features blocking,gzip,brotli,json,multipart"
           - name: windows / stable-i686-msvc
             os: windows-latest
             target: i686-pc-windows-msvc
-            features: "--features blocking,gzip,brotli,json"
+            features: "--features blocking,gzip,brotli,json,multipart"
           - name: windows / stable-x86_64-gnu
             os: windows-latest
             rust: stable-x86_64-pc-windows-gnu
             target: x86_64-pc-windows-gnu
-            features: "--features blocking,gzip,brotli,json"
+            features: "--features blocking,gzip,brotli,json,multipart"
           - name: windows / stable-i686-gnu
             os: windows-latest
             rust: stable-i686-pc-windows-gnu
             target: i686-pc-windows-gnu
-            features: "--features blocking,gzip,brotli,json"
+            features: "--features blocking,gzip,brotli,json,multipart"
 
           - name: "feat.: default-tls disabled"
             features: "--no-default-features"
@@ -120,6 +121,8 @@ jobs:
             features: "--features brotli"
           - name: "feat.: json"
             features: "--features json"
+          - name: "feat.: multipart"
+            features: "--features multipart"
           - name: "feat.: stream"
             features: "--features stream"
           - name: "feat.: socks/default-tls"
diff --git a/Cargo.toml b/Cargo.toml
index 5bc1686..808206d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,7 @@ features = [
     "blocking",
     "cookies",
     "json",
+    "multipart",
 ]
 
 [features]
@@ -49,6 +50,8 @@ brotli = ["async-compression", "async-compression/brotli", "tokio-util"]
 
 json = ["serde_json"]
 
+multipart = ["mime_guess"]
+
 trust-dns = ["trust-dns-resolver"]
 
 stream = []
@@ -74,9 +77,13 @@ url = "2.2"
 bytes = "1.0"
 serde = "1.0"
 serde_urlencoded = "0.7"
-mime_guess = "2.0"
+
+# Optional deps...
+
 ## json
 serde_json = { version = "1.0", optional = true }
+## multipart
+mime_guess = { version = "2.0", default-features = false, optional = true }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 base64 = "0.13"
@@ -206,3 +213,8 @@ required-features = ["gzip"]
 name = "brotli"
 path = "tests/brotli.rs"
 required-features = ["brotli"]
+
+[[test]]
+name = "multipart"
+path = "tests/multipart.rs"
+required-features = ["multipart"]
diff --git a/src/async_impl/body.rs b/src/async_impl/body.rs
index 2c16166..5d12d05 100644
--- a/src/async_impl/body.rs
+++ b/src/async_impl/body.rs
@@ -152,6 +152,7 @@ impl Body {
         ImplStream(self)
     }
 
+    #[cfg(feature = "multipart")]
     pub(crate) fn content_length(&self) -> Option<u64> {
         match self.inner {
             Inner::Reusable(ref bytes) => Some(bytes.len() as u64),
diff --git a/src/async_impl/mod.rs b/src/async_impl/mod.rs
index 15e6ce2..1be0b66 100644
--- a/src/async_impl/mod.rs
+++ b/src/async_impl/mod.rs
@@ -9,6 +9,7 @@ pub(crate) use self::decoder::Decoder;
 pub mod body;
 pub mod client;
 pub mod decoder;
+#[cfg(feature = "multipart")]
 pub mod multipart;
 pub(crate) mod request;
 mod response;
diff --git a/src/async_impl/request.rs b/src/async_impl/request.rs
index fa2f405..fdb542b 100644
--- a/src/async_impl/request.rs
+++ b/src/async_impl/request.rs
@@ -11,9 +11,12 @@ use serde_json;
 
 use super::body::Body;
 use super::client::{Client, Pending};
+#[cfg(feature = "multipart")]
 use super::multipart;
 use super::response::Response;
-use crate::header::{HeaderMap, HeaderName, HeaderValue, CONTENT_LENGTH, CONTENT_TYPE};
+use crate::header::{HeaderMap, HeaderName, HeaderValue, CONTENT_TYPE};
+#[cfg(feature = "multipart")]
+use crate::header::CONTENT_LENGTH;
 use crate::{Method, Url};
 use http::{Request as HttpRequest, request::Parts};
 
@@ -260,6 +263,7 @@ impl RequestBuilder {
     /// # Ok(())
     /// # }
     /// ```
+    #[cfg(feature = "multipart")]
     pub fn multipart(self, mut multipart: multipart::Form) -> RequestBuilder {
         let mut builder = self.header(
             CONTENT_TYPE,
diff --git a/src/blocking/body.rs b/src/blocking/body.rs
index c42e418..a3c3d62 100644
--- a/src/blocking/body.rs
+++ b/src/blocking/body.rs
@@ -1,7 +1,9 @@
 use std::fmt;
 use std::fs::File;
 use std::future::Future;
-use std::io::{self, Cursor, Read};
+use std::io::{self, Read};
+#[cfg(feature = "multipart")]
+use std::io::Cursor;
 use std::mem;
 use std::ptr;
 
@@ -113,6 +115,7 @@ impl Body {
         }
     }
 
+    #[cfg(feature = "multipart")]
     pub(crate) fn len(&self) -> Option<u64> {
         match self.kind {
             Kind::Reader(_, len) => len,
@@ -120,6 +123,7 @@ impl Body {
         }
     }
 
+    #[cfg(feature = "multipart")]
     pub(crate) fn into_reader(self) -> Reader {
         match self.kind {
             Kind::Reader(r, _) => Reader::Reader(r),
@@ -236,11 +240,13 @@ impl<'a> fmt::Debug for DebugLength<'a> {
     }
 }
 
+#[cfg(feature = "multipart")]
 pub(crate) enum Reader {
     Reader(Box<dyn Read + Send>),
     Bytes(Cursor<Bytes>),
 }
 
+#[cfg(feature = "multipart")]
 impl Read for Reader {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         match *self {
diff --git a/src/blocking/mod.rs b/src/blocking/mod.rs
index 4948cfb..550716d 100644
--- a/src/blocking/mod.rs
+++ b/src/blocking/mod.rs
@@ -59,6 +59,7 @@
 
 mod body;
 mod client;
+#[cfg(feature = "multipart")]
 pub mod multipart;
 mod request;
 mod response;
diff --git a/src/blocking/request.rs b/src/blocking/request.rs
index 4c74cf1..72a1426 100644
--- a/src/blocking/request.rs
+++ b/src/blocking/request.rs
@@ -10,6 +10,7 @@ use serde_json;
 use serde_urlencoded;
 
 use super::body::{self, Body};
+#[cfg(feature = "multipart")]
 use super::multipart;
 use super::Client;
 use crate::header::{HeaderMap, HeaderName, HeaderValue, CONTENT_TYPE};
@@ -508,6 +509,7 @@ impl RequestBuilder {
     /// ```
     ///
     /// See [`multipart`](multipart/) for more examples.
+    #[cfg(feature = "multipart")]
     pub fn multipart(self, mut multipart: multipart::Form) -> RequestBuilder {
         let mut builder = self.header(
             CONTENT_TYPE,
diff --git a/src/lib.rs b/src/lib.rs
index 2b59a3e..3fff272 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -182,6 +182,7 @@
 //! - **gzip**: Provides response body gzip decompression.
 //! - **brotli**: Provides response body brotli decompression.
 //! - **json**: Provides serialization and deserialization for JSON bodies.
+//! - **multipart**: Provides functionality for multipart forms.
 //! - **stream**: Adds support for `futures::Stream`.
 //! - **socks**: Provides SOCKS5 proxy support.
 //! - **trust-dns**: Enables a trust-dns async resolver instead of default
@@ -290,11 +291,13 @@ if_hyper! {
     doctest!("../README.md");
 
     pub use self::async_impl::{
-        multipart, Body, Client, ClientBuilder, Request, RequestBuilder, Response, ResponseBuilderExt,
+        Body, Client, ClientBuilder, Request, RequestBuilder, Response, ResponseBuilderExt,
     };
     pub use self::proxy::Proxy;
     #[cfg(feature = "__tls")]
     pub use self::tls::{Certificate, Identity};
+    #[cfg(feature = "multipart")]
+    pub use self::async_impl::multipart;
 
 
     mod async_impl;
@@ -316,5 +319,7 @@ if_wasm! {
     mod wasm;
     mod util;
 
-    pub use self::wasm::{multipart, Body, Client, ClientBuilder, Request, RequestBuilder, Response};
+    pub use self::wasm::{Body, Client, ClientBuilder, Request, RequestBuilder, Response};
+    #[cfg(feature = "multipart")]
+    pub use self::wasm::multipart;
 }
diff --git a/src/wasm/body.rs b/src/wasm/body.rs
index ab2160f..ebcf180 100644
--- a/src/wasm/body.rs
+++ b/src/wasm/body.rs
@@ -1,3 +1,4 @@
+#[cfg(feature = "multipart")]
 use super::multipart::Form;
 /// dox
 use bytes::Bytes;
@@ -18,6 +19,7 @@ pub struct Body {
 
 enum Inner {
     Bytes(Bytes),
+    #[cfg(feature = "multipart")]
     Multipart(Form),
 }
 
@@ -30,6 +32,7 @@ impl Body {
                 let js_value: &JsValue = body_array.as_ref();
                 Ok(js_value.to_owned())
             }
+            #[cfg(feature = "multipart")]
             Inner::Multipart(form) => {
                 let form_data = form.to_form_data()?;
                 let js_value: &JsValue = form_data.as_ref();
@@ -39,6 +42,7 @@ impl Body {
     }
 
     #[inline]
+    #[cfg(feature = "multipart")]
     pub(crate) fn from_form(f: Form) -> Body {
         Self {
             inner: Inner::Multipart(f),
@@ -48,6 +52,7 @@ impl Body {
     pub(crate) fn is_empty(&self) -> bool {
         match &self.inner {
             Inner::Bytes(bytes) => bytes.is_empty(),
+            #[cfg(feature = "multipart")]
             Inner::Multipart(form) => form.is_empty(),
         }
     }
diff --git a/src/wasm/mod.rs b/src/wasm/mod.rs
index b0107d3..a0ba070 100644
--- a/src/wasm/mod.rs
+++ b/src/wasm/mod.rs
@@ -5,6 +5,7 @@ mod client;
 mod request;
 mod response;
 /// TODO
+#[cfg(feature = "multipart")]
 pub mod multipart;
 
 pub use self::body::Body;
diff --git a/src/wasm/request.rs b/src/wasm/request.rs
index df78083..b7c7990 100644
--- a/src/wasm/request.rs
+++ b/src/wasm/request.rs
@@ -191,6 +191,7 @@ impl RequestBuilder {
     }
 
     /// TODO
+    #[cfg(feature = "multipart")]
     pub fn multipart(mut self, multipart: super::multipart::Form) -> RequestBuilder {
         if let Ok(ref mut req) = self.request {
             *req.body_mut() = Some(Body::from_form(multipart))