diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 422a604..cf6be5b 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -117,24 +117,36 @@ jobs:
         include:
           - triple: x86_64-unknown-linux-gnu
             os: ubuntu-latest
+            features: --all-features
           - triple: aarch64-unknown-linux-gnu
             os: ubuntu-latest
+            features: --all-features
           - triple: armv7-unknown-linux-gnueabihf
             os: ubuntu-latest
+            features: --all-features
           - triple: arm-unknown-linux-gnueabihf
             os: ubuntu-latest
+            features: --all-features
           - triple: riscv64gc-unknown-linux-gnu
             os: ubuntu-latest
+            features: --all-features
+          - triple: wasm32-unknown-unknown
+            os: ubuntu-latest
+            features: --no-default-features --features=async-http-client
 
           - triple: x86_64-apple-darwin
             os: macos-latest
+            features: --all-features
           - triple: aarch64-apple-darwin
             os: macos-latest
+            features: --all-features
 
           - triple: x86_64-pc-windows-msvc
             os: windows-latest
+            features: --all-features
           - triple: aarch64-pc-windows-msvc
             os: windows-latest
+            features: --all-features
     env:
       RUSTFLAGS: --deny warnings
     steps:
@@ -156,4 +168,4 @@ jobs:
           key: release-${{ matrix.triple }}-${{ steps.rust.outputs.cachekey }}-${{ hashFiles('**/Cargo.*') }}
           path: target/
 
-      - run: ${{ runner.os == 'Linux' && 'cross' || 'cargo' }} build --release --offline --all-features --target ${{ matrix.triple }}
+      - run: ${{ runner.os == 'Linux' && 'cross' || 'cargo' }} build --release --offline ${{ matrix.features }} --target ${{ matrix.triple }}
diff --git a/Cargo.toml b/Cargo.toml
index e88e5b7..aae2ec8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -101,7 +101,7 @@ default-features = false
 features = ["multipart", "stream", "rustls-tls"]
 optional = true
 
-[dependencies.tokio]
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies.tokio]
 version = "1"
 features = ["fs"]
 optional = true
diff --git a/src/client_reqwest.rs b/src/client_reqwest.rs
index 375359f..98d9f66 100644
--- a/src/client_reqwest.rs
+++ b/src/client_reqwest.rs
@@ -1,11 +1,9 @@
 use std::path::PathBuf;
-use std::time::Duration;
 
 use async_trait::async_trait;
 use bon::Builder;
 use reqwest::multipart;
 use serde_json::Value;
-use tokio::fs::File;
 
 use crate::trait_async::AsyncTelegramApi;
 use crate::Error;
@@ -17,16 +15,21 @@ pub struct AsyncApi {
     #[builder(into)]
     pub api_url: String,
 
-    #[builder(
-        default = reqwest::ClientBuilder::new()
-            .connect_timeout(Duration::from_secs(10))
-            .timeout(Duration::from_secs(500))
-            .build()
-            .unwrap()
-    )]
+    #[builder(default = default_client())]
     pub client: reqwest::Client,
 }
 
+fn default_client() -> reqwest::Client {
+    let client_builder = reqwest::ClientBuilder::new();
+
+    #[cfg(not(target_arch = "wasm32"))]
+    let client_builder = client_builder
+        .connect_timeout(std::time::Duration::from_secs(10))
+        .timeout(std::time::Duration::from_secs(500));
+
+    client_builder.build().unwrap()
+}
+
 impl AsyncApi {
     /// Create a new `AsyncApi`. You can use [`AsyncApi::new_url`] or [`AsyncApi::builder`] for more options.
     pub fn new(api_key: &str) -> Self {
@@ -66,7 +69,9 @@ impl From<reqwest::Error> for Error {
     }
 }
 
-#[async_trait]
+// Wasm target need not be `Send` because it is single-threaded
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
 impl AsyncTelegramApi for AsyncApi {
     type Error = Error;
 
@@ -128,8 +133,9 @@ impl AsyncTelegramApi for AsyncApi {
             }
         }
 
+        #[cfg(not(target_arch = "wasm32"))] // TODO: just for demonstration
         for (parameter_name, file_path, file_name) in files_with_paths {
-            let file = File::open(file_path)
+            let file = tokio::fs::File::open(file_path)
                 .await
                 .map_err(|error| Error::Encode(error.to_string()))?;
             let part = multipart::Part::stream(file).file_name(file_name);
diff --git a/src/trait_async.rs b/src/trait_async.rs
index cf550fa..c1a0fa4 100644
--- a/src/trait_async.rs
+++ b/src/trait_async.rs
@@ -48,7 +48,9 @@ macro_rules! request_nb {
     }
 }
 
-#[async_trait::async_trait]
+// Wasm target need not be `Send` because it is single-threaded
+#[cfg_attr(target_arch = "wasm32", async_trait::async_trait(?Send))]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait::async_trait)]
 pub trait AsyncTelegramApi
 where
     Self: Sync,