diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 30250248..694f6806 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -50,6 +50,16 @@ jobs:
             --target=integration_test/webcrypto_test.dart \
             -d chrome
       - run: xvfb-run flutter pub run test -p vm,chrome,firefox
+      # Test with coverage collection as a separate step.
+      # This will run in debug mode, so we test both with and without coverage.
+      - run: xvfb-run flutter pub run test -p vm,chrome,firefox --coverage ./coverage
+      # Report collected coverage
+      - name: Convert coverage to lcov
+        run: dart run coverage:format_coverage -i ./coverage -o ./coverage/lcov.info --lcov --report-on lib/
+      - uses: coverallsapp/github-action@v2
+          with:
+            flag-name: linux
+            parallel: true
   macos-14:
     name: webcrypto on macOS 14 desktop / Chrome
     runs-on: macos-14 # Test with xcode 15
@@ -141,6 +151,16 @@ jobs:
             --target=integration_test/webcrypto_test.dart \
             -d chrome
       - run: flutter pub run test -p vm,chrome,firefox
+      # Test with coverage collection as a separate step.
+      # This will run in debug mode, so we test both with and without coverage.
+      - run: xvfb-run flutter pub run test -p vm,chrome,firefox --coverage ./coverage
+      # Report collected coverage
+      - name: Convert coverage to lcov
+        run: dart run coverage:format_coverage -i ./coverage -o ./coverage/lcov.info --lcov --report-on lib/
+      - uses: coverallsapp/github-action@v2
+          with:
+            flag-name: windows
+            parallel: true
   ios:
     name: webcrypto on iOS emulator (iPhone)
     runs-on: macos-14
@@ -187,3 +207,13 @@ jobs:
           api-level: 28
           working-directory: ./example
           script: flutter test integration_test/webcrypto_test.dart -d android
+  coverage:
+    name: Report to coveralls
+    runs-on: ubuntu-latest
+    needs:
+      - linux
+      - windows
+    steps:
+      - uses: coverallsapp/github-action@v2
+        with:
+          parallel-finished: true
diff --git a/README.md b/README.md
index c349615f..373d7fde 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,8 @@ Future<void> main() async {
 }
 ```
 
+[![Coverage Status](https://coveralls.io/repos/github/google/webcrypto.dart/badge.svg?branch=master)](https://coveralls.io/github/google/webcrypto.dart?branch=master)
+
 **Features:**
  * Get random bytes
  * Digest (sha-1/sha-256/sha-384/sha-512)
diff --git a/pubspec.yaml b/pubspec.yaml
index f093e354..f7d6a395 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -38,6 +38,7 @@ dev_dependencies:
   flutter_lints: ^4.0.0
   flutter_test:
     sdk: flutter
+  coverage: any # we only need format_coverage, don't care what version
 
 flutter:
   plugin: