diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..bfcaa5e
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,41 @@
+name: Build CI
+
+on:
+    push:
+    pull_request:
+    release:
+        types: [published]
+    check_suite:
+        types: [rerequested]
+
+jobs:
+    test:
+        runs-on: ubuntu-18.04
+        container: debian:buster
+
+        steps:
+            - name: install dependencies
+              run: |
+                apt-get update
+                apt-get --no-install-recommends -y install build-essential git
+
+            - name: checkout
+              uses: actions/checkout@v2
+
+            - name: build
+              run: |
+                docker run --rm -v $(pwd):/src -u $(id -u):$(id -g) emscripten/emsdk ./build.sh
+
+            - if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+              name: publish
+              run: |
+                git branch -D gh-pages || true
+                python3 import.py | git fast-import --date-format=now
+                git config user.email "jepler@gmail.com"
+                git config user.name "Jeff Epler (github actions)"
+                git remote set-url --push origin https://jepler:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}
+
+            - uses: actions/upload-artifact@v2
+              with:
+                name: Web pages
+                path: output/
diff --git a/.gitignore b/.gitignore
index 54461f5..1f57b97 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1 @@
-/index.html
-/index.js
-/index.was*
+/output
diff --git a/build.sh b/build.sh
index a2ac83c..d6efe9a 100755
--- a/build.sh
+++ b/build.sh
@@ -1,2 +1,4 @@
 #!/bin/sh
-EMCC_DEBUG=1 emcc -g4 -Wall -Werror -s SAFE_HEAP=1 -s STACK_OVERFLOW_CHECK=1 -s ASSERTIONS=2 -DASSERTIONS=2 -s FORCE_FILESYSTEM=1 -s EXPORTED_RUNTIME_METHODS="['ccall']" -DPACKAGE_STRING=\"bdftopcf\" -I . *.c -o index.html --shell-file shell.html
+mkdir output
+
+emcc -Wall -Werror -s SAFE_HEAP=1 -s STACK_OVERFLOW_CHECK=1 -s ASSERTIONS=2 -s FORCE_FILESYSTEM=1 -s EXPORTED_RUNTIME_METHODS="['ccall']" -DPACKAGE_STRING=\"bdftopcf\" -I . *.c -o output/index.html --shell-file shell.html
diff --git a/import.py b/import.py
new file mode 100755
index 0000000..09ecb73
--- /dev/null
+++ b/import.py
@@ -0,0 +1,30 @@
+#!/usr/bin/python3
+import argparse
+import glob
+import os
+import subprocess
+import sys
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument("branch", default="gh-pages", nargs="?")
+args = parser.parse_args()
+
+version = subprocess.getoutput("git describe --always")
+
+fd = os.fdopen(sys.stdout.fileno(), 'wb')
+
+fd.write(b"commit refs/heads/" + args.branch.encode('utf-8') + b"\n")
+fd.write(b"committer Doc Man <noreply@example.com> now" + b"\n")
+fd.write(b"data <<EOF" + b"\n")
+fd.write(b"Docs built at " + version.encode('utf-8') + b"\n")
+fd.write(b"EOF" + b"\n")
+
+files = glob.glob("doc/*")
+for fn in files:
+    with open(fn, 'rb') as f: contents = f.read()
+    fd.write(b"M 644 inline " + os.path.basename(fn).encode('utf-8') + b"\n")
+    fd.write(b"data " + str(len(contents)).encode("utf-8") + b"\n")
+    fd.write(contents)
+fd.write(b"done\n")
+