diff --git a/.gitignore b/.gitignore
index 029a7dc..8bca0f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
-/gdoc2pdf
+/gdoc2pdf*
+/checksums.txt*
 /*.pdf
diff --git a/Makefile b/Makefile
index d7cdb63..a1e24da 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,14 @@
 buildflags := -ldflags "-w -s -X main.Version=$(shell git describe --abbrev=4 --dirty --always --tags)" -tags netgo,osusergo
 gdoc2pdf: *.go
 	go build -o $@ $(buildflags)
+gdoc2pdf.exe: *.go
+	env GOOS=windows GOARCH=amd64 go build $(buildflags) -o $@
+gdoc2pdf-osx: *.go
+	env GOOS=darwin GOARCH=amd64 go build $(buildflags) -o $@
+checksums.txt:
+	sha256sum gdoc2pdf* > checksums.txt
+	gpg --armor --detach-sign checksums.txt
+release: clean gdoc2pdf gdoc2pdf.exe gdoc2pdf-osx checksums.txt
 clean:
-	rm -f gdoc2pdf
+	rm -f gdoc2pdf gdoc2pdf.exe gdoc2pdf-osx checksums.txt checksums.txt.asc
 .PHONY += clean