diff --git a/misc/gff2bed.js b/misc/gff2bed.js
new file mode 100644
index 0000000..7aad052
--- /dev/null
+++ b/misc/gff2bed.js
@@ -0,0 +1,110 @@
+var getopt = function(args, ostr) {
+	var oli; // option letter list index
+	if (typeof(getopt.place) == 'undefined')
+		getopt.ind = 0, getopt.arg = null, getopt.place = -1;
+	if (getopt.place == -1) { // update scanning pointer
+		if (getopt.ind >= args.length || args[getopt.ind].charAt(getopt.place = 0) != '-') {
+			getopt.place = -1;
+			return null;
+		}
+		if (getopt.place + 1 < args[getopt.ind].length && args[getopt.ind].charAt(++getopt.place) == '-') { // found "--"
+			++getopt.ind;
+			getopt.place = -1;
+			return null;
+		}
+	}
+	var optopt = args[getopt.ind].charAt(getopt.place++); // character checked for validity
+	if (optopt == ':' || (oli = ostr.indexOf(optopt)) < 0) {
+		if (optopt == '-') return null; //  if the user didn't specify '-' as an option, assume it means null.
+		if (getopt.place < 0) ++getopt.ind;
+		return '?';
+	}
+	if (oli+1 >= ostr.length || ostr.charAt(++oli) != ':') { // don't need argument
+		getopt.arg = null;
+		if (getopt.place < 0 || getopt.place >= args[getopt.ind].length) ++getopt.ind, getopt.place = -1;
+	} else { // need an argument
+		if (getopt.place >= 0 && getopt.place < args[getopt.ind].length)
+			getopt.arg = args[getopt.ind].substr(getopt.place);
+		else if (args.length <= ++getopt.ind) { // no arg
+			getopt.place = -1;
+			if (ostr.length > 0 && ostr.charAt(0) == ':') return ':';
+			return '?';
+		} else getopt.arg = args[getopt.ind]; // white space
+		getopt.place = -1;
+		++getopt.ind;
+	}
+	return optopt;
+}
+
+var c;
+while ((c = getopt(arguments, "")) != null) {
+}
+
+if (getopt.ind == arguments.length) {
+	print("Usage: k8 gff2bed.js <in.gff>");
+	exit(1);
+}
+
+function print_bed12(exons, cds_st, cds_en)
+{
+	if (exons.length == 0) return;
+	var name = exons[0].slice(4, 7).join("|");
+	var a = exons.sort(function(a,b) {return a[1]-b[1]});
+	var sizes = [], starts = [], st, en;
+	st = a[0][1];
+	en = a[a.length - 1][2];
+	if (cds_st == 1<<30) cds_st = st;
+	if (cds_en == 0) cds_en = en;
+	if (cds_st < st || cds_en > en)
+		throw Error("inconsistent thick start or end for transcript " + a[0][4]);
+	for (var i = 0; i < a.length; ++i) {
+		sizes.push(a[i][2] - a[i][1]);
+		starts.push(a[i][1]);
+	}
+	print(a[0][0], st, en, name, 0, a[0][3], cds_st, cds_en, ".", a.length, sizes.join(",") + ",", starts.join(",") + ",");
+}
+
+var re_gtf = /(transcript_id|transcript_type|transcript_biotype|gene_name) "([^"]+)";/g;
+var re_gff3 = /(transcript_id|transcript_type|transcript_biotype|gene_name)=([^;]+)/g;
+var buf = new Bytes();
+var file = new File(arguments[getopt.ind]);
+
+var exons = [], cds_st = 1<<30, cds_en = 0, last_id = null;
+while (file.readline(buf) >= 0) {
+	var t = buf.toString().split("\t");
+	if (t[0].charAt(0) == '#') continue;
+	if (t[2] != "CDS" && t[2] != "exon") continue;
+	t[3] = parseInt(t[3]) - 1;
+	t[4] = parseInt(t[4]);
+	var id = null, type = "", gname = "N/A", biotype = "", m;
+	while ((m = re_gtf.exec(t[8])) != null) {
+		if (m[1] == "transcript_id") id = m[2];
+		else if (m[1] == "transcript_type") type = m[2];
+		else if (m[1] == "transcript_biotype") biotype = m[2];
+		else if (m[1] == "gene_name") name = m[2];
+	}
+	while ((m = re_gff3.exec(t[8])) != null) {
+		if (m[1] == "transcript_id") id = m[2];
+		else if (m[1] == "transcript_type") type = m[2];
+		else if (m[1] == "transcript_biotype") biotype = m[2];
+		else if (m[1] == "gene_name") name = m[2];
+	}
+	if (type == "" && biotype != "") type = biotype;
+	if (id == null) throw Error("No transcript_id");
+	if (id != last_id) {
+		print_bed12(exons, cds_st, cds_en);
+		exons = [], cds_st = 1<<30, cds_en = 0;
+		last_id = id;
+	}
+	if (t[2] == "CDS") {
+		cds_st = cds_st < t[3]? cds_st : t[3];
+		cds_en = cds_en > t[4]? cds_en : t[4];
+	} else if (t[2] == "exon") {
+		exons.push([t[0], t[3], t[4], t[6], id, type, name]);
+	}
+}
+if (last_id != null)
+	print_bed12(exons, cds_st, cds_en);
+
+file.close();
+buf.destroy();