diff --git a/include/ircd/base.h b/include/ircd/base.h
index f3487272d..a6013774b 100644
--- a/include/ircd/base.h
+++ b/include/ircd/base.h
@@ -43,10 +43,12 @@ namespace ircd
 	const_buffer b64decode(const mutable_buffer &out, const string_view &in);
 	std::string b64decode(const string_view &in);
 
-	// Base64 <-> Base58 convenience conversions
+	// Base64 convenience conversions
 	string_view b64tob58(const mutable_buffer &out, const string_view &in);
 	string_view b58tob64(const mutable_buffer &out, const string_view &in);
 	string_view b58tob64_unpadded(const mutable_buffer &out, const string_view &in);
+	string_view b64tob64url(const mutable_buffer &out, const string_view &in);
+	string_view b64urltob64(const mutable_buffer &out, const string_view &in);
 }
 
 inline size_t
diff --git a/ircd/base.cc b/ircd/base.cc
index abc72fcda..4f7da8ceb 100644
--- a/ircd/base.cc
+++ b/ircd/base.cc
@@ -12,6 +12,28 @@
 #include <boost/archive/iterators/binary_from_base64.hpp>
 #include <boost/archive/iterators/transform_width.hpp>
 
+ircd::string_view
+ircd::b64urltob64(const mutable_buffer &out,
+                  const string_view &in)
+{
+	//TODO: optimize with single pass
+	string_view ret(in);
+	ret = replace(out, ret, '-', '+');
+	ret = replace(out, ret, '_', '/');
+	return ret;
+}
+
+ircd::string_view
+ircd::b64tob64url(const mutable_buffer &out,
+                  const string_view &in)
+{
+	//TODO: optimize with single pass
+	string_view ret(in);
+	ret = replace(out, ret, '+', '-');
+	ret = replace(out, ret, '/', '_');
+	return ret;
+}
+
 ircd::string_view
 ircd::b58tob64_unpadded(const mutable_buffer &out,
                         const string_view &in)