diff --git a/generate.ts b/generate.ts
index 7c6cfa76f3f28da81730d9fb4c88853ab8af269f..a1d43719b56c976ae10281a4fe44369ddfe616a7 100644
--- a/generate.ts
+++ b/generate.ts
@@ -1,4 +1,3 @@
-import { closeSync, openSync } from "node:fs";
 import casesraw from "./urltestdata.json";
 import casesidna from "./IdnaTestV2.json";
 
diff --git a/licenses.txt b/licenses.txt
index 8491ea7d0ea491fdce748d375a5913766588da31..e77a3aad5d54b43c939a4906934f98b746595242 100644
--- a/licenses.txt
+++ b/licenses.txt
@@ -3,12 +3,14 @@ MPL-2.0:
 - This
 - git https://github.com/nektro/zig-net
 - git https://github.com/nektro/zig-nio
+- git https://github.com/nektro/zig-unicode-idna
 
 MIT:
 = https://spdx.org/licenses/MIT
 - git https://github.com/nektro/zig-expect
 - git https://github.com/nektro/zig-extras
 - git https://github.com/nektro/zig-sys-linux
+- git https://github.com/nektro/zig-unicode-ucd
 
 Unspecified:
 - system_lib c
diff --git a/url.zig b/url.zig
index d2fc19ebaca618a78c3072f6248502ec71a9a013..692cccce952f25966c7a0bf146ac8d9e4d4033cd 100644
--- a/url.zig
+++ b/url.zig
@@ -2,6 +2,7 @@ const std = @import("std");
 const builtin = @import("builtin");
 const net = @import("net");
 const extras = @import("extras");
+const unicode_idna = @import("unicode-idna");
 
 pub const URL = struct {
     href: []const u8,
@@ -448,6 +449,7 @@ pub const URL = struct {
                 },
                 .file => {
                     // 1. Set url’s scheme to "file".
+                    scheme.clearRetainingCapacity();
                     try scheme.appendSlice("file");
                     // 2. Set url’s host to the empty string.
                     host = .{ .name = "" };
@@ -1057,9 +1059,11 @@ fn percentDecode(allocator: std.mem.Allocator, input: []const u8) ![]u8 {
 }
 
 /// https://url.spec.whatwg.org/#concept-domain-to-ascii
-// TODO:
 fn domainToAscii(allocator: std.mem.Allocator, domain: []const u8, beStrict: bool) ![]u8 {
-    const result = try allocator.dupe(u8, domain);
+    const result = unicode_idna.ToASCII(allocator, domain, beStrict, true, true, beStrict, false, beStrict, false) catch |err| switch (err) {
+        error.IDNAFailure => return error.InvalidURL,
+        error.OutOfMemory => return error.OutOfMemory,
+    };
     errdefer allocator.free(result);
     if (!beStrict) {
         if (result.len == 0) return error.InvalidURL;
diff --git a/zigmod.yml b/zigmod.yml
index a0af50bbec67400de41bc51f93adeb53dd50455c..1800017b0d80e80e9623718f8d5b2eb8c701ae67 100644
--- a/zigmod.yml
+++ b/zigmod.yml
@@ -6,5 +6,6 @@ description: A WHATWG URL-compatible parser for Zig
 dependencies:
   - src: git https://github.com/nektro/zig-net
   - src: git https://github.com/nektro/zig-extras
+  - src: git https://github.com/nektro/zig-unicode-idna
 root_dependencies:
   - src: git https://github.com/nektro/zig-expect