diff --git a/convert_hf_to_gguf.py b/convert_hf_to_gguf.py
index a34dabe23..4f79bf775 100755
--- a/convert_hf_to_gguf.py
+++ b/convert_hf_to_gguf.py
@@ -357,6 +357,10 @@ class Model:
                         data_qtype = gguf.GGMLQuantizationType.TQ1_0
                     elif self.ftype == gguf.LlamaFileType.MOSTLY_TQ2_0:
                         data_qtype = gguf.GGMLQuantizationType.TQ2_0
+                    elif self.ftype == gguf.LlamaFileType.MOSTLY_Q4_0:
+                        data_qtype = gguf.GGMLQuantizationType.Q4_0
+                    elif self.ftype == gguf.LlamaFileType.MOSTLY_Q4_1:
+                        data_qtype = gguf.GGMLQuantizationType.Q4_1
                     else:
                         raise ValueError(f"Unknown file type: {self.ftype.name}")
 
@@ -4296,8 +4300,8 @@ def parse_args() -> argparse.Namespace:
         help="path to write to; default: based on input. {ftype} will be replaced by the outtype.",
     )
     parser.add_argument(
-        "--outtype", type=str, choices=["f32", "f16", "bf16", "q8_0", "tq1_0", "tq2_0", "auto"], default="f16",
-        help="output format - use f32 for float32, f16 for float16, bf16 for bfloat16, q8_0 for Q8_0, tq1_0 or tq2_0 for ternary, and auto for the highest-fidelity 16-bit float type depending on the first loaded tensor type",
+        "--outtype", type=str, choices=["f32", "f16", "bf16", "q4_0", "q4_1", "q8_0", "tq1_0", "tq2_0", "auto"], default="f16",
+        help="output format - use f32 for float32, f16 for float16, bf16 for bfloat16, q4_0, q4_1 , q8_0 for Q8_0, tq1_0 or tq2_0 for ternary, and auto for the highest-fidelity 16-bit float type depending on the first loaded tensor type",
     )
     parser.add_argument(
         "--bigendian", action="store_true",
@@ -4383,6 +4387,8 @@ def main() -> None:
         "f32": gguf.LlamaFileType.ALL_F32,
         "f16": gguf.LlamaFileType.MOSTLY_F16,
         "bf16": gguf.LlamaFileType.MOSTLY_BF16,
+        "q4_0": gguf.LlamaFileType.MOSTLY_Q4_0,
+        "q4_1": gguf.LlamaFileType.MOSTLY_Q4_1,
         "q8_0": gguf.LlamaFileType.MOSTLY_Q8_0,
         "tq1_0": gguf.LlamaFileType.MOSTLY_TQ1_0,
         "tq2_0": gguf.LlamaFileType.MOSTLY_TQ2_0,