diff --git a/utils/backdate_vae_keys.py b/utils/backdate_vae_keys.py
new file mode 100644
index 0000000..a23e145
--- /dev/null
+++ b/utils/backdate_vae_keys.py
@@ -0,0 +1,105 @@
+import os
+import torch
+from safetensors.torch import save_file, load_file
+
+def fix_vae_keys(state_dict):
+    new_state_dict = {}
+
+    for key in state_dict.keys():
+        new_key = key
+        if key.startswith("first_stage_model"):
+            if ".to_q" in key:
+                print(f" *  backdating {key}")
+                new_key = new_key.replace('.to_q.', '.q.')
+                print(f" ** new key -> {new_key}\n")
+            elif ".to_k" in key:
+                print(f" *  backdating {key}")
+                new_key = new_key.replace('.to_k.', '.k.')
+                print(f" ** new key -> {new_key}\n")
+            elif ".to_v" in key:
+                print(f" *  backdating {key}")
+                new_key = new_key.replace('.to_v.', '.v.')
+                print(f" ** new key -> {new_key}\n")
+            elif ".to_out.0" in key:
+                print(f" *  backdating {key}")
+                new_key = new_key.replace('.to_out.0', '.proj_out')
+                print(f" ** new key -> {new_key}\n")
+
+        new_state_dict[new_key] = state_dict[key]
+
+    return new_state_dict
+
+
+def _backdate_keys(filepath, state_dict):
+    new_state_dict = fix_vae_keys(state_dict)
+    base_path_without_ext = os.path.splitext(filepath)[0]
+    ext = os.path.splitext(filepath)[1]
+
+    new_path = f"{base_path_without_ext}_fixed{ext}"
+    print (f"Saving to {new_path}")
+    save_file(new_state_dict, new_path)
+
+def _compare_keys(filea_state_dict, fileb_state_dict):
+    #remove cond_stage_model.transformer.text_model.embeddings.position_ids key
+    if 'cond_stage_model.transformer.text_model.embeddings.position_ids' in filea_state_dict:
+        filea_state_dict.pop('cond_stage_model.transformer.text_model.embeddings.position_ids', None)
+    if 'cond_stage_model.transformer.text_model.embeddings.position_ids' in fileb_state_dict:
+        fileb_state_dict.pop('cond_stage_model.transformer.text_model.embeddings.position_ids', None)
+
+    # sort the keys for comparison (best shot we have at a fair comparison without trying to count params and other nonsense)
+    filea_state_dict_keys = sorted(filea_state_dict.keys())
+    fileb_state_dict_keys = sorted(fileb_state_dict.keys())
+
+    print("filea keys         <----->          fileb keys")
+    # compare the keys line by line
+    for filea_key, fileb_key in zip(filea_state_dict_keys, fileb_state_dict_keys):
+        if filea_key != fileb_key:
+            print("Mismatched keys:")
+            print (f"   filea key: {filea_key}")
+            print (f"   fileb key: {fileb_key}")            
+        else:
+            #print (f"{ckpt_key} == {st_key}")
+            pass
+    print("filea keys         <----->          fileb keys")
+
+def _load(filepath):
+    if filepath.endswith(".safetensors"):
+        print(f" Loading {filepath} loading as safetensors file")
+        state_dict = load_file(filepath)
+    else: # LDM ckpt
+        print(f" Loading {filepath} loading as LDM checkpoint")
+        state_dict = torch.load(filepath, map_location='cpu')['state_dict']
+    return state_dict
+
+if __name__ == "__main__":
+    print("BACKDATE AutoencoderKL/VAE KEYS TO OLD NAMES SCRIPT OF DOOM")
+    print("================================")
+    print(" --filea <path to ckpt or safetensors file>    file to backdate the VAE keys (will make a copy as <filename>_fixed.safetensors)")
+    print(" --fileb <path to ckpt or safetensors file>    to compare keys to filea")
+    print(" --compare                                     to run keys comparison (requires both --filea and --fileb)")
+    print(" --backdate                                    to backdate keys (only for --filea)")
+    print(" You must specify either --compare or --backdate to do anything")
+    print(" ex.   python utils/backdate_vae_keys.py --filea my_finetune.safetensors --fileb original_sd15.ckpt --compare")
+    print(" ex.   python utils/backdate_vae_keys.py --filea my_finetune.safetensors --backdate")
+
+    import argparse
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--filea", type=str, required=True, help="Path to the safetensors file to fix")
+    parser.add_argument("--fileb", type=str, required=False, help="Path to the safetensors file to fix")
+    parser.add_argument("--compare", action="store_true", help="Compare keys")
+    parser.add_argument("--backdate", action="store_true", help="backdates the keys in filea only")
+    args = parser.parse_args()
+
+    filea_state_dict = _load(args.filea) if args.filea else None
+    fileb_state_dict = _load(args.fileb) if args.fileb else None
+
+    if args.compare and not args.backdate:
+        print(f"Comparing keys in {args.filea} to {args.fileb}")
+        _compare_keys(filea_state_dict, fileb_state_dict)
+    elif args.backdate:
+        print(f"Backdating keys in {args.filea}")
+        print(f"   ** ignoring {args.fileb}") if args.fileb else None
+        _backdate_keys(args.filea, filea_state_dict)
+    else:
+        print("Please specify only --compare with both --filea and --fileb to compare keys and print differences to console")
+        print(" ... or --backdate with only --filea to backdate its keys to old LDM names and save to <filea>_fixed.safetensors")