diff --git a/src/preprocess.js b/src/preprocess.js
index 8945cf6..610415f 100755
--- a/src/preprocess.js
+++ b/src/preprocess.js
@@ -55,6 +55,8 @@ let config = {
 	reverseTags: false, // inverts sorting, prioritizing tags with little representation in the model
 
 	tagDelimiter: ",", // what separates each tag in the filename, web UI will accept comma separated filenames
+
+	invalidCharacters: "\\/:*?\"<>|", // characters that can't go in a filename
 }
 
 // import source
@@ -162,21 +164,27 @@ let parse = async () => {
 						config.tags[tag] = (config.tagsOverrideStart--) * scale;
 					}
 				} else if ( !config.tags[tag] ) continue;
-				if ( tag.indexOf("/") >= 0 ) continue; // illegal filename character
+
+				let filtered = false;
+				for ( let i in config.invalidCharacters ) {
+					if ( tag.indexOf(config.invalidCharacters[i]) >= 0 ) {
+						filtered = true;
+						break;
+					}
+				}
 
 				if ( config.filter ) {
-					let should = false;
 					for ( let i in config.filters ) {
 						let filter = config.filters[i];
 						if ( filter === tag || ( filter instanceof RegExp && tag.match(filter) ) ) {
-							should = true;
+							filtered = true;
 							break;
 						}
 					}
-					if ( should ) continue;
+					if ( filtered ) continue;
 				}
 				
-				tags.push(tag);
+				if ( !filtered ) tags.push(tag);
 			}
 		}
 		tags = tags.sort( (a, b) => {
diff --git a/src/preprocess.py b/src/preprocess.py
index b06657f..9b5aa8a 100755
--- a/src/preprocess.py
+++ b/src/preprocess.py
@@ -17,7 +17,7 @@ config = {
 	'cache': './data/cache.json', # JSON file of cached tags, will speed up processing if re-running
 
 	'rateLimit': 500, # time to wait between requests, in milliseconds, e621 imposes a rate limit of 2 requests per second
-	'filenameLimit': 245, # maximum characters to put in the filename, necessary to abide by filesystem limitations
+	'filenameLimit': 240, # maximum characters to put in the filename, necessary to abide by filesystem limitations
 	# you can set this to 245, as the web UI has uncapped the prompt limit, but I have yet to test this if this limit was also lifted for textual inversion
 
 	'filter': True,
@@ -60,6 +60,8 @@ config = {
 	'reverseTags': False, # inverts sorting, prioritizing tags with little representation in the model
 
 	'tagDelimiter': ",", # what separates each tag in the filename, web UI will accept comma separated filenames
+
+	'invalidCharacters': "\\/:*?\"<>|", # characters that can't go in a filename
 }
 
 if os.path.exists(config['source']):
@@ -155,21 +157,25 @@ def parse():
 							config['tagsOverrideStart'] = config['tagsOverrideStart'] - 1
 					elif tag not in config['tags']:
 						continue
-					if "/" in tag or ":" in tag:
-						continue # illegal filename character
+					
+					filtered = False
+					for char in config['invalidCharacters']: # illegal filename character
+						if char in tag:
+							filtered = True
+							break
 
 					if config['filter']:
-						should = False
 						if tag in config['filters']:
 							continue # was break in the original script, fixed ;)
 						for filter in config['filtersRegex']:
 							if re.search(filter, tag):
-								should = True
+								filtered = True
 								break
-						if should:
+						if filtered:
 							continue
 
-					tags.append(tag)
+					if not filtered:
+						tags.append(tag)
 		tags.sort(key=lambda x: -config['tags'][x], reverse=config['reverseTags'])
 		if artist:
 			tags.insert(0, artist)