diff --git a/README.md b/README.md
index e8f62b68..382421f7 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ ngx-translate-extract [options]
 Output
   --format, -f                Format    [string] [choices: "json", "namespaced-json", "pot"] [default: "json"]
   --format-indentation, --fi  Format indentation (JSON/Namedspaced JSON)                [string] [default: "	"]
-  --sort, -s                  Sort strings in alphabetical order                                     [boolean]
+  --sort, -s                  Sort strings in alphabetical order    [string] [choices: "", "case-insensitive"]
   --clean, -c                 Remove obsolete strings after merge                                    [boolean]
   --replace, -r               Replace the contents of output file if it exists (Merges by default)   [boolean]
 
diff --git a/src/cli/cli.ts b/src/cli/cli.ts
index d3df4b37..d28b1ed9 100755
--- a/src/cli/cli.ts
+++ b/src/cli/cli.ts
@@ -8,7 +8,7 @@ import { DirectiveParser } from '../parsers/directive.parser';
 import { ServiceParser } from '../parsers/service.parser';
 import { MarkerParser } from '../parsers/marker.parser';
 import { PostProcessorInterface } from '../post-processors/post-processor.interface';
-import { SortByKeyPostProcessor } from '../post-processors/sort-by-key.post-processor';
+import { SortByKeyPostProcessor, SortOptions } from '../post-processors/sort-by-key.post-processor';
 import { KeyAsDefaultValuePostProcessor } from '../post-processors/key-as-default-value.post-processor';
 import { NullAsDefaultValuePostProcessor } from '../post-processors/null-as-default-value.post-processor';
 import { StringAsDefaultValuePostProcessor } from '../post-processors/string-as-default-value.post-processor';
@@ -79,7 +79,8 @@ export const cli = y
 	.option('sort', {
 		alias: 's',
 		describe: 'Sort strings in alphabetical order',
-		type: 'boolean'
+		type: 'string',
+		choices: ['', 'case-insensitive']
 	})
 	.option('clean', {
 		alias: 'c',
@@ -138,8 +139,8 @@ if (cli.keyAsDefaultValue) {
 	postProcessors.push(new StringAsDefaultValuePostProcessor({ defaultValue: cli.stringAsDefaultValue as string }));
 }
 
-if (cli.sort) {
-	postProcessors.push(new SortByKeyPostProcessor());
+if (typeof cli.sort !== 'undefined') {
+	postProcessors.push(new SortByKeyPostProcessor(cli.sort as SortOptions));
 }
 extractTask.setPostProcessors(postProcessors);
 
diff --git a/src/post-processors/sort-by-key.post-processor.ts b/src/post-processors/sort-by-key.post-processor.ts
index df4f50a8..6b1ae2bf 100644
--- a/src/post-processors/sort-by-key.post-processor.ts
+++ b/src/post-processors/sort-by-key.post-processor.ts
@@ -1,10 +1,21 @@
 import { TranslationCollection } from '../utils/translation.collection';
 import { PostProcessorInterface } from './post-processor.interface';
 
+export type SortOptions = '' | 'case-insensitive';
+
 export class SortByKeyPostProcessor implements PostProcessorInterface {
 	public name: string = 'SortByKey';
 
+	constructor(private sortOptions: SortOptions) { }
+
 	public process(draft: TranslationCollection, extracted: TranslationCollection, existing: TranslationCollection): TranslationCollection {
-		return draft.sort();
+		if (this.sortOptions === 'case-insensitive') {
+			return draft.sort((a, b) => {
+				return a.toLowerCase().localeCompare(b.toLowerCase());
+			});
+		} else {
+			return draft.sort();
+		}
 	}
 }
+
diff --git a/tests/post-processors/sort-by-key.post-processor.spec.ts b/tests/post-processors/sort-by-key.post-processor.spec.ts
index b1a33ea9..4eb75489 100644
--- a/tests/post-processors/sort-by-key.post-processor.spec.ts
+++ b/tests/post-processors/sort-by-key.post-processor.spec.ts
@@ -4,28 +4,51 @@ import { PostProcessorInterface } from '../../src/post-processors/post-processor
 import { SortByKeyPostProcessor } from '../../src/post-processors/sort-by-key.post-processor';
 import { TranslationCollection } from '../../src/utils/translation.collection';
 
+const mock = {
+	ZZ: 'last value',
+	a: 'a value',
+	'9': 'a numeric key',
+	b: 'another value'
+};
+
+
 describe('SortByKeyPostProcessor', () => {
 	let processor: PostProcessorInterface;
+	let collection: TranslationCollection;
+	let extracted: TranslationCollection;
+	let existing: TranslationCollection;
 
 	beforeEach(() => {
-		processor = new SortByKeyPostProcessor();
+		collection = new TranslationCollection(mock);
+		extracted = new TranslationCollection();
+		existing = new TranslationCollection();
 	});
 
-	it('should sort keys alphanumerically', () => {
-		const collection = new TranslationCollection({
-			z: 'last value',
-			a: 'a value',
+	it('should sort keys alphanumerically (case sensitive)', () => {
+		processor = new SortByKeyPostProcessor('');
+		const sorted = processor.process(collection, extracted, existing).values;
+
+		const sortedOutput = {
 			'9': 'a numeric key',
+			ZZ: 'last value',
+			a: 'a value',
 			b: 'another value'
-		});
-		const extracted = new TranslationCollection();
-		const existing = new TranslationCollection();
+		};
 
-		expect(processor.process(collection, extracted, existing).values).to.deep.equal({
+		expect(JSON.stringify(sorted)).to.deep.equal(JSON.stringify(sortedOutput));
+	});
+
+	it('should sort keys alphanumerically (case insensitive)', () => {
+		processor = new SortByKeyPostProcessor('case-insensitive');
+		const sorted = processor.process(collection, extracted, existing).values;
+
+		const sortedOutput = {
 			'9': 'a numeric key',
 			a: 'a value',
 			b: 'another value',
-			z: 'last value'
-		});
+			ZZ: 'last value'
+		};
+
+		expect(JSON.stringify(sorted)).to.deep.equal(JSON.stringify(sortedOutput));
 	});
 });