diff --git a/__tests__/humanFileSize.spec.ts b/__tests__/humanFileSize.spec.ts
index acba5dba..192c7f2b 100644
--- a/__tests__/humanFileSize.spec.ts
+++ b/__tests__/humanFileSize.spec.ts
@@ -4,8 +4,8 @@ import { formatFileSize, parseFileSize } from '../lib/humanfilesize'
 
 describe('humanFileSize', () => {
 	describe('formatFileSize', () => {
-		it('renders binary sizes by default', () => {
-			expect(formatFileSize(2048)).toBe('2 KiB')
+		it('renders binary size with decimal units by default', () => {
+			expect(formatFileSize(2048)).toBe('2 KB')
 		})
 
 		it('renders file sizes with the correct unit', function() {
@@ -32,12 +32,14 @@ describe('humanFileSize', () => {
 				[128000000000000, '116.4 TiB'],
 				[128000000000000.0, '116.4 TiB'],
 				[128000000000000000.0, '113.7 PiB'],
-			]
+			] as const
 			for (let i = 0; i < dataDecimal.length; i++) {
-				expect(formatFileSize(dataDecimal[i][0], false, false)).toEqual(dataDecimal[i][1])
+				expect(formatFileSize(dataDecimal[i][0], false, false, true)).toEqual(dataDecimal[i][1])
 			}
 			for (let i = 0; i < dataBinary.length; i++) {
 				expect(formatFileSize(dataBinary[i][0], false, true)).toEqual(dataBinary[i][1])
+				// Binary sizes but decimal units
+				expect(formatFileSize(dataBinary[i][0], false, false)).toEqual(dataBinary[i][1].replace('i', ''))
 			}
 		})
 
@@ -61,12 +63,14 @@ describe('humanFileSize', () => {
 				[128000000000000, '116.4 TiB'],
 				[128000000000000.0, '116.4 TiB'],
 				[128000000000000000.0, '113.7 PiB'],
-			]
+			] as const
 			for (let i = 0; i < dataDecimal.length; i++) {
-				expect(formatFileSize(dataDecimal[i][0], true, false)).toEqual(dataDecimal[i][1])
+				expect(formatFileSize(dataDecimal[i][0], true, false, true)).toEqual(dataDecimal[i][1])
 			}
 			for (let i = 0; i < dataBinary.length; i++) {
 				expect(formatFileSize(dataBinary[i][0], true, true)).toEqual(dataBinary[i][1])
+				// Binary sizes but decimal units
+				expect(formatFileSize(dataBinary[i][0], true, false)).toEqual(dataBinary[i][1].replace('i', ''))
 			}
 		})
 
@@ -95,12 +99,14 @@ describe('humanFileSize', () => {
 				[128000000000000, '116,4 TiB'],
 				[128000000000000.0, '116,4 TiB'],
 				[128000000000000000.0, '113,7 PiB'],
-			]
+			] as const
 			for (let i = 0; i < dataDecimal.length; i++) {
-				expect(formatFileSize(dataDecimal[i][0], false, false)).toEqual(dataDecimal[i][1])
+				expect(formatFileSize(dataDecimal[i][0], false, false, true)).toEqual(dataDecimal[i][1])
 			}
 			for (let i = 0; i < dataBinary.length; i++) {
 				expect(formatFileSize(dataBinary[i][0], false, true)).toEqual(dataBinary[i][1])
+				// Binary sizes but decimal units
+				expect(formatFileSize(dataBinary[i][0], false, false)).toEqual(dataBinary[i][1].replace('i', ''))
 			}
 		})
 	})
diff --git a/lib/humanfilesize.ts b/lib/humanfilesize.ts
index 49765e54..a34a8476 100644
--- a/lib/humanfilesize.ts
+++ b/lib/humanfilesize.ts
@@ -29,28 +29,30 @@ const humanListBinary = ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB']
 /**
  * Format a file size in a human-like format. e.g. 42GB
  *
+ * The default for Nextcloud is like Windows using binary sizes but showing decimal units,
+ * meaning 1024 bytes will show as 1KB instead of 1KiB or like on Apple 1.02 KB
+ *
  * @param size in bytes
  * @param skipSmallSizes avoid rendering tiny sizes and return '< 1 KB' instead
- * @param binaryPrefixes True if size base 2 (and binary prefixes like `KiB`) should be used
+ * @param binaryPrefixes True if size binary prefixes like `KiB` should be used as per IEC 80000-13
+ * @param base1000 Set to true to use base 1000 as per SI or used by Apple (default is base 1024 like Linux or Windows)
  */
-export function formatFileSize(size: number|string, skipSmallSizes = false, binaryPrefixes = true): string {
+export function formatFileSize(size: number|string, skipSmallSizes = false, binaryPrefixes = false, base1000 = false): string {
+	// Binary prefixes only work with base 1024
+	binaryPrefixes = binaryPrefixes && !base1000
 
 	if (typeof size === 'string') {
 		size = Number(size)
 	}
 
-	/*
-	* @note This block previously used Log base 1024, per IEC 80000-13;
-	* however, the wrong prefix was used. Now we use decimal calculation
-	* with base 1000 per the SI. Base 1024 calculation with binary
-	* prefixes is optional, but has yet to be added to the UI.
-	*/
 	// Calculate Log with base 1024 or 1000: size = base ** order
-	let order = size > 0 ? Math.floor(Math.log(size) / Math.log(binaryPrefixes ? 1024 : 1000)) : 0
+	let order = size > 0 ? Math.floor(Math.log(size) / Math.log(base1000 ? 1000 : 1024)) : 0
+
 	// Stay in range of the byte sizes that are defined
 	order = Math.min((binaryPrefixes ? humanListBinary.length : humanList.length) - 1, order)
+
 	const readableFormat = binaryPrefixes ? humanListBinary[order] : humanList[order]
-	let relativeSize = (size / Math.pow(binaryPrefixes ? 1024 : 1000, order)).toFixed(1)
+	let relativeSize = (size / Math.pow(base1000 ? 1000 : 1024, order)).toFixed(1)
 
 	if (skipSmallSizes === true && order === 0) {
 		return (relativeSize !== '0.0' ? '< 1 ' : '0 ') + (binaryPrefixes ? humanListBinary[1] : humanList[1])