diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index cc178200..a71ded23 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -9,6 +9,7 @@ export * from './utils/tl-json'
 export * from './utils/async-lock'
 export * from './utils/lru-map'
 export * from './utils/function-utils'
+export { encodeUrlSafeBase64, parseUrlSafeBase64 } from './utils/buffer-utils'
 
 export { BinaryReader } from './utils/binary/binary-reader'
 export { BinaryWriter } from './utils/binary/binary-writer'
diff --git a/packages/core/src/utils/buffer-utils.ts b/packages/core/src/utils/buffer-utils.ts
index f8f89908..84a40884 100644
--- a/packages/core/src/utils/buffer-utils.ts
+++ b/packages/core/src/utils/buffer-utils.ts
@@ -53,3 +53,17 @@ export function cloneBuffer(buf: Buffer, start = 0, end = buf.length): Buffer {
     buf.copy(ret, 0, start, end)
     return ret
 }
+
+export function parseUrlSafeBase64(str: string): Buffer {
+    str = str.replace(/-/g, '+').replace(/_/g, '/')
+    while (str.length % 4) str += '='
+    return Buffer.from(str, 'base64')
+}
+
+export function encodeUrlSafeBase64(buf: Buffer): string {
+    return buf
+        .toString('base64')
+        .replace(/\+/g, '-')
+        .replace(/\//g, '_')
+        .replace(/=+$/g, '')
+}
diff --git a/packages/core/tests/buffer-utils.spec.ts b/packages/core/tests/buffer-utils.spec.ts
index ad738a2e..c897d5f0 100644
--- a/packages/core/tests/buffer-utils.spec.ts
+++ b/packages/core/tests/buffer-utils.spec.ts
@@ -3,6 +3,8 @@ import { expect } from 'chai'
 import {
     buffersEqual,
     cloneBuffer,
+    encodeUrlSafeBase64,
+    parseUrlSafeBase64,
     randomBytes,
     xorBuffer,
     xorBufferInPlace,
@@ -111,6 +113,27 @@ describe('cloneBuffer', () => {
     })
 })
 
+describe('parseUrlSafeBase64', () => {
+    it('should parse url-safe base64', () => {
+        expect(parseUrlSafeBase64('qu7d8aGTeuF6-g').toString('hex')).eq(
+            'aaeeddf1a1937ae17afa'
+        )
+    })
+    it('should parse normal base64', () => {
+        expect(parseUrlSafeBase64('qu7d8aGTeuF6+g==').toString('hex')).eq(
+            'aaeeddf1a1937ae17afa'
+        )
+    })
+})
+
+describe('encodeUrlSafeBase64', () => {
+    it('should encode to url-safe base64', () => {
+        expect(
+            encodeUrlSafeBase64(Buffer.from('aaeeddf1a1937ae17afa', 'hex'))
+        ).eq('qu7d8aGTeuF6-g')
+    })
+})
+
 // describe('isProbablyPlainText', () => {
 //     it('should return true for buffers only containing printable ascii', () => {
 //         expect(
diff --git a/packages/file-id/src/parse.ts b/packages/file-id/src/parse.ts
index 9757fb36..652d5cf2 100644
--- a/packages/file-id/src/parse.ts
+++ b/packages/file-id/src/parse.ts
@@ -1,6 +1,6 @@
-import { parseUrlSafeBase64, telegramRleDecode } from './utils'
+import { telegramRleDecode } from './utils'
 import { tdFileId as td } from './types'
-import { BinaryReader } from '@mtcute/core'
+import { BinaryReader, parseUrlSafeBase64 } from '@mtcute/core'
 
 function parseWebFileLocation(
     reader: BinaryReader
diff --git a/packages/file-id/src/serialize-unique.ts b/packages/file-id/src/serialize-unique.ts
index 9c503a04..dfde5de2 100644
--- a/packages/file-id/src/serialize-unique.ts
+++ b/packages/file-id/src/serialize-unique.ts
@@ -1,6 +1,6 @@
 import { tdFileId, tdFileId as td } from './types'
-import { BinaryWriter } from '@mtcute/core/src/utils/binary/binary-writer'
-import { encodeUrlSafeBase64, telegramRleEncode } from './utils'
+import { encodeUrlSafeBase64, BinaryWriter } from '@mtcute/core'
+import { telegramRleEncode } from './utils'
 import FileType = tdFileId.FileType
 
 type InputUniqueLocation =
diff --git a/packages/file-id/src/serialize.ts b/packages/file-id/src/serialize.ts
index 93f62a23..6cf4673e 100644
--- a/packages/file-id/src/serialize.ts
+++ b/packages/file-id/src/serialize.ts
@@ -1,6 +1,6 @@
 import { tdFileId as td } from './types'
-import { BinaryWriter } from '@mtcute/core/src/utils/binary/binary-writer'
-import { encodeUrlSafeBase64, telegramRleEncode } from './utils'
+import { encodeUrlSafeBase64, BinaryWriter } from '@mtcute/core'
+import { telegramRleEncode } from './utils'
 
 const SUFFIX = Buffer.from([td.CURRENT_VERSION, td.PERSISTENT_ID_VERSION])
 
diff --git a/packages/file-id/src/utils.ts b/packages/file-id/src/utils.ts
index fb236c04..75821901 100644
--- a/packages/file-id/src/utils.ts
+++ b/packages/file-id/src/utils.ts
@@ -1,17 +1,3 @@
-export function parseUrlSafeBase64(str: string): Buffer {
-    str = str.replace(/-/g, '+').replace(/_/g, '/')
-    while (str.length % 4) str += '='
-    return Buffer.from(str, 'base64')
-}
-
-export function encodeUrlSafeBase64(buf: Buffer): string {
-    return buf
-        .toString('base64')
-        .replace(/\+/g, '-')
-        .replace(/\//g, '_')
-        .replace(/=+$/g, '')
-}
-
 // telegram has some cursed RLE which only encodes consecutive \x00
 
 export function telegramRleEncode(buf: Buffer): Buffer {
diff --git a/packages/file-id/tests/utils.spec.ts b/packages/file-id/tests/utils.spec.ts
index 44ff9134..79c2a2ea 100644
--- a/packages/file-id/tests/utils.spec.ts
+++ b/packages/file-id/tests/utils.spec.ts
@@ -1,33 +1,10 @@
 import { describe, it } from 'mocha'
 import { expect } from 'chai'
 import {
-    encodeUrlSafeBase64,
-    parseUrlSafeBase64,
     telegramRleDecode,
     telegramRleEncode,
 } from '../src/utils'
 
-describe('parseUrlSafeBase64', () => {
-    it('should parse url-safe base64', () => {
-        expect(parseUrlSafeBase64('qu7d8aGTeuF6-g').toString('hex')).eq(
-            'aaeeddf1a1937ae17afa'
-        )
-    })
-    it('should parse normal base64', () => {
-        expect(parseUrlSafeBase64('qu7d8aGTeuF6+g==').toString('hex')).eq(
-            'aaeeddf1a1937ae17afa'
-        )
-    })
-})
-
-describe('encodeUrlSafeBase64', () => {
-    it('should encode to url-safe base64', () => {
-        expect(
-            encodeUrlSafeBase64(Buffer.from('aaeeddf1a1937ae17afa', 'hex'))
-        ).eq('qu7d8aGTeuF6-g')
-    })
-})
-
 describe('telegramRleEncode', () => {
     it('should not modify input if there are no \\x00', () => {
         expect(