diff --git a/cid/cid.go b/cid/cid.go
index 2fb1666..30a5245 100644
--- a/cid/cid.go
+++ b/cid/cid.go
@@ -1,11 +1,16 @@
 package cid
 
 import (
+	"encoding/binary"
 	"github.com/multiformats/go-multibase"
 )
 
-func EncodeHashSimple(hash [32]byte) (string, error) {
+func EncodeHashSimple(hash [32]byte, size uint64) (string, error) {
+	sizeBytes := make([]byte, 8)
+	binary.LittleEndian.PutUint64(sizeBytes, size)
+
 	prefixedHash := append([]byte{0x26, 0x1f}, hash[:]...)
+	prefixedHash = append(prefixedHash, sizeBytes...)
 
 	return multibase.Encode(multibase.Base58BTC, prefixedHash)
 }
diff --git a/service/files_service.go b/service/files_service.go
index 540154c..4dd21f2 100644
--- a/service/files_service.go
+++ b/service/files_service.go
@@ -35,7 +35,7 @@ func InitFiles() {
 func (f *FilesService) PostUpload() {
 	ctx := f.Ctx
 
-	file, _, err := f.Ctx.FormFile("file")
+	file, meta, err := f.Ctx.FormFile("file")
 	if internalErrorCustom(ctx, err, errors.New("invalid file data")) {
 		return
 	}
@@ -49,7 +49,7 @@ func (f *FilesService) PostUpload() {
 
 	hashBytes := blake3.Sum256(buf.Bytes())
 	hashHex := hex.EncodeToString(hashBytes[:])
-	fileCid, err := cid.EncodeHashSimple(hashBytes)
+	fileCid, err := cid.EncodeHashSimple(hashBytes, uint64(meta.Size))
 
 	if internalError(ctx, err) {
 		return