diff --git a/backend/box/box.go b/backend/box/box.go
index 1781f0d33..defe8e0eb 100644
--- a/backend/box/box.go
+++ b/backend/box/box.go
@@ -36,6 +36,7 @@ import (
 	"github.com/rclone/rclone/fs/config/configmap"
 	"github.com/rclone/rclone/fs/config/configstruct"
 	"github.com/rclone/rclone/fs/config/obscure"
+	"github.com/rclone/rclone/fs/encodings"
 	"github.com/rclone/rclone/fs/fserrors"
 	"github.com/rclone/rclone/fs/fshttp"
 	"github.com/rclone/rclone/fs/hash"
@@ -47,6 +48,8 @@ import (
 	"golang.org/x/oauth2/jws"
 )
 
+const enc = encodings.Box
+
 const (
 	rcloneClientID              = "d0374ba6pgmaguie02ge15sv1mllndho"
 	rcloneEncryptedClientSecret = "sYbJYm99WB8jzeaLPU0OPDMJKIkZvD2qOn3SyEMfiJr03RdtDt3xcZEIudRhbIDL"
@@ -298,18 +301,6 @@ func shouldRetry(resp *http.Response, err error) (bool, error) {
 	return authRetry || fserrors.ShouldRetry(err) || fserrors.ShouldRetryHTTP(resp, retryErrorCodes), err
 }
 
-// substitute reserved characters for box
-func replaceReservedChars(x string) string {
-	// Backslash for FULLWIDTH REVERSE SOLIDUS
-	return strings.Replace(x, "\\", "＼", -1)
-}
-
-// restore reserved characters for box
-func restoreReservedChars(x string) string {
-	// FULLWIDTH REVERSE SOLIDUS for Backslash
-	return strings.Replace(x, "＼", "\\", -1)
-}
-
 // readMetaDataForPath reads the metadata from the path
 func (f *Fs) readMetaDataForPath(ctx context.Context, path string) (info *api.Item, err error) {
 	// defer fs.Trace(f, "path=%q", path)("info=%+v, err=%v", &info, &err)
@@ -497,7 +488,7 @@ func (f *Fs) CreateDir(ctx context.Context, pathID, leaf string) (newID string,
 		Parameters: fieldsValue(),
 	}
 	mkdir := api.CreateFolder{
-		Name: replaceReservedChars(leaf),
+		Name: enc.FromStandardName(leaf),
 		Parent: api.Parent{
 			ID: pathID,
 		},
@@ -563,7 +554,7 @@ OUTER:
 			if item.ItemStatus != api.ItemStatusActive {
 				continue
 			}
-			item.Name = restoreReservedChars(item.Name)
+			item.Name = enc.ToStandardName(item.Name)
 			if fn(item) {
 				found = true
 				break OUTER
@@ -799,9 +790,8 @@ func (f *Fs) Copy(ctx context.Context, src fs.Object, remote string) (fs.Object,
 		Path:       "/files/" + srcObj.id + "/copy",
 		Parameters: fieldsValue(),
 	}
-	replacedLeaf := replaceReservedChars(leaf)
 	copyFile := api.CopyFile{
-		Name: replacedLeaf,
+		Name: enc.FromStandardName(leaf),
 		Parent: api.Parent{
 			ID: directoryID,
 		},
@@ -840,7 +830,7 @@ func (f *Fs) move(ctx context.Context, endpoint, id, leaf, directoryID string) (
 		Parameters: fieldsValue(),
 	}
 	move := api.UpdateFileMove{
-		Name: replaceReservedChars(leaf),
+		Name: enc.FromStandardName(leaf),
 		Parent: api.Parent{
 			ID: directoryID,
 		},
@@ -1041,11 +1031,6 @@ func (o *Object) Remote() string {
 	return o.remote
 }
 
-// srvPath returns a path for use in server
-func (o *Object) srvPath() string {
-	return replaceReservedChars(o.fs.rootSlash() + o.remote)
-}
-
 // Hash returns the SHA-1 of an object returning a lowercase hex string
 func (o *Object) Hash(ctx context.Context, t hash.Type) (string, error) {
 	if t != hash.SHA1 {
@@ -1170,7 +1155,7 @@ func (o *Object) Open(ctx context.Context, options ...fs.OpenOption) (in io.Read
 // This is recommended for less than 50 MB of content
 func (o *Object) upload(ctx context.Context, in io.Reader, leaf, directoryID string, modTime time.Time) (err error) {
 	upload := api.UploadFile{
-		Name:              replaceReservedChars(leaf),
+		Name:              enc.FromStandardName(leaf),
 		ContentModifiedAt: api.Time(modTime),
 		ContentCreatedAt:  api.Time(modTime),
 		Parent: api.Parent{
diff --git a/backend/box/upload.go b/backend/box/upload.go
index d413a8483..e853f8f35 100644
--- a/backend/box/upload.go
+++ b/backend/box/upload.go
@@ -38,7 +38,7 @@ func (o *Object) createUploadSession(ctx context.Context, leaf, directoryID stri
 	} else {
 		opts.Path = "/files/upload_sessions"
 		request.FolderID = directoryID
-		request.FileName = replaceReservedChars(leaf)
+		request.FileName = enc.FromStandardName(leaf)
 	}
 	var resp *http.Response
 	err = o.fs.pacer.Call(func() (bool, error) {
diff --git a/docs/content/box.md b/docs/content/box.md
index cf13a5479..768b20df3 100644
--- a/docs/content/box.md
+++ b/docs/content/box.md
@@ -196,6 +196,25 @@ not.
 Box supports SHA1 type hashes, so you can use the `--checksum`
 flag.
 
+#### Restricted filename characters
+
+In addition to the [default restricted characters set](/overview/#restricted-characters)
+the following characters are also replaced:
+
+| Character | Value | Replacement |
+| --------- |:-----:|:-----------:|
+| \         | 0x5C  | ＼           |
+
+File names can also not end with the following characters.
+These only get replaced if they are last character in the name:
+
+| Character | Value | Replacement |
+| --------- |:-----:|:-----------:|
+| SP        | 0x20  | ␠           |
+
+Invalid UTF-8 bytes will also be [replaced](/overview/#invalid-utf8),
+as they can't be used in JSON strings.
+
 ### Transfers ###
 
 For files above 50MB rclone will use a chunked transfer.  Rclone will