ZeroServer.tools

Protocol Buffer Formatter

Format and indent .proto (Protocol Buffer) files for readability.

Input .proto

Formatted output

syntax = "proto3";
package example;
import "google/protobuf/timestamp.proto";

message User {
  int32 id = 1;
  string name = 2;
  string email = 3;
  repeated string roles = 4;
  google.protobuf.Timestamp created_at = 5;
}

service UserService {
  rpc GetUser(GetUserRequest) returns (User);
  rpc ListUsers(ListUsersRequest) returns (ListUsersResponse);
}

message GetUserRequest {
  int32 id = 1;
}

enum Status {
  STATUS_UNKNOWN = 0;
  STATUS_ACTIVE = 1;
  STATUS_INACTIVE = 2;
}

Protocol Buffer Formatter — clean, indent, and beautify .proto files

Protocol Buffers (protobuf) is Google's language-neutral data serialization format. The .proto schema file defines messages, services, and enums that are compiled into language-specific code. This formatter normalizes indentation to 2 spaces, adds blank lines between top-level declarations, and ensures consistent brace placement — making large .proto files with dozens of messages far easier to read and maintain. It handles message, service, enum, and nested types correctly.

Private & free — this tool runs entirely in your browser.