diff --git a/apps/desktop/src/components/transfer/__tests__/queryResultTransferValues.spec.ts b/apps/desktop/src/components/transfer/__tests__/queryResultTransferValues.spec.ts
index 0faff1fac7..5aab387c68 100644
--- a/apps/desktop/src/components/transfer/__tests__/queryResultTransferValues.spec.ts
+++ b/apps/desktop/src/components/transfer/__tests__/queryResultTransferValues.spec.ts
@@ -22,6 +22,12 @@ describe("query result transfer value literals", () => {
     expect(queryResultTransferSqlLiteral("0x0001fe", "postgres", "timestamp", "bytea", "sqlserver")).toBe("decode('0001fe', 'hex')");
   });
 
+  it("maps uniqueidentifier and uuid to target types appropriately", () => {
+    expect(queryResultTransferTargetType("uniqueidentifier", "postgres", "sqlserver")).toBe("uuid");
+    expect(queryResultTransferTargetType("uuid", "sqlserver", "postgres")).toBe("uniqueidentifier");
+    expect(queryResultTransferTargetType("uniqueidentifier", "mysql", "sqlserver")).toBe("char(36)");
+  });
+
   it("fails closed for an unverified binary dialect", () => {
     expect(queryResultTransferSqlLiteral("0x0001fe", "hive", "binary", "BINARY")).toBeUndefined();
   });
diff --git a/apps/desktop/src/components/transfer/queryResultTransferValues.ts b/apps/desktop/src/components/transfer/queryResultTransferValues.ts
index a915b1283a..dbe4d89a97 100644
--- a/apps/desktop/src/components/transfer/queryResultTransferValues.ts
+++ b/apps/desktop/src/components/transfer/queryResultTransferValues.ts
@@ -260,6 +260,12 @@ export function queryResultTransferTargetType(sourceType: string | undefined, da
     if (databaseType === "h2" || databaseType === "db2") return "BLOB";
     return "BLOB";
   }
+  if (/^(?:uuid|uniqueidentifier)$/.test(type)) {
+    if (POSTGRES_TYPES.has(databaseType)) return "uuid";
+    if (databaseType === "sqlserver") return "uniqueidentifier";
+    if (databaseType === "mysql") return "char(36)";
+    return textTargetType(databaseType);
+  }
   return textTargetType(databaseType);
 }
 
diff --git a/apps/desktop/src/lib/__tests__/diff/fieldMappingPresets.spec.ts b/apps/desktop/src/lib/__tests__/diff/fieldMappingPresets.spec.ts
new file mode 100644
index 0000000000..09938c41eb
--- /dev/null
+++ b/apps/desktop/src/lib/__tests__/diff/fieldMappingPresets.spec.ts
@@ -0,0 +1,37 @@
+import { describe, expect, it } from "vitest";
+import { findPreset } from "@/lib/fieldMappingPresets";
+
+describe("fieldMappingPresets", () => {
+  it("contains sqlserver-to-postgresql preset", () => {
+    const preset = findPreset("sqlserver", "postgresql");
+    expect(preset).toBeDefined();
+    expect(preset?.id).toBe("sqlserver-to-postgresql");
+
+    const uuidMapping = preset?.mappings.find((m) => m.sourceType === "UNIQUEIDENTIFIER");
+    expect(uuidMapping).toBeDefined();
+    expect(uuidMapping?.targetType).toBe("UUID");
+    expect(uuidMapping?.paramStrategy).toBe("strip");
+  });
+
+  it("supports postgres alias for postgresql", () => {
+    const preset = findPreset("sqlserver", "postgres");
+    expect(preset).toBeDefined();
+    expect(preset?.id).toBe("sqlserver-to-postgresql");
+  });
+
+  it("supports reverse match postgresql to sqlserver", () => {
+    const preset = findPreset("postgresql", "sqlserver");
+    expect(preset).toBeDefined();
+    expect(preset?.id).toBe("sqlserver-to-postgresql-reverse");
+
+    const uuidMapping = preset?.mappings.find((m) => m.sourceType === "UUID");
+    expect(uuidMapping).toBeDefined();
+    expect(uuidMapping?.targetType).toBe("UNIQUEIDENTIFIER");
+  });
+
+  it("supports reverse match postgres to sqlserver", () => {
+    const preset = findPreset("postgres", "sqlserver");
+    expect(preset).toBeDefined();
+    expect(preset?.id).toBe("sqlserver-to-postgresql-reverse");
+  });
+});
diff --git a/apps/desktop/src/lib/fieldMappingPresets.ts b/apps/desktop/src/lib/fieldMappingPresets.ts
index 9199c26909..72f3e67f0f 100644
--- a/apps/desktop/src/lib/fieldMappingPresets.ts
+++ b/apps/desktop/src/lib/fieldMappingPresets.ts
@@ -85,15 +85,61 @@ export const FIELD_MAPPING_PRESETS: FieldMappingPreset[] = [
       { sourceType: "BOOLEAN", targetType: "NUMBER(1)", paramStrategy: "custom", customParams: "(1)" },
     ],
   },
+  {
+    id: "sqlserver-to-postgresql",
+    label: "SQL Server → PostgreSQL",
+    sourceDialect: "sqlserver",
+    targetDialect: "postgresql",
+    mappings: [
+      { sourceType: "VARCHAR", targetType: "VARCHAR", paramStrategy: "preserve" },
+      { sourceType: "NVARCHAR", targetType: "VARCHAR", paramStrategy: "preserve" },
+      { sourceType: "CHAR", targetType: "CHAR", paramStrategy: "preserve" },
+      { sourceType: "NCHAR", targetType: "CHAR", paramStrategy: "preserve" },
+      { sourceType: "TEXT", targetType: "TEXT", paramStrategy: "strip" },
+      { sourceType: "NTEXT", targetType: "TEXT", paramStrategy: "strip" },
+      { sourceType: "INT", targetType: "INTEGER", paramStrategy: "preserve" },
+      { sourceType: "BIGINT", targetType: "BIGINT", paramStrategy: "preserve" },
+      { sourceType: "SMALLINT", targetType: "SMALLINT", paramStrategy: "preserve" },
+      { sourceType: "TINYINT", targetType: "SMALLINT", paramStrategy: "preserve" },
+      { sourceType: "BIT", targetType: "BOOLEAN", paramStrategy: "strip" },
+      { sourceType: "DECIMAL", targetType: "NUMERIC", paramStrategy: "preserve" },
+      { sourceType: "NUMERIC", targetType: "NUMERIC", paramStrategy: "preserve" },
+      { sourceType: "MONEY", targetType: "NUMERIC", paramStrategy: "strip" },
+      { sourceType: "SMALLMONEY", targetType: "NUMERIC", paramStrategy: "strip" },
+      { sourceType: "FLOAT", targetType: "DOUBLE PRECISION", paramStrategy: "strip" },
+      { sourceType: "REAL", targetType: "REAL", paramStrategy: "strip" },
+      { sourceType: "DATE", targetType: "DATE", paramStrategy: "preserve" },
+      { sourceType: "DATETIME", targetType: "TIMESTAMP", paramStrategy: "preserve" },
+      { sourceType: "DATETIME2", targetType: "TIMESTAMP", paramStrategy: "preserve" },
+      { sourceType: "SMALLDATETIME", targetType: "TIMESTAMP", paramStrategy: "strip" },
+      { sourceType: "DATETIMEOFFSET", targetType: "TIMESTAMPTZ", paramStrategy: "preserve" },
+      { sourceType: "TIME", targetType: "TIME", paramStrategy: "preserve" },
+      { sourceType: "UNIQUEIDENTIFIER", targetType: "UUID", paramStrategy: "strip" },
+      { sourceType: "VARBINARY", targetType: "BYTEA", paramStrategy: "strip" },
+      { sourceType: "BINARY", targetType: "BYTEA", paramStrategy: "strip" },
+      { sourceType: "IMAGE", targetType: "BYTEA", paramStrategy: "strip" },
+      { sourceType: "XML", targetType: "XML", paramStrategy: "strip" },
+    ],
+  },
 ];
 
+function normalizeDialect(dialect: string): string {
+  const d = dialect.trim().toLowerCase();
+  if (d === "postgres" || d === "postgresql") return "postgresql";
+  if (d === "sqlserver" || d === "mssql") return "sqlserver";
+  return d;
+}
+
 export function findPreset(sourceDialect: string, targetDialect: string): FieldMappingPreset | undefined {
+  const src = normalizeDialect(sourceDialect);
+  const tgt = normalizeDialect(targetDialect);
+
   // Look for exact forward match
-  const forward = FIELD_MAPPING_PRESETS.find((p) => p.sourceDialect === sourceDialect && p.targetDialect === targetDialect);
+  const forward = FIELD_MAPPING_PRESETS.find((p) => p.sourceDialect === src && p.targetDialect === tgt);
   if (forward) return forward;
 
   // Look for reverse match and auto-generate bidirectional preset
-  const reverse = FIELD_MAPPING_PRESETS.find((p) => p.sourceDialect === targetDialect && p.targetDialect === sourceDialect);
+  const reverse = FIELD_MAPPING_PRESETS.find((p) => p.sourceDialect === tgt && p.targetDialect === src);
   if (reverse) {
     return {
       id: `${reverse.id}-reverse`,
diff --git a/crates/dbx-sql-dialect/src/sql_dialect/ddl_profile.rs b/crates/dbx-sql-dialect/src/sql_dialect/ddl_profile.rs
index 4668b04a33..dc2efd051c 100644
--- a/crates/dbx-sql-dialect/src/sql_dialect/ddl_profile.rs
+++ b/crates/dbx-sql-dialect/src/sql_dialect/ddl_profile.rs
@@ -363,6 +363,11 @@ const SQLITE_TYPE_MAP: &[TypeMapEntry] = &[
     TypeMapEntry { source_base: "JSON", target_template: "TEXT" },
 ];
 
+const POSTGRES_TYPE_MAP: &[TypeMapEntry] = &[
+    TypeMapEntry { source_base: "UNIQUEIDENTIFIER", target_template: "UUID" },
+    TypeMapEntry { source_base: "GUID", target_template: "UUID" },
+];
+
 // ---------------------------------------------------------------------------
 // Profile families (shared shapes; registration is the only DatabaseType match)
 // ---------------------------------------------------------------------------
@@ -469,7 +474,7 @@ fn postgres_family(db: DatabaseType) -> DdlDialectProfile {
         owner_alter_template: Some(OWNER_ALTER),
         drop_table_template: DROP_TABLE,
         lock_timeout_sql: Some("SET lock_timeout = '3s';"),
-        type_map: &[],
+        type_map: POSTGRES_TYPE_MAP,
     }
 }
 
diff --git a/crates/dbx-sql-dialect/src/sql_dialect/descriptor.rs b/crates/dbx-sql-dialect/src/sql_dialect/descriptor.rs
index 0f20f8cb58..2978c63ef0 100644
--- a/crates/dbx-sql-dialect/src/sql_dialect/descriptor.rs
+++ b/crates/dbx-sql-dialect/src/sql_dialect/descriptor.rs
@@ -870,6 +870,220 @@ impl TypeMappingMatrix {
                     requires_cast: false,
                 });
             }
+            (DialectKind::SqlServer, DialectKind::Postgres) => {
+                rules.push(TypeConversionRule {
+                    source_type: "UNIQUEIDENTIFIER".into(),
+                    target_type: "UUID".into(),
+                    precision_loss: false,
+                    requires_cast: true,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "BIT".into(),
+                    target_type: "BOOLEAN".into(),
+                    precision_loss: false,
+                    requires_cast: true,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "TINYINT".into(),
+                    target_type: "SMALLINT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "SMALLINT".into(),
+                    target_type: "SMALLINT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "INT".into(),
+                    target_type: "INTEGER".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "BIGINT".into(),
+                    target_type: "BIGINT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "REAL".into(),
+                    target_type: "REAL".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "FLOAT".into(),
+                    target_type: "DOUBLE PRECISION".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "MONEY".into(),
+                    target_type: "NUMERIC(19,4)".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "SMALLMONEY".into(),
+                    target_type: "NUMERIC(10,4)".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "NVARCHAR(MAX)".into(),
+                    target_type: "TEXT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "VARCHAR(MAX)".into(),
+                    target_type: "TEXT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "NTEXT".into(),
+                    target_type: "TEXT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "TEXT".into(),
+                    target_type: "TEXT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "VARBINARY(MAX)".into(),
+                    target_type: "BYTEA".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "IMAGE".into(),
+                    target_type: "BYTEA".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "ROWVERSION".into(),
+                    target_type: "BYTEA".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "DATETIME".into(),
+                    target_type: "TIMESTAMP".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "DATETIME2".into(),
+                    target_type: "TIMESTAMP".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "SMALLDATETIME".into(),
+                    target_type: "TIMESTAMP".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "DATETIMEOFFSET".into(),
+                    target_type: "TIMESTAMPTZ".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "XML".into(),
+                    target_type: "XML".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+            }
+            (DialectKind::Postgres, DialectKind::SqlServer) => {
+                rules.push(TypeConversionRule {
+                    source_type: "UUID".into(),
+                    target_type: "UNIQUEIDENTIFIER".into(),
+                    precision_loss: false,
+                    requires_cast: true,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "BOOLEAN".into(),
+                    target_type: "BIT".into(),
+                    precision_loss: false,
+                    requires_cast: true,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "SMALLINT".into(),
+                    target_type: "SMALLINT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "INTEGER".into(),
+                    target_type: "INT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "BIGINT".into(),
+                    target_type: "BIGINT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "REAL".into(),
+                    target_type: "REAL".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "DOUBLE PRECISION".into(),
+                    target_type: "FLOAT".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "TEXT".into(),
+                    target_type: "NVARCHAR(MAX)".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "BYTEA".into(),
+                    target_type: "VARBINARY(MAX)".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "TIMESTAMP".into(),
+                    target_type: "DATETIME2".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "TIMESTAMPTZ".into(),
+                    target_type: "DATETIMEOFFSET".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "JSONB".into(),
+                    target_type: "NVARCHAR(MAX)".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+                rules.push(TypeConversionRule {
+                    source_type: "JSON".into(),
+                    target_type: "NVARCHAR(MAX)".into(),
+                    precision_loss: false,
+                    requires_cast: false,
+                });
+            }
             _ => {}
         }
         rules
@@ -1146,4 +1360,12 @@ mod tests {
         assert!(!desc.supports_schemas);
         assert!(!desc.supports_partitioning);
     }
+
+    #[test]
+    fn sqlserver_to_postgres_mapping() {
+        let matrix = TypeMappingMatrix::for_dialects(DialectKind::SqlServer, DialectKind::Postgres);
+        let (converted, requires_cast) = matrix.convert_type("uniqueidentifier");
+        assert_eq!(converted, "UUID");
+        assert!(requires_cast);
+    }
 }
diff --git a/crates/dbx-sql-dialect/src/sql_dialect/inference.rs b/crates/dbx-sql-dialect/src/sql_dialect/inference.rs
index db0c6bcccd..29101c6a7a 100644
--- a/crates/dbx-sql-dialect/src/sql_dialect/inference.rs
+++ b/crates/dbx-sql-dialect/src/sql_dialect/inference.rs
@@ -196,6 +196,8 @@ impl TypeInferenceEngine for DefaultTypeInferenceEngine {
             ("boolean", "bool"),
             ("timestamp", "datetime"),
             ("datetime", "timestamp"),
+            ("uniqueidentifier", "uuid"),
+            ("uuid", "uniqueidentifier"),
         ];
         if exact_matches.contains(&(source_lower.as_str(), target_lower.as_str())) {
             return SCORE_ALIAS;
diff --git a/crates/dbx-sql-dialect/src/sql_dialect/type_rewrite.rs b/crates/dbx-sql-dialect/src/sql_dialect/type_rewrite.rs
index 589eccc7c5..245c7c3943 100644
--- a/crates/dbx-sql-dialect/src/sql_dialect/type_rewrite.rs
+++ b/crates/dbx-sql-dialect/src/sql_dialect/type_rewrite.rs
@@ -620,4 +620,13 @@ mod tests {
         assert_eq!(normalize_len_params("(unclosed"), "(unclosed");
         assert_eq!(normalize_len_params(")"), ")");
     }
+
+    #[test]
+    fn postgres_rewrites_uniqueidentifier_to_uuid() {
+        let target = DatabaseType::Postgres;
+        let source = Some(DialectKind::SqlServer);
+        assert_eq!(rewrite_column_type("uniqueidentifier", target, source), "UUID");
+        assert_eq!(rewrite_column_type("UNIQUEIDENTIFIER", target, source), "UUID");
+        assert_eq!(rewrite_column_type("uniqueidentifier", target, None), "UUID");
+    }
 }
diff --git a/crates/dbx-sql-schema/src/schema_diff.rs b/crates/dbx-sql-schema/src/schema_diff.rs
index ac33bba9f3..91b9832ae8 100644
--- a/crates/dbx-sql-schema/src/schema_diff.rs
+++ b/crates/dbx-sql-schema/src/schema_diff.rs
@@ -3219,6 +3219,19 @@ fn column_types_equal_for_dialects(
     if source_type.eq_ignore_ascii_case(target_type) {
         return true;
     }
+    match (source_dialect, target_dialect) {
+        (Some(DialectKind::SqlServer), Some(DialectKind::Postgres))
+            if source_type.eq_ignore_ascii_case("uniqueidentifier") && target_type.eq_ignore_ascii_case("uuid") =>
+        {
+            return true;
+        }
+        (Some(DialectKind::Postgres), Some(DialectKind::SqlServer))
+            if source_type.eq_ignore_ascii_case("uuid") && target_type.eq_ignore_ascii_case("uniqueidentifier") =>
+        {
+            return true;
+        }
+        _ => {}
+    }
     if source_dialect != Some(DialectKind::Mysql) || target_dialect != Some(DialectKind::Mysql) {
         return false;
     }
@@ -3268,6 +3281,8 @@ fn column_type_similarity_score(source_type: &str, target_type: &str) -> f64 {
         ("boolean", "bool"),
         ("timestamp", "datetime"),
         ("datetime", "timestamp"),
+        ("uniqueidentifier", "uuid"),
+        ("uuid", "uniqueidentifier"),
     ];
     if exact_matches.contains(&(s.as_str(), t.as_str())) {
         return 1.0;
@@ -15738,4 +15753,22 @@ mod tests {
         assert!(sql.contains("CREATE OR REPLACE FORCE VIEW DBX_TGT.V_NEW"), "{sql}");
         assert!(!sql.contains("DBX_TEST.V_NEW"), "{sql}");
     }
+
+    #[test]
+    fn uniqueidentifier_and_uuid_cross_dialect_equivalence() {
+        assert!(column_types_equal_for_dialects(
+            "uniqueidentifier",
+            "uuid",
+            Some(DialectKind::SqlServer),
+            Some(DialectKind::Postgres),
+        ));
+        assert!(column_types_equal_for_dialects(
+            "uuid",
+            "uniqueidentifier",
+            Some(DialectKind::Postgres),
+            Some(DialectKind::SqlServer),
+        ));
+        assert_eq!(column_type_similarity_score("uniqueidentifier", "uuid"), 1.0);
+        assert_eq!(column_type_similarity_score("uuid", "uniqueidentifier"), 1.0);
+    }
 }