diff --git a/apps/edr-freight-api/src/common/dto/page-size-cap.spec.ts b/apps/edr-freight-api/src/common/dto/page-size-cap.spec.ts
new file mode 100644
index 000000000..574fa0ae6
--- /dev/null
+++ b/apps/edr-freight-api/src/common/dto/page-size-cap.spec.ts
@@ -0,0 +1,32 @@
+import { plainToInstance } from 'class-transformer';
+import { validateSync } from 'class-validator';
+
+import { PaginationQueryDto } from './pagination-query.dto';
+import { ListWagonsQueryDto } from '../../modules/wagons/dto/list-wagons-query.dto';
+import { normalizePagination } from '../utils/pagination.util';
+
+/**
+ * The page-size ceiling is stated in three places that must agree: `@Max` on
+ * PaginationQueryDto, the same `@Max` repeated on ListWagonsQueryDto (which
+ * doesn't extend it), and `MAX_PAGE_SIZE` in pagination.util. A fourth copy
+ * lives outside this package — `MAX_PAGE_SIZE` in @edr/ui-common's data-table
+ * footer, which is what actually asks for the number. Drift between any of
+ * them shows up as a 400 on the largest rows-per-page option, so pin them.
+ */
+const errorsFor = (cls: any, pageSize: unknown) =>
+  validateSync(plainToInstance(cls, { pageSize }), { whitelist: false });
+
+describe('page size ceiling', () => {
+  it.each([PaginationQueryDto, ListWagonsQueryDto])('accepts 500 on %p', (cls) => {
+    expect(errorsFor(cls, 500)).toHaveLength(0);
+  });
+
+  it.each([PaginationQueryDto, ListWagonsQueryDto])('rejects 501 on %p', (cls) => {
+    expect(errorsFor(cls, 501)).not.toHaveLength(0);
+  });
+
+  it('does not truncate 500 in the service-side clamp', () => {
+    expect(normalizePagination({ page: 1, pageSize: 500 }).take).toBe(500);
+    expect(normalizePagination({ page: 1, pageSize: 501 }).take).toBe(500);
+  });
+});
diff --git a/apps/edr-freight-api/src/common/dto/pagination-query.dto.ts b/apps/edr-freight-api/src/common/dto/pagination-query.dto.ts
index e705b019d..be04dadba 100644
--- a/apps/edr-freight-api/src/common/dto/pagination-query.dto.ts
+++ b/apps/edr-freight-api/src/common/dto/pagination-query.dto.ts
@@ -19,12 +19,18 @@ export class PaginationQueryDto {
   @Min(1)
   page?: number;
 
-  @ApiPropertyOptional({ default: 20, minimum: 1, maximum: 100 })
+  /**
+   * Ceiling is 500, matching `MAX_PAGE_SIZE` in `common/utils/pagination.util.ts`
+   * and the backoffice table footer's largest option. The three have to agree:
+   * a lower value here turns the footer's top preset into a 400, a higher one
+   * lets a request through that the util then silently truncates.
+   */
+  @ApiPropertyOptional({ default: 20, minimum: 1, maximum: 500 })
   @IsOptional()
   @Transform(({ value }) => parseInt(String(value), 10) || 20)
   @IsInt()
   @Min(1)
-  @Max(100)
+  @Max(500)
   pageSize?: number;
 
   @ApiPropertyOptional({
diff --git a/apps/edr-freight-api/src/common/utils/pagination.util.ts b/apps/edr-freight-api/src/common/utils/pagination.util.ts
index ca4ed35a1..c7097dde7 100644
--- a/apps/edr-freight-api/src/common/utils/pagination.util.ts
+++ b/apps/edr-freight-api/src/common/utils/pagination.util.ts
@@ -20,7 +20,12 @@ export interface NormalizedPage {
 }
 
 const DEFAULT_PAGE_SIZE = 20;
-const MAX_PAGE_SIZE = 100;
+/**
+ * Must stay in step with `@Max` on `PaginationQueryDto.pageSize` and with
+ * `MAX_PAGE_SIZE` in the backoffice's data-table footer — the DTO rejects,
+ * this clamps, and the footer is what actually asks for the number.
+ */
+const MAX_PAGE_SIZE = 500;
 
 /** Clamp raw query values into a safe page window (page ≥ 1, pageSize capped). */
 export function normalizePagination(
diff --git a/apps/edr-freight-api/src/modules/wagons/dto/list-wagons-query.dto.ts b/apps/edr-freight-api/src/modules/wagons/dto/list-wagons-query.dto.ts
index 328a6eaa8..4f48c2a8b 100644
--- a/apps/edr-freight-api/src/modules/wagons/dto/list-wagons-query.dto.ts
+++ b/apps/edr-freight-api/src/modules/wagons/dto/list-wagons-query.dto.ts
@@ -72,12 +72,14 @@ export class ListWagonsQueryDto {
   @Min(1)
   page?: number;
 
-  @ApiPropertyOptional({ default: 10, minimum: 1, maximum: 100 })
+  // 500 to match PaginationQueryDto — this DTO doesn't extend it, so the
+  // ceiling has to be repeated here or the wagons list alone rejects at 100.
+  @ApiPropertyOptional({ default: 10, minimum: 1, maximum: 500 })
   @IsOptional()
   @Type(() => Number)
   @IsInt()
   @Min(1)
-  @Max(100)
+  @Max(500)
   pageSize?: number;
 
   @ApiPropertyOptional({ description: 'Registered on or after this day (YYYY-MM-DD)' })