diff --git a/infrastructure/evault-core/src/core/protocol/graphql-server.ts b/infrastructure/evault-core/src/core/protocol/graphql-server.ts
index a8faa752c..f54e059ab 100644
--- a/infrastructure/evault-core/src/core/protocol/graphql-server.ts
+++ b/infrastructure/evault-core/src/core/protocol/graphql-server.ts
@@ -1339,13 +1339,14 @@ export class GraphQLServer {
 
                         const buffer = Buffer.from(base64, "base64");
 
-                        const MAX_FILE_BYTES = 50 * 1024 * 1024; // 50 MB
+                        const MAX_FILE_BYTES = 250 * 1024 * 1024; // 250 MB
                         if (buffer.length > MAX_FILE_BYTES) {
+                            const maxMb = Math.round(MAX_FILE_BYTES / (1024 * 1024));
                             return {
                                 errors: [
                                     {
                                         field: "content",
-                                        message: "File exceeds the 50 MB upload limit",
+                                        message: `File exceeds the ${maxMb} MB upload limit`,
                                         code: "FILE_TOO_LARGE",
                                     },
                                 ],
diff --git a/infrastructure/evault-core/src/index.ts b/infrastructure/evault-core/src/index.ts
index 9cb085d9a..483042feb 100644
--- a/infrastructure/evault-core/src/index.ts
+++ b/infrastructure/evault-core/src/index.ts
@@ -177,7 +177,11 @@ const initializeEVault = async (
 
     fastifyServer = fastify({
         logger: true,
-        bodyLimit: 20 * 1024 * 1024, // 20MB (default is 1MB; needed for createMetaEnvelope etc.)
+        // 350MB. Files are uploaded base64-encoded inside the GraphQL JSON body,
+        // which inflates the raw request ~1.37x, so the body limit must exceed the
+        // base64-encoded size of the largest allowed file (250MB binary ≈ 343MB
+        // base64 + JSON overhead). Keep in sync with MAX_FILE_BYTES in graphql-server.ts.
+        bodyLimit: 350 * 1024 * 1024,
     });
 
     // Register CORS plugin with relaxed settings
diff --git a/infrastructure/evault-core/src/test-utils/e2e-setup.ts b/infrastructure/evault-core/src/test-utils/e2e-setup.ts
index 42efb8f69..2cfa848e5 100644
--- a/infrastructure/evault-core/src/test-utils/e2e-setup.ts
+++ b/infrastructure/evault-core/src/test-utils/e2e-setup.ts
@@ -151,7 +151,7 @@ export async function setupE2ETestServer(
     // Setup Fastify server
     const fastifyServer = fastify({
         logger: false,
-        bodyLimit: 20 * 1024 * 1024, // 20MB, match production limit
+        bodyLimit: 350 * 1024 * 1024, // 350MB, match production limit
     });
     await registerHttpRoutes(fastifyServer, evaultInstance, provisioningService, dbService);
 
diff --git a/platforms/esigner/api/src/controllers/FileController.ts b/platforms/esigner/api/src/controllers/FileController.ts
index c44439996..a224e43fa 100644
--- a/platforms/esigner/api/src/controllers/FileController.ts
+++ b/platforms/esigner/api/src/controllers/FileController.ts
@@ -3,7 +3,7 @@ import { FileService, ReservedFileNameError } from "../services/FileService";
 import multer from "multer";
 import { v4 as uuidv4 } from "uuid";
 
-export const MAX_FILE_SIZE = 20 * 1024 * 1024; // 20MB limit
+export const MAX_FILE_SIZE = 250 * 1024 * 1024; // 250MB limit
 
 const upload = multer({
     limits: { fileSize: MAX_FILE_SIZE },
diff --git a/platforms/esigner/api/src/index.ts b/platforms/esigner/api/src/index.ts
index 2ff0acd39..7eb500988 100644
--- a/platforms/esigner/api/src/index.ts
+++ b/platforms/esigner/api/src/index.ts
@@ -62,8 +62,8 @@ app.use(
         credentials: true,
     }),
 );
-app.use(express.json({ limit: "20mb" }));
-app.use(express.urlencoded({ limit: "20mb", extended: true }));
+app.use(express.json({ limit: "250mb" }));
+app.use(express.urlencoded({ limit: "250mb", extended: true }));
 
 // Controllers
 const authController = new AuthController();
diff --git a/platforms/esigner/client/src/lib/stores/files.ts b/platforms/esigner/client/src/lib/stores/files.ts
index 4b770553a..f545b3dc8 100644
--- a/platforms/esigner/client/src/lib/stores/files.ts
+++ b/platforms/esigner/client/src/lib/stores/files.ts
@@ -68,7 +68,7 @@ export const fetchDocuments = async () => {
 // Keep fetchFiles alias for backward compatibility
 export const fetchFiles = fetchDocuments;
 
-const MAX_FILE_SIZE = 20 * 1024 * 1024; // 20MB limit
+const MAX_FILE_SIZE = 250 * 1024 * 1024; // 250MB limit
 
 export class FileSizeError extends Error {
     constructor(