diff --git a/gns3server/compute/base_manager.py b/gns3server/compute/base_manager.py
index 392e595d..4cbe6f00 100644
--- a/gns3server/compute/base_manager.py
+++ b/gns3server/compute/base_manager.py
@@ -483,7 +483,9 @@ class BaseManager:
                     path = os.path.relpath(os.path.join(root, filename), img_dir)
                     images.append({
                         "filename": filename,
-                        "path": path})
+                        "path": path,
+                        "md5sum": md5sum(os.path.join(root, filename)),
+                        "filesize": os.stat(os.path.join(root, filename)).st_size})
         return images
 
     def get_images_directory(self):
@@ -507,7 +509,7 @@ class BaseManager:
             os.makedirs(os.path.dirname(path), exist_ok=True)
             with open(tmp_path, 'wb+') as f:
                 while True:
-                    packet = yield from stream.read(512)
+                    packet = yield from stream.read(4096)
                     if not packet:
                         break
                     f.write(packet)
diff --git a/gns3server/compute/dynamips/__init__.py b/gns3server/compute/dynamips/__init__.py
index 4ac75819..36f98008 100644
--- a/gns3server/compute/dynamips/__init__.py
+++ b/gns3server/compute/dynamips/__init__.py
@@ -33,6 +33,7 @@ import glob
 log = logging.getLogger(__name__)
 
 from gns3server.utils.interfaces import interfaces, is_interface_up
+from gns3server.utils.images import md5sum
 from gns3server.utils.asyncio import wait_run_in_executor
 from gns3server.utils import parse_version
 from uuid import UUID, uuid4
@@ -712,6 +713,9 @@ class Dynamips(BaseManager):
                     continue
                 # valid IOS images must start with the ELF magic number, be 32-bit, big endian and have an ELF version of 1
                 if elf_header_start == b'\x7fELF\x01\x02\x01':
-                    path = os.path.relpath(path, image_dir)
-                    images.append({"filename": filename, "path": path})
+                    images.append({"filename": filename,
+                                   "path": os.path.relpath(path, image_dir),
+                                   "md5sum": md5sum(path),
+                                   "filesize": os.stat(path).st_size
+                                   })
         return images
diff --git a/gns3server/controller/compute.py b/gns3server/controller/compute.py
index 7a2873dc..fd1a7ebd 100644
--- a/gns3server/controller/compute.py
+++ b/gns3server/controller/compute.py
@@ -26,7 +26,7 @@ import os
 import io
 
 from ..utils import parse_version
-from ..utils.images import scan_for_images
+from ..utils.images import scan_for_images, md5sum
 from ..controller.controller_error import ControllerError
 from ..config import Config
 from ..version import __version__
@@ -446,7 +446,7 @@ class Compute:
 
                     def send_data(f):
                         while True:
-                            chunk = f.read(1024)
+                            chunk = f.read(4096)
                             if not chunk:
                                 break
                             yield chunk
@@ -543,7 +543,11 @@ class Compute:
             for path in scan_for_images(type):
                 image = os.path.basename(path)
                 if image not in [i['filename'] for i in images]:
-                    images.append({"filename": image, "path": image})
+                    images.append({"filename": image,
+                                   "path": image,
+                                   "md5sum": md5sum(path),
+                                   "filesize": os.stat(path).st_size
+                                   })
         return images
 
     @asyncio.coroutine
diff --git a/gns3server/schemas/node.py b/gns3server/schemas/node.py
index 405bb9ff..91ebd719 100644
--- a/gns3server/schemas/node.py
+++ b/gns3server/schemas/node.py
@@ -53,6 +53,16 @@ NODE_LIST_IMAGES_SCHEMA = {
                     "description": "Image path",
                     "type": "string",
                     "minLength": 1
+                },
+                "md5sum": {
+                    "description": "md5sum of the image if available",
+                    "type": ["string", "null"],
+                    "minLength": 1
+                },
+                "filesize": {
+                    "description": "size of the image if available",
+                    "type": ["integer", "null"],
+                    "minimum": 0
                 }
             },
             "required": ["filename", "path"],
diff --git a/gns3server/utils/images.py b/gns3server/utils/images.py
index c58a263c..ce64fe40 100644
--- a/gns3server/utils/images.py
+++ b/gns3server/utils/images.py
@@ -92,7 +92,9 @@ def md5sum(path):
 
     try:
         with open(path + '.md5sum') as f:
-            return f.read()
+            md5 = f.read()
+            if len(md5) == 32:
+                return md5
     # Unicode error is when user rename an image to .md5sum ....
     except (OSError, UnicodeDecodeError):
         pass
diff --git a/tests/compute/test_manager.py b/tests/compute/test_manager.py
index 647d63ce..4ff2df7f 100644
--- a/tests/compute/test_manager.py
+++ b/tests/compute/test_manager.py
@@ -226,8 +226,8 @@ def test_list_images(loop, qemu, tmpdir):
 
     with patch("gns3server.compute.Qemu.get_images_directory", return_value=str(tmpdir)):
         assert loop.run_until_complete(qemu.list_images()) == [
-            {"filename": "a.bin", "path": "a.bin"},
-            {"filename": "b.bin", "path": "b.bin"}
+            {"filename": "a.bin", "path": "a.bin", "md5sum": "c4ca4238a0b923820dcc509a6f75849b", "filesize": 1},
+            {"filename": "b.bin", "path": "b.bin", "md5sum": "c4ca4238a0b923820dcc509a6f75849b", "filesize": 1}
         ]
 
 
@@ -245,9 +245,9 @@ def test_list_images_recursives(loop, qemu, tmpdir):
 
     with patch("gns3server.compute.Qemu.get_images_directory", return_value=str(tmpdir)):
         assert loop.run_until_complete(qemu.list_images()) == [
-            {"filename": "a.bin", "path": "a.bin"},
-            {"filename": "b.bin", "path": "b.bin"},
-            {"filename": "c.bin", "path": os.path.sep.join(["c", "c.bin"])}
+            {"filename": "a.bin", "path": "a.bin", "md5sum": "c4ca4238a0b923820dcc509a6f75849b", "filesize": 1},
+            {"filename": "b.bin", "path": "b.bin", "md5sum": "c4ca4238a0b923820dcc509a6f75849b", "filesize": 1},
+            {"filename": "c.bin", "path": os.path.sep.join(["c", "c.bin"]), "md5sum": "c4ca4238a0b923820dcc509a6f75849b", "filesize": 1}
         ]
 
 
diff --git a/tests/controller/test_compute.py b/tests/controller/test_compute.py
index bad0e6c4..24328ba2 100644
--- a/tests/controller/test_compute.py
+++ b/tests/controller/test_compute.py
@@ -350,13 +350,18 @@ def test_images(compute, async_run, images_dir):
     """
     response = MagicMock()
     response.status = 200
-    response.read = AsyncioMagicMock(return_value=json.dumps([{"filename": "linux.qcow2", "path": "linux.qcow2"}]).encode())
+    response.read = AsyncioMagicMock(return_value=json.dumps([{
+        "filename": "linux.qcow2",
+        "path": "linux.qcow2",
+        "md5sum": "d41d8cd98f00b204e9800998ecf8427e",
+        "filesize": 0}]).encode())
     open(os.path.join(images_dir, "asa.qcow2"), "w+").close()
     with asyncio_patch("aiohttp.ClientSession.request", return_value=response) as mock:
         images = async_run(compute.images("qemu"))
         mock.assert_called_with("GET", "https://example.com:84/v2/compute/qemu/images", auth=None, data=None, headers={'content-type': 'application/json'}, chunked=False)
 
-    assert images == [{"filename": "linux.qcow2", "path": "linux.qcow2"}, {"filename": "asa.qcow2", "path": "asa.qcow2"}]
+    assert images == [{"filename": "linux.qcow2", "path": "linux.qcow2", "md5sum": "d41d8cd98f00b204e9800998ecf8427e", "filesize": 0},
+                      {"filename": "asa.qcow2", "path": "asa.qcow2", "md5sum": "d41d8cd98f00b204e9800998ecf8427e", "filesize": 0}]
 
 
 def test_list_files(project, async_run, compute):
diff --git a/tests/handlers/api/compute/test_dynamips.py b/tests/handlers/api/compute/test_dynamips.py
index 30654c37..c7666fad 100644
--- a/tests/handlers/api/compute/test_dynamips.py
+++ b/tests/handlers/api/compute/test_dynamips.py
@@ -156,7 +156,11 @@ def test_images(http_compute, tmpdir, fake_dynamips, fake_file):
     with patch("gns3server.compute.Dynamips.get_images_directory", return_value=str(tmpdir), example=True):
         response = http_compute.get("/dynamips/images")
     assert response.status == 200
-    assert response.json == [{"filename": "7200.bin", "path": "7200.bin"}]
+    assert response.json == [{"filename": "7200.bin",
+                              "path": "7200.bin",
+                              "filesize": 7,
+                              "md5sum": "b0d5aa897d937aced5a6b1046e8f7e2e"
+                              }]
 
 
 def test_upload_image(http_compute, tmpdir):
diff --git a/tests/handlers/api/compute/test_iou.py b/tests/handlers/api/compute/test_iou.py
index c0a1537f..16c344e3 100644
--- a/tests/handlers/api/compute/test_iou.py
+++ b/tests/handlers/api/compute/test_iou.py
@@ -307,7 +307,7 @@ def test_images(http_compute, fake_iou_bin):
 
     response = http_compute.get("/iou/images", example=True)
     assert response.status == 200
-    assert response.json == [{"filename": "iou.bin", "path": "iou.bin"}]
+    assert response.json == [{"filename": "iou.bin", "path": "iou.bin", "filesize": 7, "md5sum": "e573e8f5c93c6c00783f20c7a170aa6c"}]
 
 
 def test_image_vm(http_compute, tmpdir):
diff --git a/tests/handlers/api/compute/test_qemu.py b/tests/handlers/api/compute/test_qemu.py
index 2f00c2b2..ec61dea7 100644
--- a/tests/handlers/api/compute/test_qemu.py
+++ b/tests/handlers/api/compute/test_qemu.py
@@ -226,7 +226,7 @@ def test_images(http_compute, tmpdir, fake_qemu_vm):
 
     response = http_compute.get("/qemu/images")
     assert response.status == 200
-    assert response.json == [{"filename": "linux载.img", "path": "linux载.img"}]
+    assert response.json == [{"filename": "linux载.img", "path": "linux载.img", "md5sum": "c4ca4238a0b923820dcc509a6f75849b", "filesize": 1}]
 
 
 def test_upload_image(http_compute, tmpdir):