diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d6f3b2a75f..b34f8929ee4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -47,6 +47,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added information to export CVAT_HOST when performing local installation for accessing over network (<https://github.com/openvinotoolkit/cvat/pull/4014>)
 - Fixed possible color collisions in the generated colormap (<https://github.com/openvinotoolkit/cvat/pull/4007>)
 - Original pdf file is deleted when using share(<https://github.com/openvinotoolkit/cvat/pull/3967>)
+- Fixed task data upload progressbar(<https://github.com/openvinotoolkit/cvat/pull/4134>)
 
 ### Security
 - Updated ELK to 6.8.22 which uses log4j 2.17.0 (<https://github.com/openvinotoolkit/cvat/pull/4052>)
diff --git a/cvat-core/src/server-proxy.js b/cvat-core/src/server-proxy.js
index ec6e0204db1..40786a634eb 100644
--- a/cvat-core/src/server-proxy.js
+++ b/cvat-core/src/server-proxy.js
@@ -840,8 +840,8 @@
                             },
                             onProgress(bytesUploaded) {
                                 const currentUploadedSize = totalSentSize + bytesUploaded;
-                                const percentage = ((currentUploadedSize / totalSize) * 100).toFixed(2);
-                                onUpdate(`The data are being uploaded to the server ${percentage}%`);
+                                const percentage = currentUploadedSize / totalSize;
+                                onUpdate('The data are being uploaded to the server', percentage);
                             },
                             onSuccess() {
                                 totalSentSize += file.size;
@@ -869,8 +869,8 @@
                         for (const [idx, element] of fileBulks[currentChunkNumber].files.entries()) {
                             taskData.append(`client_files[${idx}]`, element);
                         }
-                        onUpdate(`The data are being uploaded to the server
-                                    ${((totalSentSize / totalSize) * 100).toFixed(2)}%`);
+                        const percentage = totalSentSize / totalSize;
+                        onUpdate('The data are being uploaded to the server', percentage);
                         await Axios.post(`${backendAPI}/tasks/${taskId}/data`, taskData, {
                             ...params,
                             proxy: config.proxy,