docs/source/guide/release_notes/onprem/2.28.0.md
Aug 28, 2025
Helm Chart version: 1.11.1
We’ve introduced a new BitMask tag to support pixel-level image annotation using a brush and eraser. This new tag allows for highly detailed segmentation using brush-based region and a cursor that reflects brush size down to single pixels for fine detail. We’ve also improved performance so it can handle more regions with ease.
Additionally, Mac users can now use two fingers to pinch zoom and pan images for all annotation tasks.
<video style="max-width: 800px;" class="gif-border" autoplay loop muted> <source src="/images/releases/bitmask.mp4"> </video>For more information, see BitmaskLabels.
You can now configure global hotkeys for each user account. These are available from the Account & Settings page.
When using the View All action, users who are in the Reviewer role or higher can now see a summary of the annotations for a specific task. This summary includes metadata, agreements, and side-by-side comparisons of labels.
You can use this summary for a more efficient and detailed review of annotated tasks and to better understand consensus and discrepancies, especially when needing to compare the work of multiple annotators.
We released a new version of the SDK, with multiple functional and documentation enhancements.
!!! warning This release contains breaking changes. If you are currently using the Label Studio SDK package in any automated pipelines, we strongly recommend pinning your SDK version to <2.0.0.
When you are using a labeling configuration that includes <TimelineLabels>, you will now see a settings icon.
From here you can specify the following:
Previously, the bulk annotation actions were only available to users in the Reviewer role or Manager and higher.
Now, users in the Annotator role can access these action.
Note that this is only available when the project is using Manual distribution and annotators must have access to the Data Manager.
You now have the option to view the Projects page in list format rather than as a grid of cards:
In the list view, you see will a condensed version of the project information that includes fewer metrics, but more projects per page:
(Admin view)
(Annotator view)
This change also includes a new option to sort projects (available in either view):
You can also now search by project description and project ID.
There have been several improvements to the workspace list:
When using an OpenAI API key, you will now see the following models as options:
gpt-5
gpt-5-mini
gpt-5-nano
The Organization > Usage & License page has new options to disable individual email notifications for all members in the organization.
If disabled, the notification will be disabled for all users and hidden from their options on their Account & Settings page.
There is a new option on the Members page to export Annotation Summary data to CSV:
You can now annotate time series data on the sub-second decimal level.
!!! note
Your time format must include `.%f` to support decimals. For example:
`timeFormat="%Y-%m-%d %H:%M:%S.%f"`
The <Rectangle> and <RectangleLabels> tags now include the snap parameter, allowing you to snap bounding boxes to pixels.
!!! info tip
To see a pixel grid when zoomed in on an image, you must disable pixel smoothing. This can be done as a parameter on the <Image> tag or from the user settings.
The <Collapse> tag now includes an open parameter. You can use this to specify whether a content area should be open or collapsed by default.
There is a new spectrogram parameter for the <Audio> tag, allowing you to show spectrograms by default
include and filter fields for the project list APIThe List all projects call has been updated with include and filter parameters.
When listing organization members via the API, you can use two new query params to exclude project or workspace members:
exclude_project_id
exclude_workspace_id
Removed the default zoom level calculation for Audio, allowing it to render the full waveform by default.
The Add Source Storage modal has been improved for clarity.
UX improvements for labeling interface information panels.
Ask AI is now on by default for all new accounts.
Email notifications are now opt-in for existing user accounts
Improved error handling and data persistence when saving annotations and reviews.
Improved error messages when data import fails.
Improved status visibility when duplicating projects.
/api/projects/{project_id}/export is deprecated
Page size on /api/projects API is now limited to 100 projects
Fixed a Koa.js XSS vulnerability tied to a redirect function.
Added improved password validation.
/api/tasks endpoint timed out with a large number of annotations.Timeseries when used with the MultiChannel tag.TimeSeries using the TimeSeriesVisualizer component caused problems.page parameter was not reset to 1 when navigating to All Projects.