Guidelines for optimal performance

While the Encord platform is able to handle large volumes of data, we strongly recommend working within the following limits to ensure smooth operations and limit loading times.



Please see our Supported data page for detailed information for all supported data and file types, as well as addressing any data related issues such as long buffering times



The limits outlined below apply whether you're using the SDK, or the web-app.


Maximum number of data units5,0002,5001000
Maximum image/video/DICOM file size1 GB1 GB500 MB
Maximum JSON file size100 MB100 MB10 MB
Label row / Annotation task limit50 MB50 MB10 MB
Model predictions import limit50 MB50 MB10 MB
Maximum resolution4K (3840 x 2160 px)4K (3840 x 2160 px)4K (3840 x 2160 px)
Number of frames per video200,000 (2hrs at 30fps)200,000 (2hrs at 30fps)200,000 (2hrs at 30fps)

When a project is too large, the files in the attached dataset(s) need to be resized, as shown below.



Learn how to resize your videos here.


Maximum number of projectsUnlimitedUnlimited10
Maximum dataset size per project100 GB100 GB100 GB
Maximum number of labels per project1,000,0001,000,0001,000,000
Maximum number of instances per project10,0005,0005,000
Maximum number of tasks per project5,0002,5001,000

Encord Active

Maximum number of images500,00050,00050,000


Maximum number of usersUnlimitedUnlimited1



Even if you stay within these limits, we recommend to create a new project every 6 months and archive the existing project

Screen size

Encord isn't supported on small screens such as tablets. The minimum application window resolution needs to be 800x600px.

Recommended browser

We strongly encourage the use of Chromium-based browsers (e.g. Google Chrome, Brave, Edge) when using Encord. Our team conducts all development & testing using Google Chrome.

This is primarily due to optimizing performance & ensuring data integrity. Modern browsers give no control over deterministically rendering media files (e.g., displaying frames and rendering videos). Further, we also recommend turning off hardware acceleration in Chrome.

Hardware acceleration adds another layer of uncertainty to video rendering in the browser. To eliminate unexpected behavior, we strongly recommend disabling hardware acceleration.



If you have any questions on the above or are experiencing performance issues please contact us at [email protected]

Data formats

Video formats

We support a range of formats and codecs. For optimized performance we recommend using the following video formats:

  • .mp4 file with h.264
  • .mp4 with vp9

Please ensure that videos have a constant frame rate and no audio tracks. The label editor will inform you when we detect audio present in the video files. You can remove audio tracks in videos already in the Encord platform by using the media re-encoding feature in our platform, detailed here.

Other formats and codecs may be supported, but we cannot guarantee compatibility, for more information please see our blog or relevant section in our documentation.

Image formats

The platform supports a range of image formats. For most cases we recommend to use:

  • .png
  • .jpeg

For more information please see the relevant section in our documentation.

Resolution of data / media

The resolution of any videos and images should be limited to 4k pixels (3840 x 2160 px) to avoid issues. If you have other requirements, please contact us first and we will help evaluate suitability for specific use-cases.

Keyboard shortcuts

Be sure to check out all the keyboard shortcuts available when using the label editor, to help speed up your annotations!