---
title: "Requirements and Specifications"
slug: "requirements-and-specifications"
updated: 2026-06-24T04:47:58Z
published: 2026-06-24T04:47:58Z
canonical: "docs.dataloop.ai/requirements-and-specifications"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dataloop.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Requirements and Specifications

This page provides insights into the requirements and specifications necessary for utilizing the different functionalities of the DDOE platform.

## Requirements

### Recommended PC/Workstation

Ensure smooth performance by using a workstation that meets the following recommended specifications:

| Type | Recommended |
| --- | --- |
| RAM | 8GB |
| CPU | Intel(R) Pentium(R)3805@ 1.90GHz x 2 Processor 64 bit |
| Screen resolution | 1920 x 1080 |
| Internet connection | Speed test: Download:18.61 Mbps / Upload: 15.68 Mbps / Ping: 31 ms |

### Browser Requirements

Access the DDOE console using one of the supported browsers. We recommend using **Google Chrome** for the best experience:

| Supported Browser | Minimum Version |
| --- | --- |
| Chrome | 47 |
| Safari | 9 |
| Firefox | 45 |
| Opera | 36 |
| Edge | 12 |

> [!WARNING]
> Support
> 
> If you encounter issues using the web interface with any of the listed browsers, please contact [Dataloop Support](https://dataloop.ai/salesforce-form/).

---

## Specifications

### Recipe and Ontology

Configure ontologies and labels efficiently within these recommended limits:

| Type | Recommended |
| --- | --- |
| Labels | 400 labels per ontology |
| Attributes | 100 attributes per ontology |

### Data Management

Ensure dataset scalability and performance with the following limitations:

| Type | Limit |
| --- | --- |
| Annotation label | **1024** chars |
| Annotation attributes | Max **100** per annotation |
| Annotations in joined queries | Maximum **7,000,000** items |
| Items in the Dataset | Maximum **25,000,000** items |
| Item JSON file size | Maximum **100** KB |
| Item filename (full path including dirs) | **1024** chars |
| Maximum items allowed when cloning a dataset via UI | **50,000** items |
| Maximum download file size from the platform | **2** GB |
| Schema enforcement in Dataset | When **schema enforcement** is enabled on a dataset, DDOE requires that each metadata key (path) maintains a **consistent data type** across all items. For example, if `metadata.user.device_id` is initially set as a string (e.g., `"cam_01"`), you must not assign a different type such as an integer (e.g., `123`) to the same key elsewhere in the dataset. |
| Search size per each search key/value | **1024** Bytes |
| Unique custom metadata keys on items in dataset | - **Searchable keys**: Maximum is **100** searchable keys per dataset under `metadata.user`. To add more keys and make them unsearchable, refer to the [Unsearchable Metadata](/1-3-8/docs/organize-your-data#🕵️‍♂️-unsearchable-metadata) article. - **Unsearchable keys**: Maximum of 200 searchable keys per dataset |

### Queries Limitations

Understand system constraints when constructing queries:

| Query | Limit |
| --- | --- |
| Maximum total filter terms in a query | **20** terms |
| Maximum custom metadata filter terms in a query | **10** terms |
| Max sort terms in a query | **3** terms |
| Sorting over custom metadata | **0** term |
| Filter by annotation Metadata | Not supported |
| Arrays | Unsearchable |

> [!NOTE]
> Notice
> 
> - DDOE permits the storage and querying of over 25,000,000 items and unlimited annotations in a dataset, However, join queries between items and annotations are limited to searching over max 7M annotations.
> - A **Term** refers to an individual element or condition used in the query to filter, sort, or search for data. Each term typically represents a distinct criterion or parameter that helps refine the results of a query.

### Types of Metadata in DDOE

#### System Metadata

- Created automatically by DDOE.
- Examples: `id`, `filename`, `datasetId`, `createdAt`, `annotationsCount`.
- **Searchable:** ✅ Yes

#### Custom Metadata

- User-defined key–value pairs added to items or annotations.
- **Supported data types:**

| Type | Searchable |
| --- | --- |
| **String** | ✅ Yes |
| **Number** | ✅ Yes |
| **Boolean** | ✅ Yes |
| **Object** | ✅ Yes (flattened to dot notation, nested primitive values are searchable) |
| **Array** | ❌ No (converted to unsearchable metadata) |

- Custom metadata constraints:
  - Max **100** keys
  - Max **1024** char key length
  - Max **200** unsearchable paths

#### Annotation Metadata

- Extra info added to annotations (e.g. `confidence`, `reviewed`, `notes`).
- **Searchable:** ❌ No (can’t be used in item filters)

#### Dataset / Folder Metadata

- Used to tag datasets or folders (e.g. `version`, `domain`, `type`).
- **Searchable:** ✅ Yes

Learn more about the [data limitations](/1-3-8/docs/specifications#data-management).

### Supported File Formats

DDOE supports a wide range of file formats across domains to ensure flexible and scalable annotation workflows.

| Type | Recommended |
| --- | --- |
| **Image** | JPG, JPEG, PNG, and TIFF |
| **Video** | WEBM, MP4, and MOV |
| **Audio** | WAV, MP3, OGG, FLAC, M4A, and AAC |
| **Lidar** | PCD (ASCII format with a size limit of 70 MB) |
| **NLP / NER** | TXT, JSON, EML, and PDF |
| **GIS** | COG, GeoTIFF, OSM, and XYZ |

> [!NOTE]
> Notice
> 
> - **Audio Studio**: Convert FLAC to MP3 to reduce file size without significant quality loss.
> - **Video Studio**:WEBM is the default format for video annotation. For more information, see the [WEBM](https://docs.dataloop.ai/docs/webm-and-frame-accurate-annotation#webm) article.
> - **MP4 Limitations**: SAR/DAR encoding values are not supported in MP4 files.

### Image Item

Define optimal conditions for image annotation:

| Type | Recommended |
| --- | --- |
| **Size** | 15 MB |
| **Formats** | Refer to the Supported File Formats section. |
| **Resolution** | 24.0 MP |
| **Total annotations** | 1,000 |

> [!WARNING]
> Important
> 
> Valid EXIF values are 1 to 8. Values outside this range (for example, 0) are ignored. Read more about Exif orientation values.

### Audio Item

Best practices for audio file handling and annotation:

| Type | Recommended |
| --- | --- |
| **Annotations** | Up to 300 |
| **Recommended format** | Refer to the Supported File Formats section. |
| **Recommended audio size** | Up to 100 MB |

> [!WARNING]
> Important
> 
> File size depends on **bitrate, compression, and encoding**, not just duration. A 17-minute file can be larger than a 1-hour file if encoded with higher fidelity.

### Video Item

Guidelines for working with video files in annotation projects:

| Type | Recommended |
| --- | --- |
| **Recommended format** | Refer to the Supported File Formats section. |
| **Recommended max video size** | 150 MB |
| **Total annotations** | Up to 400 |

### Task

Control and optimize task assignment across annotation workflows:

| Type | Recommended |
| --- | --- |
| Maximum unworked items per task (without Status) | 80,000 |
| Maximum assignees per task | 1,000 |
| Maximum tasks per project | 5,000 |

### Assignment Limits

Define assignment structure within large-scale tasks:

| Type | Recommended |
| --- | --- |
| Maximum items per single assignment | 10,000 |

### Annotation Studio

Annotation Studio supports advanced visualization and configuration:

| Type | Definition | Recommended |
| --- | --- | --- |
| **Multi-Modality layers** | Combine multiple data types (e.g., image + text + metadata) in a single view. | 8 |
| **Similarity items** | Used for similarity evaluation workflows (e.g., GenAI outputs). | 8 |
| **Multi-view items** | Visualize multiple perspectives or sequential data layers for richer context. | 6 |