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

# Remove a tag from a file

> Remove a specific tag from a file.

**Behavior:**
- Removes the specified tag from the document
- Works for both manually assigned and auto-assigned tags
- Idempotent: returns 204 even if tag was not on the document

**Validation:**
- Returns 403 if user doesn't have permission to edit the document
- Returns 404 if document doesn't exist
- Returns 404 if tag doesn't exist or doesn't belong to user's company




## OpenAPI

````yaml /api-reference/api-console.yaml delete /api/v3/files/{id}/tags/{tag_id}
openapi: 3.1.0
info:
  title: LightOn API
  version: 3.9.0 (v1)
  description: >-
    LightOn gives you an API to search, parse, and ingest documents at scale.
    Build knowledge-retrieval pipelines without managing vector databases or OCR
    models.
servers:
  - url: https://api.lighton.ai
security: []
tags:
  - name: Ask
    description: >-
      Retrieval-augmented generation: search your indexed corpus and generate an
      LLM answer grounded in the retrieved passages. Supports streaming (SSE)
      and synchronous modes.
  - name: Search
    description: >-
      Hybrid vector + text retrieval over your indexed corpus. Returns ranked
      passages with provenance (file, page range, workspace). Optional reranking
      and vision mode.
  - name: Files
    description: Upload, list, fetch, and delete documents indexed in your workspaces.
  - name: Facets
    description: >-
      Organise documents with hierarchical content types and custom attributes
      per file. Start from starter templates or build your own classification
      schema from scratch.
  - name: Tags
    description: >-
      Manage flat, company-wide labels used to scope search and group content
      across workspaces.
  - name: Workspaces
    description: >-
      Create and manage workspaces — the access-controlled containers your
      documents live in.
  - name: Parse
    description: >-
      Convert documents into structured Markdown — PDFs, images, Office files,
      and HTML. Synchronous endpoint capped at 20 MB / 15 pages.
  - name: Extract
    description: >-
      Pull typed fields out of documents using a JSON Schema you provide. Sync
      mode for small documents (≤20 MB / 15 pages); async mode for larger jobs
      (≤100 MB / 1000 pages) with polling on a job ID.
  - name: API Keys
    description: >-
      Provision and revoke API keys used to authenticate against the Console
      API.
  - name: Models
    description: >-
      List, register, update, and delete custom ML models scoped to your
      company.
paths:
  /api/v3/files/{id}/tags/{tag_id}:
    delete:
      tags:
        - Files
      summary: Remove a tag from a file
      description: |
        Remove a specific tag from a file.

        **Behavior:**
        - Removes the specified tag from the document
        - Works for both manually assigned and auto-assigned tags
        - Idempotent: returns 204 even if tag was not on the document

        **Validation:**
        - Returns 403 if user doesn't have permission to edit the document
        - Returns 404 if document doesn't exist
        - Returns 404 if tag doesn't exist or doesn't belong to user's company
      operationId: api_v3_files_tags_destroy
      parameters:
        - in: path
          name: id
          schema:
            type: integer
          required: true
        - in: path
          name: tag_id
          schema:
            type: integer
          required: true
      responses:
        '204':
          description: Tag removed successfully (or was already not on the file)
        '401':
          description: Authentication credentials were not provided
        '403':
          description: Permission denied - user cannot edit this file
        '404':
          description: File or tag not found
      security:
        - bearerAuth: []
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        Bearer authentication header of the form `Bearer <token>`, where
        `<token>` is your auth token.

````