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documentation/content/en/methods/statuses/media.md

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title description menu
media Attach media to authored statuses. See Using Mastodon > Posting toots > Attachments for more information about size and format limits.
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10 methods-statuses

{{< api-method method="post" host="https://mastodon.example" path="/api/v1/media" title="Upload media as attachment" >}} {{< api-method-description >}}

Creates an attachment to be used with a new status.

Returns: Attachment
OAuth: User token + write:media
Version history:

  • 0.0.0 - added
  • 2.3.0 - add focus parameter

{{< endapi-method-description >}} {{< api-method-spec >}} {{< api-method-request >}} {{< api-method-headers >}} {{< api-method-parameter name="Authorization" type="string" required=true >}} Bearer <user token> {{< endapi-method-parameter >}} {{< endapi-method-headers >}} {{< api-method-form-data-parameters >}} {{< api-method-parameter name="file" type="object" required=true >}} The file to be attached, using multipart form data. {{< endapi-method-parameter >}} {{< api-method-parameter name="description" type="string" required=false >}} A plain-text description of the media, for accessibility purposes. {{< endapi-method-parameter >}} {{< api-method-parameter name="focus" type="string" required=false >}} Two floating points x,y, comma-delimited, ranging from -1.0 to 1.0 {{< endapi-method-parameter >}} {{< endapi-method-form-data-parameters >}} {{< endapi-method-request >}} {{< api-method-response >}} {{< api-method-response-example httpCode=200 >}} {{< api-method-response-example-description >}}

Attachment created successfully. Note that the Attachment will be created even if the file is not understood correctly. {{< endapi-method-response-example-description >}}

{{< tabs >}} {{< tab title="file correct" >}}

{
  "id": "22348641",
  "type": "image",
  "url": "https://files.mastodon.social/media_attachments/files/022/348/641/original/cebc6d51be03e509.jpeg",
  "preview_url": "https://files.mastodon.social/media_attachments/files/022/348/641/small/cebc6d51be03e509.jpeg",
  "remote_url": null,
  "text_url": "https://mastodon.social/media/4Zj6ewxzzzDi0g8JnZQ",
  "meta": {
    "focus": {
      "x": -0.69,
      "y": 0.42
    },
    "original": {
      "width": 640,
      "height": 480,
      "size": "640x480",
      "aspect": 1.3333333333333333
    },
    "small": {
      "width": 461,
      "height": 346,
      "size": "461x346",
      "aspect": 1.3323699421965318
    }
  },
  "description": "test uploaded via api",
  "blurhash": "UFBWY:8_0Jxv4mx]t8t64.%M-:IUWGWAt6M}"
}

{{< endtab >}}

{{< tab title="file not correct" >}}

{
  "id": "22348456",
  "type": "unknown",
  "url": "https://mastodon.social/files/original/missing.png",
  "preview_url": "https://mastodon.social/files/small/missing.png",
  "remote_url": null,
  "text_url": "https://mastodon.social/media/Ao2nvQoQNHROpKgEyoA",
  "meta": {
    "focus": {
      "x": -0.69,
      "y": 0.42
    }
  },
  "description": "test uploaded via api",
  "blurhash": null
}

{{< endtab >}} {{< endtabs >}} {{< endapi-method-response-example >}} {{< api-method-response-example httpCode=401 >}} {{< api-method-response-example-description >}}

Invalid or missing Authorization header {{< endapi-method-response-example-description >}}

{
  "error": "The access token is invalid"
}

{{< endapi-method-response-example >}} {{< api-method-response-example httpCode=422 >}} {{< api-method-response-example-description >}}

File or file type is unsupported or invalid {{< endapi-method-response-example-description >}}

{
  "error": "Validation failed: File content type is invalid, File is invalid"
}

{{< endapi-method-response-example >}} {{< endapi-method-response >}} {{< endapi-method-spec >}} {{< endapi-method >}} {{< api-method method="put" host="https://mastodon.example" path="/api/v1/media/:id" title="Update attachment" >}} {{< api-method-description >}}

Update an Attachment, before it is attached to a status and posted.

Returns: Attachment
OAuth: User token + write:media
Version history:

  • 0.0.0 - added

{{< endapi-method-description >}} {{< api-method-spec >}} {{< api-method-request >}} {{< api-method-path-parameters >}} {{< api-method-parameter name=":id" type="string" required=true >}} The id of the Attachment entity to be updated {{< endapi-method-parameter >}} {{< endapi-method-path-parameters >}} {{< api-method-headers >}} {{< api-method-parameter name="Authorization" type="string" required=true >}} Bearer <user token> {{< endapi-method-parameter >}} {{< endapi-method-headers >}} {{< api-method-form-data-parameters >}} {{< api-method-parameter name="file" type="object" required=false >}} The file to be attached, using multipart form data. {{< endapi-method-parameter >}} {{< api-method-parameter name="description" type="string" required=false >}} A plain-text description of the media, for accessibility purposes. {{< endapi-method-parameter >}} {{< api-method-parameter name="focus" type="string" required=false >}} Two floating points x,y, comma-delimited ranging from -1.0 to 1.0 {{< endapi-method-parameter >}} {{< endapi-method-form-data-parameters >}} {{< endapi-method-request >}} {{< api-method-response >}} {{< api-method-response-example httpCode=200 >}} {{< api-method-response-example-description >}} {{< endapi-method-response-example-description >}}

{
  "id": "22348641",
  "type": "image",
  "url": "https://files.mastodon.social/media_attachments/files/022/348/641/original/e96382f26c72a29c.jpeg",
  "preview_url": "https://files.mastodon.social/media_attachments/files/022/348/641/small/e96382f26c72a29c.jpeg",
  "remote_url": null,
  "text_url": "https://mastodon.social/media/4Zj6ewxzzzDi0g8JnZQ",
  "meta": {
    "focus": {
      "x": -0.42,
      "y": 0.69
    },
    "original": {
      "width": 640,
      "height": 480,
      "size": "640x480",
      "aspect": 1.3333333333333333
    },
    "small": {
      "width": 461,
      "height": 346,
      "size": "461x346",
      "aspect": 1.3323699421965318
    }
  },
  "description": "test uploaded via api, but updated",
  "blurhash": "UFBWY:8_0Jxv4mx]t8t64.%M-:IUWGWAt6M}"
}

{{< endapi-method-response-example >}} {{< api-method-response-example httpCode=401 >}} {{< api-method-response-example-description >}}

Invalid or missing Authorization header {{< endapi-method-response-example-description >}}

{
  "error": "The access token is invalid"
}

{{< endapi-method-response-example >}} {{< api-method-response-example httpCode=404 >}} {{< api-method-response-example-description >}}

Attachment does not exist, is deleted, or was not created by you {{< endapi-method-response-example-description >}}

{
  "error": "Record not found"
}

{{< endapi-method-response-example >}} {{< api-method-response-example httpCode=422 >}} {{< api-method-response-example-description >}}

File or file type is unsupported or invalid {{< endapi-method-response-example-description >}}

{
  "error": "Validation failed: File content type is invalid, File is invalid"
}

{{< endapi-method-response-example >}} {{< endapi-method-response >}} {{< endapi-method-spec >}} {{< endapi-method >}}

Focal points

Server-side preview images are never cropped, to support a variety of apps and user interfaces. Therefore, the cropping must be done by those apps. To crop intelligently, focal points can be used to ensure a certain section of the image is always within the cropped viewport. See this guide on how focal points are defined. In summary, floating points range from -1.0 to 1.0, left-to-right or bottom-to-top. 0,0 is the center of the image. 0.5, 0.5 would be in the center of the upper-right quadrant. -0.5, -0.5 would be in the center of the lower-left quadrant. For reference, thumbnails in the Mastodon frontend are most commonly 16:9.

{{< figure src="..//assets/image%20%2856%29.png" caption="A demonstration of various focal points and their coordinates." >}} {{< figure src="..//assets/image%20%2856%29.png" caption="A demonstration of various focal points and their coordinates." >}}