> For the complete documentation index, see [llms.txt](https://help.contouron.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.contouron.com/api/post/media-requirements.md).

# Media Requirements

> For the complete documentation index, see [llms.txt](https://help.contouron.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.contouron.com/api/publish-post/media.md).

## Media Requirements

### Twitter

#### General Guidelines

* **Max Character Length**: For regular accounts the character limit is 280 characters. For Premium accounts the character limit is 25,000 characters.
* **Media Attachments per Tweet**: You can attach up to 4 photos, 1 animated GIF, or 1 video in a single Tweet.
* If you see a 429 error from Twitter, you are posting too much. Twitter has a per user limit of 100 requests per 24 hours.

#### Image Specifications

* **Supported Formats**: JPG, PNG, GIF, WEBP
* **File Size Limit**: Images must be ≤ 5 MB; animated GIFs must be ≤ 15 MB.
* **Animated GIF Recommendations**:

  * **Resolution**: ≤ 1280x1080 pixels
  * **Frame Count**: ≤ 350 frames
  * **Total Pixels**: Width × Height × Number of Frames ≤ 300 million pixels
  * **File Size**: ≤ 15 MB

  For larger GIFs, use the chunked upload endpoint with `media_category=tweet_gif` to enable asynchronous processing.

#### Video Specifications

**Recommended Settings**:

* **Codec**: H.264 High Profile
* **Frame Rates**: 30 FPS or 60 FPS
* **Resolutions**:

  * 1280x720 (landscape)
  * 720x1280 (portrait)
  * 720x720 (square)

  Subscribed users can upload 1080p videos and receive 1080p playback; unsubscribed users are limited to 720p.
* **Bitrates**:
  * **Video**: Minimum 5,000 kbps
  * **Audio**: Minimum 128 kbps
* **Audio Codec**: AAC Low Complexity (LC)
* **Aspect Ratios**: 16:9 (landscape or portrait), 1:1 (square)

**Advanced Constraints**:

* **Frame Rate**: ≤ 60 FPS
* **Dimensions**: Between 32x32 and 1280x1024 pixels
* **File Size**: ≤ 512 MB
* **Duration**: Between 0.5 seconds and 140 seconds\*
* **Aspect Ratio Range**: Between 1:3 and 3:1
* **Pixel Aspect Ratio**: 1:1
* **Pixel Format**: YUV 4:2:0
* **Audio Channels**: Mono or Stereo; 5.1 or greater is not supported
* **GOP Structure**: Closed GOP required; open GOP is not supported
* **Scan Type**: Progressive scan only; interlaced video is not supported

\* If your video doesn't meet Twitter's specifications, Contouron will attempt to convert it for you. In this case, the video must be shorter than 120 seconds.

### Instagram

#### General Guidelines

* **Caption Length**: Instagram captions are limited to 2200 characters.

#### Image Specifications

* **Format**: JPEG, PNG
* **File Size**: Maximum of 8 MB
* **Aspect Ratio**: Must be within a 4:5 to 1.91:1 range
* **Minimum Width**: 320 pixels (images will be scaled up to this width if smaller)
* **Maximum Width**: 1440 pixels (images will be scaled down to this width if larger)

For optimal display, it's recommended to use square images with a 1:1 aspect ratio. This ensures that your content utilizes the maximum area on the platform.

#### Video Specifications

* **Format**: MP4 and MOV.
* **File Size**: Maximum of 100 MB
* **Duration**:
  * Minimum: 3 seconds
  * Maximum:
    * Reel: 15 minutes\*
    * Story: 60 seconds
* **Aspect Ratio**: Must be within a 4:5 to 1.91:1 range
* **Minimum Width**: 320 pixels
* **Maximum Width**: 1440 pixels

Similar to images, using a 1:1 aspect ratio for videos is recommended to maximize on-screen display area.

\* If your video doesn't meet Instagram's specifications, Contouron will attempt to convert it for you. In this case, the video must be shorter than 120 seconds.

#### Carousel Specifications

* **Composition**: Images, videos, or a mix of both.
* **Number of Items**: 2 to 10.
* **Aspect Ratio Cropping**: All carousel items are cropped based on the first image. The default aspect ratio is 1:1.
* **Video Aspect Ratio:** 1:1 (square), 4:5 (portrait), and 1.91:1 (landscape)

Each item within the carousel must adhere to the respective image and video specifications outlined above.

### LinkedIn

#### General Guidelines

* **Character Limit per Post**: LinkedIn allows up to 3000 characters per post.

#### Image Specifications

* **Supported Formats**: JPG, GIF, and PNG.
* **File Size Limit**: Images must be ≤ 5 MB.
* **Pixel Count**: Images should have less than 36,152,320 pixels.
* **Animated GIF Constraints**:
  * **Frame Limit**: GIFs support up to 250 frames.

For optimal display, it's recommended to use images with a 1.91:1 aspect ratio, such as 1200 x 627 pixels. This ensures that your content utilizes the maximum area on the platform.

#### Video Specifications

* **Supported Format**: MP4.
* **File Size**: Between 75 KB and 500 MB.
* **Duration**: Between 3 seconds and 30 minutes.\*
* **Resolution**: Minimum of 256 x 144 pixels; maximum of 4096 x 2304 pixels.
* **Aspect Ratios**:
  * **Landscape**: 16:9
  * **Portrait**: 9:16
  * **Square**: 1:1
* **Frame Rate**: Up to 60 frames per second (fps).
* **Bitrate**: Up to 30 Mbps.

For optimal display across devices, consider using a square (1:1) aspect ratio with a resolution of 1080 x 1080 pixels. This format adapts well to both mobile and desktop environments.

\* If your video doesn't meet LinkedIn's specifications, Contouron will attempt to convert it for you. In this case, the video must be shorter than 120 seconds.

### Facebook

#### General Guidelines

* **Graph API Endpoints**: Max character limit is 63,206 characters

#### Image Specifications

* **Supported Formats**: JPEG, PNG, GIF, BMP, and TIFF.
* **File Size Limit**: Up to 30 MB.
* **Recommended Resolution**: At least 1080 pixels wide.
* **Aspect Ratios**:
  * **Square**: 1:1
  * **Portrait**: 4:5
  * **Landscape**: 1.91:1
* **Additional Recommendations**:
  * Use images with minimal text overlay to avoid reduced delivery.
  * Ensure images are clear and not pixelated or blurry.
  * For PNG files, keep the file size below 1 MB to prevent pixelation.

#### Video Specifications

All Facebook videos publish as **Reels**. Regular Facebook feed video posts are no longer supported.

* **Supported Formats**: MP4, MOV, AVI.
* **File Size Limit**: Up to 1 GB.
* **Duration**: Between 3 seconds and 90 seconds.
* **Minimum Resolution**: 540 x 960 pixels (width x height).
* **Aspect Ratio**: 9:16.
* **Frame Rate**: 24 to 60 frames per second.
* **Additional Recommendations**:
  * Use high-quality audio and include captions to enhance accessibility.
  * For videos with text overlays, ensure the text is within the safe zone to prevent cropping, especially on mobile devices.
  * Shorter videos (15 seconds or less) are more likely to capture viewer attention.

### TikTok

#### Description Specifications

* **Character Limit**: The character limit is 2200 characters.

#### Video Specifications

* **Supported Formats**: MP4 (recommended), WebM, and MOV.
* **Codecs**: H.264 (recommended), H.265, VP8, VP9.
* **Frame Rate**: Minimum of 23 FPS; maximum of 60 FPS.
* **Resolution**: Minimum of 360 pixels for both height and width; maximum of 4096 pixels for both height and width.
* **Duration**: Up to 10 minutes.\*
* **File Size**: Maximum of 4 GB.

\* If your video doesn't meet TikTok's specifications, Contouron will attempt to convert it for you. In this case, the video must be shorter than 120 seconds.

#### Image Specifications

* **Supported Formats**: WebP, JPEG.
* **Resolution**: Maximum of 1080 pixels.
* **File Size**: Maximum of 20 MB per image.

### Pinterest

#### Description Specifications

* **Description Character Limit**: 800 characters.
* **Title Character Limit**: 100 characters.
* **Alt Text Character Limit**: 800 characters.
* **URL Link Character Limit**: 2048 characters.

#### Image Specifications

* **Supported Formats**: PNG, JPEG.
* **File Size**: Maximum of 20 MB per image.

#### Video Specifications

* **Supported Formats**: MP4 (recommended), MOV.
* **Codecs**: H.264 (recommended), H.265.
* **Resolution**: 240p minimum
* **Duration**: Minimum 4 seconds, Maximum 5 minutes.\*
* **Audio**: Optional, but advisable.
* **File Size**: Maximum of 2 GB.

\* If your video doesn't meet Pinterest's specifications, Contouron will attempt to convert it for you. In this case, the video must be shorter than 120 seconds.

#### Carousel Specifications

* **Number of Items**: 2 to 5 images.

### Threads

#### Image Specifications

* **Supported Formats**: JPEG and PNG
* **File Size**: Maximum of 8 MB
* **Resolution**:
  * **Minimum Width**: 320 pixels (scaled up if smaller)
  * **Maximum Width**: 1440 pixels (scaled down if larger)
  * **Height**: Varies depending on width and aspect ratio
* **Aspect Ratio**: Between 10:1 and 1:10
* **Color Space**: sRGB (Images in other color spaces will be converted to sRGB)

#### Video Specifications

* **Supported Formats**:
  * **Container**: MP4 (MPEG-4 Part 14) or MOV
  * **Video Codec**: H.264 or HEVC (progressive scan, closed GOP, 4:2:0 chroma subsampling)
  * **Audio Codec**: AAC, maximum 48 kHz sample rate, mono or stereo
* **Resolution**:
  * **Maximum Width**: 1920 pixels
  * **Aspect Ratio**: Between 0.01:1 and 10:1 (9:16 recommended to avoid cropping or blank space)
* **Frame Rate**: Between 23 and 60 FPS
* **Bitrates**:
  * **Video Bitrate**: Variable bitrate (VBR), up to 100 Mbps
  * **Audio Bitrate**: Maximum 128 kbps
* **Duration**: Between 1 second and 5 minutes (300 seconds)\*
* **File Size**: Maximum of 1 GB

\* If your video doesn't meet Threads' specifications, Contouron will attempt to convert it for you. In this case, the video must be shorter than 120 seconds.

#### Text and Media Post Limitations

* **Text Posts**: Limited to 500 characters per post
* **Media Per Post**: 1 image or video per Threads post. The Threads API does not support carousel posts, so a `mediaUrls` array with more than one item fails with the error "Threads only supports a single image or a video".
* **Posting Multiple Images**: Publish a thread instead, with one image per post. Put each extra post in the `additionalPosts` array with a single item in its `mediaUrls`: post 1 contains image 1, post 2 contains image 2, and so on.

### Bluesky

**Post Character Limit**: 300 characters per post

**Image Guidelines:**

* **Up to 4 images**
* **Single and multiple image posts**:
  * Square: 1080 x 1080 pixels
  * Landscape: 1200 x 627 pixels
  * Portrait: 627 x 1200 pixels

### YouTube

#### Video Specifications

* **Supported Formats**: YouTube accepts various video formats, including MP4, MOV, AVI, WMV, FLV, 3GPP, and WebM.

  [elfsight.com](https://elfsight.com/blog/requirements-uploading-video-youtube/?utm_source=chatgpt.com)
* **Recommended Format**: MP4 with H.264 video codec and AAC-LC audio codec is recommended for optimal quality and file size.

  [support.google.com](https://support.google.com/youtube/answer/1722171?hl=en\&utm_source=chatgpt.com)
* **Resolution and Aspect Ratio**:
  * Standard aspect ratio: 16:9.
  * Recommended resolutions:
    * 2160p (4K): 3840x2160
    * 1440p (2K): 2560x1440
    * 1080p (Full HD): 1920x1080
    * 720p (HD): 1280x720
    * 480p (SD): 854x480
    * 360p: 640x360
    * 240p: 426x240
  * For videos intended for sale or rental, a minimum resolution of 1920x1080 is required.[support.google.com](https://support.google.com/youtube/answer/4603579?hl=en\&utm_source=chatgpt.com)
* **Frame Rate**: Content should be encoded and uploaded in the same frame rate it was recorded. Common frame rates include 24, 25, 30, 48, 50, and 60 frames per second.

  [support.google.com](https://support.google.com/youtube/answer/1722171?hl=en\&utm_source=chatgpt.com)
* **Bitrate**: Choose H.264 encoding for the best balance of quality and file size. Keep the bitrate between 8 Mbps (1080p) and 35 Mbps (4K).

  [zebracat.ai](https://www.zebracat.ai/post/best-video-format-youtube-updated-guide?utm_source=chatgpt.com)
* **File Size and Duration**: Verified accounts can upload videos up to 256 GB or 12 hours\*, whichever is less.

  [en.wikipedia.org](https://en.wikipedia.org/wiki/List_of_YouTube_features?utm_source=chatgpt.com)

\* If your video doesn't meet YouTube's specifications, Contouron will attempt to convert it for you. In this case, the video must be shorter than 120 seconds.

#### Image Specifications

* **Channel Art (Banner Image)**:
  * Recommended dimensions: 2560x1440 pixels.
  * Safe area for text and logos: 1546x423 pixels (centered).
  * Accepted file types: JPG, GIF, BMP, or PNG.
  * Maximum file size: 6 MB.[adobe.com](https://www.adobe.com/express/discover/sizes/youtube?utm_source=chatgpt.com)
* **Profile Picture**:
  * Recommended dimensions: 800x800 pixels.
  * Aspect ratio: 1:1.
  * Accepted file types: JPG, PNG, GIF, BMP.
  * Maximum file size: 2 MB.[plannthat.com](https://www.plannthat.com/youtube-video-sizes/?utm_source=chatgpt.com)
* **Video Thumbnails**:
  * Recommended dimensions: 1280x720 pixels.
  * Minimum width: 640 pixels.
  * Aspect ratio: 16:9.
  * Accepted file types: JPG, GIF, BMP, or PNG.
  * Maximum file size: 2 MB.[shopify.com](https://www.shopify.com/blog/youtube-thumbnail-size?utm_source=chatgpt.com)

#### Text Specifications

* **Video Titles**:
  * Maximum length: 100 characters.
  * Ensure titles are concise, descriptive, and include relevant keywords.
* **Video Descriptions**:
  * Maximum length: 5,000 characters.
  * Provide detailed information about the video content, including relevant links and timestamps.
* **Tags**:
  * Use relevant keywords to improve searchability.
  * Avoid using excessive or misleading tags.


---

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