This table lists the support for each social media channel in Meltwater Engage when creating new posts from Publish. Learn more about Channel-Specific Options in Engage Conversations.
All text, mentions, hashtags, emojis, and media attachments are validated within Engage, before sending to native channels, to ensure compliance with API limitations enforced by each social channel.
| Instagram* | TikTok | X | YouTube | Threads | ||
Post Text length | 8,000 | 2,200 | 3,000 | 2,200 | 280
25,000 for X Premium accounts | 5000 | 500 |
@mention | Yes | Yes - exact @handle only | Yes | Yes - exact @handle only | Yes | No | Yes |
Images | Yes (max 10) | Yes (max 10) | Yes (max 9) | No | Yes (max 4) | No | Yes (max 10) |
Links | Yes | No | Yes | No | Yes | No | Yes |
Videos | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Reels/Shorts | No | Yes | n/a | n/a | No | Yes | n/a |
Hashtags | No limit | Limit 30 hashtags in caption and the first comment combined | No limit | No limit | No limit | Limit 15 in video description | No limit |
Emojis | Yes | Yes | Yes | No | Yes | No | Yes |
Animated GIFs | Yes | No
| Yes | No | Yes | No | Yes |
Alt Text | Yes (500 characters) | No (Not available in API) | Yes (300 characters) | No | Yes (420 characters) | No | Yes (1,000 characters) |
Stories | No (Not available in API) | Yes | No (Not available in API) | No | No (Not available in API) | No | No |
Multilingual | Partial | Partial | Partial | Partial | Partial | Partial | Partial |
First Comment | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
*Instagram accounts are limited to 25 API-published posts within a 24-hour moving period.
Notes
A. Post text length
Instagram
A post cannot contain more than 30 hashtags between the caption and first comment, combined.
X
The following items are included in the message length and will affect the character limit:
New non-reply Tweets starting with a @mention.
Any @mentions added in the body of the Tweet.
Embedded links and URLs typed within the message body.
The following items are not included in the message length and won't affect the character limit:
When attaching images or videos to the message, the generated URL.
Leading spaces before the first character of a message.
YouTube
The description cannot contain more than 15 hashtags.
TikTok
TikTok’s API does not support line breaks in posts. If you add line breaks in the composer, they will be removed in the preview and may not appear in the final post on TikTok.
B: Image restrictions
All images must be JPG, or PNG format. In addition, be aware of the following channel-specific limitations:
Facebook
The maximum file size is 8MB
PNG images larger than 1MB may appear pixelated
Instagram
Feed
The maximum file size is 8MB
Photos must be within a 4:5 to 1.91:1 aspect ratio range
Story
The maximum file size is 8MB
Photos will automatically crop to a 9:16 aspect ratio.
Resolution will auto-scale
Reel
Images are not supported for Instagram Reels
LinkedIn
The maximum file size is 8MB.
TikTok
Accepted File Types: JPG and JPEG *TikTok’s API does not support PNG
Recommended Resolutions: 1080 × 1920 px or less
Maximum File Size: 20 MB per image (up to 35 images)
X
The maximum file size is 5MB.
Although X allows multiple images, you cannot mix a GIF image (animated or static) with any other image type.
YouTube
Images are not supported for YouTube
Threads
The maximum file size is 8MB
Photos must be within a 0.01:1 and 10:1 aspect ratio range
C: Links
Links are added through the automatic detection of links in all composers (general and channel-specific). If a bit.ly account has been connected, the links can be converted to shorter bit.ly links.
Facebook
Attached links will appear in a 'card' below the post. At this time, the 'card' can not be edited.
LinkedIn
Attached links will appear in a 'card' below the post. The 'card' can be edited by customizing the title, description, and Thumbnail for LinkedIn Links.
X
If X Cards have been enabled for the domain, attached links will appear in a 'card' below the tweet with an image and description. At this time, the 'card' can not be edited. If X Cards have not been enabled, you will receive an error message and the link will need to be embedded.
Note: For all links posted to X, the URL will not appear in the body of the post when posted, even if it appears in the body of the post in the Engage Publisher. This is because when posting, X strips the link and attaches it as a 'card' below the post. If two links have been added to a post, only the last link will have a 'card' once posted.
Learn more about the link process here.
D: Video restrictions
The following tables describe channel-specific limitations for videos.
Max file size: 3GB
Video length: Maximum 40 minutes
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
16:9 to 9:16 recommended but not enforced | None specified | None specified | None specified | Hevc or H.264 recommended but not enforced | AAC | None specified | None specified |
Instagram - Feed post
Max file size: 1GB
Note: Per Instagram, while they do allow videos up to 1GB it is recommended that videos stay under 100MB to decrease the likelihood of post fail.
Video length: Min 3 seconds, max 15 minutes
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
Between 0.01:1 and 10:1 will crop those to 9:16 when published | 1920 max horizontal pixels
| 23 fps to 60 fps | 25 fps max | Hevc or H.264 | AAC or 48KHZ | 128 kbps | 1 or 2 |
Instagram - Reel
Max file size: 1GB
Note: Per Instagram, while they do allow videos up to 1GB it is recommended that videos stay under 100MB to decrease the likelihood of post fail.
Video length: Min 3 seconds, max 15 minutes
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
Between 0.01:1 and 10:1 will crop those to 9:16 when published | 1920 max horizontal pixels
| 23 fps to 60 fps | 25 fps max | Hevc or H.264 | AAC or 48KHZ | 128 kbps | 1 or 2 |
Instagram - Story
Max file size: 100MB
Video length: Min 3 seconds, max 15 minutes
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
Between 0.01:1 and 10:1 will crop those to 9:16 when published | 1920 max horizontal pixels
| 23 fps to 60 fps | 25 fps max | Hevc or H.264 | AAC or 48KHZ | None specified | None specified |
Max file size: 5GB
Video length: Min 3 seconds, max 10 minutes
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
1:2.4 to 2.4:1 | min 256x144 max 4096x2304 | 10 fps to 60 fps | None specified | None specified | None specified | None specified | None specified |
TikTok
Max file size: 1GB
Video length: Min 3 seconds, max 10 minutes
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
None specified | Min height and width 360 px | 23 fps to 60 fps | None specified | None specified | None specified | None specified | None specified |
X
Max file size: 512MB
Video length: Min 0.5 seconds, Max 140 seconds
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
1:3 to 3:1 | Between 32x32 and 1280x1024 recommended but not enforced | 60 fps | None specified | H.264 or HEVC | AAC . recommended but not enforced | None specified | 1 or 2 |
YouTube
Max file size: 3GB
Video length: Max 15 minutes
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
None specified | None specified | None specified | None specified | H.264 recommended but not enforced | AAC recommended but not enforced | None specified | None specified |
Threads
Max file size: 1GB
Video length: Max 300 seconds (5 minutes).
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
None specified | None specified | 23-60 FPS | 25 Mbps | None specified | None specified | 128 kbps | None specified |
E: Reels / Shorts
Instagram Reel
Max file size: 1GB
Video length: Min 3 seconds, max 15 minutes
File type: MP4, MOV
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
Between 0.01:1 and 10:1 will crop those to 9:16 when published | 1920 max horizontal pixels
| 23 fps to 60 fps | 25 fps max | Hevc or H.264 | AAC or 48KHZ | 128 kbps | 1 or 2 |
YouTube Short
Max file size: 3GB
Video length: Max 60 seconds
File type: MP4, MOV
NOTE: There is no specific workflow to make the video appear as a YouTube short. The video will show up natively as a short as long as it is >60 seconds long and in portrait orientation.
Aspect Ratio | Dimensions/Resolution | Max. Frame Rate | Video Bitrate | Video Codec | Audio Codec | Audio Bitrate | Audio Channels |
None specified | None specified | None specified | None specified | H.264 recommended but not enforced | AAC recommended but not enforced | None specified | None specified |
F: Animated GIFs
Limit 1 GIF attachment per post.
Channel | Aspect Ratio | Max. Size | Max. Resolution | Formats |
4:5 to 1.91:1 (recommended) | 8MB | 1200x630 | GIF | |
4:5 to 1.91:1 | 4MB | 1200x627 | GIF | |
X | 4:5 to 1.91:1 | 15MB | 1200x675 | GIF |
Threads | None specified | 15MB | None specified | GIF |
X: Although you can attach multiple images to a Tweet, you can only have a single GIF. You also cannot mix a GIF image (animated or static) with any other image type.
G: Instagram Stories
Using the web app only - Learn More
Using the web app and mobile app together - Learn More
You can publish 1 media file (image or video) at a time for Instagram stories.
Instagram stories do not support descriptions, unique links, or first comments.
H: Multilingual
When creating content to publish, you can publish in any language.
Engage does not auto-translate text before you publish content.
I: Tagging Pages/Profiles
When creating content to publish, you can use an @mention:
When using @mention for Facebook, you are only able to tag pages, not specific profiles. This is an API limitation for Facebook.
For X, you are able to mention any public account that has not blocked your page.
When using @mention for LinkedIn, you can tag pages and profiles.
LinkedIn personal profiles must have certain settings enabled in order to be @mentioned:
Personal profiles must follow your page
Personal profiles must have Off-LinkedIn Visibility setting turned on
When creating your mentions please keep in mind the following functionality
The input is case-sensitive.
Multiple words should be joined using a space.
Numeric characters, wildcards, and Boolean logic are not allowed.
There is a minimum length of 3 characters if no special characters are included, and a minimum of 6 characters if including special characters.
You are not able to use the cross-channel compose box for @mentions. You will need to use the individual post compose box by selecting "Edit" under the post preview panel shown below:
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