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Social publishing

Media requirements

Formats, sizes and aspect ratios each network accepts, and what we convert.

Rules for every upload

  • The maximum upload size is 200 MB per file.
  • Images can be JPEG, PNG, WebP, or GIF where the destination supports them.
  • Videos can be MP4, MOV, or WebM where the destination supports them.
  • PNG images are converted to JPEG when required for compatibility.
  • Provider processing can still reject a file after Systemly's validation passes.

Limits by network

NetworkCaptionImagesVideo
Instagram2,200 characters1–10 JPEGMP4 or MOV; up to 10 media total
Facebook63,206 characters0–10 JPEG, PNG, GIF, WebPMP4, MOV, or WebM
TikTok2,200 characters1–35 JPEG or WebPExactly one MP4, MOV, or WebM; do not mix
LinkedIn3,000 characters0–9 JPEG, PNG, or GIFOne MP4 or MOV
YouTube5,000 charactersNot supportedExactly one MP4, MOV, or WebM
X280 characters0–4 JPEG, PNG, GIF, or WebPNot currently supported
Pinterest500 charactersExactly one JPEG, PNG, or WebPNot currently supported

Dimensions, aspect ratio, and duration

Systemly validates the file type, count, and size, but it does not crop media into a platform-specific aspect ratio. Prepare media to the destination's current recommended dimensions and duration. Networks can change those rules or apply additional account and post-type limits without notice.

Keep media available during processing

Some providers fetch the file from Systemly after the initial request. Do not remove or replace an uploaded asset while a post is Scheduled or Processing. For the same reason, social media uploads should not contain private documents or confidential information.