The right format for every destination.

Up to 10 images. Multiple images publish as one Instagram carousel. Videos publish separately as Reels. Select up to 10 files per placement; each Reel video or Story file publishes separately.

One feed image creates a photo post. Two to ten feed images create one swipeable Instagram Image Carousel. Unlike Facebook Linked Carousel, there is no separate destination URL on each image. The ten-file limit applies to the selected feed media.

Postly groups the feed images into one image post or carousel and publishes each video separately as a Reel. It does not currently combine images and videos into one mixed carousel, even though Instagram supports that format.

One video per published Reel. Select up to ten videos in the Reel selection to publish separate Reels; they are not joined into one video. Images cannot be used as Reel attachments.

One image or video per published Story. Select up to ten files in the Story selection to publish separate Stories; this is not a carousel. Story availability depends on account eligibility.

Postly supports JPEG and PNG directly, up to 8 MB per image. You can also upload other supported image formats; the editor converts them when needed. Feed image ratios are 4:5–1.91:1. Use 9:16 for Stories and review each placement before publishing.

MP4 or MOV. Reels: 3 seconds–15 minutes, maximum width 1920 pixels; 9:16 recommended. Postly allows up to 1 GB, subject to your plan. For reliable preparation, keep Reels at 300 MB or less: Meta’s current media reference lists 300 MB, while its example collection lists 1 GB. Stories: prepare 3–60 seconds, up to 100 MB. Videos are not automatically trimmed or compressed.

Upload supported image formats, including JPEG and PNG. In the editor, Postly automatically converts supported images when a destination needs a different format, while keeping compatible images unchanged. Use Fix images in the channel preview for remaining size or aspect-ratio issues, then review the result. Repairs are checked again. Tiny originals, unreadable files and images that still exceed requirements need replacing or manual export. Enlarging cannot restore missing detail. Videos are not automatically compressed or re-encoded.

Postly checks supported media types, format, size and available duration and dimensions. A small, time-limited MP4/MOV header check can identify video encoding, reported frame rate and average bitrate. Other formats, metadata at the end of a file and unavailable headers remain unverified; codecs, audio, frame timing and peak bitrate are not fully verified. No video is converted, trimmed, cropped or re-encoded. Re-export incompatible files for the selected destination. Checks cannot guarantee provider acceptance.