Turn a carousel into a Reels video

Turn a carousel into a 1080 × 1920 vertical video (MP4) for Instagram Reels, TikTok, and WhatsApp Status. Each slide shows for a few seconds with a transition. Creating a video doesn't use AI credits.

Who can use it?

• The Pro, Ultimate, and Agency plans. On other plans the video option is marked Pro and opens an upgrade prompt (see Pricing).
• There is a daily limit of new videos per workspace that depends on your plan. What's left is shown in the video dialog and resets at 00:00 WIB.
• This feature is opening gradually. If Reels video (MP4) isn't in the Download menu, your account isn't included yet.

Create a video

1. Open the carousel in the studio and wait until your changes are saved.

2. Click Download, then choose Reels video (MP4).

3. Set the Time per slide (2–8 seconds) and the Transition (None, Fade, or Slide). If the carousel ratio isn't 9:16, also choose a Ratio:

   • Adapt to 9:16 (default): the template's 9:16 layout is used, so text can shift slightly from the original ratio. Check the result before uploading.
   • Keep original ratio: the whole slide sits in the middle of the screen on a blurred background made from that slide.

   Some templates have less room for text at 9:16. If a slide's text is too long for the 9:16 layout, the dialog names the slide and selects Keep original ratio so the text isn't cut off. You can still choose Adapt to 9:16 after shortening the text in the studio.

4. Click Create video. The video is queued, the slides are rendered, then the video is put together. You can close the dialog; you'll be told when the video is ready.

5. Play the result, then click Download MP4 or Share. On a phone, Share opens the share sheet (WhatsApp, Instagram, TikTok, and more); see Share to WhatsApp.

Videos are currently capped at 90 seconds; if longer, the time per slide is shortened automatically. Videos are kept for 24 hours under Recent videos · kept for 24 hours, so download them before they expire or keep them permanently.

Keeping videos

Every Reels video in the workspace (from all carousels) is in My content → Videos, newest first. There you can play, download, share, and search videos by carousel title. The Temporary and Kept filters separate the two.

• Temporary (default): a video lasts 24 hours after it is made and doesn't use storage. Its card shows the time left, for example Expires in 5 hours.
• Keep permanently: click this on a video card (or in the studio video dialog) so the video never expires. The video is copied to your workspace storage, counts toward your storage quota, and is labelled Kept permanently. If storage is full, empty the Trash or click Add storage.
• Kept videos stay even if their carousel is deleted, and are reused when you make the same video again or schedule it as a Reel.
• Delete on a kept video moves it to the Trash and frees its storage right away. Temporary videos are only hidden; the file still expires on its own.

Keeping videos needs the editor role or higher. View-only members can still play and download.

Animation

To make the video feel alive, choose an Animation in the video dialog. A short preview of the first slide appears next to it.

• None: still slides with only the transition between slides (as before).
• Subtle: on each slide the text appears one part at a time (label, title, body, then the call-to-action button), fading in and rising slightly; photos move slowly (a light zoom).
• Dynamic: text comes in faster and bolder, and photos zoom more, alternating direction.

Animation doesn't change the video length and uses no AI credits. Text that doesn't fit 9:16 still follows the Ratio choice above. Animated videos take a little longer to process. If your phone or computer is set to reduce motion, the preview in the dialog stays still, but the video is still animated.

Adding music

If the dialog doesn't have a Music option yet, the video has a silent audio track. Add a song when you upload it in the app:

1. Instagram: create a new Reel, pick the video from your gallery, tap the music or audio icon, search for a song, then choose the part you want.
2. TikTok: tap the plus (+) button, upload the video from your gallery, then tap Add sound at the top of the screen and pick a song.

Business accounts can usually only use songs from the platform's commercial music library. Songs from the official Instagram or TikTok libraries are safe to use within the platform's rules.

When the Music option is available in the dialog, all its music is CC0 or public domain. Content ID systems sometimes still wrongly claim CC0 music. If that happens, appeal on the platform with the proof in Music licences, or re-upload the video with No music (silent audio).

Music licences

The video dialog only offers music licensed CC0 1.0 (dedicated to the public domain) or in the public domain: you can use it commercially, change it, and you don't have to credit the creator. CC0 licence: creativecommons.org/publicdomain/zero/1.0/. The track title appears in the dialog and below the finished video.

Current library (checked 21 Oct 2026; all from OpenGameArt.org, licensed CC0 only):

Title	Creator	Source page
Funky House	Of Far Different Nature	opengameart.org/content/funky-house
Sky Blue Street	MintoDog	opengameart.org/content/sky-blue-street
Fever Stadium	MintoDog	opengameart.org/content/fever-stadium
Sunflower Valley	isaiah658	opengameart.org/content/sunflower-valley
Happy Clappy Loop	OwlishMedia	opengameart.org/content/happy-clappy-loop
Bossa Nova	Joth	opengameart.org/content/bossa-nova
Chill lofi inspired	omfgdude	opengameart.org/content/chill-lofi-inspired
Snowfall	Kistol	opengameart.org/content/snowfall

This list can change: tracks that don't appear in the dialog are no longer used. When you appeal a Content ID claim:

1. Give the track title and creator, then paste the source page link and the CC0 licence link above.
2. Explain that the music is licensed CC0 (public domain), so no copyright owner can claim it.
3. If the appeal is rejected or needs more proof, contact support; the Posto team keeps the licence proof for every track.

Posting to Reels

Download or share the video and upload it yourself, or let Posto post it automatically (see the next section).

Schedule Reels

Posto can post a carousel as a Reels video to Instagram, Facebook Pages, Threads, and TikTok (Pro, Ultimate & Agency plans).

1. In the video dialog, click Schedule as Reels or Post now. You can also click Schedule in the studio and choose Post format → Reels (video).
2. Set seconds per slide, transition, animation, ratio, and music. Below them you see the estimated length and each platform's limits (Instagram 3 seconds–15 minutes, Facebook 3–90 seconds, Threads up to 5 minutes, TikTok your account's limit). If the length is over a limit, remove slides or lower seconds per slide.
3. Choose accounts, write captions, then click Schedule. For TikTok, choose privacy and allow comments, Duet, or Stitch if you want.

The video is created automatically about 15 minutes before posting time and uses no AI credits. In the calendar, Reels schedules are marked Reels; the details show Preparing video → Uploading → Processed by platform → Published for each account, then a View post link.

If posting fails, the reason is shown in the schedule details. For example: a Facebook Page that can't receive Reels through the API yet (switch the format to carousel), or a video that is too long for your TikTok account. Click Retry after fixing it; Posto never posts twice.

Still stuck? Contact [email protected].