# Formats and limits per network

> From Bynor you publish posts, carousels, Reels and Stories on Instagram; photos, photo carousels, videos, Reels and Stories on Facebook; videos and photo carousels on TikTok; Shorts on YouTube; text, images, image collages, videos and PDF documents on LinkedIn. Captions over the network's limit are stopped when you schedule. Carousels go up to 10 slides on Instagram, 15 on Facebook, 20 on LinkedIn and 35 on TikTok.

Source: https://bynor.ai/guide/formats-and-limits.html · Section: Scheduling and publishing · Updated: 2026-10-15

## What you can publish

| Network | Formats available from Bynor |
|---|---|
| Instagram | Photo post, carousel (photos and videos), Reel, Story, Trial Reel |
| Facebook | Photo, photo carousel, video and Reel, Story |
| TikTok | Video, photo carousel |
| YouTube | Short (vertical video up to 3 minutes) |
| LinkedIn | Text post, image, image collage, video, PDF document (carousel) |

## Caption length

| Network and format | Maximum characters |
|---|---|
| Instagram post, carousel, Reel | 2,200 |
| Instagram Story | No caption |
| Facebook post and Reel | 63,206 |
| Facebook Story | No caption |
| TikTok video (title) | 2,200 |
| TikTok photo carousel | 4,000 |
| YouTube (description) | 5,000 bytes: emoji and accented letters count as more than one. The title is cut at 100 characters |
| LinkedIn | 3,000 |

If a caption is longer than the limit, Bynor stops it when you schedule the post and asks you to shorten it. TikTok removes line breaks from captions.

## Carousels

| Network | Slides | Content |
|---|---|---|
| Instagram | 2 to 10 | Photos and videos (each video up to 60 seconds) |
| Facebook | 2 to 15 | Photos only |
| TikTok | 2 to 35 | Photos only |
| LinkedIn | 2 to 20 | Images only, published as a PDF document or as an image collage |
| YouTube | Not available | |

## File size when publishing

Bynor compresses videos so they stay within these limits; on Instagram and Facebook, videos over 100 MB are compressed further. When one post goes to several networks, the smallest limit applies.

| Network and format | Size |
|---|---|
| Instagram post and Reel | 300 MB |
| Instagram Story | 100 MB |
| Facebook post, video and Reel | 500 MB |
| Facebook Story | 100 MB |
| TikTok video | 500 MB |
| YouTube Short | 500 MB |
| LinkedIn video | 500 MB |

A LinkedIn PDF document can be up to 100 MB. You can upload files up to 2 GB to Post Pilot; the sizes above apply when the post goes out.

## Other rules to know

- **Instagram feed photos** look best at 4:5 (1080×1350). Reels and Stories are vertical, 9:16.
- **Stories** contain one image or one video.
- **YouTube**: Bynor publishes only Shorts, vertical videos up to 3 minutes. Horizontal videos and photos are not accepted.
- **TikTok** asks you to choose the privacy level of every video.
- **LinkedIn** videos last 3 seconds to 30 minutes. A LinkedIn carousel goes out by default as a **PDF document** that people swipe through in the feed; in the post you can switch **Format** to **Image collage**. The **Document title** (up to 100 characters) appears above the slides; if you leave it empty, Bynor uses the first line of the caption.
- **Instagram** requires a professional account (Business or Creator).

## Frequently asked questions

### What is the caption limit on Instagram?

2,200 characters for posts, carousels and Reels. Stories have no caption.

### How many photos can an Instagram carousel have when published from Bynor?

Up to 10 items, photos or videos.

### Can I publish a PDF carousel on LinkedIn?

Yes. A carousel published on LinkedIn goes out by default as a PDF document (up to 20 slides and 100 MB), with a title shown above the slides. You can choose an image collage instead.

### Can I publish a photo on YouTube?

No. On YouTube Bynor publishes only Shorts, vertical videos up to 3 minutes.