Images, video and documents
Attach photos, videos, GIFs and PDFs, add alt text, crop, and pick a video's cover.
Add media
Drag files onto the editor, paste an image, or use Add media in the toolbar. Images and videos upload in the background while you keep writing; a video shows Processing… while it's prepared for publishing.
Each network has its own limits on how many files, how large, how long and what shape. The composer checks every file against every channel the post is going to, while you write, and lists anything a network won't take under Issues. The platform pages have each network's numbers.
| You want to post | Use |
|---|---|
| Photos | Up to 4 on X, Bluesky and Mastodon; up to 10 on Instagram, Threads, Facebook, Discord, Slack and Telegram; up to 9 on LinkedIn. |
| A video | One per post on most networks, and not mixed with images. |
| A GIF | Add GIF searches GIPHY. On most networks a GIF can't share a post with other media. |
| A PDF | Add document on LinkedIn, shown as a swipeable carousel. A document replaces any other attachments. |
Alt text
Click an image to open it, then write a description under Describe this image for people who can't see it. Screen readers read it aloud, and most networks show it to people who ask. Choose the sparkle button beside it to have Orb write a first draft from the image.
Alt text is sent to every network that supports it: X, Bluesky, Mastodon, LinkedIn, Facebook, Threads and others. The post score reminds you when an image has none.
Cropping
Instagram only takes images between 4:5 portrait and 1.91:1 landscape, and crops every slide of a carousel to the shape of the first. When an image doesn't fit, the composer offers Crop to fit, or Crop all to fit for a carousel. You can adjust each crop before you publish.
Video covers
The cover is the frame people see before they press play.
- Instagram Reels: pick a frame from the video, or upload your own JPEG, PNG or WebP image.
- TikTok: pick a frame from the video.
- Pinterest: pick a frame, or upload an image.
Open the video and choose Cover frame or Custom image. The cover can change until the post goes out. Other networks don't let any app set a cover, so they show their own default.
Tagging people on Instagram
Open a photo and choose Tag people, then click where each person appears and enter their Instagram username. Tags show on the photo and on each person's Tagged tab. Only public accounts can be tagged.
For a video, enter the usernames of the people in it. Collaborators invites up to three accounts to co-author the post, so it appears on their profiles too.
AI-generated labels
Where a network has a label for AI-generated content, the composer offers a switch for it:
| Network | Label |
|---|---|
| "AI info" (not on Stories) | |
| TikTok | "Creator labeled as AI-generated", which can't be removed after publishing |
| YouTube | "Altered or synthetic content", for realistic video made or changed with AI |
| X | "Made with AI", on posts with media |
| "AI modified" |
Video requirements worth knowing
- TikTok and Instagram refuse videos under 23 frames per second, which catches some screen recordings. Re-export at 24 or 30 fps.
- YouTube posts are videos. Shorts must be vertical and short; see YouTube.
- Instagram Stories don't publish text: the caption is ignored.
Storage
Uploads count toward your plan's media storage. See Plans and billing.