Format guidelines for each network
What each network accepts in length and text, what CutPro blocks and what it only warns about, because the one that really rejects things is the platform.
Updated September 26, 2026Every network has its limits, and CutPro treats two groups differently: what it blocks before sending, and what it only warns about, leaving the call to you.
Text and length limits
| Network | Text | Video length |
|---|---|---|
| TikTok | up to 2,200 characters | up to 10 min (your account may have a lower ceiling) |
| up to 2,200 characters | up to 15 min | |
| up to 63,206 characters | Reels up to 90 s; feed video with no practical ceiling | |
| X | up to 280 characters | up to 2min20 |
| up to 3,000 characters | up to 10 min | |
| Bluesky | up to 300 characters | up to 1 min |
| title up to 100 and description up to 800 characters | up to 15 min | |
| Telegram | up to 1,024 characters | no length ceiling; file up to 50 MB |
| Mastodon | up to 500 characters | no length ceiling; file up to about 100 MB, depending on the server |
| Discord | up to 2,000 characters | no length ceiling; file from 10 to 100 MB, depending on the server's boost level |
| Dailymotion | title up to 255 and description up to 3,000 characters | up to 60 min |
| Tumblr | up to 4,096 characters | no length ceiling; file up to 500 MB |
| Slack | up to 4,000 characters | no length ceiling; file up to 1 GB |
The text limit blocks: go over it and CutPro won't send. The length limit, on most networks, is only a warning: it lets you publish, but tells you the platform may reject it.
The exception is TikTok, which reports your account's real ceiling and is checked before sending.
What CutPro doesn't validate
Be realistic about this when you design your workflow:
- Aspect ratio (9:16, 1:1, 16:9) isn't checked. The network is what accepts or rejects it. Since CutPro delivers vertical by default this is rarely a problem, but if you changed the framing, check first.
- File size isn't checked before publishing. Telegram (50 MB) and Discord (10 MB on a server with no boost) have low ceilings: if the video goes over, the post fails when it's sent.
- There's no minimum length. A 3-second clip gets sent; if the network refuses it, that's the network refusing.
Network by network, in practice
TikTok. The thing that raises the most questions is privacy: while CutPro's app is under review by the platform, posts go out as "Only me". Beyond that, comments, duets and stitch may be locked if you yourself disabled them in your TikTok account settings, in which case the option shows as blocked here too.
If the video is promotional, use the commercial content disclosure controls. Marking "branded content" together with "Only me" privacy isn't allowed by the platform itself.
Instagram. Requires a Professional account. It supports collaborators (up to 3, and each has to accept the invite) and lets you rename the Reel's audio, but you can't add music from Instagram's catalog via API. If you want a track from their library, you have to publish manually.
Facebook. Publishing goes to a Page (a personal profile will not do), and you choose between Reel and feed video. Reels cap at 90 seconds, for anything longer, pick feed video, which accepts practically any length.
X. It's the only network that costs 1 credit per post. Video and images don't mix in the same post.
Bluesky. The 1-minute limit is short and blocks a lot of podcast cuts: worth planning the clip with that in mind. It requires a confirmed email on the account to accept video.
LinkedIn. Long text is the differentiator: 3,000 characters give room for context, which tends to work better there than a short TikTok-style caption.
Pinterest. Every pin needs a destination board, and both title and description are required. A video pin also needs a cover: if you don't pick one, CutPro uses the first frame. The link field is optional and sends anyone who clicks to the address you set.
Telegram. Posts go to a channel or group, not your profile. You can send silently, without notifying the channel's followers. The 50 MB file ceiling is Telegram's own limit for bots: a long clip in high quality can go over it.
Mastodon. You pick the visibility (public, unlisted or followers only) and can mark the post as sensitive, with a warning shown before the video. The 500 characters are the default: some servers accept more, but CutPro holds to the safe limit.
Discord. Each post goes to a text or announcement channel you pick on the server. Discord doesn't take a separate cover, so the cover you choose becomes the video's first frame. The file ceiling rises with the server's boost level.
Dailymotion. Title and category are required, and the video can be public or private. It's the network with the most room for length: up to 60 minutes.
Tumblr. Accepts long text and its own tags, kept apart from the post text.
Slack. Each post goes to a channel you pick in the workspace. A private channel only shows up in the list after you add the Cut.Pro app to it. Slack doesn't take a separate cover, so the cover you choose becomes the video's first frame.
Images
When a post carries images instead of (or alongside) video, each network has its own cap, and CutPro warns you when the extras will be dropped. YouTube doesn't accept image-only posts, and that one is blocked.
What actually affects results
Two things that aren't technical limits but do sink reach:
- Identical text across many accounts. The networks detect it and react: Instagram goes as far as stripping the caption. That's why CutPro turns on automatic text variation above ten accounts.
- Volume on a new account. A freshly created account taking ten posts a day tends to get limited. CutPro's automatic publishing respects a warm-up period and a ceiling of 10 posts per day per account: don't work around it.
More on scheduling and cadence in scheduling posts with the Calendar.