Ad copy length limits for LinkedIn, Pinterest, X and Instagram

The limits differ by platform, so check generated copy per placement: LinkedIn's lead form headline is 60 characters and details 160, Pinterest titles hold 100 and descriptions 800, X lead forms cap a name at 255 and a purpose at 1000, and Instagram Feed video primary text is 125. Run the checker below over every item of a Sume bulk run before upload.

Limits by placement

Each row comes from the vendor page named in the sources.

One checker for all of them

Keys follow the table. The function returns a list of problems per item.

LIMITS = {
    "linkedin_form": {"headline": 60, "details": 160},
    "linkedin_video": {"intro": 150, "headline": 70},
    "pinterest": {"title": 100, "description": 800},
    "x_lead": {"name": 255, "purpose": 1000},
    "instagram_feed": {"primary": 125},
}

def problems(platform: str, copy: dict) -> list[str]:
    return [f"{k}: {len(copy.get(k, ''))} > {m}"
            for k, m in LIMITS[platform].items() if len(copy.get(k, "")) > m]

print(problems("pinterest", {"title": "x" * 120, "description": "ok"}))
print(problems("instagram_feed", {"primary": "Short line"}))

Use it

Fail the item, not the batch: log the index, fix the instruction, and resubmit only those indexes.