Instagram

Instagram Ads Character Limits 2025: Every Field Explained

Instagram ads have different character limits to organic posts — and exceeding them doesn't just truncate your copy, it can cause ad disapprovals or suppress delivery. Here's every limit you need to know before launching a campaign.

Instagram Ad Character Limits at a Glance

Ad Field	Recommended	Maximum
Primary text	125 chars	300 chars
Headline	27 chars	40 chars
Description	27 chars	30 chars
CTA button	–	Pre-set options only

Primary Text: 125 vs 300 Characters

Instagram's primary text field accepts up to 300 characters, but only the first 125 are shown before a "...more" link. This mirrors organic caption behaviour — your opening sentence must do all the work.

Research from Facebook's own ad data shows that primary text under 125 characters outperforms longer text in most placements. Lead with your strongest benefit or offer, then let curious users tap for more.

Headlines and Descriptions

Headline and description fields appear in feed ad placements below the image or video. They're optional but recommended — they add context and can improve click-through rates. Keep headlines punchy (a benefit or offer) and descriptions specific (a qualifying detail or urgency signal).

Story and Reel Ads

Story ads and Reel ads are primarily visual — text overlaid on creative should follow the 20% text rule guideline. Heavy text overlays can reduce delivery. For text on Stories, keep it to one or two short lines that don't obscure the main visual.

Ad Copy Best Practices

• Lead with the benefit, not the feature
• Use numbers and specifics ("Save 40%", "3-step process")
• Match your ad copy tone to your landing page copy
• Test two or three primary text variations per ad set