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Build An Auto-posting Instagram Bot In 20 Lines Of Python

What if your AI agent could generate professional Instagram posts and schedule them automatically — with zero design skills?

I built RendrKit, a Design API that turns text into production-ready graphics. Today I'll show you how to combine it with Python to create an auto-posting Instagram bot in ~20 lines of code.

What We're Building

A Python script that:

Takes a topic (e.g., "productivity tips")
Generates a professional Instagram graphic via API
Posts it to Instagram automatically
Runs on a schedule (daily, hourly, whatever)

Here's the end result — generated entirely from text:

Prerequisites

pip install rendrkit instagrapi requests

A free RendrKit API key (50 images/month on free tier)
An Instagram account

The Code (Yes, It's Actually 20 Lines)

from rendrkit import RendrKit 
from instagrapi import Client 
from datetime import datetime 
 
# Setup 
rk = RendrKit(api_key="your-rendrkit-key") 
ig = Client() 
ig.login("your_instagram", "your_password") 
 
# Generate image from a text prompt 
result = rk.generate( 
    prompt="A motivational quote about productivity: 'Ship fast, learn faster.' Modern dark gradient design with bold typography", 
    size="1080x1080" 
) 
 
# Download the image 
import requests 
image_path = "/tmp/post.png" 
with open(image_path, "wb") as f: 
    f.write(requests.get(result["url"]).content) 
 
# Post to Instagram 
ig.photo_upload(image_path, "Ship fast, learn faster ????\n\n#productivity #startup #buildinpublic") 
print(f"Posted at {datetime.now()}")

That's it. Run it, and you've got a fresh Instagram post generated from nothing but text.

Level Up: Use Templates for Consistent Branding

The prompt mode is great for one-offs, but for a branded feed you want consistency. RendrKit has 69+ templates — pick one and fill in the slots:

result = rk.generate( 
    template_id="social-quote", 
    slots={ 
        "heading": "Ship fast, learn faster.", 
        "subheading": "The best feedback comes from real users.", 
        "accent_color": "#6366F1" 
    }, 
    size="1080x1080" 
)

Same API, but now every post matches your brand colors and layout. No more random AI-generated chaos.

Make It Automatic: Run Daily with Schedule

import schedule 
import time 
import random 
 
tips = [ 
    {"heading": "Ship fast, learn faster.", "subheading": "Real users give the best feedback."}, 
    {"heading": "Done > Perfect", "subheading": "Perfection is the enemy of progress."}, 
    {"heading": "Build in public.", "subheading": "Your journey inspires others."}, 
    {"heading": "Solve your own problem.", "subheading": "The best startups come from personal pain."}, 
    {"heading": "Talk to users daily.", "subheading": "Metrics lie. Conversations don't."}, 
] 
 
def post_daily(): 
    tip = random.choice(tips) 
    result = rk.generate( 
        template_id="social-quote", 
        slots={**tip, "accent_color": "#6366F1"}, 
        size="1080x1080" 
    ) 
    with open("/tmp/post.png", "wb") as f: 
        f.write(requests.get(result["url"]).content) 
    ig.photo_upload("/tmp/post.png", f"{tip['heading']}\n\n#startup #buildinpublic #productivity") 
    print(f"Posted: {tip['heading']}") 
 
schedule.every().day.at("09:00").do(post_daily) 
 
while True: 
    schedule.run_pending() 
    time.sleep(60)

Set it and forget it. Your Instagram posts itself every morning at 9 AM.

Why Not Just Use DALL-E or Midjourney?

Good question. I tried that first. Here's why templates win for social media:

	DALL-E / Midjourney	RendrKit Templates
Consistency	Every image looks different	Same brand, every time
Text rendering	Misspells words constantly	Pixel-perfect typography
Speed	5-15 seconds	1-2 seconds
Cost	$0.04-0.08/image	$0.001/image (direct render)
Brand control	Hope for the best	Exact colors, fonts, layout