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Mikhail Bogovalov
Mikhail Bogovalov

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Build an Auto-Posting Instagram Bot in 20 Lines of Python

#ai #python #automation #tutorial

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:

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

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

Example output

Prerequisites 

pip install rendrkit instagrapi requests
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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()}")
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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"
)
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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)
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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

For generative art? Use DALL-E. For professional branded content? Use templates.

Other Ideas You Can Build

This same pattern works for:

  • Twitter/X auto-poster — generate OG images for your threads
  • Email newsletter headers — fresh header image every issue
  • Slack bot — /motivate command that generates and posts a quote
  • E-commerce — auto-generate product banners from your catalog
  • Certificates — generate completion certificates for your course platform

Available Templates

RendrKit has 69+ templates including:

  • social-quote — motivational quotes, tips
  • blog-post-cover — article headers
  • product-showcase — product announcements
  • stats-banner — metrics and numbers
  • hiring-post — job announcements
  • event-poster — event promotions
  • certificate — completion certificates
  • invoice — business documents

Full list: rendrkit.dev/templates

Get Started

  1. Grab a free API key at rendrkit.dev
  2. pip install rendrkit
  3. Start generating

The free tier gives you 50 images/month — enough to post daily and test everything.

I'm building RendrKit as a solo dev. If you have questions or feature requests, hit me up on Twitter/X or drop a comment below.

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