Auto-post to Instagram and TikTok with AI

Video 2 min 3 secAbout 40 min to do
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Lesson notes and steps

The written version of this session, with the commands and templates to copy.

Posting consistently to social media is one of the highest-leverage things a small business or nonprofit can do, and it is also one of the tasks that slips first when you are busy. This lesson sets up a system where AI writes your captions, you approve them in a batch, and Buffer queues them for automatic publishing. You do the work once a week and your accounts stay active.

What you will use

  • Buffer (free plan: up to 3 channels, 10 scheduled posts per channel as of this writing; check their current pricing at buffer.com)
  • ChatGPT or Claude (free tier, for caption drafts)
  • CapCut (free, for quick video edits on phone if needed)

Step 1: Connect your accounts to Buffer

Go to buffer.com and create a free account. Click "Connect a Channel" and connect your Instagram business account and your TikTok account. Buffer asks you to log in to each platform and grant posting permission. This takes about five minutes.

If your Instagram is a personal account, you need to switch it to a Creator or Business account in Instagram settings first. This is free and takes 60 seconds.

Step 2: Build a simple content bank

Before writing captions, collect five pieces of content you already have. These can be photos from your phone, screenshots of customer results, or short clips from events. You do not need to create anything new for this lesson. You are scheduling what you already have.

Drop the five files into a folder on your desktop labeled "Post Queue."

Step 3: Write a week of captions with AI

Open a chat with ChatGPT or Claude and use this prompt:

"I run a [type of business or organization]. Write 5 Instagram captions for the following content ideas: [list your 5 content pieces in one or two words each]. Each caption should be under 150 characters, include a clear call to action, and end with 3 to 5 relevant hashtags. Keep the tone [casual / professional / warm]."

You will get five drafts in under 30 seconds. Copy them into a simple text document with one caption per line, numbered to match your files.

Review pass: Read each caption out loud. If it sounds like a robot wrote it, add one specific detail about your business. AI is a first draft, not a final draft.

Step 4: Load your posts into Buffer

In Buffer, click "New Post" and select both Instagram and TikTok as targets. Upload your first image or video. Paste the matching caption. Set the schedule to a time when your audience is likely online (Buffer shows your top times if you have a connected account with history; otherwise use 9am, 12pm, or 7pm as starting points).

Repeat for all five pieces of content. Set each post to go out on a different day so you have one post per day for the week.

Step 5: Review and activate

Click through each scheduled post in the Buffer queue. Confirm the media looks right and the caption reads well. When you are satisfied, click "Approve" or simply leave it in the queue. Buffer will publish automatically at the scheduled times.

Set a recurring 30-minute slot in your calendar for every Monday morning. That is your content batch session for the week.

You are done when...

Your Buffer queue shows at least five posts spread across the next seven days, each with an image or video and an AI-drafted caption. The posts are set to publish automatically. You will not need to touch your phone at posting time.


Template included: Members get the full caption prompt pack for seven content categories (behind-the-scenes, testimonial, product, educational, seasonal, nonprofit story, and event), plus a weekly planning worksheet. Find it in your member dashboard under "Templates."

Want it done for you?

Short on time? Agentic Quarks will implement this end to end, wired into your stack, and hand you the keys.

Implementation engagements from $2,500
Narration transcript (what the video says)

Posting every day is how small accounts grow, and it is also the first thing that slips when you get busy. This lesson sets up a system where one sitting a week keeps Instagram and TikTok fed automatically.

Start with Buffer's free plan. Connect your Instagram and TikTok accounts once, and it becomes the single place your posts leave from. No more logging into two apps to publish the same thing twice.

Next, build a simple content bank. Real photos of your work, your space, your products, your events. Ten to twenty images you already have on your phone are enough to start. Behind the scenes always beats stock.

Then have ChatGPT or Claude write the week. Give it your business, your audience, and one example of how you actually talk, and ask for seven captions with hooks and hashtags. Edit the details, keep your voice, delete anything that sounds like a robot.

Pair each caption with a photo from your bank and load them into Buffer's queue for the week. Pick posting times when your audience is actually awake, and let the scheduler do the remembering.

Give the queue one last review and turn it on. From now on the weekly rhythm is fifteen minutes: refresh the photo bank, regenerate captions, reload the queue. The accounts stay alive whether your week goes to plan or not.

That is the entire trick: consistency without paying for a premium scheduler or a social media manager. Nonprofits get the same win: program photos, volunteer moments, and donor thank-yous, queued the same way.

You are done when seven posts are scheduled and the first one publishes without you touching your phone. Members get the caption prompt pack, the content bank checklist, and the weekly reset routine.

This free session pairs with the rest of the social course: auto-responding to comments and turning one video into thirty pieces of content. The full written walkthrough is below.

The course this session belongs to

What you will build in Social on Autopilot

Post, respond, and repurpose without the tools bill

3 sessions, 7 min of video, about 2.3 hours to do, 1 free.

  1. 01Auto-post to Instagram and TikTok with AIFree2:03 videoYou are here
  2. 02Auto-respond to comments and DMs with AIMember2:26 video
  3. 03Turn one video into 30 pieces of contentMember2:35 video
About Social on Autopilot

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Members share their results from this session in the community. See what is included.