Crosspost from Reddit to Instagram Automatically
Auto post Reddit to Instagram instantly — no downloads, no re-uploads, no manual work. Just publish on Reddit and your content appears on Instagram.
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Why Reddit-to-Instagram crossposting is harder than it looks
! Reddit's 10% self-promotion rule limits using it to promote Instagram
+ ! Instagram's API makes it hard to auto-post Reddit content there
+ ! Reddit posts are text; Instagram requires visuals
+ ! Sharing Instagram links on Reddit often triggers spam filters
↓ There's an easier way
What You Need to Know
How creators adapt Reddit content for Instagram
The most common approach: screenshot a compelling Reddit post or comment, clean it up in Canva or a similar design tool, and post it as an Instagram image or carousel.
For Reels, some creators film a reaction video to a Reddit thread or use screen recordings overlaid with voiceover.
If you are the Reddit poster, you can reference the thread in your Instagram caption without copying the full content.
Uploading Reddit Reels directly to Instagram by downloading the video and re-uploading is technically possible but skips any Reddit attribution.
Getting Instagram to feel native, not like a Reddit screenshot dump
Instagram followers do not want to read dense Reddit thread text — they want a visual that stops them from scrolling.
Use the punchline or the most interesting line as large-format text on a clean background.
Add your own reaction or commentary as a caption.
For carousels, break the Reddit post into slides, one idea per slide.
Keep it tight.
If you are referencing a subreddit discussion, name the community (r/AskReddit, r/personalfinance) — it lends credibility without requiring followers to visit Reddit.
PostOnce moves your Reddit content to Instagram automatically
Connect Reddit and Instagram in PostOnce, and your posts flow between platforms without manual work.
PostOnce picks up your Reddit content and distributes it to Instagram — images, links, and text handled automatically.
One post on Reddit, instant reach on Instagram.
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Features
How PostOnce Handles It
Set up Reddit to Instagram crossposting once. PostOnce automates the rest.
Easy Reddit Crossposting Setup
Connect your Reddit and Instagram accounts, choose your crosspost rules, and you're done.
Setup takes under 60 seconds. After that, everything runs automatically in the background.
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Native Video Upload to Instagram
When you crosspost Reddit to Instagram, PostOnce uploads the actual video file — not a link, not a preview.
Your Reddit content appears as a native Instagram post, indistinguishable from content uploaded directly.
Start your free trialCustom Crosspost Rules
Not every Reddit post belongs on Instagram. Set hashtag filters, content type rules, or account-level controls to choose what gets crossposted.
Only the content you want on Instagram ends up there.
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Auto Post to Multiple Platforms
Don't stop at Reddit to Instagram crossposting. Auto post your Reddit content to YouTube Shorts, Facebook, LinkedIn, Threads, and more — all at once.
One post, everywhere. Each platform gets a native upload with adapted formatting.
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Real-Time Automation
PostOnce monitors your Reddit account and automatically crossposts new content to Instagram.
No scheduling, no batching. Publish on Reddit and it appears on Instagram within minutes — fully automated Reddit to Instagram posting.
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Reddit vs Instagram at a Glance
| Spec | ||
|---|---|---|
| Caption Limit | 40,000 chars | 2,200 chars |
| Max Video Length | 15min | 1h |
| Preferred Aspect Ratio | 16:9 | 9:16 |
| Max Video File Size | 1GB | 4GB |
| Carousel Support | Up to 20 items | Up to 10 items |
| Hashtag Strategy | Not used | Up to 30 |
| Link Support | Yes | No |
| Primary Audience | 18-39 | 18-34 |
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Under 60 seconds. Connect both your Reddit and Instagram accounts, choose your filter rules, and you're done. New Reddit posts will automatically appear on Instagram.
PostOnce automatically adapts your 16:9 Reddit videos to Instagram's preferred 9:16 format, ensuring they look native.
Yes. Use hashtag filters to control which posts crosspost. For example, add #crosspost to Reddit captions and only those posts will go to Instagram. Or exclude specific hashtags to skip certain content.
PostOnce intelligently adapts your captions from Reddit's 40,000 character limit to fit Instagram's 2,200 character limit, preserving your key message.
Start Crossposting Reddit to Instagram
Connect your Reddit and Instagram accounts and start crossposting in minutes. No technical setup required.
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