Post to Instagram With the Right Picture Every Time

Instagram does not accept text-only posts, and it is fussy about the pictures it does accept. PostRSS takes the picture from your feed item and prepares it — format, shape and size — before publishing, so you never have to open an image editor to get an article onto Instagram. Our auto-post RSS to Instagram page is the place to start if you are setting this up now.

Instagram publishing is currently in testing while approval from Meta is pending.

What Instagram actually requires

These are Meta’s own rules for a published picture, not our preferences:

• JPEG only. PNG, WebP and GIF are refused outright.
• 8 MB maximum. Anything larger is rejected.
• Shape between 4:5 and 1.91:1. Taller or wider than that and the post is refused.
• Width between 320 and 1,440 pixels. Instagram scales this one itself.
• Reachable on a public address, because Meta fetches the file rather than receiving an upload.

The shape rule is the one that catches people out, because Instagram does not fix it for you. A banner-shaped header image from a blog post is usually far too wide, and a tall infographic is far too tall.

What PostRSS does with your picture

Every picture goes through the same steps before the post is created:

1. Taken from the feed item — the enclosure, the media element or the first image in the content.
2. Downloaded to our server, so Instagram is never sent to your site. Your server might be slow, protected, or serving a format Instagram cannot read.
3. Converted to JPEG if it is PNG, WebP or GIF — which today is most of them.
4. Cropped from the centre until the shape is inside Instagram’s allowed range. A 2000×400 banner becomes 764×400; a 400×2000 infographic becomes 400×500.
5. Resized so the width lands between 320 and 1,440 pixels.
6. Flattened onto white, because JPEG has no transparency and a transparent PNG would otherwise turn black.

Once Instagram has taken the file, the temporary copy on our server is deleted. We do not keep an archive of your pictures.

Why cropping happens from the centre

Cropping always loses something, and there is no perfect rule. Taking the middle is the choice that is wrong least often: logos, faces and products in article images tend to sit centrally, while the edges are usually background. If a particular image matters, the reliable fix is to give the feed item a picture that is already close to square.

Items with no picture at all

If a feed item has no image, there is nothing to publish — Instagram will not take a text-only post from any tool. PostRSS skips the item for Instagram, tells you why, and carries on publishing it to the other networks in your target list. Nothing is lost anywhere else.

Choosing Feed Images That Survive the Crop

PostRSS will fix the format, size and shape of any reasonable picture, but a little care on your side means the crop never removes anything important. A few habits help:

• Prefer square or slightly landscape images. Anything between 4:5 and 1.91:1 passes Instagram’s shape rule as it is, so nothing is cropped at all.
• Keep the subject in the middle. Because cropping happens from the centre, a product, face or logo placed centrally stays in the picture even when a wide banner is trimmed.
• Keep text away from the edges. Titles written into the image near the left or right edge are the first thing a centre crop cuts off.
• Use a real featured image, not a decorative header. Thin banner strips work on a website but make poor Instagram posts even after cropping.

None of this is required. It simply gives you control over the result instead of leaving it to the centre crop.

Checking Which Picture Your Feed Provides

If the image that reaches Instagram is not the one you expected, the answer is almost always in the feed itself. Open your feed address in a browser and look at the item: PostRSS uses the enclosure, the media element or the first image in the content. A theme or plugin that puts a small icon or an advertising banner first can change which picture is picked. Our guide on controlling which image gets auto-posted from your RSS feed explains how to make the right picture come first.

It is worth checking one or two items before connecting Instagram, especially on a site that has recently changed theme, image plugin or CDN settings.

The Same Picture on Your Other Networks

Instagram is the strictest network, but it is rarely the only one in a target list. The same feed item can go to a Facebook Page, a Pinterest board or a Telegram channel at the same time, each with its own settings. On those networks PostRSS takes the image from the feed item or from the Open Graph tags of the linked page, so the post carries the real picture there too. If an item has no picture and is skipped for Instagram, it is still published everywhere else, as described above. The full list of supported networks is on our features page.

Frequently Asked Questions

Do I need to prepare images in a particular size?

No. Anything reasonable works. A picture that is already between square and landscape will simply survive cropping untouched.

What if my site serves WebP?

It is converted to JPEG automatically. Most modern sites serve WebP, which is exactly why the conversion exists.

Does the quality drop?

Conversion uses a high JPEG quality setting. On a normal article image the difference is not visible at Instagram’s display size.

Can I set a default picture for items that have none?

That is coming. Today such items are skipped for Instagram with an explanation rather than published without an image, which Instagram would refuse anyway.

Can I publish to Instagram with PostRSS today?

Instagram publishing is currently being tested: the integration is built and working on our side, and publishing is waiting for approval from Meta.

Let your pictures handle themselves

Create a free PostRSS account, connect Instagram, and stop resizing images by hand.