Choose one working canvas for the feed
The recommended Instagram feed canvas is 1080 x 1440 pixels, with a 3:4 aspect ratio, according to soona.co's Instagram specifications read on October 31, 2026. Use that canvas as the default when one source asset must serve several accounts, because it gives vertical creative more room without making every post a different shape.
Soona.co lists 1080 x 1080 pixels for square posts, 1080 x 1350 pixels for vertical posts, and 1080 x 566 pixels for landscape posts. Those formats correspond to 1:1, 4:5, and 1.9:1 aspect ratios, respectively, according to soona.co's specifications read on October 31, 2026.
Use the format that matches the creative rather than stretching a square design into a vertical one. Before exporting, check that the intended crop still includes the subject, headline, logo, and any required product detail.
Check the Instagram size range before exporting
Instagram keeps a feed photo at its original resolution when its width is between 320 and 1080 pixels and its aspect ratio is between 1.91:1 and 3:4, according to soona.co's specifications read on October 31, 2026. A source outside that range may be cropped, resized, or enlarged, so inspect the export before sending it to several accounts.
A lower-resolution photo is enlarged to a width of 320 pixels, according to soona.co's specifications read on October 31, 2026. Enlargement cannot restore detail that was removed during export. Check the pixel dimensions and open the file at full size, looking for soft text, jagged edges, and compression around small logos.
For a second set of upload checks, use Instagram post dimensions and upload checks when the export looks correct but the upload still behaves unexpectedly. The useful distinction is simple: dimensions validate the file, while delivery checks validate what Instagram actually received.
Protect text from Instagram interface controls
Keep important creative away from the top and bottom edges because interface controls can cover text, logos, or other details. Leave a generous clear area around those edges before exporting, then preview the image with the account identity and interface controls visible.
Treat the safe area as a design rule, not a final-stage repair. Place headlines and calls to action inside the central region, then preview the image with the account identity and interface controls visible.
Use this short check before exporting:
- Read the headline without relying on the top edge.
- Keep logos away from the lower interface area.
- Check that a crop does not remove a face, product, or key qualifier.
- Review the design on a phone-sized preview.
If an important element fails any check, move it inward and export again. Do not solve an unsafe layout by shrinking every element until the design becomes unreadable.
Prepare carousels as one visual system
A carousel should use one deliberate canvas across its slides so the swipe experience feels continuous. Keep the same pixel dimensions, aspect ratio, margins, and text position unless a slide intentionally breaks the pattern.
Instagram photography can be square, landscape, or vertical, while grid views show images cropped to a 3:4 aspect ratio, according to soona.co's specifications read on October 31, 2026. Check both the individual slide and the first-image thumbnail, because a design that works after swiping may lose its meaning in the profile grid.
For a multi-account workflow, name each slide in order and inspect the first frame separately. A correctly sized file can still create a poor post if the cover is the wrong slide, the sequence is incomplete, or one asset has a different crop.
Select the publishing route by failure risk
Choose a manual upload for occasional posts, a native scheduler for a small number of accounts, or an automated publisher when repeated delivery checks matter more than a single upload. The correct route depends on how many accounts you operate and how costly a silent failure is, not on the image dimensions alone.
Manual uploading gives you the closest visual inspection, but it becomes difficult to audit across many brands. A workflow tool reduces repetition, while an API or command-line route suits operators who already generate assets and captions in a repeatable process. Post to Instagram from the command line when your team needs a scriptable handoff rather than repeated browser work.
Check the route before committing a month of content:
- Confirm who can see the account and approve the post.
- Confirm where the final asset and caption are stored.
- Confirm what evidence proves delivery.
- Confirm what happens after a temporary failure.
If the route only reports that a request was accepted, it does not prove that the post is visible on Instagram. Add a separate verification step.
What are Instagram post sizes in pixels?
Instagram feed posts can be prepared at 1080 x 1440 pixels for the recommended 3:4 format, 1080 x 1080 pixels for square, 1080 x 1350 pixels for vertical, or 1080 x 566 pixels for landscape, according to soona.co's specifications read on October 31, 2026. Use pixels for production because design tools and upload checks can validate them directly.
Inches, centimetres, and millimetres are print measurements and do not determine how a feed post appears on a screen. If a design tool asks for a physical size, set the pixel dimensions first and treat the physical measurement as secondary. Check the exported file's actual pixel width and height rather than trusting the document setup.
The practical ratio check is equally important. Recommended feed posts use 3:4, square posts use 1:1, vertical posts use 4:5, and landscape posts use 1.9:1, according to soona.co's specifications read on October 31, 2026.
Test one illustrative post before scaling it
Test one representative post on one account before distributing the same asset across every client or brand account. A useful illustrative example is a product image with a headline near the top and a call to action near the bottom.
- Export the image and confirm the file dimensions.
- Move the headline and call to action inside the safe areas, then inspect the image on a phone-sized preview.
- Upload the post to a test account and check the feed, profile grid, caption, first frame, and visible crop.
- Compare the live result with the source file and record whether the image stayed sharp and the text remained readable.
- Repeat the check after using the chosen bulk publishing route, because a successful handoff does not prove that the final post is present.
If the live crop cuts off the subject, revise the canvas or focal point before scaling the workflow. If the post is absent, check the delivery record and account permissions before changing the image. For browser-based preparation, How to upload a post on Instagram safely covers the practical upload sequence.
Verify presence after every multi-account delivery
Verify the post on Instagram after publication and keep a record that distinguishes accepted, published, and visibly present. This is the step operators skip most often when a tool says a post was published, and it is the step that catches missing posts before a client or audience does.
PostWharf publishes one post from a web composer, REST API, CLI, or MCP server, and gives every post a delivery receipt per network. Failures retry, published posts are re-checked, owners are emailed on failure, and the figures each network reports back are shown to the operator. For a workflow with many brands, those checks make the publishing record more useful than a single success label.
PostWharf is priced per workspace, meaning one brand, with unlimited channels at $15, $29, $67, or $99 a month and a seven-day free trial. Check the per-brand pricing against the number of workspaces you actually operate before choosing a route, then connect one representative account and confirm that its delivery receipt and re-check match the live post.
Official sources to check
- soona Instagram image specifications (soona.co)
Common questions
What is the Instagram post new size ratio?
Soona.co lists the recommended Instagram feed ratio as 3:4. Square, vertical, and landscape posts use different ratios, so check the exported width and height rather than assuming every feed image uses the same canvas.
What are Instagram post sizes in inches?
Instagram post sizes are best specified in pixels, not inches, because screen display and upload processing depend on pixel dimensions. Soona.co recommends preparing the feed canvas at 1080 x 1440 pixels, then using inches only as a secondary document setting. Inspect the exported file to confirm its actual pixel width and height.
What are Instagram post sizes in cm?
Centimetres do not define the usable Instagram feed size. A physical measurement can vary with resolution while the pixel dimensions remain fixed.
What is the Instagram post size in mm?
Millimetres are a print measurement, so they are not the right primary setting for an Instagram post. Use the pixel canvas and aspect ratio instead, then confirm the export before uploading. For multi-account publishing, also check the live crop and text placement on Instagram because a correctly sized file can still display poorly.
Can I verify Instagram posts after publishing?
Yes. Check the post on the account, review its profile-grid crop, and compare the live result with the source asset. PostWharf gives every post a delivery receipt per network, retries failures, re-checks published posts, emails owners on failure, and shows the figures each network reports back for a post.
PostWharf is priced per workspace rather than per connected channel, and every plan carries unlimited channels. See per-brand pricing.