Social Media Image Size Guide Online — Every Platform's Dimensions in One Free Tool

CodexFuse Team · 2026-11-05T22:27:14.791Z · 10 min read min read

Check every platform's image sizes in one place — Instagram, Facebook, X, LinkedIn and Pinterest — with a free fit checker. No guessing, no cropped posts.

A social media image size guide lists the exact pixel dimensions each platform expects for every placement — profile photos, posts, stories, covers and banners — so your images appear sharp, complete and uncropped. The free CodexFuse guide puts those official sizes in one place and adds a fit checker: enter your image's dimensions and it shows exactly where your file fits and where it would be cropped.

That matters because every platform crops differently. A photo that looks perfect on Instagram can lose its headline on Facebook, and a LinkedIn banner made from the same file can slice off the top and bottom. This guide explains the sizes that matter most, how to check any image in seconds, and what to do when one photo has to serve five platforms.

What Is a Social Media Image Size Guide?

A social media image size guide is a reference that lists the official pixel dimensions each social platform requires for each image placement, from profile photos to stories, covers and banners. It exists because every platform displays images at different sizes and aspect ratios, so one file rarely fits everywhere. The CodexFuse guide covers 18 official specs and includes a fit checker that tests your image against each placement before you post.

Think of it as a measuring tape for your content. Instead of uploading, waiting, and discovering your logo is cut off, you check first. The guide tells you the target dimensions; the fit checker tells you whether your file reaches them without an awkward crop.

Why Do Wrong Image Sizes Hurt Your Posts?

A wrong size is not a cosmetic problem. It changes what people actually see, and it changes whether they stop scrolling.

• Cropped headlines and logos: platforms centre-crop by default, so text near the edges of your image is the first thing to disappear.
• Blurry, upscaled images: a 600-pixel-wide image stretched into a 1080-pixel slot looks soft, and soft images read as unprofessional in under a second.
• Hidden story content: stories and reels overlay buttons, captions and profile details on the top and bottom edges, covering anything placed there.
• Inconsistent branding: a cover that fits on desktop but crops badly on mobile makes a business look careless before anyone reads a word.

The fix is cheap: check the size before you post. It takes less than a minute, and it removes an entire category of avoidable mistakes from your publishing routine.

Social Media Image Sizes at a Glance

These are the most-used placements and their commonly published dimensions. Treat them as a starting point — the guide itself holds the full official list of 18 specs, and it is the place to check when a platform updates a number.

How to Use the CodexFuse Size Guide in 3 Steps

The guide is deliberately simple. There is no design software to learn and nothing to install — you check a size, test your image, and move on.

1. Find your platform size: open the social media image size guide and pick the platform and placement you are posting to. The official dimensions for that placement are listed straight away.
2. Enter your image size: type in your image's width and height in pixels, or use the upload reader to read the dimensions from the file itself — useful when you are not sure what size a downloaded or exported image actually is.
3. See where it fits: the fit checker shows which placements your image suits and where it would be cropped, so you can decide whether to post as-is, re-crop, or resize before uploading.

One honest note: the tool asks you to sign in with a free CodexFuse account before you can use it. The account costs nothing, and it is the same account that unlocks the rest of the platform's free tools — but if you only want a quick one-off lookup, the size table on this page covers the most common placements without signing in anywhere.

Worked Example: One Photo, Five Platforms

Maya runs a small home bakery and photographs every cake herself. Her best photo of a pistachio layer cake is 4000 × 3000 pixels — a 4:3 landscape shot with the cake centred and the bakery's name piped in icing across the top. She wants to use that one photo for an Instagram post, an Instagram story, a Facebook cover, a LinkedIn banner and a Pinterest pin. Here is what the fit checker tells her.

• Instagram square post (1080 × 1080): the photo must be cropped to 3000 × 3000, losing 500 pixels from each side. The cake survives, but the icing text at the top edge is at risk.
• Instagram portrait post (1080 × 1350): the crop is 2400 × 3000, so 1600 pixels of width disappear. The cake still fits, but the background context is gone.
• Instagram story (1080 × 1920): the crop is 1687 × 3000 — more than half the width is cut. The cake fills the frame, but nothing else survives.
• Facebook cover (820 × 312): the crop is 4000 × 1522, so nearly half the height is lost. The icing text across the top is cut off completely.
• LinkedIn banner (1584 × 396): the crop is 4000 × 1000, losing two-thirds of the height. Useless for this photo.
• Pinterest pin (1000 × 1500): the crop is 2000 × 3000, losing half the width — but the cake itself is centred, so this one works.

The lesson is not that Maya's photo is bad. It is that one landscape photo cannot serve five shapes. Her fix takes ten minutes: she keeps the original for Pinterest and the Instagram square, shoots a vertical version for stories, and designs a separate wide banner with the bakery name placed safely in the centre. If you are starting from an existing image instead, the CodexFuse social media image resizer reshapes it to each platform's preset without guessing the numbers.

What the Size Guide Does Not Do

A size guide is a measuring tool, not a design studio. Being clear about that saves you from expecting the wrong thing from it.

• It does not resize or crop your images: it tells you the target dimensions; reshaping the file is a separate step. Use the image resizer for that, with the guide's numbers as your targets.
• It does not design your graphics: it will not lay out text, choose fonts or build a banner. For a LinkedIn banner, the LinkedIn banner maker handles the 1584 × 396 canvas directly.
• It does not improve image quality: a low-resolution file stays low-resolution. Check print and display sharpness separately with the image DPI checker before you publish anything important.
• It does not write your captions: sizes are only half the post. If you need story ideas that match the format, the Instagram story idea generator is built for exactly that.
• It does not track platform changes for you: specs change, and a saved screenshot of a size table goes stale. Re-check the guide itself before any important campaign rather than trusting an old note.

Getting Your Images Live Without the Hassle

Checking sizes is one step in a longer chain: shoot, size, resize, upload, publish, and keep the website behind it all running. That chain is where most small businesses lose time — not on the creative work, but on the babysitting around it.

This is the part CodexFuse is built for. Your site, your business email and your files live on one fully managed platform that runs on credits, with no subscriptions and no server to maintain. The practical workflow is simple: create a free CodexFuse account, check your dimensions in the size guide, resize with the image tools, then upload the finished images to the website CodexFuse hosts for you. When you need a quote graphic for the same campaign, the quote image maker builds it in the same place.

Credits keep the cost honest. You pay for what you actually use — hosting, email, tools — instead of a monthly subscription that charges you the same whether you post twice or two hundred times. If you outgrow the free tools, the same account scales with you; nothing needs migrating.

Frequently Asked Questions

What size should an Instagram post be in 2026?

A square Instagram post is 1080 × 1080 pixels, and a portrait post is 1080 × 1350 pixels. Portrait posts take up more screen space in the feed, so they typically perform better for photography — but either way, upload at exactly those dimensions to avoid compression artefacts.

What is the best size for a Facebook cover photo?

A Facebook cover photo is 820 × 312 pixels on desktop. Keep important text and logos in the centre of the image, because mobile crops the sides — the safe area is roughly the middle 640 pixels wide.

What size is a LinkedIn banner?

A LinkedIn banner is 1584 × 396 pixels, a 4:1 ratio. It is one of the widest placements on any platform, so a normal photo will lose most of its height to cropping — design the banner for that wide shape rather than cropping a square image into it.

How do I check if my image fits a platform?

Enter your image's width and height into the fit checker in the CodexFuse social media image size guide, or upload the file and let the upload reader detect the dimensions. It shows which placements your image fits and where it would be cropped.

Is the CodexFuse size guide free?

Yes, it is free and unlimited. You need a free CodexFuse account to open the tool, but there is no charge for checking sizes, and no limit on how many images you test.

Do image sizes change often?

Platforms change specs more often than most people expect — a story safe zone here, a cover ratio there. Check the guide itself before an important campaign instead of trusting a size table you saved months ago.

Your Next Post Deserves the Right Size

Wrong sizes are a silent tax on every post: cropped headlines, blurry images, banners that cut your business name in half. None of it is hard to fix — it just needs a thirty-second check before you hit publish. Open the free CodexFuse size guide, test your next image against the platform you are posting to, and fix the crop before your audience ever sees it. Then move the rest of the hassle — your hosting, your business email, your security and backups — onto CodexFuse, where it is fully managed on credits and you never babysit a server again.