If you have ever sent a designer a brief and gotten back something that looked nothing like what you imagined — or received a finished asset that turned out to be the wrong size — you already understand the problem this article addresses.
Most creative miscommunications in social media work are not caused by bad designers or unclear ideas. They are caused by incomplete briefs. Specifically, briefs that assume the designer knows which platform, which placement, and which size — when often, they do not.
This guide is for marketers, brand managers, and project managers who need to brief social media creative work without becoming design experts themselves.
Why Specs Belong in the Brief, Not the Review
The instinct for many marketers is to leave specs to the end — to focus the brief on the idea and creative direction, and trust the designer to figure out the technical details.
This creates predictable problems. The designer picks a size that works for one placement but not others. The finished asset has to be resized, which often means reworking the entire layout. Text that was carefully positioned in the original design ends up cropped or covered by UI overlays in the resized version. Everyone loses time going back and forth.
Providing specs upfront does not constrain creativity. It gives the designer the boundaries they need to make decisions that actually work in production. A designer who knows the final output is an Instagram Story at 1440 × 2560 pixels will make fundamentally different layout choices than one who assumes they are designing a square feed post at 1080 × 1080. Both can produce excellent work — but only if they know which one they are designing for.
The Information Your Brief Must Include
1. The Platform and Placement
Do not just say “Instagram.” Say “Instagram Reels” or “Instagram feed post (vertical, 4:5)” or “Instagram Story.” These are different canvases with different safe zones, different UI overlays, and different audience behaviours.
Instagram alone has at least a dozen distinct format types: square feed posts at 1440 × 1440, vertical feed posts at 1080 × 1350, landscape posts at 1080 × 566, Stories and Reels at 1440 × 2560, carousels in both square and vertical, plus multiple ad placements. Saying “Instagram” leaves the designer to guess which of these you need.
If the asset needs to run across multiple platforms, list each one separately. A Facebook Story and an Instagram Story are both 1440 × 2560 at 9:16, but LinkedIn and X use completely different formats. Being explicit about every destination upfront prevents the assumption that one master file will work everywhere.
2. The Dimensions and Aspect Ratio
Provide both the pixel dimensions and the aspect ratio. For example:
Canvas: 1440 × 2560px (9:16)
Or:
Canvas: 1080 × 1350px (4:5)
Providing both helps catch errors immediately. If a designer receives a file that is 1440 × 2560 but the brief says 1:1, they know something is off and can ask before investing hours in the wrong layout.
To give a sense of the range involved: TikTok In-Feed Videos are 1080 × 1920 at 9:16. LinkedIn single image ads support 1:1 at 1200 × 1200, 1.91:1, or 4:5. Pinterest Standard Pins use 2:3 at 1000 × 1500. Facebook covers are 851 × 315. Each format has its own logic, and assuming the designer has all of these memorised — and knows which one applies — is where briefs go wrong.
3. The Safe Zone
This is the single most commonly omitted piece of information in creative briefs, and it is the one most likely to cause last-minute rework.
Every platform places UI elements — buttons, icons, captions, navigation bars — over parts of your content. The safe zone is the area of the canvas where content will always be visible, regardless of the platform’s interface.
For Instagram Stories and Reels, the safe zone keeps critical elements at least 250px from the top and 340px from the bottom. For TikTok In-Feed Ads, the bottom overlay is even more aggressive. For YouTube channel art, there is a specific central safe zone of approximately 1546 × 423 pixels out of the full 2560 × 1440 canvas — everything outside that area may be cropped on mobile.
When briefing, describe the safe zone in pixels, or attach a template with the safe zone already marked. Most spec tools let you download an SVG template with the safe zone visualised. Attaching this to your brief takes thirty seconds and saves potentially hours of revision.
4. Image or Video (and Duration if Video)
State it explicitly:
Format: Static image (JPG or PNG, up to 30MB)
or
Format: Video (MP4, 15–30 seconds, H.264, with captions)
If it is a video, specify whether audio will be present and whether captions are required. Designing a video that will be watched silently requires different choices than one where the voiceover carries the message.
5. File Type and Size Limit
Different platforms have different maximums. Instagram image posts accept up to 30MB. X (Twitter) image posts cap at 5MB. Reddit promoted posts max out at 3MB for images. Pinterest allows up to 20MB for standard image pins.
If your designer exports a 45MB PNG but the platform cap is 5MB, the file will either be rejected or auto-compressed on upload — often with visible quality loss. Include the file type and size limit in the brief. Your designer should not have to look this up.
6. Number of Deliverables
Be specific. If you want the same concept adapted for three formats, list all three with dimensions. If you want size variations, name them. Discovering mid-project that three more sizes are needed leads to rushed work and avoidable stress.
What Good Brief Language Looks Like
Here is a brief section that gives a designer everything they need:
Platform: Instagram Stories and Reels
Dimensions: 1440 × 2560px (9:16)
Safe zone: All text and logos must sit at least 250px from the top edge and 340px from the bottom edge
Format: Video, maximum 15 seconds, MP4, H.264, stereo AAC audio at 128kbps
File size: Under 200MB
Deliverables: 1 × Story/Reel (1440 × 2560px), 1 × cover image (1080 × 1080px)
Compare that to:
Can you make us an Instagram video?
Both briefs might reach the same designer. Only one will produce an asset that works without revision.
When You Are Briefing Different Types of Collaborators
An experienced agency creative team likely has its own spec library and will flag issues proactively. But even experienced teams benefit from explicit specs — it reduces the chance of early assumptions compounding into late problems.
An in-house designer who works across many projects may not specialise in social media formats. Providing specs removes the need for them to research platform requirements while managing a full workload.
A freelancer on a one-off project almost certainly needs you to provide specs. Do not assume they have current specs for every platform placement memorised. Even skilled freelancers work across enough different contexts that they may have outdated information for a format they use infrequently.
The Real Cost of Getting This Wrong
A last-minute resize is rarely just a technical operation. When a design has to be adapted to a different canvas size — especially from landscape to portrait or vice versa — the layout often needs to be rethought entirely. Typography repositioned. Imagery reframed. Safe zones that invalidate the original composition.
What looks like a five-minute fix frequently becomes a two-hour redesign. And if the discovery happens the day before a campaign launch, that time pressure creates exactly the conditions where quality suffers.
The brief is the cheapest place to solve this problem. A few extra lines of information at the start of a project are worth more than the hours spent fixing avoidable mistakes at the end.
Final Thoughts
Briefing creative work well is a learnable skill. You do not need to be a designer to include “1440 × 2560px (9:16), safe zone 250px top / 340px bottom, MP4 under 200MB” in a brief.
What you need is the habit of including it every time — so your designers can focus their energy on making something good, rather than figuring out what they are supposed to be making.