Rule-based Free Tool

Platform Content Rules Checker: LinkedIn Post

Pick a platform and format to see text limits, image/video specs, media-count rules, and source evidence before publishing.

Check publishing rules by format

Choose a platform first, then a format. You can compare up to 3 formats side by side.

Platform
Format

LinkedIn · Post

Hard limits for LinkedIn posts.

Rules version: 2026.04.08-hard-rules-v1
Hard Requirements
Text Rules
Character limit: 3000 chars
Image Rules
Image format: JPG, PNG, GIF
Image file size: Static up to 5 MB, GIF up to 8 MB
Image resolution: No fixed limit
Video Rules
Video format: MP4
Video file size: Up to 500 MB
Video duration: Up to 10 min
Frame rate: Not specified
Media Count Limits
Max images per post: 20
Max videos per post: 1
Mixed media: Yes (image+GIF), no image+video
Carousel supported: Yes
Recommended Settings
Video Rules
Video format: Supported resolution: width 1-4096, height 1-2304; ratio 1:2.4 to 2.4:1

Who Is This For

📲
Social Media Manager
Social Media Managers

Check character limits, media specs, and count restrictions for your target platform and format before posting to prevent publish failures. Make rules lookup a standard pre-publish step to increase operational accuracy.

🏢
Content Team
Brand & Agency Content Teams

Give your whole team a single reference for platform rules during multi-author content production to eliminate inconsistencies and rework. Use the checker to confirm all format requirements are met when publishing the same campaign across multiple platforms.

🌐
Multi-platform Operator
Multi-platform Publishers

When publishing to Instagram, LinkedIn, TikTok, X, and other platforms simultaneously, quickly compare how each platform handles the same format type. Prevent partial publish failures and content truncation caused by overlooked platform differences.

About the Platform Content Rules Checker

Every social media platform enforces different hard limits on character count, media specifications, and publishing constraints. Using a rules checker before publishing helps reduce upload failures, content truncation, and spec mismatches across all your active channels.

01

What Is the Platform Content Rules Checker

The platform content rules checker is a reference tool organized by platform and post format, covering Instagram, TikTok, YouTube, LinkedIn, X, Facebook, Pinterest, and Reddit across major format types including feed posts, Reels, Stories, carousels, Shorts, and more. Each rule entry shows character limits, supported media types, media count limits, and publishing constraints, with source evidence links so you can verify rule accuracy directly against official documentation.

02

Why Pre-Publish Rule Checks Matter

Platform rules differ not just between platforms but across formats on the same platform: Instagram Feed supports up to 10 images per carousel while Reels supports only single video; LinkedIn articles and LinkedIn short posts have character limits that differ by more than tenfold. Relying on memory is error-prone, and looking up rules at the moment of publishing is a more reliable practice that prevents costly re-do cycles.

03

How to Use the Platform Content Rules Checker

Select your target platform such as Instagram, then choose the specific format such as Reels, and the tool displays all key rules for that combination. Multiple formats can be compared side by side to identify constraint differences within the same platform. For rules with source links, click through to verify directly against official documentation and confirm data accuracy.

04

Tips for Managing Multi-Platform Content Rules

Place the rules checker in a fixed position on your pre-publish checklist rather than only consulting it when problems occur. For new team members, the rules tool is an efficient resource for quickly understanding platform differences. When publishing the same content across multiple platforms, check rules individually for each platform — a single spec standard rarely applies across all channels.

Why format-level checks matter

Within the same platform, Post / Reels / Story often follow different constraints.

Reduce rework

Catch hard-limit issues before submission.

Align teams

Keep ops, design, and editors on one rules baseline.

Decide faster

Compare formats side by side before producing assets.

Stay auditable

Every rule includes source links and verification date.

Tips

Treat hard limits as publishing gates and best-practice notes as optimization guidance.
When a platform changes policies, update data version first, then UI copy.
For undocumented fields, use conservative specs to reduce publishing risk.
Always re-check by platform format before cross-posting the same campaign assets.

Execution Best Practices

Turn this checker into a real pre-publish process instead of a last-minute rescue tool.

Gate Before Scheduling

Run format checks before slots are finalized.

Template by Format

Prepare design templates per format to reduce recuts.

Version Every Rule Set

Share rule version in briefs to avoid stale limits.

Weekly Drift Audit

Quickly scan key platform docs for spec changes.

Conservative Fallback

If unclear, ship with the safer constraint set.

Connect to Calendar

Embed constraints into planning templates.

Continue Improving Content Ops

After rule validation, improve copy, assets, and publishing execution.

Caption Length Checker
Validate caption limits and overflow risk.
Image Size Guide Checker
Check ratio and crop safety.
Social Media Content Calendar Template
Apply constraints to weekly/monthly plans.
Publish with SocialEcho
Move validated assets into execution.

Platform Content Rules Checker FAQ

Common questions about coverage, verification, and updates.

Do rules come from official sources?
Each rule set includes source links, confidence level, and verification date.
Why do some fields show as undocumented?
That means public docs do not provide a hard limit. We mark it explicitly instead of guessing.
How often do rules update?
Rule updates are released through versioned data updates with rollback support.
Can this tool publish for me?
No. It is a pre-publish rules checker and comparison tool.

Turn Rule Checks Into Execution

Use SocialEcho to connect constraints, approvals, scheduling, and multi-platform publishing.

Open Publish Workflow

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