What's the Maximum File Size for a LinkedIn Single Image Ad?

LinkedIn caps single image ads at 5MB per file. The format accepts JPG, PNG, or GIF files, per LinkedIn Marketing Solutions' official single image ad specifications.

Dimensions Matter Almost as Much as File Size

A file under 5MB can still perform poorly if it doesn't match LinkedIn's recommended dimensions. LinkedIn's own specs recommend:

• 1200 x 628 pixels for a 1.91:1 landscape image, the format most consistently rendered across desktop and mobile feeds.
• 1200 x 1200 pixels for a 1:1 square image, which LinkedIn notes tends to take up more vertical space in the mobile feed than landscape creative.
• Vertical aspect ratios are supported for some placements but render less predictably across every surface than the landscape and square options.

Because LinkedIn compresses and resizes images that don't match these dimensions, an oversized or oddly cropped source file can still upload successfully under the 5MB cap while displaying with unwanted cropping in the feed.

Why 5MB Is Generous Compared to Other Platforms

A 5MB ceiling is roomy relative to some other ad platforms' static image limits — Google Ads' legacy uploaded display ad format, for comparison, caps static images at just 150KB. LinkedIn's higher allowance reflects that single image ads are typically a single finished creative file rather than one of several assets assembled automatically, so there's less pressure to keep file weight minimal for combinatorial testing.

What Happens If a File Exceeds 5MB

LinkedIn's Campaign Manager rejects the upload outright rather than auto-compressing an oversized file. The ad simply won't save until the image is resized or compressed below the 5MB threshold — there's no override or exception process for this limit.

Getting Under 5MB Without Losing Quality

• Export at the recommended 1200 x 628 or 1200 x 1200 dimensions rather than uploading a much larger source file and letting LinkedIn scale it down, since oversized source files are the most common reason an export crosses 5MB.
• Use JPG over PNG for photographic images, since PNG's lossless compression produces substantially larger files for photo-heavy creative without a visible quality benefit at ad size.
• Run the export through a dedicated image compressor set to a moderate quality level before upload, which typically cuts file size well below 5MB with no visible loss at feed resolution.

This Limit Is Specific to the Single Image Format

LinkedIn's other ad formats carry their own separate specifications rather than sharing the single image ad's 5MB ceiling. Carousel ads, video ads, and document ads each have different file size and format rules tied to how that format is rendered, so a creative team producing assets across several LinkedIn formats at once needs to check the spec for each format individually rather than assuming one file-size rule applies account-wide.

Bottom Line

Design LinkedIn single image ad creative at 1200 x 628 or 1200 x 1200 pixels and export as a compressed JPG — doing so keeps files comfortably under the 5MB cap without the cropping or quality issues that come from forcing an oversized source file to fit.

Source: LinkedIn Marketing Solutions Help, "Single image ads advertising specifications" (linkedin.com/help/lms/answer/a426534).