Quick start: Open the free BannerCheck tool, choose the target specification, and add your campaign images. Processing stays in your browser.
A banner can have the right design and still be technically wrong. Its pixel dimensions may not match the booked placement, its file weight may exceed the delivery limit, or the final export may differ from the version the team approved.
These issues are easier to catch before the creative reaches Google Ads, Meta, an agency trafficking team, or a publisher. A consistent technical check reduces repeated exports, last-minute emails, and avoidable campaign delays.
What Is a Banner Checker?
A banner checker compares an advertising image with a selected set of technical requirements. For image creatives, the most useful checks are pixel dimensions, file weight, and file format.
- Dimensions describe image width and height in pixels, such as 300 × 250.
- File size describes how much data the image contains, usually measured in KB or MB.
- Aspect ratio describes the relationship between width and height.
An image can have the correct dimensions but still be too heavy. It can also be small enough to upload while having the wrong proportions for its placement. Checking these properties together shows which creatives are ready and which need another export or a careful repair.
Why Check Banner Dimensions and File Size Before Uploading?
When a campaign contains several formats, opening each image and manually checking its properties becomes repetitive. A banner size checker gives designers and ad operations teams a consistent first review.
Catch incorrect exports
A filename is not proof of an image's dimensions. A file called campaign_300x250.jpg may have been exported at a different size. Reading the actual image properties catches that mismatch before handoff.
Identify oversized files
A visually simple banner can exceed a file-weight limit because of export settings, embedded detail, or an unsuitable format. Finding this early leaves time to compress the image and inspect the result without rushing delivery.
Keep campaign assets consistent
A campaign may include publisher display banners, social images, and responsive advertising assets. Each creative should be checked against its intended destination instead of treating every image as interchangeable.
Meet Pagecores BannerCheck
Pagecores BannerCheck is a free online ad image checker with profiles for Google uploaded display ads, Google responsive and Performance Max assets, common Meta placements, IAB display formats, and publisher formats.
You select a target profile, add the images, and review the technical report. The interface can read JPG, PNG, GIF, WebP, AVIF, and SVG files. A readable format is not automatically accepted by every advertising platform, so the destination's current requirements remain the final reference.
For example, Google's uploaded display specification currently lists GIF, JPG, and PNG files with a 150 KB maximum, while responsive display assets use different ratios and a higher limit. See the official Google uploaded display specifications and responsive display requirements.
Check multiple banner images
Add several images in one session and review the dimensions, file weight, accepted format, nearest target size, and status of every creative. This is more useful for a complete campaign set than checking one export at a time.
Resize and compress suitable banners
BannerCheck can create a corrected version at the nearest accepted dimensions and export it as a static JPEG. Where necessary, it reduces JPEG quality until the image fits the active weight limit.
The result still needs visual review. Changing proportions can distort a composition, while compression can soften small text, legal copy, fine logo details, and product photography.
Download corrected creatives together
You can download one repaired image or create a ZIP containing corrected files and creatives that already passed the selected check.
Process campaign images locally
Image analysis, resizing, compression, and ZIP creation happen locally in the browser. Campaign files are not uploaded to Pagecores for processing.
How to Check Your Ad Banners with Pagecores
- Confirm the destination requirements. Start with the platform or publisher specification. Identify the required dimensions, accepted formats, maximum file size, and any campaign-specific rules.
- Select the relevant profile. Open the online banner checker and choose Google Display, Google responsive, Meta, IAB, or publisher formats.
- Add your images. Drag the banner files into the tool or select them from the device. Multiple images can be checked together.
- Review every result. Compare actual dimensions and file weight with the nearest accepted target. Investigate warnings and errors before repairing anything.
- Repair suitable files. Use automatic resizing or compression only when the change makes sense for the composition. Turning a wide leaderboard into a tall vertical advertisement usually requires a new layout.
- Inspect the final export. Check the headline, logo, product details, disclaimer, and call to action. Then compare the final file with the actual campaign specification.
Common Banner Problems and How to Handle Them
| Problem | What to Check | Practical Next Step |
|---|
| Incorrect dimensions | Actual pixel width and height | Resize if the composition allows it, or export again from the design source |
| File exceeds the weight limit | File size against the placement specification | Compress and review the resulting image quality |
| Text looks blurry | Readability at the intended display size | Adjust export settings or simplify the design |
| Image proportions look wrong | Original and target aspect ratios | Rebuild the layout for the destination format |
| Animation disappears after repair | Whether the source is an animated GIF | Keep the original animation and optimize it separately |
| The tool passes a file but the platform rejects it | Destination-specific requirements and rejection message | Check the platform's current specification and policy rules |
A technical pass is a useful checkpoint. It does not guarantee platform approval or confirm that the advertisement meets every content, tracking, and policy requirement.
How to Reduce Banner File Size Without Sacrificing Readability
The goal of compression is to meet the delivery requirement while preserving the information viewers need. Start with the correct dimensions; exporting an unnecessarily large image and resizing it later adds work without improving the final placement.
Inspect the elements most likely to suffer during compression:
- Small text and disclaimers
- Fine logo details
- Product labels
- High-contrast edges
- Smooth gradients
If a publisher specifies a 200 KB limit and the image is 240 KB, compression may solve the issue without changing the design. Review the exported file at its intended display size. Conversely, an image already well below the limit does not need further compression simply because it can be made smaller.
Important Limits to Understand
BannerCheck focuses on image dimensions, file weight, accepted raster formats, and image repair. It does not replace checks for:
- HTML5 banner code, ZIP structure, or click tracking
- Advertising policies and prohibited content
- Landing-page accuracy
- Placement-specific safe zones
- Campaign setup and live delivery
IAB specifications are industry recommendations, and individual publishers may modify them. IAB explicitly advises advertisers and agencies to confirm creative requirements directly with the publisher. See the IAB New Ad Portfolio.
There is also a difference between checking and repairing animated GIFs. The tool can inspect GIF dimensions and weight, but repair produces a static JPEG from the first rendered frame. Keep the animated original when motion is required. JPEG output also does not preserve transparency.
Who Can Benefit from a Banner Size Checker?
- Ad operations teams can review incoming image creatives before trafficking.
- Designers can verify exports before sending them to a client or media team.
- Agencies can review campaign sets together and organize corrected downloads.
- Small businesses can inspect basic image requirements without manually opening every file's properties.
The shared benefit is a clearer handoff: the next person receives files that have already passed an initial technical review.
Frequently Asked Questions
Is Pagecores BannerCheck free?
Yes. BannerCheck is a free browser-based tool for checking, resizing, and compressing banner images.
Can I check multiple banners at once?
Yes. Add multiple images and review the dimensions, file weight, and status of every creative in one session.
Does it support Google Ads and Meta images?
The tool includes profiles for Google uploaded display ads, Google responsive and Performance Max assets, common Meta placements, IAB units, and publisher formats. Confirm the requirements for the specific campaign before submission.
Can I compress a banner to meet a publisher's limit?
The repair function can reduce JPEG quality to meet the active profile's file-weight limit. Review the exported image to ensure important details remain readable.
Does it preserve animated GIFs when repairing them?
No. GIF repair produces a static JPEG. Use the original file or a separate animation optimization workflow when the banner must remain animated.
Does a successful check guarantee ad approval?
No. Image dimensions and file weight are only part of the review. Platforms and publishers may apply additional technical, content, policy, and campaign requirements.
Check Your Next Banner Set Before Submission
A short technical review can catch incorrect dimensions and oversized files before they create another round of revisions. Use BannerCheck to inspect the creative set, make suitable adjustments, and download the results. Finish with a visual review and the destination's current specification.
Check Your Banner Files Now
Validate Google Ads, Meta, IAB, and publisher image formats privately in your browser.
Open Free BannerCheck
About the author
Pagecores Team creates practical AI solutions, web products, advertising systems, and automation workflows for modern businesses.
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