Free ad preflight

Preflight every ad before you upload it

Validate HTML5 banners, fix clickTags, get under file limits, and check safe zones and specs for Meta, TikTok and YouTube. Client files never leave your browser. No account.

Check a banner Preview safe zones

Drop an ad file to check it

Or a whole campaign folder. Checked in this browser, nothing is uploaded.

Video or imagesafe zones for TikTok, Reels, Shorts and more
Banner ZIP, GIF, audio or a folderone full preflight report

18 focused tools Private files stay on device Free no account required

The toolkit

Everything needed between creative and launch.

Open the exact task you need. No account, project setup or upload queue.

Build and optimize

Prepare HTML5 creative and remove the problems that block trafficking.

ALLCampaign PreflightDrop a whole campaign folder or ZIP and get one QC report for every banner, video and image in it.NEW QCHTML5 Banner ValidatorCheck clickTag, file limits, dimensions and common packaging errors. ZIPBanner CompressorReduce image weight inside a ZIP without changing file paths, and bring GIFs under 150 KB. </>clickTag EditorInspect, add or remove clickTags across an existing banner package. TAGclickTag GeneratorGenerate platform ready code and repair common implementation mistakes. TXTAd Copy CheckerCount headlines and descriptions the way each ad network does, with policy checks before you paste.NEW

Preview and deliver

See the creative in context and export the assets a delivery team needs.

SZSafe Zone CheckerPreview TikTok, Reels, Shorts and Snapchat overlays on real media. SPECAd Spec CheckerDrop a video or image and see which placements it passes: size, length, codec, frame rate and audio. 9:16Video ReframeTurn a 16:9 master into 9:16, 4:5 or 1:1 with keyframed crops and the safe zone on top.NEW LUFSLoudness MeterMeasure integrated loudness and true peak against EBU R128, ATSC A/85 and streaming targets.NEW UILive Social MockupReview creative inside a realistic social interface with caption behavior. PNGSafe Zone PNG MasksDownload transparent editing guides for popular social placements. 16:9Aspect Ratio CalculatorCalculate dimensions, scaling and letterbox padding without guesswork. FRMVideo Frame ExtractorSave any video frame as a full resolution PNG or JPG, or as a backup image.

Measure and learn

Build clean tracking and find the specifications behind each decision.

UTMUTM BuilderCreate consistent campaign URLs and catch broken attribution details. QRQR Code GeneratorQR codes and barcodes that are decoded again before export, with UTM and app store links. VASTVAST InspectorValidate VAST 2.0 to 4.3 tags, follow wrappers and review media files and trackers.NEW SPECAd SpecificationsUse a practical reference for current social and display requirements.

Built for real handoffs

Fewer tabs. Fewer avoidable rejections.

AdCheckLab brings production checks into a single browser workspace. Start with a file, make the decision and move the creative forward.

Private by designCreative files stay in browser memory and never enter an upload queue.

No setup taxOpen a tool and work immediately without an account or workspace configuration.

Focused decisionsEach tool answers one practical delivery question clearly.

Built by Filip Đorđević.

AdCheckLab grew from daily work in digital marketing and ad operations, where small creative mistakes cause slow approvals and rejected uploads.

Why I built it LinkedIn

Practical guides for creative delivery.

Browse all guides

Creative QA review materials arranged on a studio desk

HTML5 QAHTML5 banner QC checklist for ad operationsValidate the package before trafficking. Social creativeTikTok safe zone dimensions and overlay guideKeep essential content clear of platform UI. MeasurementUTM parameters for paid media campaignsBuild links that produce cleaner reporting.