Ad image resizer
Turn one banner into every standard ad size and download them all.
Ad creative checker
Drop in your banners and videos to check their size, file weight, length and shape against the specs of Google Display, Meta, Instagram, YouTube, CTV and OTT. Everything is checked in your browser, so your files never leave your device.
Common ad specs at a glance
| Placement | Size | Limits |
|---|---|---|
| Display banners (Google, ad servers) | 300×250, 728×90, 320×50, 300×600, 160×600, 970×250, 336×280, 320×100 | Usually 150 KB or less |
| Facebook & Instagram feed | 1080×1080 (1:1) or 1080×1350 (4:5) | Images up to 30 MB |
| Stories & Reels | 1080×1920 (9:16) | Keep text out of the top 14% and bottom 35% |
| YouTube in-stream | 1920×1080 (16:9) | Non-skippable up to 15–20 s; bumpers up to 6 s |
| CTV & OTT | 1920×1080 (16:9) | Usually 10, 15, 20 or 30 s; MP4 with a high bitrate |
Specs change from time to time and each publisher can set its own. Always check the publisher’s latest spec sheet before final delivery.
Questions
Are my files uploaded anywhere?
No. The checks run inside your browser. Your banners and videos never leave your device.
Why is my banner rejected when the size is right?
The most common reason is file weight: many ad servers and Google Display reject image ads over 150 KB. Use our ad image resizer to make lighter versions.
Can it check the video codec and frame rate?
Browsers don’t reveal the codec or frame rate, so we check what can be measured: size, length, shape, file weight and approximate bitrate. Our ad tag tester shows full details for VAST tags.
What about HTML5 banners?
Test HTML5 and MRAID banners with our ad tag tester, which runs the creative in a sealed frame.
Planning a campaign? Let Team Manzi run it.
CTV, OTT, video pre-roll, display and social campaigns across India, the GCC and South East Asia.