AI YouTube Thumbnail Maker: 3 A/B Versions from One Frame

Safe zonesFeed sizeMade with this app from one fictional video frame

AReaction + side textPreview

Add a frame to preview this version

Caps

BSubject + top textPreview

Add a frame to preview this version

Caps

CScene + bannerPreview

Add a frame to preview this version

Caps

How Thumbnail Studio works

About 162 credits with the default settingsAbout 1 min

Flow preview

Start from a use case

Three thumbnails for a build videoOpens three versions for “I built a tiny cabin from 1,000 pallets”.

Good for

Making three thumbnail versions to A/B test on one video
Turning a plain video frame into a bold cover with big text and a clear reaction
Making Shorts and RedNote covers that stay clear of the platform's buttons

You provide

The video title
One frame: a still, or a moment picked from your video on your device
Optional: your own big text, expression, colours and background for each version

How it works

Title and platformPaste the title and pick YouTube, RedNote or Shorts. A few strong words from the title become the starting big text.
FrameUpload a still or scrub through your video to the moment you want; the video stays on your device.
Three versionsA, B and C are made at once: a big reaction with side text, the subject with text on top, and the full scene with a text banner.
CheckSafe zones show what the duration badge, hover buttons or Shorts buttons cover; Feed size shows each version at the small sizes people see.
Edit and downloadChange words, colours and casing for free; New background remakes one version. Download all three.

You get

Three thumbnail versionsYouTube JPEG 1280×720 under 2 MB, RedNote PNG 1080×1440 or Shorts PNG 1080×1920, named title_thumb_A_widthxheightEdit later: Edit the text and download again for free, or remake one version's picture
READMETXT with the platform, the names and how to run the A/B test

What it doesn't do

It keeps the person in your frame and never swaps faces or adds other people
It does not upload your video; only the frame you pick is used
It does not write titles for you or predict click rates

What you can do next

Make the video itself in Film Maker
Cut a vertical version for Shorts in Content Factory
Make a matching ad set in Ad Versioning

Credits and time

Each version is one image edit and the button shows the price for all three before you start.
Editing text, checking safe zones and downloading are free.
Three versions with the default settings cost about 162 credits.

How it works

Write the title Paste the video title. A few strong words are picked as the starting big text; change them any time.

Add a frame Upload a still, or open the video and scrub to the moment you want. The video stays on your device; only the chosen frame is used.

Make three versions A, B and C each get their own layout: a big reaction with side text, the subject with text on top, and the full scene with a text banner. One price covers all three.

Check safe zones and feed size See what the duration badge or the Shorts buttons will cover, and how the text reads at the small sizes people actually see in the feed.

Edit and download Change the words, colours or casing for free. New background redoes one version only. Download all three for an A/B test.

YouTube

16:9 · 1280×720

Video thumbnail. Exported as JPEG under 2 MB; the duration badge sits bottom right.

RedNote

3:4 · 1080×1440

Note cover in 3:4. A small icon can sit top right in the feed.

Shorts

9:16 · 1080×1920

Short-video cover. The caption and buttons cover the bottom and the right edge.

Questions

Will it change the person in my frame?

It keeps the same person, face and clothes, and only changes the expression and lighting you pick. It does not add other people or swap faces.

Why three versions?

YouTube's Test & Compare lets you try up to three thumbnails on one video and picks the one with the most watch time. A, B and C differ in layout, expression and colour, so the test tells you something.

Can I change the text after it is made?

Yes. The text is drawn on top of the picture, so editing words, colours, casing or side is instant and free. Only a new background or expression costs credits.

What are safe zones?

Parts of the thumbnail the platform covers: the duration badge and hover buttons on YouTube, and the caption and action buttons on Shorts. A warning appears when your text runs into them.

What sizes do I get?

YouTube 1280×720 JPEG under 2 MB, RedNote covers 1080×1440 PNG and Shorts covers 1080×1920 PNG, named title_thumb_A_widthxheight.

What does it cost?

Each version is one image edit. The button shows the price for all three before you start. Editing text and downloading are free.