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SPECIFICTION
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Thumbium

thumbium.com

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Spec score 7.4 #24 of 29 in AI Thumbnail Generators

Spec sheet

Purpose
Thumbium generates thumbnails from a text prompt for YouTube and Shorts.Read 8 Oct 2026 · thumbium.com
Support
The site lists support at [email protected].Read 8 Oct 2026 · thumbium.com
Editing
Users can describe changes in plain language and ask the AI to edit an existing thumbnail.Read 8 Oct 2026 · thumbium.com
Formats
Projects can use widescreen 16:9 YouTube or vertical 9:16 Shorts sizing.Read 8 Oct 2026 · thumbium.com
Gallery retention
Generated thumbnails remain in the gallery for 30 days and are then deleted automatically.Read 8 Oct 2026 · thumbium.com
Generation costs
The page lists OpenAI costs of $0.04 per thumbnail at Medium quality and $0.16 at High quality.Read 8 Oct 2026 · thumbium.com
Integration
Thumbium uses the user's own OpenAI API key, and image-generation charges are paid to OpenAI.Read 8 Oct 2026 · thumbium.com
Monthly limits
Generation pauses when the package's monthly thumbnail limit is reached and resumes at the start of the next month unless another package is added.Read 8 Oct 2026 · thumbium.com
Reference photos
Users can optionally add subject, product, and background photos for the generated scene.Read 8 Oct 2026 · thumbium.com
Refund policy
The pricing page offers a 14-day money-back guarantee; its refund policy says OpenAI usage charges are separate and not refundable by Thumbium.Read 8 Oct 2026 · thumbium.com
Styles
Users can choose art styles and image types such as Photoreal, Cartoon, Anime, and 3D, or leave the image type on Auto.Read 8 Oct 2026 · thumbium.com
Variations
Thumbium can generate up to four thumbnail variations per request.Read 8 Oct 2026 · thumbium.com
Who it is for
The page describes Hobby for creators posting a few videos monthly, Business for regular uploaders, and Agency for agencies and high-volume channels.Read 8 Oct 2026 · thumbium.com

Plans and prices

Hobby $17, paid once One time; $17 shown as 50% off the normal $34 price 100 thumbnails every month in the current double-credit special · YouTube and Shorts · uses your OpenAI key Read 8 Oct 2026 · thumbium.com
Business $29, paid once One time; $29 shown as 50% off the normal $58 price 200 thumbnails every month in the current double-credit special · YouTube and Shorts · uses your OpenAI key Read 8 Oct 2026 · thumbium.com
Agency $49, paid once One time; $49 shown as 50% off the normal $98 price 500 thumbnails every month in the current double-credit special · YouTube and Shorts · uses your OpenAI key Read 8 Oct 2026 · thumbium.com

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