Freedom251 › AI Thumbnail Generators
Thumbium
What Thumbium is
Thumbium is a paid web tool that generates thumbnails from text prompts for YouTube videos and YouTube Shorts. Projects support widescreen 16:9 sizing for YouTube and vertical 9:16 sizing for Shorts. Users can select Photoreal, Cartoon, Anime, or 3D image types, or leave the choice on Auto, and can add subject, product, and background photos to guide a scene. Each request can create up to four variations. Plain-language instructions can be used to edit an existing thumbnail. Thumbium requires your own OpenAI API key, with image-generation charges paid separately to OpenAI: the listed costs are $0.04 per thumbnail at Medium quality and $0.16 at High quality. One-time packages are Hobby at 17.00 USD, Business at 29.00 USD, and Agency at 49.00 USD, each shown at 50% off its stated normal price. The current double-credit special provides 100, 200, or 500 thumbnails every month respectively. Gallery images are deleted after 30 days.
Who it suits
Thumbium is aimed at creators posting a few videos monthly, regular uploaders, and agencies or high-volume channels. It suits users making YouTube or Shorts thumbnails in a browser.
What it does well
- Supports YouTube and Shorts formats
- Up to four variations per request
- Plain-language thumbnail editing
- Optional subject, product, and background photos
- 14-day money-back guarantee
What to know first
- No free plan or free trial
- OpenAI key and usage charges are separate
- Gallery items delete after 30 days
- Generation pauses at monthly package limits
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Hobby | 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 | $17, paid once |
| Business | 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 | $29, paid once |
| Agency | 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 | $49, paid once |
As thumbium.com lists them, read 8 Oct 2026. The maker's own page has the final word.
Verdict
Thumbium provides prompt-based thumbnail creation with format choices, references, variations, and text-directed edits. Budget for both a one-time Thumbium package and separate OpenAI image-generation charges.
Facts from Thumbium's own pages
- Editing
- Users can describe changes in plain language and ask the AI to edit an existing thumbnail. · thumbium.com, 8 Oct 2026
- Formats
- Projects can use widescreen 16:9 YouTube or vertical 9:16 Shorts sizing. · thumbium.com, 8 Oct 2026
- Gallery retention
- Generated thumbnails remain in the gallery for 30 days and are then deleted automatically. · thumbium.com, 8 Oct 2026
- Generation costs
- The page lists OpenAI costs of $0.04 per thumbnail at Medium quality and $0.16 at High quality. · thumbium.com, 8 Oct 2026
- Integration
- Thumbium uses the user's own OpenAI API key, and image-generation charges are paid to OpenAI. · thumbium.com, 8 Oct 2026
- 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. · thumbium.com, 8 Oct 2026
- Purpose
- Thumbium generates thumbnails from a text prompt for YouTube and Shorts. · thumbium.com, 8 Oct 2026
- Reference photos
- Users can optionally add subject, product, and background photos for the generated scene. · thumbium.com, 8 Oct 2026
- 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. · thumbium.com, 8 Oct 2026
- Styles
- Users can choose art styles and image types such as Photoreal, Cartoon, Anime, and 3D, or leave the image type on Auto. · thumbium.com, 8 Oct 2026
- Support
- The site lists support at [email protected]. · thumbium.com, 8 Oct 2026
- Variations
- Thumbium can generate up to four thumbnail variations per request. · thumbium.com, 8 Oct 2026
- 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. · thumbium.com, 8 Oct 2026
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