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SPECIFICTION
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ThumbGen

thumbgen.yt

From $9.99/mo Free plan Web
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Spec score 8.0 #9 of 29 in AI Thumbnail Generators

What it is

ThumbGen creates YouTube thumbnails from a written prompt, with the option to add reference images. It is a web service, and its output is prepared for YouTube’s 16:9 aspect ratio. FAST produces 1K images, while PRO offers 2K and 4K resolutions. Users can upload as many as eight reference images; each uses one credit. The service also supports creating several variations in one batch. ThumbGen says most images take 10–30 seconds to generate, depending on complexity and resolution. FAST 1K costs 8 credits per image; PRO costs 30 credits at 2K or 55 at 4K. The free plan is free, billed $0 one-time, and includes 150 credits. Starter costs $9.99 a month and includes 1,000 credits monthly; Creator costs $24.99 a month and includes 2,700. Credits reset each billing cycle and unused credits do not roll over. Subscriptions can be canceled anytime, with access through the billing period; subscription payments and unused credits are nonrefundable unless the law requires otherwise. Google sign-in is available, and support and privacy requests go through a contact form.

Spec sheet

Purpose
ThumbGen generates AI-powered YouTube thumbnails from a written prompt and optional reference images.Read 4 Oct 2026 · thumbgen.yt
Support
The site directs users to a contact form for support and privacy requests.Read 4 Oct 2026 · thumbgen.yt
Batch generation
The site says users can create multiple thumbnail variations at once.Read 4 Oct 2026 · thumbgen.yt
Cancellation and refunds
Subscriptions can be canceled anytime with access through the billing period; subscription payments and unused credits are nonrefundable unless required by law.Read 4 Oct 2026 · thumbgen.yt
Credit costs
FAST 1K costs 8 credits per image; PRO costs 30 credits at 2K or 55 credits at 4K.Read 4 Oct 2026 · thumbgen.yt
Credit expiry
Credits reset each billing cycle, and unused credits do not roll over.Read 4 Oct 2026 · thumbgen.yt
Data deletion
The privacy policy says users can request data access or deletion by contacting ThumbGen.Read 4 Oct 2026 · thumbgen.yt
Generation time
The site says most thumbnails generate in 10–30 seconds, depending on complexity and resolution.Read 4 Oct 2026 · thumbgen.yt
Image resolutions
It offers FAST 1K output and PRO 2K or 4K output, with images optimized for YouTube’s 16:9 aspect ratio.Read 4 Oct 2026 · thumbgen.yt
Integration
The sign-in page offers Google sign-in.Read 4 Oct 2026 · thumbgen.yt
Privacy and data
The privacy policy says it collects account details, billing information handled by its payment processor, usage data, and support messages; it shares data with service providers for hosting, analytics, and payments.Read 4 Oct 2026 · thumbgen.yt
Reference images
Users can upload up to 8 reference images, and each reference image costs 1 credit.Read 4 Oct 2026 · thumbgen.yt
Security and compliance
The privacy policy says service providers process data on ThumbGen’s behalf under appropriate safeguards; it does not name a security certification or compliance standard.Read 4 Oct 2026 · thumbgen.yt

Plans and prices

Free Free $0 one-time 150 credits · up to 18 thumbnails · up to 4K · reference images Read 4 Oct 2026 · thumbgen.yt
Starter $9.99 a month $9.99 per month 1,000 credits/month · up to 125 thumbnails/month · up to 4K · reference images · priority generation Read 4 Oct 2026 · thumbgen.yt
Creator $24.99 a month $24.99 per month 2,700 credits/month · up to 337 thumbnails/month · up to 4K · reference images · priority generation Read 4 Oct 2026 · thumbgen.yt

Every ThumbGen plan and price →

Strong points and limits

Strong points

  • Supports FAST 1K and PRO 2K or 4K output.
  • Accepts up to eight reference images.
  • Can generate multiple variations at once.
  • Free plan includes 150 credits.

Limits

  • Each reference image uses one credit.
  • Unused credits do not roll over.
  • Subscription payments are generally nonrefundable.

Who it suits

ThumbGen suits people making YouTube thumbnails from prompts who want to specify an image style with reference images. Its free plan offers a way to start, while paid plans add monthly credits and priority generation.

Verdict

ThumbGen offers prompt-based thumbnail creation with multiple resolutions and batch variations. Check the credit cost for each resolution and the monthly reset terms when choosing a plan.

Where Specifiction places it

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