Thumbn

Spec sheet

What it does

Thumbn watches uploaded or linked video scene by scene, selects a likely high-interest moment, and generates platform-sized thumbnails.Read 15 Oct 2026 · thumbn.so

Product

Thumbn watches video scene by scene, selects a moment, writes a thumbnail concept, and renders images for video platforms.Read 8 Oct 2026 · thumbn.so

Integrations

Thumbn supports bringing Google, OpenAI or Anthropic API keys for rendering billed directly by those providers.Read 15 Oct 2026 · thumbn.so

Privacy

Thumbn says it does not use customer videos or thumbnails to train its own models, sell data, or use it for advertising.Read 8 Oct 2026 · thumbn.so

Support

Support is provided by email at [email protected], with a stated target of one working day for replies.Read 15 Oct 2026 · thumbn.so

Account requirement

Sign-in uses a Google account rather than a separate Thumbn password.Read 15 Oct 2026 · thumbn.so

Account security

Thumbn says user API keys are encrypted at rest and are not shown in the browser after saving.Read 8 Oct 2026 · thumbn.so

API billing

API, MCP and web generations share the same subscription and credit balance, with no separate free API tier.Read 15 Oct 2026 · thumbn.so

API tools

Documented tools include create_thumbnail, get_thumbnail_job, list_thumbnail_jobs, list_image_models, estimate_cost and get_account.Read 15 Oct 2026 · thumbn.so

App-store availability

No iOS, Android or Microsoft Store application listing or rating is stated on the opened Thumbn pages; the product is presented as a web service.Read 15 Oct 2026 · thumbn.so

Authentication

API requests use an x-api-key or bearer token, while MCP uses OAuth 2.1 with authorization-code PKCE and refresh tokens.Read 15 Oct 2026 · thumbn.so

Automatic grading

Each render is scored against a style rubric and re-edited until it clears the stated threshold.Read 15 Oct 2026 · thumbn.so

Availability limitation

The terms provide no uptime guarantee and warn that failures or policy changes at third-party AI providers can disable parts of the service.Read 15 Oct 2026 · thumbn.so

Bring your own keys

Renders using a user's Google, OpenAI, or Anthropic key bill to that provider account instead of using Thumbn credits.Read 8 Oct 2026 · thumbn.so

Cancellation

Subscriptions can be cancelled from the account billing page at any time, with access continuing through the paid period.Read 8 Oct 2026 · thumbn.so

Cancellation and refunds

Subscriptions can be cancelled from the billing page; unused prepaid periods are not prorated, and refunds are offered within 14 days only when no generation has been made unless the service caused the problem.Read 15 Oct 2026 · thumbn.so

Chrome Web Store availability

The opened Chrome Web Store help page explains the store generally, but no Thumbn extension or rating is shown there.Read 15 Oct 2026 · support.google.com

Conversational editing

Users can select a generated thumbnail and describe edits such as larger text, a different background or an arrow in plain language.Read 15 Oct 2026 · thumbn.so

Credit calculation

Video analysis costs 2 credits per job; rendered images cost model-specific rates such as 1 credit for Nano Banana Pro and 2 for GPT Image 2.Read 15 Oct 2026 · thumbn.so

Cross-platform rendering

One run can produce both a 16:9 YouTube image and a 9:16 image for TikTok and Instagram Reels.Read 15 Oct 2026 · thumbn.so

Data deletion

After account closure, projects, uploads and generated images are stated to be deleted within 30 days, while invoices are retained for six years for tax purposes.Read 15 Oct 2026 · thumbn.so

Editing

Users can direct edits to a selected thumbnail, and each version is kept rather than overwriting the previous one.Read 8 Oct 2026 · thumbn.so

Export

Generated versions are downloadable as PNG files.Read 15 Oct 2026 · thumbn.so

Independent discussion

A LinkedIn post associated with Thumbn emphasizes matching thumbnail concepts to video type and warns that misleading thumbnails can hurt viewer retention and trust.Read 15 Oct 2026 · linkedin.com

Independent discussion: design guidance

The same LinkedIn page recommends one dominant subject, strong contrast, a single emotional moment and alignment between title and thumbnail.Read 15 Oct 2026 · linkedin.com

Maker location

The terms say the service is operated from the United Kingdom and provide no registered legal name on the page.Read 15 Oct 2026 · thumbn.so

MCP clients

The developer page documents connections for Claude, Codex, Cursor and other Streamable HTTP MCP clients.Read 15 Oct 2026 · thumbn.so

MCP server

Thumbn provides a Streamable HTTP MCP endpoint at https://api.thumbn.so/mcp.Read 15 Oct 2026 · thumbn.so

Platform sizes

One concept can produce a 1280×720 YouTube image and a 1080×1920 image for TikTok and Instagram Reels.Read 8 Oct 2026 · thumbn.so

Privacy claim

Thumbn says it does not train its own models on customer videos or thumbnails, sell customer data or use it for advertising.Read 15 Oct 2026 · thumbn.so

Rating on Capterra

The opened Capterra homepage describes its software directory and review database but does not display a Thumbn profile or rating.Read 15 Oct 2026 · capterra.com

Rating on G2

The opened G2 homepage shows other software categories and products but does not display a Thumbn profile or rating.Read 15 Oct 2026 · g2.com

Rating on GetApp

The opened GetApp browse page lists software categories and category counts but does not display a Thumbn profile or rating.Read 15 Oct 2026 · getapp.com

Rating on Product Hunt

The opened Product Hunt homepage lists current launches and does not display a Thumbn launch, vote count or review rating.Read 15 Oct 2026 · producthunt.com

Rating on Software Advice

The opened Software Advice homepage presents its directory and review service but does not display a Thumbn profile or rating.Read 15 Oct 2026 · softwareadvice.com

Rating on TrustRadius

The opened TrustRadius homepage shows featured and recently added products but does not display a Thumbn profile or rating.Read 15 Oct 2026 · trustradius.com

Reference images

Projects can include reference images so faces, logos, products or brand colors remain more consistent.Read 15 Oct 2026 · thumbn.so

REST API

A public HTTP API exposes POST /jobs for starting thumbnail jobs and GET /jobs/{id} for polling results.Read 15 Oct 2026 · thumbn.so

Scene analysis

The service analyzes footage with timestamps instead of requiring the user to describe the video manually.Read 15 Oct 2026 · thumbn.so

Scoring

Thumbn scores each render against the selected style rubric and re-edits it until it clears the bar.Read 8 Oct 2026 · thumbn.so

Security of provider keys

User-supplied provider keys are encrypted at rest and are not shown again in the browser after saving.Read 15 Oct 2026 · thumbn.so

Sign-in

Users sign in with a Google account, with no separate password to manage.Read 8 Oct 2026 · thumbn.so

Styles

The service lists styles including MrBeast, cinematic, minimal, documentary, clickbait and aesthetic presets.Read 15 Oct 2026 · thumbn.so

Supported content

The support page lists YouTube including Shorts, TikTok, Instagram Reels and podcast cover art as supported destinations.Read 15 Oct 2026 · thumbn.so

Terms limitation

The terms disclaim guarantees that generated thumbnails will be usable, accurate, unique or improve click-through rate.Read 15 Oct 2026 · thumbn.so

TikTok output

TikTok covers are rendered at 1080×1920 pixels in a 9:16 ratio.Read 15 Oct 2026 · thumbn.so

Version history

Edits create new versions while earlier images remain available for comparison or rollback.Read 15 Oct 2026 · thumbn.so

Video input

Users can paste YouTube, TikTok or Instagram Reels links or upload an MP4 file up to 200 MB.Read 15 Oct 2026 · thumbn.so

YouTube output

YouTube thumbnails are rendered at 1280×720 pixels in a 16:9 ratio.Read 15 Oct 2026 · thumbn.so

Plans and prices

Every Thumbn plan and price →

Where Specifiction places it

• AI Thumbnail Generators#3 of 298.7
• Video Thumbnail Makers#14 of 468.6