Support
Most questions are answered below. For anything else — a billing problem, a bug, a refund, deleting your account — email contact@thumbn.so and a human will reply. Writing from the address on your account speeds things up.
Using Thumbn
How do I generate a thumbnail?
Sign in with Google, upload a video file or paste a link, and pick a style. Thumbn watches the footage scene by scene, chooses the most clickable moment, writes the concept and renders it — a 1280×720 image for YouTube and a 1080×1920 image for TikTok and Instagram Reels, from the same run.
Can I change a thumbnail after it is generated?
Yes. Click any thumbnail in the studio to point the agent at it, then describe the change — bigger text, a different background, a red arrow. Each edit produces a new version rather than overwriting the old one, so you can always go back.
Can it use my face, logo or an existing look?
Yes. Attach reference images to a project and the agent keeps faces, logos and products faithful across renders.
Which platforms does it support?
YouTube (including Shorts), TikTok, Instagram Reels and podcast cover art. Every run renders both a 16:9 and a 9:16 image, so the same concept works everywhere.
Is there an API?
Yes — Thumbn has an HTTP API and an MCP server, so you can generate thumbnails from your own tools or from an AI agent. See the developers page for docs and examples.
Credits and billing
How much does Thumbn cost?
Pro is $19 a month for 60 credits and Studio is $49 a month for 175 credits. Monthly plan credits reset each billing period; credits bought as packs never expire.
What uses up credits?
Generations that run on Thumbn's API keys. If you add your own Google, OpenAI or Anthropic key, those renders bill to your provider account instead and stop using credits. Your own keys are encrypted at rest and are never shown in the browser after saving.
How do I cancel my subscription?
From the billing page in your account, at any time. You keep access for the period you have already paid for; you just will not be charged again.
Can I get a refund?
As a consumer you normally have 14 days to change your mind after subscribing. Because generation starts straight away, that right ends once you have generated something — but if you have not generated anything, email us within 14 days and we will refund you. If something went wrong on our side, email us either way and we will sort it out.
A generation failed. Did it still cost credits?
Failed runs should not cost you anything. If you were charged credits for a render that never arrived, email us with the approximate time it happened and we will put the credits back.
Account and data
How do I sign in?
With a Google account. There is no separate password to manage.
Is my video used to train AI models?
We do not use your videos or thumbnails to train our own models, we do not sell your data, and we do not use it for advertising. To render an image your video and prompts are sent to the AI providers listed in the privacy policy.
How do I delete my account and data?
Email contact@thumbn.so from the address on your account. We delete your projects, uploads and generated images within 30 days of closing the account, keeping only what tax law requires (invoices, for six years).
Still stuck?
Email contact@thumbn.so. Include what you were doing, what you expected and what happened instead — a screenshot helps. We aim to reply within one working day, and within one month at most for data-rights requests.
Looking for the fine print? Read the terms of service and privacy policy.