Watches your video first
YouTube, TikTok & Instagram Reels Thumbnail Maker & Editor
An AI thumbnail generator and editor that watches your video first.
Most thumbnail makers ask you to describe your video. Thumbn watches it — every scene, with timestamps — finds the most clickable second, and renders it at 1280×720 for YouTube and 1080×1920 for TikTok and Reels. Then you edit it by saying what to change.
Or upload an MP4 up to 200MBPlans from $19/mo, cancel anytime
Both rendered from one video, in one run.
The run
How the thumbnail maker works
Three steps, all visible while they run. Every image it makes is kept.
STEP 1
It watches the whole video
Scene by scene with timestamps, then picks the single second that would stop a scroll — instead of asking you to describe your own footage.
STEP 2
It renders every platform size
One concept becomes a 1280×720 YouTube thumbnail and a 1080×1920 image for TikTok and Instagram Reels.
8.6 / 10
STEP 3
It grades and redoes its own work
Each render is scored against the style's rubric, then re-edited until it clears the bar. Nothing is overwritten.
The studio
Then you direct it
A generator that stops after one image isn't much use. Click any thumbnail to point the agent at it and say what to change.
- Point at one image — the agent edits that exact frame
- Attach your face, logo or a look you want matched
- Every version kept, scored and downloadable as PNG
- Switch style — MrBeast, cinematic, minimal, documentary
Agent
Make the text bigger and add a red arrow
Editing concept 1 — bigger headline, arrow on the vault.
version 5 · scored 9.1
Pricing
Credits only cover our keys
Credits cover renders that run on Thumbn's API keys. Bring your own Google, OpenAI or Anthropic key and those renders bill to your provider account instead. Monthly plan credits reset each billing period; credits bought as packs never expire.
Pro
$19/mo
60 credits a month
- Both image models
- No watermark
- 4 concepts per run
- Full agent studio
Studio
$49/mo
175 credits a month
- Everything in Pro
- Highest monthly allowance
- Credit packs never expire
- Priority rendering
Frequently asked questions
What is an AI thumbnail generator?
An AI thumbnail generator creates video thumbnails automatically instead of you designing them by hand. Thumbn goes further than a text prompt: it watches your actual video, finds the most clickable moment, writes the concept and renders the image.
How does Thumbn make a YouTube thumbnail?
Upload a video file or paste a link. Thumbn analyses the footage scene by scene, picks the peak moment, writes a thumbnail concept in the style you choose, then renders it at 1280×720 for YouTube and 1080×1920 for TikTok and Reels.
Can I edit the thumbnail after it is generated?
Yes. Click any thumbnail to point the agent at it and describe the change — bigger text, a different background, a red arrow. Every version is kept, so you can always go back to an earlier one.
Does the thumbnail maker work for TikTok and Instagram Reels?
Yes. One run produces both a 16:9 image for YouTube and a 9:16 image for TikTok and Instagram Reels, from the same concept.
Do I need my own API keys?
No. Renders run on Thumbn's keys and spend credits from your plan. If you add your own Google, OpenAI or Anthropic key, those renders bill to your provider account instead and stop using credits.
How much does Thumbn cost?
Pro is $19 a month for 60 credits, and Studio is $49 a month for 175 credits. Monthly credits reset each billing period; credits bought as packs never expire.
Your next thumbnail is already in the video.
Give Thumbn the file. It will find it.