Thumby - AI Thumbnail Maker

Thumby is the AI agent that does the thumbnail work for you.

Most AI thumbnail generators hand you a blank prompt box and wish you luck. Thumby flips it. Type your video topic in one sentence, optionally attach a reference photo, and the agent does the rest: it picks the composition that fits your niche, applies the 2026 YouTube CTR rules (one focal subject, three words of text at most, readable on a phone screen), writes the image prompt itself, and hands back a finished 16:9 thumbnail in about a minute.

If you have ever opened a thumbnail maker, stared at 400 templates and closed it again, this is the app for that problem.

WHAT MAKES IT DIFFERENT

A thumbnail maker that designs, not one that decorates. There are no layers to nudge and no stickers to hunt for. You describe the video the way you would describe it to a friend, and the AI thumbnail generator handles composition, contrast, lighting and text placement.

20 niche styles modelled on what top channels actually do. Gaming, tech reviews, tutorials, vlogs, finance, food, fitness, kids — each style carries the framing and colour language that already works in that corner of YouTube, including the bold, high-contrast clickbait thumbnail look when that is what the video needs.

Your face in every style. Upload one reference photo and stay recognisable across your whole channel, so a viral thumbnail still looks like your channel and not like stock art.

Built-in 2026 YouTube rules. Mobile-first readability, a single clear subject, and text kept short enough to survive being shrunk to the size of a postage stamp in the feed.

BEYOND YOUTUBE THUMBNAILS

The same agent makes Instagram posts and Instagram stories, Pinterest pins and YouTube community posts, each in the right aspect ratio with the platform's safe zones respected. One description, the format you choose, a finished image. The Instagram and Pinterest formats use the same style library as the YT thumbnail work, so a launch keeps one look across every surface.

Upscale any result to 2K or 4K when you need a crisp video thumbnail or cover for a bigger surface.

HOW IT WORKS

1. Describe your video in one sentence.
2. Pick a style, or let the agent pick one for you.
3. Attach a photo of yourself if you want to be in the thumbnail.
4. Get a finished YouTube thumbnail in about a minute, then save or share it.

A push notification tells you the moment a render is ready, so you can put your phone down while it works.

MADE FOR CREATORS WHO SHIP

Thumby is for the creator who publishes on a schedule and does not have a designer. It is a thumbnail creator for people whose real job is making the video, not fighting a design tool at midnight before an upload. You own every image you generate, commercial use included.

Whether you are starting a channel and need your first YouTube thumbnail, or you are twelve hundred videos in and want a faster thumbnail generator that still looks like you, the workflow is the same three steps every time. Nothing to learn, nothing to install beyond this app.

PRICING

3 free credits when you sign up, no card required. After that, pay-as-you-go credit packs. No subscription, and credits never expire.

Questions or feedback? support@thumby.app