Astorie Logo

AI thumbnail generator

Create a video-cover concept from a brief or reference image. Use the generator below to explore a clear focal point, then crop the square image and add your final headline for the publishing platform.

Create a thumbnail

Describe the subject and visual hook for your video cover. Start with a thumbnail preset, adjust the prompt, and generate an image concept to review. Preset examples use the Product reference input.

From a thumbnail generator to a cover workflow

A folder of isolated cover ideas can hide the decisions behind each version. Keep the source and the developing image together while you decide which direction fits the episode; illustrations show workflow concepts, not tested tool results.

A standalone file workflow

  • Start with an isolated cover concept
  • Reassemble the brief for another direction
  • Judge the image apart from its source
Concept illustration: isolated print depicting a cyclist in an orange jacket on an alpine trail

The job in an Astorie project

  • Keep the cover in a canvas project
  • Develop another direction from the saved setup
  • Review the concept beside its reference
Concept illustration: A neatly arranged connected group of three prints depicting a cyclist in an orange jacket on an alpine trail from different useful framings

How to make a video thumbnail in 3 steps

Use the form above to create a square image concept, then prepare the final crop and typography for your video platform.

  1. 1

    Choose a cover direction

    Select a thumbnail preset or describe your episode in the prompt. Name one main subject and the visual hook that accurately represents the video.

    Concept illustration: source print of a cyclist in an orange jacket on an alpine trail, with a small matching reference card beside it
  2. 2

    Edit the prompt

    Describe the subject, background and space for a headline. Add an optional reference image if useful. This form has fixed square output; keep the focal point clear enough to crop later.

    Concept illustration: Two alternate framings of a cyclist in an orange jacket on an alpine trail as prints side by side, a small lavender selection token between them
  3. 3

    Generate and prepare the cover

    Select Generate thumbnail. Inspect the result at a small display size, then crop it to the destination dimensions and add the final headline in your design workflow.

    Concept illustration: chosen print of a cyclist in an orange jacket on an alpine trail with a magnifying glass over a small detail, review and selection concept

What the thumbnail generator does

Build the cover around its subject first, then decide how it should occupy the image.

Describe the video topic

Describe the video's topic, main subject and visual hook in the prompt above. Generate a cover concept that gives the final design a clear starting point.

Open the canvas

Guide the main subject

Add an optional reference image of a presenter or product you have permission to use. Compare recognizable details with the source after generation.

Open the canvas

Place the focal point

Describe where the subject should sit and what the background should contain. Request space for later text placement when that matters to your cover layout.

Open the canvas

Compare creative directions

Adjust the prompt to compare different framing, backgrounds, or visual emphasis. Review the versions before choosing a direction for your final video cover.

Open the canvas

Prepare the final format

The generator produces a square image with fixed settings. Crop the selected concept to your platform requirements and add editable typography in your design workflow.

Open the canvas

Connect the next image task

A selected cover image can feed another compatible canvas operation. For example, carry the chosen composition into a separate enlargement step after the creative direction is settled.

Open the canvas

Thumbnail prompt examples

Adapt these briefs in the prompt field above. The pictures illustrate creative directions; they are not measured results from these exact prompts. Prepare the final platform crop separately.

Concept illustration: prominent white-bordered print depicting a cyclist in an orange jacket on an alpine trail, a tiny matching source print tucked in one corner, square composition, concrete task example
Outdoor episodeCreate a square video-cover concept showing one cyclist in an orange jacket on an alpine trail, with mountains behind and quiet space for a headline. No text or logos. The orange jacket gives the small subject a clear visual anchor.
Concept illustration: prominent white-bordered print depicting a cooking instructor with a copper pan, a tiny matching source print tucked in one corner, square composition, concrete task example
Cooking lessonCreate a cooking lesson cover with a fictional instructor holding a copper pan, a simple warm kitchen background and a clear silhouette. Leave room beside the person for a headline. One utensil signals the lesson without filling the frame with ingredients.
Concept illustration: prominent white-bordered print depicting an unbranded cream camera on a dark plinth, a tiny matching source print tucked in one corner, square composition, concrete task example
Camera reviewPhotograph an unbranded cream camera as the large focal object against a dark studio background, angled toward the viewer, with uncluttered room above it for later lettering. A large product shape makes the review topic readable at a glance.
Concept illustration: prominent white-bordered print depicting a fictional presenter with short dark hair and a teal sweater, a tiny matching source print tucked in one corner, square composition, concrete task example
Presenter tutorialCreate a tutorial cover featuring a fictional presenter with short dark hair and a teal sweater, facing the camera beside one relevant teaching object. Use a quiet background and no text. A restrained background keeps attention on the presenter and the object.

Who uses an AI thumbnail generator

Outdoor episode creators

An outdoor creator has a long trail video but only a small cover to explain it. Develop a concept around the rider and terrain, then choose a focal point that matches the actual route.

Open the canvas
Concept illustration: An editorial still life for use case 1: prints depicting a cyclist in an orange jacket on an alpine trail, paired with a plain pencil and unmarked sketchbook
Concept illustration

Cooking lesson publishers

A cooking instructor needs the cover to distinguish this lesson from last week's upload. Show the specific utensil or dish at the center of the episode, and leave recipe details for the title and video.

Open the canvas
Concept illustration: An editorial still life for use case 2: prints depicting a cooking instructor with a copper pan, paired with a folded blank brief and soft fabric swatch
Concept illustration

Product review channels

A reviewer wants viewers to recognize the item before they read the headline. Build the visual around a product reference you may use, then check the generated body shape against the actual object.

Open the canvas
Concept illustration: An editorial still life for use case 3: prints depicting an unbranded cream camera on a dark plinth, paired with an empty small presentation board
Concept illustration

Interview series editors

An editor is preparing several conversations with different guests. Use the guest's permitted portrait as a starting point for each cover, and make the episode topic visible without implying an endorsement that never happened.

Open the canvas
Concept illustration: An editorial still life for use case 4: prints depicting a fictional presenter with short dark hair and a teal sweater, paired with a simple unmarked story card
Concept illustration

Storytelling channels

A narrator needs one image to suggest a story without revealing its ending. Explore the central character or setting as a cover concept, then keep the selected image aligned with what the episode actually contains.

Open the canvas
Concept illustration: An editorial still life for use case 5: prints depicting a small red sailboat on a blue sea, paired with a blank invitation card
Concept illustration

Video thumbnail ideas for lessons

A course author is arranging a lesson library where covers appear beside each other. Develop a distinct visual cue for each topic, and review the set at its final display size before adding the lesson titles.

Open the canvas
Concept illustration: An editorial still life for use case 6: prints depicting a science teacher with a glass prism, paired with a plain folder with lavender tab
Concept illustration

Formats, access and licensing

Where to createUse the thumbnail generator at the top of this page. The result is also saved in a personal canvas project.
InputsA written prompt, with an optional reference image. Choose a preset to start a brief.
OutputA square 1K PNG image. This form uses fixed output settings; prepare the final crop and layout separately.
FramingThis form produces a square image. Crop to the required thumbnail dimensions separately; there is no aspect-ratio selector here.
TextCheck generated lettering. Keep important editable headlines in your design workflow.
Access and request costCheck your account access and the displayed requirement for the configured operation.Verified 2026-09-28
Free accountA free plan is listed on the pricing page; no credit card is required to start. Specific task access is separate.Verified 2026-09-28
Commercial usePaid-plan generated outputs have commercial rights subject to provider terms and input rights. Free-plan generation is for non-commercial evaluation.Verified 2026-09-28
Upload data useDefault-plan uploads, prompts and outputs may be used for training. Provider policies also apply. Enterprise opt-out needs an agreement; learned or aggregated data may persist after source deletion.Verified 2026-09-28

Image models for thumbnail concepts

Explore these models for separate canvas image workflows. The thumbnail form above uses a fixed model.

FLUX.2

Provider
Black Forest Labs
Type
image

Questions before you begin

What is an AI thumbnail generator?

This generator turns a brief or reference image into a still concept for a video cover. Use the form above, then prepare the platform crop and final typography separately. The image should represent the actual episode; it does not guarantee a click-through rate or a publishing-ready layout.

Is there a free plan?

Yes, Astorie lists a free plan with no credit card required. Check the current pricing page and the cost shown for your selected image request before generating a cover. A free account does not mean that every model, output setting or intended use is available without a limit.

Can I use the results commercially?

Paid-plan generations may be used commercially under Astorie's terms, subject to the selected provider's conditions and your rights in the material. Free-plan generation is for non-commercial evaluation. For a monetized cover, check permissions for presenter or product references and consult the commercial-rights guide before publication.

How do I make a thumbnail readable at small sizes?

Choose one main subject, give it space, and inspect the cover at the size viewers will see. If important details disappear, simplify the brief and try another composition. Keep the final title short enough for your design, and make sure the picture still represents the video accurately.

Create a cover for your next episode

Bring one video topic to the generator and develop a cover concept for your final layout.

Create a thumbnail conceptSee pricing