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New: Buno for AI assistants. Create and edit designs from Claude or Cursor.Learn more

How it works

One banner in. Every size out.

Four steps from your idea to 37 ready-to-post files. You design one master banner; Buno makes every other size.

Start designing for freeWatch the quick walkthrough

Free to start. No credit card. No design skills needed.

Two ways to start

Start in Buno

Design your master banner in the editor, from a blank canvas or a starter template. Follow steps 1 to 4 below.

Start designing for free

Start in your AI assistant

Connect Buno MCP to Claude, Cursor or any MCP app, then describe your campaign. Your assistant builds the banner in Buno, and you pick up at step 3.

Connect Buno to your AI
  1. 01

    Step 1

    Start however you like.

    • Blank canvas.Pick your master size and start designing.

    • A starter template.Begin from one of 5 starters, like Flash Sale or Product Launch.100+ campaign templatesComing soon

    • Your AI assistant.Ask Claude, Cursor or another MCP app to create the banner in Buno for you. ChatGPT is coming soon.

    Buno new design screen: name your design, set the master size, and choose a blank canvas or a starter template.
  2. 02

    Step 2

    Make the one version you care about.

    Add your headline, images, logo, button and brand colours. This is the only design you build by hand.

    Name your layers like "Headline" or "Logo"? You don't have to. Buno figures out what each element is.

    Buno editor with the headline selected. The panel shows its role as headline, a contrast check that passes AA, and a smart resize note.
  3. 03
    Started in your AI assistant? You join here.

    Step 3

    Pick platforms, not pixels.

    Tick the sizes you need or choose a quick pack:

    • Social essentials8
    • Stories & Reels3
    • Display ads9
    • Email4
    • Every size37

    Buno then lays out each size for its shape, keeps text in the safe zones and fixes contrast.

    Animation: in Buno's Add sizes drawer, the Social essentials pack adds 8 sizes, then Display ads adds 9 more, for 17 sizes selected.

  4. 04

    Step 4

    Check the grid. Download the lot.

    See every size side by side. Buno flags anything that needs a look, and you can adjust any single size by hand.

    Add captions, then export PNG, JPG, WebP or PDF in one ZIP. Post with the tools you already use.

    Buno sizes grid showing all 37 sizes side by side, with a Needs review filter and platform chips.

Under the hood

What smart resizing actually does.

  1. 01

    Classifies the shape. Each size is a strip, wide, landscape, square, portrait or tall layout.

  2. 02

    Reads each element's role. Headline, subheadline, body, image, logo, button, background.

  3. 03

    Rebuilds the layout. Elements are placed for the shape, not scaled down.

  4. 04

    Trims by priority. Body text first, image next. Headline, logo and button stay.

  5. 05

    Checks safety. Safe zones and WCAG AA contrast on every size.

1200×628Facebook feed post

See it with your own design.

Make one master banner and get every size you need.

Start designing for freeConnect Buno to your AI

Free to start. No credit card. No design skills needed.

One banner in. Every size out.

Buno new design screen: name your design and choose a blank canvas or a starter template.