Poster Maker

1200×1800px · Free, private, runs in your browser.

What is Poster Maker?

Poster Maker is a free online tool that resizes images to the exact pixel size each platform expects. It runs in your browser with JavaScript and the canvas API, so your photos are never uploaded to a server and there is no sign-up, watermark or daily limit. It belongs to our Social Media collection of 95 image tools.

Available options: Fit. Quick presets include Cover (crop), Contain (fit). 1200×1800px.

How to use Poster Maker

  1. Open Poster Maker and drop, paste (Ctrl+V) or select your image.
  2. Adjust the options and watch the live preview.
  3. Hold the original button or use the before/after slider to compare.
  4. Press Apply to keep the change. Undo and redo are always available.
  5. Choose PNG, JPG, WEBP, AVIF or ICO, then download, copy or share the result.

Benefits

  • Private: files stay on your device
  • Fast: results appear instantly as you change settings
  • Free: no account, watermark or limits
  • Flexible: batch ZIP download for many files at once
  • Works on mobile, tablet and desktop

Features

Live preview, zoom and pan, before and after comparison, fullscreen view, undo and redo, copy to clipboard, share, keyboard shortcuts (Ctrl+Z, Ctrl+Y, Ctrl+S, Ctrl+V) and a download history.

When to use Poster Maker

Typical uses include posts, stories, banners, covers, thumbnails and stickers. Use cover to fill the frame, or contain to keep the whole image with white padding.

Poster Maker FAQ

Is Poster Maker free?

Yes. Poster Maker on Imagine Tool is free, with no sign-up, no watermark and no daily limit.

Are my images uploaded to a server?

No. Poster Maker runs entirely in your browser, so your images never leave your device.

Which image formats does Poster Maker support?

Any image your browser can open, including JPG, PNG, WEBP and GIF, and often AVIF. You can export PNG, JPG, WEBP, AVIF or ICO.

What size does this create?

The tool outputs the exact platform dimensions shown on the page, ready to upload.

Does Poster Maker work on mobile?

Yes. The page is fully responsive and works on phones, tablets and desktops.

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