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Thumbnail Generator

Create square or aspect preserving thumbnails at several sizes and download each one.

Generate thumbnails

64 px 128 px 256 px 512 px Custom size
Thumbnails: —
Each thumbnail is drawn on a local canvas and offered as a separate download in your chosen format.

How to use the Thumbnail Generator

  1. Load the photo you want to shrink into thumbnails.
  2. Choose square crops or aspect preserving scaling, plus a format and quality.
  3. Click the size links to download a 64, 128, 256, 512 pixel or custom thumbnail.

Features

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Frequently Asked Questions

Common questions about the free online thumbnail generator.

Square mode crops the photo to fill a perfect square, while fit mode keeps the whole photo visible inside the chosen maximum size.
The tool always builds 64, 128, 256 and 512 pixel versions, and the custom size box lets you add any size from 16 to 1024 pixels.
Quality applies to JPEG and WebP output. A lower value makes a smaller file with more compression artefacts, while PNG ignores it.
Click one of the size links, such as 128 px, and your browser saves that exact thumbnail with the name of the original photo.
Very small thumbnails contain few pixels, so fine detail disappears. Generate a larger size if you need more visible detail.
No. The image is decoded in your browser and every thumbnail is drawn on a local canvas before you download it.
Yes. Square thumbnails suit grids and galleries, while fit mode is better when a wide banner shape must be preserved.
The custom size accepts up to 1024 pixels, and larger values are clamped so the browser never runs out of memory.
Yes. The generator works in any modern mobile browser and can read photos straight from the camera roll.
Yes. It is completely free with no account, no watermark and no limit on how many thumbnails you create.

Last updated: October 10, 2026