Thumbnail Generator

Create small image thumbnails right in your browser.

ToolsSoup's Thumbnail Generator is a free online tool that turns any photo into a small, lightweight thumbnail right in your browser. Upload a JPG, PNG, or WebP, pick a thumbnail size, choose to crop or fit the image, and download the result in seconds — with no uploads, no watermarks, and no sign-up. Your images never leave your device.

What is a thumbnail generator?

A thumbnail generator shrinks a full-size image into a small preview version called a thumbnail. Thumbnails are the little images you see in galleries, video lists, product grids, file managers, and link previews. Because they are much smaller in both dimensions and file size, thumbnails load faster and use less bandwidth than full images. This tool redraws your picture at the exact thumbnail size you choose and exports a fresh file you can download.

How to create a thumbnail online

Making a thumbnail with ToolsSoup takes just a few seconds:

  1. Click Choose an image and select the photo you want to shrink.
  2. Pick a thumbnail size preset, or choose Custom and type an exact width and height.
  3. Choose Crop to fill for a perfectly sized thumbnail, or Fit inside to keep the whole image visible.
  4. Pick an output format (PNG, JPEG, or WebP) and click Generate thumbnail, then download it with one click.

Crop to fill vs. fit inside

These two modes control how your image fits the thumbnail box. Crop to fill scales the image up to cover the entire thumbnail and trims the overflow from the edges, giving you a thumbnail with no empty borders — ideal for square avatars and uniform grids. Fit inside scales the image down so the whole picture is visible within the box, which can leave transparent or empty space on the sides when the shapes don't match. Use crop for consistent tiles and fit when you must keep every part of the image.

Why use this thumbnail generator?

  • 100% free with no ads, watermarks, sign-up, or usage limits.
  • Runs entirely in your browser — your images are never uploaded to a server.
  • Handy size presets plus custom width and height for any thumbnail.
  • Crop-to-fill or fit-inside modes for square avatars or full-image previews.
  • Export to PNG, JPEG, or WebP and download your thumbnail instantly.

Frequently asked questions

Is this thumbnail generator free?

Yes. Every tool on ToolsSoup is completely free to use, with no account, sign-up, watermarks, or hidden limits.

Are my images uploaded to a server?

No. All processing happens locally in your browser using the HTML canvas, so your images are never uploaded, stored, or seen by anyone but you.

What is a good thumbnail size?

It depends on where you'll use it. Common sizes range from 100×100 for tiny icons to 150×150 for list previews and 300×300 for larger gallery tiles. The presets here cover those sizes, and you can enter any custom dimensions you need.

How do I make a square thumbnail?

Set the width and height to the same value and choose Crop to fill. The tool centers the image and trims the edges so it fills the square exactly without stretching.

What image formats are supported?

You can load common formats such as JPG, PNG, and WebP, and export your thumbnail as PNG, JPEG, or WebP. Choose JPEG or WebP for the smallest file sizes.