Create a Thumbnail
Shrink an image so its longest side fits a set size, keeping aspect. Runs entirely in your browser, so your data never leaves your device.
Drop a file here, or click to browse
Files never leave your device
Output
The result appears here as you type.
How to use Create a Thumbnail
- 1. Upload the image. Drop in the photo you want shrunk down to a small preview size. Any common image format is accepted for decoding.
- 2. Set the Max long side (px). Enter the largest pixel size the longer edge of the image should reach. A landscape photo scales by width, a portrait photo scales by height, keeping the original aspect ratio.
- 3. Download the thumbnail. Save photo.png once the preview shows the resized image, ready for use anywhere a small preview is needed instead of the full-size original.
When to use Create a Thumbnail
Create a Thumbnail shrinks an image so its longest side fits a set size while keeping its original aspect ratio intact. It solves the common need for a smaller preview version of a photo without distorting its proportions.
- Generating gallery preview images. A photo gallery page loads dozens of full-resolution images at once, and generating a small thumbnail for each one first keeps the page loading quickly.
- Preparing a product image for a listing grid. An online store shows many product photos in a compact grid layout, and shrinking each source photo to a set long-side size keeps the grid uniform and fast.
- Creating an avatar or profile preview. A user-uploaded profile photo is far larger than needed for a small avatar display, and generating a thumbnail keeps file sizes down without cropping the image awkwardly.
Examples
200 px thumbnail
Input
photo.jpg + size 200
Output
photo.png scaled so its long side is 200 px
About the Create a Thumbnail tool
Create a Thumbnail runs as plain JavaScript in your browser tab, with no server behind it. Shrink an image so its longest side fits a set size, keeping aspect. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Image Tools section, 200 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with the Max long side (px) setting, and the result refreshes the moment you change it. The finished file is put together in browser memory and saved with the Download button, so it never touches a server on the way to your disk. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Create a Thumbnail cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
Which files does Create a Thumbnail accept?
It accepts images in any common format (PNG, JPG, WebP, GIF and more). There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I save the output?
Click the Download button once the result is ready. The file is built in your browser's memory and handed straight to your downloads folder, without passing through a server.