BrowserTools

Image Resizer

Resize images by pixels or percentage

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-09-21
Free Private No uploads
What is Image Resizer?

Sometimes you know the number: a marketplace avatar at 1000×1000, a hero image at 1920×1080, an Open Graph card at 1200×630. Sometimes you only know the relationship: half size, double size. This handles both. Type a width or a height and, with Keep aspect ratio ticked, the other value follows from the source's proportions; type into Scale % and both dimensions recalculate at once. There are shortcut buttons for 25%, 50%, 75%, 100%, 200%, 400%, and for the four sizes people ask for most. Downscaling uses high-quality resampling, so a shrink looks better than the same operation in a basic editor. Output can be PNG, JPG, or WebP — note that JPG and WebP are written at a fixed encoder setting here, and JPG cannot carry transparency.

Resize images to exact pixel dimensions or by percentage, with aspect-ratio locking and bulk support. Ideal for preparing photos for web, avatars, or marketplace requirements.

Private Image Resizer In Your Browser

Image Resizer is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use Image Resizer

1

Bring in a file with the Drop an image to resize target; anything your browser can display is accepted.

2

Leave Keep aspect ratio enabled, then set Width (px) or Height (px), or type a percentage into Scale %.

3

Pick an output format from the Format dropdown — PNG, JPG, or WebP — or use a preset size chip.

4

Press Resize image, then download the result from the button showing its file size.

Key Capabilities
  • Aspect ratio locking is on by default and reports the source dimensions, e.g. Keep aspect ratio (1920×1080)
  • Dimensions can be typed directly or derived from a percentage, with preset chips for 25% through 400% and four common target sizes
  • Output format is selectable as PNG, JPG, or WebP per resize
  • Dimensions are clamped to a 1–10000 pixel range, and downscaling uses high-quality resampling
Common Use Cases
  • A marketplace seller preparing product photos to the exact pixel dimensions a listing platform requires.
  • A designer generating the half-size and double-size variants of an asset for a responsive layout.
  • A developer batch-preparing avatars at 256×256 before uploading them to a user account.
Clear Answers

Frequently Asked Questions

What happens to transparency if I export as JPG?
JPG has no alpha channel, so transparent regions are flattened rather than preserved. If your image needs an alpha channel, leave the format on PNG.
Is resizing to a larger size going to improve the image?
No. Enlarging interpolates existing pixels and invents the new ones. It will look softer, and no amount of slider tweaking recovers detail that was never captured. Resizing is for matching requirements, not for adding resolution.
Can I resize several files at once?
This tool handles one image per run. Drop the next file when you are done with the current one.
Are my images uploaded to be resized?
They are not. The resample and re-encode run in the browser tab, so no request appears in the Network panel.