Resize Image Online – Free & Private
Change the width and height of any image in your browser. No upload, no software, no watermark.
Use the free FormatFlash converter, which includes a resize option alongside format and quality controls. Everything runs in your browser.
Resizing means changing an image's pixel dimensions — its width and height. It is a common need: preparing a profile picture, fitting an image into a layout, or shrinking an oversized photo before uploading it.
How to resize an image
- Open the free FormatFlash image converter.
- Drop your image onto the page.
- Tick Resize and enter a maximum width and/or height in pixels.
- Choose the output format and quality, then convert and download.
The resize keeps the aspect ratio, so your image will not be stretched. Everything is processed locally in your browser — your image is never uploaded.
Resizing tips
Downscale for the web
Match the dimensions to how the image is actually displayed. There is no point serving a 4000-pixel photo in a 600-pixel slot.
Avoid upscaling
Enlarging an image reduces sharpness because no new detail can be created. Start from the largest source you have.
Combine with conversion
Resize and convert in one step — for example, shrink a PNG and export it as WebP for the smallest result.
Frequently asked questions
Can I resize an image online for free?
Yes. The FormatFlash converter includes a resize option that runs entirely in your browser.
Are my images uploaded?
No. Resizing and conversion happen locally on your device.
Can I resize without losing quality?
Downscaling to a smaller size keeps images sharp. Upscaling cannot invent detail that was never there.
Which formats can I resize?
You can load JPG, PNG, WebP, HEIC, GIF, BMP and AVIF, and output JPG, PNG or WebP.
Does resizing also reduce file size?
Yes. Smaller dimensions mean fewer pixels and a smaller file.
Related guides
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