Resize an Image
Change an image's dimensions by setting the width you want. The height follows automatically, so the picture is never stretched or squashed.
Resizing is the most effective way to reduce an image file: a photo straight from a phone can be 4000 pixels wide, while a website rarely displays one above 1200. Scaling it down typically removes far more weight than compression alone.
How it works
Filembly scales the image to your chosen width with high-quality Lanczos resampling — the same approach desktop image editors use — and calculates the height from the original aspect ratio.
Enlarging is deliberately not allowed. Scaling an image beyond its native size cannot add detail that was never captured, so the tool tells you the original width and asks for a smaller number instead of returning something blurry.
The output keeps the format you uploaded, re-encoded at high quality so the resize itself is not what costs you sharpness.
How to resize image
- Upload the JPG, PNG or WebP image.
- Enter the width you want in pixels — 1200 suits most web use.
- Click Resize image.
- Download the resized image.
Limitations to know about
- Only the width is set; the height always follows the original aspect ratio. Cropping and fixed-ratio fitting are not currently available.
- Images cannot be enlarged beyond their original width.
- Bulk resizing of several images at once is not currently supported — run one at a time.
Privacy and security
Your files are uploaded over HTTPS, processed entirely in memory and streamed straight back to your browser. They are never written to disk, never logged and never retained after the response — there is nothing to delete because nothing is stored. Uploads are validated by extension, type and content signature, and are never executed. Read more in our privacy policy.
Frequently asked questions
What width should I choose?
For a full-width website image, 1600 to 1920 is generous. For an in-article image, 800 to 1200 is plenty. For a thumbnail or avatar, 200 to 400. When in doubt, match the largest size the image will actually be displayed at.
Why can't I make my image bigger?
Because it would not add any detail. Enlarging invents pixels by interpolating between existing ones, which produces a softer, blurrier picture rather than a sharper large one. The tool blocks this and tells you the original width instead.
Does resizing change the aspect ratio?
Never. You set the width and the height is calculated from the original proportions, so the image is scaled evenly and nothing is distorted.
Should I resize or compress to reduce file size?
Resize first, then compress. Halving the width removes about three quarters of the pixels, which almost always saves more than compression can on its own. Compressing the already-resized image then squeezes out what remains.