Image Resizer
Resize an image by pixels or percent, keep the aspect ratio, and export JPEG, PNG or WebP. Runs entirely in your browser.
Drop an image here, or click to browse
JPEG, PNG, WebP, GIF or SVG. Stays in your browser.
Resizing is done locally with high-quality canvas smoothing. Nothing is uploaded.
Resizing versus cropping versus compressing
Resizing changes how many pixels an image has. Cropping throws pixels away from the edges. Compression changes how those pixels are stored. They solve different problems: a 6000×4000 photo is too large to email even at high JPEG quality; resizing it to 1600×1067 drops the pixel count before you even think about quality.
Keeping the aspect ratio avoids stretching faces and logos. Unlock it only when you deliberately want a different shape and accept distortion, or pair it with the cropper to change shape without stretching.
Percent mode is useful when you want “half size” without doing the arithmetic. Pixel mode is better when a site specifies an exact width (Open Graph images are often 1200×630 — that is a crop plus a resize, not a stretch).
Enlarging a small image cannot invent detail. The tool will upscale if you ask, but the result will look soft. Prefer a larger original.
Processing is local. The preview is the actual output file you will download, encoded as PNG, JPEG or WebP.
Related tools
These free tools pair well with this page — open them in a new tab to finish your workflow.
Frequently Asked Questions
Does resizing compress the file?
Fewer pixels usually means a smaller file, but this tool’s job is changing dimensions. For a target kilobyte size, resize first and then run the compressor.
Why lock the aspect ratio?
Keeping width and height in proportion avoids stretching faces and logos. Unlock it only when you really want a different shape; to change shape without distortion, crop instead.
Can I enlarge a small image?
Yes, but the browser cannot invent detail. Upscaling looks soft. Prefer a larger original when you need more pixels.
What is percent mode for?
Scale the whole image by a percentage — 50% is half the width and height, a quarter of the pixels. Useful when you do not care about an exact pixel width.
Which export format should I use?
PNG if you need transparency or sharp UI. JPEG or WebP for photographs. Quality applies to JPEG and WebP only.
Is anything uploaded?
No. Drawing and encoding happen in your browser with the Canvas API.
What is the size limit?
About 25 MB or 40 million pixels, whichever comes first. Very large phone panoramas may need a desktop editor.