Image Resizer
Resize images by width, height or percentage — sharp and entirely offline
About this tool
Resize an image to an exact width, an exact height, or a percentage of the original — the other dimension follows automatically so nothing gets stretched. Pick an output format (or keep the source format), set quality for lossy targets, preview the result, and download. Before/after tiles show dimensions and file size at a glance.
Scaling uses the browser's high-quality smoothing mode, which applies proper resampling rather than nearest-neighbor decimation — downscaled photos stay crisp instead of shimmering with aliasing. Resizing is also the honest way to shrink file size: halving both dimensions removes three quarters of the pixels, which no quality slider can match.
Files never leave the page: decoding, resampling and re-encoding all run on a local canvas. There is no upload progress bar because there is no upload — a 40-megapixel photo resizes as fast as your machine can redraw it, and works with the network cable unplugged.
Frequently asked questions
- Will resizing down and back up restore my image?
- No — downscaling discards pixels permanently. Scaling a 3000px photo to 300px keeps 1% of the data; enlarging it back interpolates the missing 99% as blur. Keep the original file and export resized copies from it, rather than resizing the only copy you have.
- Why does my upscaled image look soft?
- Enlarging cannot create detail that was never captured — the browser interpolates between existing pixels, which reads as softness beyond about 2×. Genuine upscaling beyond that needs ML-based tools that hallucinate plausible detail; a canvas resampler deliberately does not invent anything.
- How do I hit a target file size, like "under 200 KB"?
- Work both levers: first resize to the largest dimensions you actually need (a 1200px-wide image is plenty for most web layouts), then choose WebP or JPEG and lower quality until the size tile reads under target. Dimension reduction does most of the work — quality tweaks fine-tune the rest.
- Does resizing strip EXIF metadata like GPS location?
- Yes. The canvas pipeline re-encodes pure pixels — camera model, timestamps, GPS coordinates and every other EXIF tag are gone from the output. That is usually a privacy win for images headed to the public web; if you need metadata preserved, keep the original alongside.