Resize images instantly in your browser
Drop your photos, choose pixel-perfect presets or scaling percentages, and export crisp results without leaving the page.
Toggle between fixed dimensions and proportional scaling, queue multiple files, and download the resized versions in one click.
Why creators love this resizer
Built for designers, marketers, and product teams who need fast, reliable exports.
Batch ready
Process a gallery of images at once. Everything runs locally so your files stay on your device.
Flexible controls
Switch between exact pixel dimensions or percentage-based scaling with aspect ratio locking.
Reusable presets
Save your favourite export sizes to the browser and recall them instantly next time.
How to resize images with OneImage
Simple steps to resize your images professionally
Upload one or many photos
Drag images into the drop zone or click the button to browse. Files are processed locally.
PNG, JPG, and WebP files up to 25 MB each are supported.
Choose resize mode
Pick fixed pixel dimensions or percentage-based scaling depending on your export needs.
Enable aspect ratio lock to avoid distortion when targeting specific widths.
Configure presets
Select a built-in preset or save a custom size to reuse later.
Presets are stored in the browser so your favourite sizes load instantly next session.
Process and download
Click Resize images to generate results for the entire batch, then download individually or all at once.
Processed images keep the original format whenever possible.
How the resizing engine works
The tool renders each image into an off-screen canvas using your chosen dimensions or scale factor. When aspect ratio lock is enabled, widths are honoured and heights are calculated from the original ratio to avoid stretching. The processed canvas is then exported back to the same format for quick downloads.
Frequently asked questions
Answers to common questions about the OneImage resizer.
Does resizing happen locally?
Yes. All calculations run in your browser so files never leave your device.
Can I resize transparent PNGs?
Absolutely. Transparency and color profiles are preserved in the exported image.
Is there a limit to how many images I can upload?
You can add as many images as your browser memory allows. Large batches may take longer to process.
What output formats are supported?
The tool keeps the original format when possible. Otherwise it falls back to high-quality PNG.
Can I delete saved presets?
Yes. Custom presets show a remove button so you can keep only the sizes you need.