Image Resizer

How to use

1. Upload your image — Drop a JPG, PNG, or WebP file
2. Pick new dimensions — Type custom width/height or choose a preset. Keep aspect ratio on by default.
3. Resize & download — Save the resized image with one click

What Is an Image Resizer?

An image resizer changes the pixel dimensions (width × height) of a photo or graphic. Resizing is one of the simplest and most effective ways to shrink file sizes for the web, prepare images for social media platforms with strict size requirements, and fit photos to printable paper sizes. This tool uses the browser Canvas API to resize JPG, PNG, and WebP images entirely on your device — nothing is uploaded.

When You Should Resize

• Before uploading to a website: A 4000-pixel-wide photo from a phone is wasteful on most blog layouts that display images at 800–1200 pixels.
• For social media: Instagram, Twitter, and LinkedIn each have ideal sizes. Pre-resizing avoids automatic cropping or quality loss.
• For email: Reducing to 1024×768 typically cuts a photo from megabytes to kilobytes.
• For printing: Match dimensions to your printer's DPI × inches (e.g., 300 DPI × 8 inches = 2400 px).

Aspect Ratio Matters

Aspect ratio is the proportional relationship between width and height (e.g., 16:9, 4:3, 1:1). Changing width or height independently distorts the image — circles become ovals, faces look stretched. Keeping aspect ratio locked preserves the original proportions. To change the ratio without distortion, crop the image first using the Image Cropper.

Upscaling vs Downscaling

Downscaling (making an image smaller) is essentially lossless to the eye — pixels are averaged together. Upscaling (making it larger) adds pixels by interpolation, which produces blur. There is no software trick that recovers detail that was never captured. If you need a higher-resolution version, the only real solution is to reshoot or rescan at a higher resolution.

Privacy

Your image is processed entirely in your browser via Canvas. It never leaves your device, never reaches a server, and there is no tracking or login. Close the tab and nothing is retained.

Need to shrink file size without changing dimensions? Use the Image Compressor. Calculate the right new dimensions with the Aspect Ratio Calculator.

Frequently asked questions

Does resizing reduce file size?

Yes. A 4000×3000 photo at 80% quality is roughly 4–6 MB; the same image at 1200×900 is usually 300–500 KB.

Will the image lose quality if I make it bigger?

Yes. Upscaling adds pixels by interpolation — the image becomes blurry. Resize down when possible.

How is aspect ratio preserved?

When 'Keep aspect ratio' is on, changing width auto-updates height (and vice versa) so the image isn't stretched.

Which output format is used?

The same format as your input. JPG stays JPG, PNG stays PNG, WebP stays WebP. To change format, use the format converter tools.

Related free tools

• Photo & Signature Resizer — Crop and resize a photo or signature to exact px/cm and a KB limit for online forms.
• JPG to PNG Converter — Convert JPG images to lossless PNG in your browser. Supports transparency.
• PNG to JPG Converter — Convert PNG to JPG — typically 60–90% smaller files. Custom background colour.
• Image to WebP Converter — Convert JPG, PNG, or GIF to WebP. 25–50% smaller files for faster websites.
• Image Cropper — Crop JPG, PNG, or WebP images with drag-to-crop and aspect ratio lock. 100% private.
• Image Rotator & Flipper — Rotate any angle or flip horizontally/vertically. Fix sideways phone photos in seconds.
• Image Color Picker — Click any pixel to get HEX, RGB, and HSL values. Match brand colours from logos.
• EXIF Viewer — Read camera, lens, date, GPS and other metadata embedded in JPEG photos.
• Image Watermark — Add custom text watermarks with position, opacity, colour, and rotation controls.
• Image to PDF Converter — Combine multiple JPG or PNG images into a single PDF. Fit-to-image, A4, or Letter.
• Image Combiner — Join multiple images side-by-side, stacked, or in a grid. Great for before/after.
• Image Filters & Effects — Apply B&W, sepia, vintage, noir presets plus brightness, contrast, hue sliders.