Advertisements

header • up to 320x100 / 728x90

Resize Image

Resize any image to exact pixel dimensions or a percentage, with optional aspect-ratio lock and instant PNG/JPG export

Resize Image
Resize to exact pixel dimensions or a percentage. Lock the aspect ratio to avoid distortion.

Drop an image here or pick one below.

Advertisements

content bottom • up to 300x250

What is Resize Image

Last reviewed:

Resizing changes an image's pixel dimensions. Downscaling reduces file size and is used for thumbnails and web delivery; upscaling enlarges an image at the cost of softness.

Resize Image offers precise pixel inputs, 25/50/75/100% quick presets, and an aspect-ratio lock so the image never gets stretched or squished.

Why use it

  • Hit an exact pixel size for a social post, OG image, or email header.
  • Shrink large photos before email or upload to reduce file size.
  • Scale up for print with high-quality browser resampling.
  • No upload required — your image stays local.

Features

  • Pixel or percent inputs
  • Lock aspect ratio switch
  • High-quality browser resampling
  • PNG and JPG export
  • Live preview
  • Resampling runs locally in your browser

How to use Resize Image

  1. Upload. Drop an image into the workspace.
  2. Enter new size. Type width/height or click a 25/50/75/100% preset.
  3. Export. Click Download to save PNG or JPG.

Example (before/after)

Full-resolution photo

photo.jpg (4032×3024, 2.4 MB)

Resized to 1200×800

photo.png (1200×800, aspect-ratio-locked, lossless PNG at ~180 KB)

Common errors

Image looks stretched

Typing only a width or height without the aspect lock distorts the image.

Fix: Keep Lock Aspect Ratio on and adjust either dimension — the other follows automatically.

Upscale looks blurry

Enlarging past the source resolution can never add detail.

Fix: Keep upscales under 200% for acceptable results; for large enlargements, use an AI upscaler.

FAQ

Is my image uploaded?

No. Resizing is done locally using the browser's high-quality image smoothing.

What resampling algorithm is used?

The browser's built-in `imageSmoothingQuality: 'high'`, which is typically a bicubic-like filter.

Can I resize by percent?

Yes — the 25/50/75/100% buttons scale both dimensions instantly.

Does it preserve transparency?

Yes, when you export as PNG. JPG flattens transparency to white.

Related tools

Related image tools: You can also browse the full Image Tools category for more options.

Crop Image

Crop any image to a custom rectangle with precise pixel coordinates or preset aspect ratios — client-side only

Rotate Image

Rotate an image by any angle (including free-form degrees) with transparent fill — fast, browser-based

Flip Image

Mirror any image horizontally or vertically in the browser with a single click and export as PNG or JPG

Round Image Corners

Add rounded corners to any image with adjustable radius and transparent background — export as PNG

Grayscale Image

Convert any image to black-and-white grayscale in the browser with adjustable intensity and instant PNG/JPG export

Desaturate Image

Reduce the saturation of any image with a slider from full color to fully desaturated — runs entirely in your browser

Pixelate Image

Apply a pixelation (mosaic) effect to any image with an adjustable block size — perfect for retro looks or quick redactions

Image to Base64

Convert local image files into Base64 text ready to paste into email, JSON payloads, or data URLs

Base64 to Image Converter

Paste any Base64 data URL or raw Base64 string, auto-detect the MIME type, and preview plus download the image

Censor Image (Blur & Pixelate)

Redact sensitive areas of an image by drawing a rectangle and applying pixelate or blur — everything stays in your browser

Image Invert Colors

Invert colors of an image

Image Metadata Viewer

Inspect image dimensions, alpha support, and basic file metadata