↔️ Image Resizer

Resize images to exact pixel dimensions or percentages. Supports JPEG, PNG, WebP, and GIF. Free online image resizer — runs in browser, no uploads to any server.

Drop image here or click to upload

PNG, JPG, WebP supported

How to Use

Upload your image

Drag and drop any image or click to browse. Original width and height are filled in automatically.

Set new dimensions

Enter target width or height in pixels. Toggle the lock icon to keep the original aspect ratio.

Download resized image

Choose output format (PNG/JPEG/WebP) and quality level, then click Resize and Download.

Frequently Asked Questions

Can I resize without losing quality? +

Enlarging an image always reduces sharpness because you are adding pixels that did not exist. Shrinking an image generally preserves quality well. For best results when enlarging, use a dedicated AI upscaler.

What does "lock aspect ratio" mean? +

When aspect ratio is locked, changing the width automatically recalculates the height (and vice versa) to keep the image proportions the same. This prevents stretching or squishing.

What output formats are supported? +

You can save the resized image as PNG (lossless), JPEG (smaller file, adjustable quality), or WebP (best compression with good quality). WebP is recommended for web use.

Is there a maximum image size? +

There is no hard limit, but very large images (over 10,000×10,000 pixels) may cause the browser to run slowly. The tool processes everything locally without any server.

Is my image sent to a server? +

No. The entire resize operation runs in your browser using the HTML5 Canvas API. Your image never leaves your device.

Guía: Redimensionador de Imágenes

¿Qué es?

Una foto de smartphone de 12MP (~5MB) mostrada a 400px descarga 5MB para mostrar 400px — un desperdicio de 10-50×. Redimensionar antes de subir es la optimización más básica y efectiva para el rendimiento web.

Cómo usar

Sube la imagen (JPEG, PNG, WebP, GIF).
Ingresa las nuevas dimensiones en píxeles o porcentaje.
Activa "Mantener proporción" para evitar distorsión.
Descarga la imagen redimensionada.

Consejos

Usa srcset para servir tamaños diferentes según el dispositivo.
Para hero images, máximo 1920px de ancho.
Combina redimensionado con compresión para máximo ahorro.