Pixels or percentage?

Pixels when you have a target spec (e.g. 'must be exactly 1200×630 for OG image'). Percentage when you're just shrinking ('half the size of the original'). Lock the aspect ratio in either mode to avoid stretched output.

Does upsizing improve quality?

No. Upsizing (e.g. 500px → 2000px) doesn't add detail; Canvas interpolates between existing pixels. The result looks blurry compared to a true 2000px source. Use this tool to shrink confidently; for upsizing, find a higher-resolution source or use an AI upscaler.

What format is the output?

Same format as the input (PNG stays PNG, JPG stays JPG). To change the format too, run the output through the image-converter tool.

Redimensionador de imagen

Redimensiona imágenes por píxeles o porcentaje en tu navegador - sin subida.

Funciona en tu navegador

Suelta una imagen, elige nuevas dimensiones (píxeles o porcentaje), bloquea la relación de aspecto para escalar proporcionalmente, y descarga. El original no se modifica ni sube - la copia se genera localmente vía Canvas.

Suelta una imagen o haz clic para elegir una

PNG, JPG, WebP, AVIF, GIF, BMP

Cómo usarla

Drop an image
Drag a PNG / JPG / WebP / AVIF / GIF onto the dropzone or click to pick one.
Set the new dimensions
Type pixels (lock aspect ratio for proportional scaling) or use the percentage shortcut (50%, 25%).
Download
The resized copy downloads with `-resized` appended to the filename. The original is untouched.

¿Qué es?

An image resizer changes the pixel dimensions of an image - shrinking it to save bandwidth, or fitting it to a target spec. The browser's Canvas API handles the actual resampling using bilinear or bicubic interpolation depending on the engine. Quality is preserved when you shrink; upsizing can't add detail that wasn't in the source.

Cuándo usarla

Resizing photos before uploading to a service with a max file size, fitting an image to a specific design slot (1200×630 for OG, 1080×1080 for Instagram), or batch-shrinking a screenshot for a documentation page. Anywhere you need to change pixel dimensions without round-tripping through Photoshop.

Errores comunes

Forgetting to lock the aspect ratio and ending up with a stretched / squashed image. Saving the same image at the same dimensions repeatedly (each save through a lossy format like JPG loses a little quality - the so-called 'generational loss'). And upsizing in the hope of recovering detail - it doesn't work; pick a higher-res source instead.

Preguntas frecuentes

Pixels or percentage?: Pixels when you have a target spec (e.g. 'must be exactly 1200×630 for OG image'). Percentage when you're just shrinking ('half the size of the original'). Lock the aspect ratio in either mode to avoid stretched output.
Does upsizing improve quality?: No. Upsizing (e.g. 500px → 2000px) doesn't add detail; Canvas interpolates between existing pixels. The result looks blurry compared to a true 2000px source. Use this tool to shrink confidently; for upsizing, find a higher-resolution source or use an AI upscaler.
What format is the output?: Same format as the input (PNG stays PNG, JPG stays JPG). To change the format too, run the output through the image-converter tool.

Conversor de imagen

Convierte PNG, JPG, WebP y AVIF en tu navegador - sin subida, sin registro.

Compresor de imagen

Reduce el tamaño de JPG y WebP con slider de calidad y vista previa antes/después en vivo.

Recortador de imagen

Recorta imágenes arrastrando una selección - libre o con relaciones de aspecto fijas (1:1, 4:3, 16:9, 9:16).