Image Compression Guide
Use the compression ratio calculator, then learn how lossy and lossless methods affect quality, formats, and web performance.
Measure image compression
Compare before and after file sizes to quantify savings and choose an appropriate workflow.
Make image compression measurable
Calculate actual savings
Compare original and compressed file sizes as a percentage and ratio.
Understand the method
Choose lossy or lossless compression based on content and reuse needs.
Check visual quality
Use the result as a guide, then inspect fine details at intended display size.
Lossy vs lossless compression
| Method | What changes | Lo mejor para | Typical formats |
|---|---|---|---|
| Lossy | Discards selected image detail | Photos and web delivery | JPG, WebP, AVIF |
| Lossless | Preserves decoded pixels | Graphics, text, editing | PNG, lossless WebP |
como funciona
-
1
Ingrese sus requisitos
Proporcione tamaños de archivo o elija las características de la imagen del sitio web.
-
2
Revisa el resultado
Lea los ahorros calculados o el formato recomendado y su justificación.
-
3
Descargar la decisión
Guarde el resultado para un flujo de trabajo de optimización o contenido.
A practical image compression workflow
Resize oversized pixel dimensions before lowering quality. For photographs, test WebP, AVIF, or controlled JPG quality. For screenshots and graphics with sharp text, start with PNG or lossless WebP. Keep an original master and compress delivery copies.
Preguntas frecuentes
What is image compression?
Image compression reduces storage and transfer size by encoding pixels more efficiently or discarding selected detail.
What is the difference between lossy and lossless?
Lossy compression removes some detail for smaller files; lossless compression preserves decoded image data.
What compression ratio is good?
There is no universal ratio. The right result is the smallest file that still looks acceptable at its intended size.
Image Compression Guide last reviewed: Jul 18, 2026.