PIXPACT

Practical format guide

Image Compression Guide

Smaller images make pages faster and easier to share. The right format depends on your destination, transparency needs, browser support, and the amount of visual detail you want to keep.

Compress an image privately

PixPact processes images locally in your browser. No account and no image upload are required.

Choose a format

JPG / JPEG

Best for photographs and broad compatibility. Lower the quality slider when you need a smaller file and can accept some compression artifacts.

Compress JPG

PNG

Best for transparency, screenshots, and graphics that need crisp edges. PixPact keeps PNG output lossless, so the quality control is intentionally disabled.

Optimize PNG

WebP

A strong default for many modern websites. It often delivers a smaller file than JPG or PNG while keeping good visual quality.

Create WebP

AVIF

Useful when your destination supports it and you want efficient modern image delivery. Test the result on the browsers and platforms your audience uses.

Create AVIF

HEIC / HEIF

Common on Apple devices and efficient for originals. Convert to JPG when a website, email client, or older device needs broader compatibility.

Convert HEIC to JPG

A practical compression checklist

  1. Keep an untouched original until you have checked the downloaded result.
  2. Choose the format your destination accepts rather than converting repeatedly.
  3. Start around 75% quality for lossy output, then compare detail and file size.
  4. Use PNG when transparency or pixel-perfect edges matter.
  5. Check the result on a phone and a slower connection before publishing.

Common questions

What is the best image format for a website?

JPG is a dependable choice for photos, while WebP or AVIF can reduce file size when the destination supports modern formats. PNG is useful when you need transparency or lossless output.

Does compressing an image reduce its quality?

Lossy formats such as JPG, WebP, and AVIF trade some image detail for a smaller file. PNG optimization is lossless in PixPact, so its quality setting is not a percentage slider.

Are my images uploaded to PixPact?

No. PixPact decodes, compresses, and exports the image in your browser. The source and result stay on your device unless you choose to download or share them yourself.