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CompressNConvert

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Image Converter

Convert one image to JPG, PNG, WebP, or AVIF with a quality setting and transparency-safe options.

100% local

Drop one image here

JPG, PNG, WebP, or AVIF · up to 32 MB · adaptive 8–24 megapixel limit

Your image never leaves this browser

Private by design

Images stay in browser memory and are never uploaded by these tools.

Modern formats

Decode and export JPG, PNG, WebP, and AVIF using browser and WebAssembly codecs.

Keep your original

Re-encoding can alter metadata, animation, profiles, or quality, so verify every output.

Complete tool guide

Choosing between JPG, PNG, WebP, and AVIF

Image conversion decodes pixels and encodes them in a new file format. Renaming an extension is not a real conversion.

JPG is broadly compatible for photos, PNG preserves lossless transparency, while WebP and AVIF often provide efficient modern delivery.

Why use this tool?

  • Meet upload format requirements.
  • Preserve or flatten transparency intentionally.
  • Create modern web-ready copies.
  • Adjust lossy output quality.

Common use cases

  • PNG photos to smaller WebP or AVIF.
  • Transparent artwork to PNG.
  • Modern formats to widely supported JPG.
  • Standardizing image libraries.

How to use it

  1. 1

    Choose the source image.

  2. 2

    Select the target format and quality.

  3. 3

    Choose a JPG background if transparency may exist.

  4. 4

    Convert, preview, and test the result in its destination.

Transparency

PNG, WebP, and AVIF can preserve alpha transparency. JPG cannot, so transparent pixels are placed on the selected background.

Conversion limits

Re-encoding can alter metadata, animation, color profiles, bit depth, and compression. It cannot restore detail missing from the source.

Practical tips for better results

  • Keep the original file.
  • Use JPG for photos when maximum compatibility matters.
  • Use PNG for sharp transparent graphics.
  • Test AVIF support in the destination workflow.

Frequently asked questions

Will JPG to PNG improve quality?

No. It prevents new JPEG loss in that output, but cannot recover details already removed.

Why can output be larger?

Different formats optimize different kinds of imagery; compatibility and transparency can matter more than byte size.

Keep working

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