Compress PNG Online - Reduce Transparent PNG File Size | Piczilo
PicziloImages made lighter.

Image compressor

Compress PNG

Make a PNG smaller without uploading it or unexpectedly converting it to JPG. Piczilo re-encodes PNG images locally in your browser, preserves transparent areas, keeps dimensions unchanged by default, and downloads a compressed PNG.

PNG inputBrowser-only

Choose an image

Choose one image to compress locally.

Step 1 of 2
Choose one image to compress locally.

Local processing

Runs inside your browser

No upload

No upload route or public result URL

Custom settings

Fixed PNG output with optional size limits

Simple process

How it works

  1. 1

    1

    Choose a PNG image from your device.

  2. 2

    2

    Piczilo validates the file and keeps the output format locked to PNG.

  3. 3

    3

    Optionally set maximum dimensions if the existing size controls fit your workflow.

  4. 4

    4

    Download the compressed PNG created locally while preserving transparency.

Useful for

  • Making transparent PNG logos, icons or UI graphics smaller for websites.
  • Reducing PNG screenshots before adding them to documents or portals.
  • Preparing PNG images for upload rules while keeping transparency and dimensions by default.

Limitations

  • Only PNG files are accepted on this tool.
  • Browser PNG export is lossless, so some already optimized PNGs may not shrink much.
  • Large transparent PNG files can use significant browser memory while processing.

Learn more

Helpful guides

Practical guides that explain the format and file-size decisions behind this tool.

How to Reduce Image File Size Without Losing QualityA practical guide to resizing, compression, JPG, PNG and WebP so images stay clear without carrying unnecessary file size.Read guideJPG vs PNG vs WebP: Which Image Format Should You Use?A practical format comparison for photos, transparent graphics, website images and everyday file-size decisions.Read guide

Questions

Frequently asked questions

Yes. Piczilo reads, re-encodes and prepares the PNG download locally in your browser, so the image is not uploaded to a server.

Yes. PNG output preserves transparent areas and does not flatten them onto a background.

No. This tool accepts PNG input and creates PNG output, so transparency and PNG compatibility are preserved.

PNG compression in the browser is lossless. If the source file was already optimized, there may be little removable data left.

Yes. Dimensions are unchanged by default unless you intentionally use the advanced size controls.

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