PNG Lossless Optimizer
Local ProcessingStrip auxiliary metadata chunks (tEXt, zTXt, iTXt) from PNG files losslessly without touching pixel data.
How It Works & Processing Standards
Strip auxiliary metadata chunks (tEXt, zTXt, iTXt) from PNG files losslessly without touching pixel data.
Tool processing runs in your browser. If you create a calculator or conversion share link, its values are included in the URL. See the privacy policy for account, analytics and advertising data.
Current Limits
- Desktop max file size: 40MB
- Mobile max file size: 20MB
Strips extra information left by editors to make the file a little lighter. Image data itself is not recompressed, so savings may be small depending on the file.
For big reductions, use Reduce Image File Size with a format such as WebP.
What You Can Do
- Fully lossless
- Pixel data (IDAT) is kept; only ancillary chunks are removed.
- Report
- Shows chunks removed and bytes before and after.
How to Use PNG Lossless Optimizer
- 1Pick a PNGSelect the PNG file.
- 2Check the resultSee the bytes saved.
- 3DownloadSave the optimised PNG.
Examples
Common Use Cases
- Removing unnecessary data from PNGs for the web
- Sharing without editor history or author info
Frequently Asked Questions (FAQ)
The size barely changed.
PNGs with few ancillary chunks have little to remove. The tool never changes quality, so its savings are limited.
Are my photos uploaded?
No. Images are processed only inside this browser and never transmitted.