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How your files are processed
Files are uploaded and processed on our servers, then made available for download.
What this tool does
PNG masters straight from cameras or design tools routinely exceed what phones or CMS thumbnails need. Compressing PNG in-place keeps delivery pipelines and galleries snappy without swapping extensions.
Dial quality or effort sliders to match how close viewers will zoom.
- PNG output stays PNG — Pixels stay in the PNG family; optimization adjusts coefficients, palettes, or markup—not the extension.
- Quality or effort controls size — Lossy modes trade visible detail for bytes; lossless modes spend CPU packing the same pixels tighter.
- Dimensions dominate bytes — Pixel count matters as much as quality—oversized dimensions inflate files before compression kicks in.
How to compress PNG files?
- Choose file — select a PNG file that matches this compressor (allowed extensions apply).
- Adjust options — set quality, level, or advanced options if shown, then compress.
- Download — grab the smaller file from your job page when processing completes.
Why compress PNG files?
Lossy passes trim detail you might notice when zoomed; lossless modes keep pixels or paths intact while tightening PNG packing or SVG markup. Prefer one thoughtful compression pass over stacking multiple lossy saves.
Common uses for PNG compression
- Optimize PNG assets before uploading them to a CMS with strict CDN limits.
- Shrink PNG screenshots when embedding them in wiki or doc pages.
- Prepare PNG marketing files under attachment caps without switching formats.
- Archive PNG masters that still must open in legacy tooling.
- Batch lighter PNG copies before handing them to mobile reviewers.
- Reduce PNG file size before syncing folders across a slow connection.
Will compressing PNG (PNG) affect quality?
PNG squeezes bytes losslessly; higher effort spends CPU for smaller files without changing pixels.
Photos exported as PNG stay large; noisy or dithered images compress poorly. Verify transparency edges after “optimization” passes.
How PNG image compression works
What the pixels contain
Pixels arrive with more precision or metadata than delivery requires—EXIF blobs, oversized dimensions, or uncompressed scanlines.
What we optimize
PNG compression is lossless; higher “effort” spends time finding smaller DEFLATE blocks without changing pixels.
Preview on the intended display density. A 4K master scaled to 1080p can often survive a stronger quality step than artwork viewed full-screen on retina hardware.
Troubleshooting
- Already-optimized images may not shrink much: some PNG files were saved with efficient settings already.
- Stronger compression can reduce quality: expect blur, banding, or blockiness at aggressive settings.
- Transparency and metadata: some pipelines may remove metadata; if transparency is required, verify the output format supports it.
- Large images take longer: very high resolution files can take longer to process.