Compress PNG Online

1. Upload one or more PNG files (up to 50 MB total).
2. Click 'Compress PNG' — the optimizer runs in a few seconds per image.
3. Download the smaller PNG files, or grab all as a ZIP.

PNG uses lossless compression, so aggressive re-encoding can reduce file size by 20-70% without any visible change — the pixels are identical, only the storage is more efficient. Lossless PNG optimization never loses quality.

PNG files are often larger than necessary because different encoders produce different results from the same source. Optimizing the PNG encoding (better filters, zlib tuning, metadata removal) can reduce file size by 20-70% without changing a single pixel. This matters most for web assets (faster page loads), app resources (smaller bundles), and archives (more efficient storage).

The compressor decodes the PNG and re-encodes it using oxipng with aggressive filters, zlib tuning, and metadata stripping. All optimizations are lossless — the decoded pixels are byte-identical to the source. The file size reduction comes from better compression, not quality loss.

• Optimizing PNG logos and icons for websites.
• Reducing PNG file size for app bundles.
• Preparing PNG assets for CDN delivery.
• Shrinking a PNG-heavy asset library.
• Reducing backup size without quality loss.
• Optimizing design exports before handoff.
• Preparing PNG images for email without visible compression.

PNG optimization is lossless. The pixels in the compressed PNG are byte-identical to the source — there is no quality degradation. Some tools offer lossy PNG compression (which converts to 8-bit palettes); our compressor stays fully lossless for maximum quality preservation.

• Simple PNG files (icons, flat graphics) may already be optimized and won't shrink much.
• Very small PNGs (under 5 KB) may not benefit from optimization.
• Animated PNG (APNG) files use only the first frame.
• PNG is still larger than JPG or WebP for photographs — use those formats for photos.
• Metadata (EXIF, XMP) is stripped by default — the pixels are preserved but metadata is removed.

• Output PNG opens on every device and in every application.
• No quality difference from the source — visually and byte-identical pixels.
• Ideal for web assets, app resources, and design files.
• Works with every CMS, marketplace, and upload form.
• Suitable for archival where lossless quality matters.

• PNG optimization is lossless — no quality is lost.
• For maximum reduction, use the 'Maximum' optimization level.
• For photographs, consider WebP or JPG instead of PNG (smaller).
• Batch-compress up to 50 MB of PNG files at once.
• Metadata is stripped — good for privacy, but back up your original if metadata matters.

Need to hit an exact size? Use our dedicated target-size tools:

PNG is barely smaller after compression

The source may already be optimized. Try the 'Maximum' level, or use JPG or WebP for photos (much smaller).

EXIF metadata is missing from the output

Metadata is stripped by default for maximum size reduction. If you need metadata preserved, keep the original PNG.

Compressed PNG looks slightly different in some viewers

PNG optimization is lossless, so pixels are identical. Any visual difference indicates a viewer issue, not a file issue.

• W3C — PNG Specification
• oxipng — Lossless PNG optimization