PNG files are large because the format is designed for lossless quality — every pixel is preserved exactly. That's great for screenshots, logos, and graphics with text, but it results in files that are 5–20× larger than JPEG for the same image. The good news: you can significantly reduce PNG file size without any visible quality loss using the right compression techniques.

Why PNG Files Are So Large

PNG uses lossless compression — it can reconstruct the original image pixel-perfectly. This comes with a size cost:

Full color information preserved — PNG stores all pixel data without discarding any. A 1920×1080 PNG with 32-bit color has over 8 MB of raw pixel data before compression.
Deflate compression limits — PNG uses the Deflate algorithm (same as ZIP files). It's lossless and effective, but has a ceiling — there's only so much redundancy to compress away.
Alpha channel overhead — PNGs with transparency carry a full 8-bit alpha channel per pixel, adding 25% to the data volume compared to RGB-only images.

PNG Compression: Lossless vs. Lossy

There are two approaches to making PNG files smaller:

Lossless PNG optimization — Re-compresses the PNG with more aggressive Deflate settings and removes unnecessary metadata (EXIF, color profiles, comments). No pixel data changes. Typically achieves 15–40% reduction. This is what most "PNG compressor" tools do.
Lossy PNG compression — Reduces the color palette using quantization (pngquant technique). Converts 24-bit PNG (16.7M colors) to 8-bit (256 colors) with intelligent dithering. Achieves 60–80% reduction. Results look excellent for most graphics, but gradients may show slight banding.

Picovert's image compressor applies optimized compression to PNG files while preserving full visual quality for most use cases.

How to Compress PNG Without Losing Quality

Open Picovert's image compressor — free, no account.
Drop your PNG file (or multiple PNGs for batch compression).
The compressor applies lossless optimization: better Deflate compression and metadata stripping. The output PNG is pixel-identical to the input.
Download the compressed PNG.

All processing runs in your browser — no files are uploaded to any server.

How Much Can PNG Files Be Compressed?

Results vary significantly by image type:

Screenshots and UI graphics — Large flat areas of color compress extremely well. A 2 MB screenshot typically compresses to 800 KB–1.2 MB losslessly, and to 300–500 KB with palette reduction.
Logos with transparency — Simple logos (limited colors, transparency, no gradients) often compress 50–70% losslessly because they have so much uniform data.
Photos saved as PNG — Photos have high color complexity — little redundancy for lossless compression to exploit. A photo saved as PNG might only compress 10–20% losslessly. This is why photos should use JPG or WebP instead.
Diagrams and illustrations — Moderate compression. Results depend on color complexity and how many gradients are present.

Should You Compress PNG or Convert to WebP/AVIF?

For web use, converting PNG to a modern format often beats compression alone:

PNG → WebP: WebP supports lossless compression and transparency, just like PNG, but with 25–35% better compression. For graphics used on web pages, converting PNG to WebP is usually the best approach. WebP is supported by all modern browsers.
PNG → AVIF: AVIF supports lossless mode with even better compression than WebP. For cutting-edge web optimization, PNG to AVIF gives the smallest files. Browser support is slightly narrower (Safari 16+).
Keep PNG when: You need maximum compatibility (email attachments, legacy systems), you're working in design tools that require PNG, or the file will be further edited (no generation loss).

Removing Metadata to Reduce PNG Size

PNG files often contain embedded metadata that isn't needed for display: EXIF data from cameras, color profile chunks (iCCP), creation timestamps, and software comments. These can add 5–50 KB per file — significant for small graphics. Compression tools like Picovert strip this metadata automatically unless you need it preserved.

PNG Compression for Websites

For web performance (Core Web Vitals), PNG file size directly impacts Largest Contentful Paint (LCP). Recommendations:

Hero images and backgrounds: convert to WebP or AVIF — don't use PNG for large photos.
Logos and icons: SVG is even smaller than PNG for vector graphics and scales perfectly. For raster logos, optimize PNG and consider WebP.
Inline images (content): compress PNG or use WebP with a PNG fallback.
Favicon: PNG is fine — browsers only download it once and cache it long-term.

Batch Compress PNG Files

For compressing multiple PNG files at once — website assets, design exports, product photos — Picovert's compressor handles batch processing. Drop all your PNGs at once and download each compressed file individually. The browser-based processing handles files in parallel, so batch compression completes quickly.