PixelForgeImage Data Studio
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Compress & Optimize

Lossless PNG Compressor

Lossless size reduction for PNG images.

Drop images to compress

Supports JPG, PNG, WebP, HEIC, TIFF and more · Max 40 MB MB

What is Lossless PNG Compressor?

Lossless size reduction for PNG images. Strip PNG metadata and recompress DEFLATE for 15–40% smaller PNGs. Optimize logos, icons and UI assets without a single pixel change. A bit-identical PNG that renders exactly the same pixels.

All processing happens locally in your browser. Your images are never uploaded to any server.

Key Features

  • True lossless — pixels are guaranteed unchanged
  • Strips ancillary chunks but preserves alpha and gamma
  • Best as a first pass before WebP/AVIF conversion

Common Use Cases

  • Reducing PNG file sizes for websites without sacrificing any pixel data or transparency
  • Optimizing UI assets, sprites, and icons for web and mobile apps
  • Shrinking PNG screenshots and diagrams before adding them to documentation or wikis
User Guide

How to use this tool

The Lossless PNG Compressor removes bytes from PNG files without changing a single pixel. It rearranges the internal PNG chunk stream, strips metadata, and re-runs the DEFLATE compression at maximum effort — giving you smaller PNG files that are byte-for-byte visually identical to the source.

How to use it

Drop one or many PNG files onto the upload zone. Each file is re-encoded with an optimized zlib strategy, discarded ancillary chunks (tEXt, tIME, iTXt) are removed, and any redundant palette entries are pruned. The output is guaranteed to render pixel-identical to the original.

The savings panel reports the file-size reduction per image. Realistic savings range from 5% (already-optimized PNGs) to 40% (screenshots straight from macOS or Windows). Batch-download every optimized PNG as a ZIP for easy transfer.

  • Truly lossless — every pixel remains identical
  • Strips unused metadata chunks and palette entries
  • Applies maximum-effort DEFLATE re-compression
  • Great for icon sets, diagrams and logo libraries

When to prefer lossless over lossy

Choose lossless when the image contains text, thin lines, flat colors or brand assets — anything where a single degraded pixel would be noticeable. UI screenshots, logo variants and technical diagrams are the classic use cases.

For photographic PNGs where perfect fidelity is not required, our WebP or AVIF converters will typically produce files 60–0% smaller than even the best lossless PNG optimization.

Frequently Asked Questions

How is lossless possible?

PNG uses DEFLATE; we try more aggressive compression settings that other tools skip.

Will it reduce quality?

Never. If any pixel differs after compression, we fall back to the smaller of the two.

What does lossless PNG compression mean?

Lossless compression reduces file size by optimizing how pixel data is encoded — using better filtering, DEFLATE compression, and palette optimization — without changing any pixel values. The output image is visually identical to the input.

How much can PNG file size be reduced?

Typical savings range from 20–60% depending on the image. Screenshots, diagrams, and images with large flat areas see the biggest reductions. Photographic PNGs may see smaller gains.

Is this better than TinyPNG?

We use similar lossless techniques (PNG quantization and DEFLATE optimization). The key difference is that your images never leave your browser — no upload, no privacy concerns, and no file size limits.

Is this tool free to use?

Yes. This tool is completely free with no sign-up, no watermarks, and no daily limits. All processing runs locally in your browser.

Will the compressed PNG look different?

No. Lossless compression only changes how the bytes are packed, not the pixel values.

Why did some files barely shrink?

They were already optimized by another tool. Diminishing returns are normal after the first pass.

Related Image Tools

Image Compressor

Universal image compressor — like TinyPNG in your browser.

WebP Compressor

Optimize WebP images for the web.

Bulk Image Resizer

Batch resize multiple images at once.

Remove EXIF Data

Strip metadata & GPS location from photos.

Optimize Images for Web

One-click resize + compress for web pages.