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OptiPNG vs Preview

Professional comparison and analysis to help you choose the right software solution for your needs.

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OptiPNG
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Preview

OptiPNG vs Preview: The Verdict

Last updated: May 2026 · Comparison by Sugggest Editorial Team

Feature OptiPNG Preview
Sugggest Score — —
Category Photos & Graphics Office & Productivity
Pricing Free Open Source

Product Overview

OptiPNG
OptiPNG

Description: OptiPNG is an open-source PNG optimizer that reduces the file size of PNG images while preserving transparency. It works by applying lossless compression and interpolation methods.

Type: software

Pricing: Free

Preview
Preview

Description: Preview is a free and open-source document viewer application for macOS. It allows quick viewing of multiple file formats including images, PDFs, Markdown files, Office documents, and more. Preview has basic editing capabilities and annotation tools for PDFs.

Type: software

Pricing: Open Source

Key Features Comparison

OptiPNG
OptiPNG Features
  • Lossless compression of PNG images
  • Removes unnecessary metadata
  • Optimization of IDAT chunk ordering
  • Interlacing optimization
  • Color palette optimization
  • Grayscale conversion
  • Bit depth reduction
Preview
Preview Features
  • View PDFs, images, text files and more
  • Annotate PDFs with shapes, text boxes, signatures
  • Basic image editing tools
  • Fill out and sign PDF forms
  • Combine PDFs and export as PDF or other formats
  • Tabbed interface to view multiple files
  • Quick Look support to preview files
  • Built-in screen capture tool

Pros & Cons Analysis

OptiPNG
OptiPNG
Pros
  • Significantly reduces PNG file sizes
  • Lossless optimization preserves image quality
  • Open source and free
  • Works on Linux, Mac and Windows
  • Easy to use with command line interface
  • Can process multiple PNG files at once
Cons
  • Command line only, no GUI
  • Fewer features than some paid PNG optimizers
  • Slower than some alternatives
  • Requires technical knowledge to use command line
  • Not ideal for optimizing PNGs in bulk
Preview
Preview
Pros
  • Free and included with macOS
  • Fast and lightweight
  • Supports many common file formats
  • Useful annotation and editing tools
  • Easy to use interface
Cons
  • Limited functionality compared to paid alternatives
  • Lacks advanced PDF editing features
  • No OCR for scanning text in images
  • No collaboration tools

Pricing Comparison

OptiPNG
OptiPNG
  • Free
Preview
Preview
  • Open Source

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Learn More About Each Product

OptiPNG
OptiPNG
Reviews, pricing & alternatives →
Preview
Preview
Reviews, pricing & alternatives →

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