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Convert PNG to Palette-based PNG

· Last updated：2025-10-10

Convert PNG images to palette-based format with indexed colors for smaller file size

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Written by the Elysia Tools team
Image355
Color214
Compression131
Size88
PNG63
File Size39

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Media
Input types
file, number, range, checkbox
Output type
file
Sample coverage
4
API ready
Yes

Overview

Optimize your web graphics by converting standard PNG images into palette-based PNGs, effectively reducing file size through indexed color mapping without sacrificing visual integrity.

When to use

  • Reducing the file size of web assets for faster page loading.
  • Preparing images for legacy systems or hardware that require indexed color formats.
  • Optimizing graphics with limited color palettes, such as icons, logos, or pixel art.

How it works

  1. 1Upload your source PNG image file.
  2. 2Adjust the color count, quality, and compression settings to balance file size and visual fidelity.
  3. 3Enable dithering if you need smoother gradients with a restricted color palette.
  4. 4Process the file to generate an optimized, palette-based PNG.

Use cases

  • Compressing UI icons and interface elements for mobile applications.
  • Optimizing website banners and logos to improve Core Web Vitals.
  • Converting high-color illustrations into efficient indexed formats for game assets.

Compare alternatives

  • Convert JPEG images to PNG format with transparency support and lossless compression

  • Convert PNG images to 8-bit color depth for smaller file size and better compatibility

  • Convert PNG images to AVIF format with next-generation compression and superior quality-to-size ratio

Who it's for

Best for

  • Convert images in the browser.
  • Repeatable jobs with images and the same settings every time.
  • Jobs where the output is a downloadable file.

Not ideal for

  • Fully automated batch jobs — this page is built for interactive use; use the API endpoint for scripts.
  • Files in formats this tool does not accept — it works with .png input.

Edge cases & common failures

  • Very large files

    Large files take longer and can hit browser memory limits — try a smaller sample first.

  • Skipping the output check

    Compare the first rows or pages of the output with the input before using it in production.

  • Files from unusual exporters

    Some files use format variants that do not convert cleanly — if the output looks wrong, re-save the file from the app that created it and try again.

Examples

1. Optimizing Web Icons

Frontend Developer

Background

A website uses several high-resolution PNG icons that are slowing down initial page load times.

Problem

The icons are unnecessarily large because they use full 24-bit color depth.

How to use

Upload the icons and set the color count to 64 with dithering enabled to maintain visual quality while shrinking the file size.

colors: 64, dithering: true, compressionLevel: 9

Outcome

The icons retain their sharp appearance while the file size is reduced by over 60%, leading to faster page rendering.

2. Reducing Asset Size for Retro-Style Game

Game Artist

Background

Creating a pixel-art game where assets need to fit a specific memory budget.

Problem

Standard PNG exports are too heavy for the game's performance requirements.

How to use

Convert the artwork to a palette-based PNG using 32 colors and maximum compression.

FAQ

What is a palette-based PNG?

It is an image format that uses an indexed color table (palette) instead of storing full color data for every pixel, significantly reducing file size.

How does reducing the number of colors affect my image?

Lowering the color count reduces the file size but may cause color banding or loss of detail in complex images like photographs.

What does dithering do?

Dithering simulates colors not present in the limited palette by mixing available colors in a pattern, creating the illusion of smoother gradients.

Can I choose any number of colors?

Yes, you can specify any value between 2 and 256 colors to suit your specific optimization needs.

Is there a limit to the file size I can upload?

You can upload PNG files up to 50MB for processing.

Hub

Image Encoding Tuning for Weight, Loading, and Delivery

Tune PNG bit depth, palette, and transparency, choose progressive or baseline JPEG loading, dial WebP quality modes, and compress TIFF for archives until every image fits its destination.

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colors: 32, compressionLevel: 9, dithering: false

Outcome

The game assets are significantly smaller, fitting within the memory constraints without losing the intended pixel-art aesthetic.

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