Convert PNG to Interlaced PNG

Convert PNG to Interlaced PNG | Online Free Tool | Elysia Tools

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, range, checkbox
Output type: file
Sample coverage: 4
API ready: Yes

Overview

Optimize your web images by converting standard PNG files into interlaced PNGs, which use the ADAM7 algorithm to allow images to appear gradually as they load, significantly improving perceived performance for users on slower connections.

When to use

When you want images to display a low-resolution preview before the full file finishes downloading.
When optimizing website assets to improve user experience on high-latency mobile networks.
When you need to balance image quality with progressive rendering capabilities.

How it works

1Upload your standard PNG image file to the tool.
2Adjust the compression level and quality settings to suit your specific file size requirements.
3Enable adaptive filtering to ensure the most efficient encoding for the interlaced structure.
4Process the file to generate an interlaced PNG that renders progressively in web browsers.

Use cases

Improving the perceived loading speed of large hero images on landing pages.
Enhancing user experience for mobile users accessing image-heavy web content.
Preparing web graphics that need to remain visible and recognizable even during slow network conditions.

Examples

1. Optimizing Hero Banners

Web Developer

Background

A website hero banner is taking too long to load, leaving a blank space for users on mobile devices.

Problem

The image is too large and loads all at once, causing a poor user experience.

How to use

Upload the hero image, set compression to 9, and enable adaptive filtering to generate an interlaced version.

quality: 85, compressionLevel: 9, adaptiveFiltering: true

Outcome

The image now renders a low-resolution preview immediately, keeping the user engaged while the full-quality image loads.

2. Reducing Perceived Latency

UI/UX Designer

Background

A product gallery page contains high-resolution PNG icons that appear abruptly once fully loaded.

Problem

The sudden appearance of images creates a jarring visual jump for the user.

How to use

Convert the icons to interlaced PNGs to allow for a smooth, progressive fade-in effect.

FAQ

What is an interlaced PNG?

An interlaced PNG uses the ADAM7 algorithm to store image data in a way that allows the browser to display a blurry, low-resolution version of the image before the entire file is downloaded.

Does interlacing increase file size?

Interlacing can slightly increase the file size compared to a non-interlaced PNG, but it provides a much better perceived loading experience for the end user.

What is the recommended compression level?

A compression level of 9 is recommended for interlaced images to ensure the best balance between file size and image quality.

Can I convert multiple images at once?

This tool is designed to process one PNG image file at a time.

Is the image quality lost during conversion?

You can control the output quality using the quality slider, allowing you to maintain high visual fidelity while enabling the interlaced feature.

quality: 90, compressionLevel: 9, adaptiveFiltering: true

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Inputs

Result

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

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Optimizing Hero Banners

2. Reducing Perceived Latency

FAQ

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