Pic to APNG Converter

Convert PNG, JPG, and other formats to animated APNG images offline.

Drag & Drop Your Images Here

Supports PNG, JPG, WEBP, GIF, BMP, SVG, TIFF (Max 20MB per file)

Queue (0 frames)

Frame	File Info	Original Size	Actions

Transformation Settings

Frame Delay (ms)

Duration of each frame in milliseconds (1000ms = 1 second).

Loop Repetitions

Set 0 for infinite looping animation, or a specific count.

Dimensions

Width (px)

Height (px)

Lock Aspect Ratio

Resize Fitting Mode

Frame Transforms

Background Options Keep Transparency

1. What is Animated PNG (APNG) and how does it compare?

Animated Portable Network Graphics (APNG) is an extension of the widely used Portable Network Graphics (PNG) format. It provides support for animated images, offering key features that overcome the limitations of the older GIF format.

While standard GIFs are restricted to a maximum of 256 colors and support only 1-bit binary transparency (either a pixel is fully visible or fully transparent), APNG supports full 24-bit TrueColor image assets and 8-bit alpha transparency. This results in smoother color transitions, high-resolution rendering, and semi-transparent anti-aliased outlines that blend perfectly into any website background.

2. Chunk structure of APNG files

APNG retains compatibility with standard PNG decoders by using a fallback frame technique. If an application does not support APNG, it will display the first frame as a static PNG. The file format introduces three new chunks:

acTL (Animation Control Chunk): Placed before the first standard image data chunk. It defines the number of animation frames and loop iterations.
fcTL (Frame Control Chunk): Precedes each frame. It specifies frame dimensions, canvas position offsets, delays, and how the frame blends or clears after display.
fdAT (Frame Data Chunk): Stores compressed image data for subsequent frames (frames 1 and onwards), prefixed by a frame sequence number for alignment verification.

3. SEO and Performance Benefits of APNG

By offering lossless compression and full alpha blending, APNG is ideal for UI demonstrations, mockups, animations, and high-fidelity graphics. Unlike large, uncompressed video elements (like MP4 or WebM), APNG files can be directly embedded using standard `` tags. This reduces page load latency, improves Largest Contentful Paint (LCP) performance, and provides a secure, lightweight alternative for modern web layouts.

APNG Specifications

MIME Type

image/apng (also falls back to image/png)

Color Depth

24-bit TrueColor with full 8-bit alpha transparency channel.

Compatibility

Supported natively by Chrome, Safari, Firefox, Edge, and iOS/Android web views.

Frequently Asked Questions

What is an APNG file?

APNG (Animated Portable Network Graphics) is a file format that extends the standard PNG specification to support animations. It offers higher color fidelity (24-bit) and full alpha transparency (8-bit) compared to GIFs.

How does this converter assemble APNGs offline?

Our converter converts each of your uploaded frames into standard PNG bytes locally. It then parses these PNG byte streams to extract standard chunks, calculates CRC32 checksums, and dynamically joins them together with animation header chunks (acTL and fcTL) directly inside your browser.

What is the advantage of APNG over GIF?

APNG supports 24-bit TrueColor and full alpha transparency, which prevents the pixelated, jagged borders often seen in transparent GIFs. It also compresses animated content more efficiently than GIFs in many cases.

Will old browsers display APNG files?

Yes, APNG has built-in backward compatibility. Older software or browsers that do not support APNG animations will simply render the first frame of the animation as a standard static PNG image.

How do I set the delay between animation frames?

You can configure the delay dynamically in the "Transformation Settings" panel on the right. The delay is set in milliseconds (e.g. 500ms creates a 2-frames-per-second speed).

Is it safe to convert my images here?

Absolutely. The image reading, frame rendering, chunk parsing, and APNG byte compilation happen entirely client-side inside your browser sandbox. None of your files are sent to a server, providing complete privacy.