CleanorTools
Animation

APNG Optimizer

Details

How to use APNG Optimizer

What the tool does, how to run it, and what to expect from the result.

How to reduce the size of an APNG

To reduce an APNG's size, upload the animated PNG, pick a smaller-file or aggressive preset, and export. The optimizer merges duplicate frames, caps the frame rate, and reduces colors to shrink the file while keeping it in PNG format rather than converting it to GIF or video.

APNG carries frame timing, looping behavior, and full-frame image data, so plain static PNG compression is not enough. This tool handles those animation-specific tradeoffs together to get real size savings.

  • Upload one animated PNG (APNG)
  • Choose a lossless, smaller-file, or aggressive preset
  • Export a lighter APNG that stays in PNG format

What the presets change

The presets guide common tradeoffs instead of hiding them. Lossless cleanup keeps color detail, smaller-file mode reduces colors and frame rate modestly, and aggressive mode pushes harder when size matters more than subtle fidelity.

All decoding, frame cleanup, and re-encoding happen locally in your browser, so the animated PNG is never sent to a server. That makes it safe for private or unreleased animations you need to keep on-device.

Tips

Getting a better result out of APNG Optimizer

Specific settings and thresholds, not general advice.

  • Start on Lossless cleanup. It re-encodes the file and strips the extra chunks design tools leave behind while keeping the full color range, so it costs nothing in quality and is often enough on its own.
  • Only drop to Smaller file (256 colors, 20 fps) when lossless cleanup is not enough. Unlike GIF, APNG is not limited to 256 colors, so quantizing the palette is a real quality decision here, not a formality.
  • Frame merge is free weight. Identical consecutive frames, a held pose or a pause, collapse into one longer frame and the playback is unchanged.
  • If the source is a screen recording, cap the frame rate before you cut colors. APNG stores every frame in full, so 30 fps down to 12 fps removes a large share of the data, while a smaller palette shows banding on a gradient immediately.
  • Loop count is a header value, not a size lever. Setting it to 1 makes a reveal or a logo build play once, but it will not save a single byte, so do not reach for it hoping to shrink the file.
  • APNG earns its size where GIF cannot: 24-bit color and real alpha. If the animation is flat-color and fully opaque, a GIF is often the smaller file and the GIF Optimizer is the right tool instead.
Limits

What APNG Optimizer does not do

The honest boundary, so you do not lose time finding it yourself.

  • It does not change the canvas size. The frame keeps its width and height.
  • It does not convert the APNG to GIF, WebP, or MP4.
  • It does not trim or reorder the animation. The only frame change is merging identical consecutive frames.
  • It cannot make a photographic APNG small. APNG stores full frames with no motion compression, so a long or photographic animation is fighting the format, not the settings.
Reference

Terms used on this page

Short, plain-language definitions for the formats and settings above.

Files & formatsAPNGAPNG (Animated PNG) is an extension of the PNG format that stores a short animation in a single file with full lossless color and alpha transparency. It looks sharper than GIF — especially for gradients and translucency — but the files are usually larger.General
At a glance

Who APNG Optimizer is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

People preparing animated stickers, interface loops, motion graphics, and lightweight product or app animations that rely on APNG

Ideal for

Reducing APNG size while keeping the file in PNG format instead of switching the workflow to GIF or video

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

Is the APNG Optimizer free?

Yes. The APNG Optimizer is free with no signup and no watermark, and it runs in your browser with nothing to install.

How do I reduce the size of an APNG?

Upload the animated PNG and pick a smaller-file or aggressive preset. The optimizer merges duplicate frames, caps the frame rate, and reduces colors to compress the APNG while keeping it in PNG format.

Does this keep the APNG format?

Yes. The export stays APNG, so the result remains an animated PNG rather than being converted to a GIF or a video file.

Does this upload my APNG to a server?

No. The animation decode, frame cleanup, and re-encode all happen locally in your browser, so the file never leaves your device.

Will this work on a normal static PNG?

No. This page is for animated PNG files only. For static PNG compression, use a PNG quantizer instead.

How do I make an APNG smaller without losing quality?

Run the Lossless cleanup preset first. It re-encodes the animation and removes chunks the exporter left in, at full color depth, so nothing visible changes. Merging identical consecutive frames is also free. Only after that does cutting the palette or the frame rate start costing you quality.

Is APNG smaller than GIF?

It depends on the content. APNG supports 24-bit color and real alpha, so it looks far better on gradients, soft edges, and transparency, and for those it is usually the smaller file at matched quality. For flat-color, fully opaque animation, a well-optimized GIF is often smaller.

Why is my APNG still large?

Because APNG, like GIF, stores every frame and has no motion compression across the timeline. A long clip or a photographic animation will stay heavy however it is tuned. Shorten it, crop it, or use a video format.

Do all browsers support APNG?

Yes. Chrome, Edge, Firefox and Safari all play APNG, and a browser that does not will show the first frame as a normal PNG rather than break, which is why APNG is a safe upgrade from GIF for transparency.

What frame rate should I cap an APNG at?

12 to 20 fps for UI recordings and interface demos, which is where most of the size is and where the drop is hardest to notice. Leave the frame rate alone for fast motion or anything filmed.

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