Convert SWF to APNG Online
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Supports: SWF
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Need help?Convert SWF to APNG Online
SWF is Adobe's old Shockwave Flash format — the animation and vector container that powered web games, banner ads, and cartoons until Flash Player reached end of life on December 31, 2020. APNG (Animated PNG) is a modern, lossless animated image that plays natively in current browsers. Converting SWF to APNG rasterizes the Flash timeline into a frame-by-frame animation you can actually open today, without a dead plugin.
SWF Format at a Glance
| Property | Value |
|---|---|
| Full name | Small Web Format / Shockwave Flash |
| Developer | Macromedia, then Adobe |
| Type | Animation + vector container, often with ActionScript |
| Playback runtime | Adobe Flash Player — end of life December 31, 2020; content blocked from running January 12, 2021 |
| Native browser support | None (no modern browser runs Flash) |
| Interactivity | Can be script-driven and interactive, not just a linear animation |
| Best for | Legacy archives only; not a live web format |
APNG Format at a Glance
| Property | Value |
|---|---|
| Full name | Animated Portable Network Graphics |
| Origin | Proposed by Mozilla (Parmenter & Vukićević) in 2004; standardized in the W3C PNG Specification 3rd Edition (Recommendation, June 24, 2025) |
| Compression | Lossless |
| Color / alpha | 24-bit color with full 8-bit alpha transparency |
| Native browser support | ~94.7% of users — Chrome 59+, Firefox 3+, Safari 8+, Edge 79+; not Internet Explorer (per caniuse) |
| Fallback | Non-supporting decoders show the first frame as a static PNG |
| Trade-off | Sharper and truer color than GIF, but usually a larger file than GIF or animated WebP |
How to Convert SWF to APNG
- Upload Your SWF File: Drag and drop your
.swfonto the page or click "Upload" to pick it from your device. - Set the Framerate: Open the Framerate dropdown and choose your playback speed — the default is "10 FPS (Recommended)", which keeps the file size sane; raise it toward 20-25 FPS only if the original animation is fast-moving.
- Adjust Image Quality and Resolution: Use the Image quality (%) slider (default 80) and the Image Resolution controls — keep original, a preset like 768p, or a custom width/height — to balance sharpness against file size.
- Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. No sign-up, no watermark.
Frequently Asked Questions
Why convert SWF to APNG instead of GIF?
APNG keeps full 24-bit color and 8-bit alpha transparency, so gradients and soft edges from a Flash animation stay clean, while GIF is capped at 256 colors and a single hard-edged transparency bit. The trade-off is size: APNG files are usually larger. If you need the smallest possible file and can accept color banding, use SWF to GIF instead.
Will an interactive or game SWF convert correctly?
Only the visible timeline is captured. SWF can be script-driven — buttons, mouse-following objects, branching game logic — and that interactivity cannot survive as a flat image. The converter renders the linear animation it can play back, so a clickable Flash game becomes a passive looping animation, not a playable one.
Does APNG keep the transparent background from my Flash file?
Yes, when the source has transparency. APNG carries a full 8-bit alpha channel, so semi-transparent and anti-aliased edges are preserved rather than being matted onto a solid color the way GIF would force.
Will every browser play the resulting APNG?
About 94.7% of users are on browsers that animate APNG natively — Chrome 59+, Firefox 3+, Safari 8+, and Edge 79+ (per caniuse). The format degrades safely: any viewer that does not support animation, including Internet Explorer, simply shows the first frame as a normal static PNG.
What framerate should I pick for an old Flash animation?
Most Flash content was authored around 12-24 FPS. The 10 FPS default produces a compact, smooth-enough loop for simple animations; bump it up to roughly match the original if motion looks choppy. Higher framerates add frames and grow the APNG file proportionally.
Is APNG smaller or larger than the original SWF?
It depends on the source. A short vector animation can balloon once rasterized to per-pixel frames, while a heavy SWF can shrink. In our testing, a simple 5-second looping SWF banner at 10 FPS and 768p produced an APNG in the low hundreds of kilobytes — but a long, detailed animation can reach several megabytes, since APNG stores lossless frames rather than vectors.
Can I just grab a single still frame instead of the whole animation?
Yes. If you only want one poster image rather than the full loop, use SWF to PNG, which exports a static frame as a lossless image that opens anywhere.
Are my uploaded files kept or shared?
No. Files travel to our servers over an encrypted (TLS) connection, are processed there, and are deleted automatically after a few hours. Nothing is shared, made public, or used for anything beyond your conversion.
Will the resulting APNG loop?
APNG carries a loop count in its animation-control data, where zero means play forever, so a looping Flash animation can be reproduced as a continuous loop rather than a one-shot clip. Any decoder that cannot animate APNG simply ignores the loop and falls back to showing the first frame as a static image.