Resize every animated WebP frame to one proportional target width while preserving timing and loop count. The new height is calculated from the original canvas aspect ratio and the default policy prevents accidental upscaling that cannot restore source detail. The workflow identifies actual animation structure rather than trusting a filename, runs locally, and returns a clearly named derivative or report while leaving the selected source unchanged.
How to use Animation Resizer
- Choose a genuine animated WebP and review the available animation resizing controls.
- Run the browser-only operation and inspect the reported frame count, duration, dimensions, and loop details.
- Download the result, preview it in the intended destination, and retain the original until the edited animation is approved.
What this tool is good at
When to use Animation Resizer
Prepare a proportionally resized animation for publication
Match a delivery width, reduce decoded pixel cost, or create a smaller responsive derivative while retaining motion timing. Work from the actual animated container and keep the original as the authoritative master until the derivative has been previewed in its destination.
Investigate motion locally
The calculated output height preserves the original canvas aspect ratio and upscaling is disabled by default. This supports evidence-based timing and geometry decisions for client, product, research, or internal assets without transferring image bytes to a conversion endpoint.
Create a repeatable handoff
Save the named output and its reported frames, dimensions, duration, and loop facts beside the publishing task. Resampling may soften detail, optional enlargement cannot create detail, and the new container does not retain metadata.
How to choose the right settings
Preview the complete sequence
Match a delivery width, reduce decoded pixel cost, or create a smaller responsive derivative while retaining motion timing. Check the first-to-last transition as well as individual frames because a technically valid output can still contain a visible jump or distracting loop.
Budget decoded memory
Compressed size does not predict working memory. The browser may hold complete RGBA canvases for every frame, so the workflow enforces frame-count and pixel-frame limits before creating large derivatives.
Test the real destination
Resampling may soften detail, optional enlargement cannot create detail, and the new container does not retain metadata. Autoplay policy, reduced-motion preferences, rendering load, and viewer-specific delay clamping can affect presentation after download.
Practical workflow and output details
Every complete frame is resampled to identical dimensions in Canvas and remuxed locally with the source loop count. Static application code and the local WebAssembly codec may be loaded, but the selected image itself remains in the current browser tab.
The calculated output height preserves the original canvas aspect ratio and upscaling is disabled by default. Resampling may soften detail, optional enlargement cannot create detail, and the new container does not retain metadata. The tool limits its claims to the named operation and never treats successful container creation as proof of visual quality, accessibility, or universal playback behavior.
Format behavior and limitations
The new height is calculated from the original canvas aspect ratio and the default policy prevents accidental upscaling that cannot restore source detail. Resampling can soften fine lines, and enlarging is optional but cannot create missing visual information.
Complete displayed frames are decoded to canvas and remuxed as full-canvas keyframes. This preserves visible motion but does not copy EXIF, XMP, or ICC chunks and can change compression size.
Government and research sources
These references support the format facts, metadata terminology, and privacy context explained on this page. They do not endorse PicConverters.
Documents animated WebP, its ANIM and ANMF chunks, frame geometry, duration, blending, disposal, and loop count.
Research context for real-world use and performance characteristics of modern web image formats including WebP.
Frequently asked questions
Does the Animation Resizer upload my animation?
No. The file is inspected and processed in the current browser tab; PicConverters does not receive its image bytes.
Will the result remain animated?
Yes. The operation requires at least two frames and writes or preserves a genuine animated WebP container.
What should I verify before publishing?
Preview motion, frame timing, dimensions, transparency, and loop behavior in the destination browser. Resampling can soften fine lines, and enlarging is optional but cannot create missing visual information.
Related WebP tools
Animation Cropper
Apply one percentage-based crop rectangle consistently across every complete animation frame.
Animated WebP Compressor
Reduce animated WebP dimensions and optionally sample frames while preserving a genuine timed animation output.
Bulk WebP Resizer
Resize multiple static WebP files to one target width while preserving each source aspect ratio and transparent pixels.