Resize Animated WebP

How this works

This tool reads the RIFF chunk structure of an animated WebP directly in JavaScript: it walks the VP8X, ANIM, and ANMF chunks to recover every frame's position, duration, and blend/dispose flags, decodes each frame with the browser's native WebP decoder, and composites frames in order so the preview matches the source exactly — including partial-frame updates and background disposal. Each composited frame is then resized on a canvas using your chosen fit mode, re-encoded, and re-packed into a fresh WebP animation container (or converted to GIF/APNG/PNG frames), so the whole pipeline runs locally without any upload.

Resize Animated WebP Online

Animated WebP images provide excellent compression while supporting animation, transparency, and high visual quality. They're widely used on websites, messaging platforms, and modern web applications because they are significantly smaller than animated GIFs while maintaining smoother animation. However, resizing an animated WebP correctly requires processing every frame while preserving animation timing, transparency, and loop settings.

Our Resize Animated WebP tool makes this process simple. Everything runs directly inside your browser, so your files never leave your device. Upload one or multiple animated WebP files, choose the new dimensions, adjust quality, preview the result, and export the resized animation in WebP, GIF, APNG, or PNG sequence format.

Unlike many online image resizers that only process the first frame, this tool resizes every frame while keeping animation smooth and synchronized.

Key Features

• Resize animated WebP files entirely in your browser
• Batch process multiple animations simultaneously
• Maintain every animation frame automatically
• Preserve frame duration and playback timing
• Maintain transparency (alpha channel)
• Resize using exact pixel dimensions
• Resize using percentage scaling
• Lock or unlock aspect ratio
• Custom aspect ratio support
• Set maximum width and height limits
• Fit, Fill, Stretch, or Center Crop resizing modes
• Rotate animation during resizing
• Horizontal and vertical flip options
• Transparent or colored padding background
• Adjust WebP quality before exporting
• Control playback speed
• Target maximum output file size
• Generate side-by-side preview before downloading
• Preview resized animation before export
• Export as Animated WebP
• Export as Animated GIF
• Export as Animated PNG (APNG)
• Export frames as PNG sequence
• Extract original animation frames
• Batch export all processed files
• No server upload required
• Works on Windows, macOS, Linux, Android, and iOS

How to Resize an Animated WebP

1. Upload one or more animated WebP files.
2. Review the animation metadata such as dimensions, frame count, duration, and loop settings.
3. Select whether to resize using pixels or percentage.
4. Choose the desired resize mode (Fit, Fill, Stretch, or Center Crop).
5. Adjust quality, playback speed, or target file size if required.
6. Generate a preview to compare the original and resized animation.
7. Download the result as WebP, GIF, APNG, or PNG frames.

Worked Example

Suppose you have an animated WebP banner with these properties:

• Original size: 800 × 600 pixels
• Frames: 48
• Duration: 2.4 seconds
• File size: 3.8 MB

Your website only needs a banner that's 400 × 300 pixels.

Choose the following settings:

• Resize Mode: Pixels
• Width: 400 px
• Height: 300 px
• Maintain Aspect Ratio: Enabled
• Quality: 85%
• Playback Speed: 1×
• Export Format: Animated WebP

After processing, the animation retains all 48 frames, keeps the original timing and transparency, and the final file size is significantly reduced while maintaining excellent image quality.

Best Practices

• Keep the aspect ratio locked unless intentional stretching is required.
• Use WebP output whenever browser compatibility allows.
• Lower quality gradually to reduce file size without noticeable quality loss.
• Preview animations before downloading.
• Use "Fit" mode for logos and UI assets.
• Use "Center Crop" for profile pictures and thumbnails.
• Resize from the original animation instead of repeatedly resizing previously compressed files.
• Use batch processing when preparing multiple animations for websites.

Common Errors to Avoid

• Ignoring the aspect ratio: Disabling aspect ratio lock when it isn't necessary can stretch or squash the animation.
• Choosing extremely low quality: Very low quality settings may introduce visible compression artifacts and blurry frames.
• Using Stretch mode unintentionally: Stretch forces the animation into the specified dimensions and can distort characters, icons, or logos.
• Setting playback speed incorrectly: Increasing or decreasing playback speed changes how the animation feels. Preview it before exporting.
• Cropping important content: When using Center Crop or Fill mode, verify that important parts of the animation remain visible.
• Resizing multiple times: Always resize from the original file instead of repeatedly resizing an already compressed animation.
• Selecting the wrong export format: Use Animated WebP for the smallest files, APNG when lossless transparency is required, and GIF only for compatibility with older platforms.
• Setting unrealistic target file sizes: Extremely small file size limits can noticeably reduce image quality.

Why Use This Animated WebP Resizer?

Many online image resizers only resize the first frame of an animated WebP, effectively converting it into a static image. This tool processes every frame individually while preserving timing, transparency, loop count, and animation quality. Because everything runs locally in your browser, you get faster processing, improved privacy, and no file size limits imposed by server uploads.

Whether you're optimizing website assets, preparing social media graphics, reducing download sizes, or creating responsive animations, this tool provides an easy way to resize animated WebP files without installing desktop software.

Frequently Asked Questions(FAQ)