Free WebP Compressor
Compress static WebP
for practical web delivery.
Re-encode batches of existing static WebP assets with a clear quality control, optional resizing, and WebP output throughout the workflow.
- Static WebP validation
- WebP output retained
- Same-origin module Worker
WebP Compressor workspace
This page uses the browser WebP quality encoder. It does not expose a separate lossless-mode switch.
Images
Three clear steps
How to use the webp compressor
The entire workflow stays in the current browser tab, from selection through download.
Choose static WebP files
Add existing WebP assets. Animated WebP and files whose signatures identify another format are rejected.
Tune quality or width
Adjust the WebP quality control and optionally cap dimensions for the intended layout.
Review the WebP output
Inspect the new size and preview visual detail before downloading the re-encoded asset.
Where WebP fits
A focused workflow for existing web assets
WebP supports both lossy and lossless coding, but this page implements the browser quality-encoding path for static WebP files only.
Hero and content imagery
Tune existing WebP files for responsive pages, articles, or product layouts. Smaller payloads transfer fewer bytes, but every result still needs review.
Reusable interface assets
Keep WebP output consistent when reviewing batches prepared for a web asset library.
WebP with alpha
The WebP output path can retain transparent pixels without introducing a JPEG matte.
WebP behavior
Efficient sources may have limited room to shrink
WebP is already designed for compact web delivery. Prior quality, image complexity, alpha, and dimensions all affect a second encode.
Quality can trade detail for size
Lower settings may reduce size while increasing smoothing or artifacts in detailed areas.
Not exposed as a separate mode
The format supports lossless coding, but ImagePhix does not claim or provide a lossless-mode selector in this release.
Static files only
Animated WebP is identified and rejected instead of losing frames during a canvas re-encode.
Quality strategy
Match WebP settings to the visible asset
Small thumbnails and large feature images tolerate different tradeoffs. Evaluate the output at the size and background where it will appear.
Watch texture and gradients
Fine patterns, soft gradients, and text overlays can reveal changes as quality drops.
Avoid shipping unused pixels
A maximum width can help when the source is much wider than its largest intended display size.
Keep the smaller result only when useful
Already-compressed WebP can become larger after re-encoding, so use the reported byte comparison.
Current boundaries
Static, same-format WebP only
The page stays within the verified browser encoder instead of promising every WebP coding mode.
- 20 files per batchEach file can be up to 100 MB.
- Up to 64 megapixelsNo side may exceed 16,384 pixels.
- Metadata is not retainedOutputs are newly encoded; keep originals when metadata matters.
- Animated WebP is rejected and never flattened to a still frame.
- JPEG and PNG inputs are rejected; this page does not convert them to WebP.
Questions, answered
WebP Compressor FAQ
Concise answers about the behavior and boundaries of this specific workflow.
Does ImagePhix support lossless WebP compression?
The WebP format supports both lossy and lossless encoding. This ImagePhix workflow exposes the browser quality-based encoding path and does not offer a separate lossless-mode selector.
Does WebP compression reduce image quality?
The browser quality-based path can discard image detail. Lower settings may reduce file size further, but text, texture, and gradients should be inspected for visible change.
Can WebP preserve transparency?
Yes. WebP supports transparency, and the ImagePhix WebP output path retains alpha-capable output without applying a JPEG matte.
Can ImagePhix compress animated WebP?
No. Animated WebP is detected and rejected so frames are not silently discarded or presented as an optimized animation.
Why did my WebP file become larger?
Existing WebP files may already use efficient settings. Detail, transparency, dimensions, and the selected quality can make a re-encoded file similar in size or larger.
Can I resize WebP while compressing it?
Yes. The maximum-width control reduces WebP images that exceed the selected width and never enlarges smaller images.
Can I process multiple WebP files at once?
Yes. You can add a batch of static WebP files, and ImagePhix validates and processes each image locally in your browser.
Are WebP images uploaded?
No. Selected WebP files are processed locally in your browser and are not uploaded to ImagePhix.
Back to the tool
Ready to tune a WebP asset?
Return to the WebP workspace, adjust the quality, and inspect the result at its intended size.