Compress WebP Image

The tool re-encodes your WebP image in memory using the quality level and compression mode you select. In lossy mode, the encoder analyzes pixel data and discards information that human vision is least sensitive to, then writes a new WebP file. In lossless mode, it removes structural redundancy without altering any pixel values. The original file is not modified. The re-encoded result is returned to your browser and never saved on the server.

The default is 82%, which is a widely used baseline for photographic WebP images. At this level the encoder discards enough data to produce a noticeably smaller file while keeping visual differences below what most viewers notice. If the result still looks good and you need a smaller file, try 70-75%. For graphics where sharpness is critical, switch to lossless mode instead of lowering the quality slider.

Yes. The tool re-encodes the input as WebP and returns a WebP file. The format does not change. Transparency (alpha channel) is preserved in both lossy and lossless output, so if your original had a transparent background it will remain transparent after compression.

No. Images are processed entirely in memory. The server re-encodes the file and streams the result back to your browser without writing anything to disk. Once the response is sent, nothing from your upload remains on the server. No account or login is required, and no image data is linked to your identity.

Lossy WebP works by transforming pixel blocks into frequency coefficients and then quantizing those coefficients, which permanently removes some image data. The result is a smaller file where fine detail may be slightly softened. Lossless WebP uses spatial and color prediction to model pixel values, then entropy-codes the residuals. No pixel data is removed, so decompressing the file reproduces the original exactly. Lossy suits photographs; lossless suits graphics, logos, and images where pixel accuracy matters.

The general image compressor accepts multiple formats including JPG, PNG, GIF, AVIF, and WebP through the same interface. This page restricts the dropzone to WebP files only, which is useful when you want to focus on a single format without filtering a mixed batch. The underlying compression engine and all available controls are identical on both pages.

Each WebP file can be up to 40 MB. Multiple files are accepted in a single session, so you can drop a batch of images onto the dropzone at once. Each file is processed individually and the results are displayed together in the output panel with its own download button.

Maximum colors reduces the number of distinct colors in the image palette to the value you set (between 16 and 256). The encoder maps every pixel to the nearest color in the reduced palette. This can significantly shrink files that already use a limited color range, such as flat illustrations or pixel art. Images with smooth color gradients may show visible banding if the palette is reduced too aggressively, so test the result before using low values.

This can happen when the original was already compressed aggressively, or when lossless mode is applied to a file that was originally encoded with lossy compression. Re-encoding a lossy WebP in lossless mode forces the encoder to represent every pixel value precisely, including the artifacts introduced by the earlier lossy pass, which can increase file size. If this occurs, switch to lossy mode and adjust the quality slider instead.

The tool is designed for static WebP images. Uploading an animated WebP may produce unexpected results because the encoder treats the file as a single frame. If you are working with animated images, consider converting your content to a format with dedicated animation support and using the appropriate tool for that format.

Yes, the WebP compressor is free. No account, subscription, or login is required. You can upload files, adjust compression settings, and download results without any cost. There are no watermarks added to the output. The 40 MB per-file limit applies regardless of how many files you process.

WebP and AVIF both support lossy and lossless compression plus transparency. AVIF is based on the AV1 video codec and typically achieves smaller file sizes than WebP at equivalent visual quality, particularly for photographs. However, AVIF encoding is computationally heavier and browser support, while now broad, is slightly less universal than WebP. WebP remains a practical choice for broad compatibility. If you want to reduce AVIF images, SimpleSize also has an AVIF compressor .