Compress WebP
Process images in your browser — your files never leave your device.
What is the Compress WebP?
This tool compresses WebP files using your browser's lossy VP8-based encoder — the quality slider (10–100%) controls the same block-prediction and transform-based compression that made WebP images roughly 25–35% smaller than equivalent-quality JPEGs when Google introduced the format. Drop in one or more .webp files, set a quality, and download smaller versions with the pixel dimensions unchanged. This is the lossy path specifically; the widget does not expose a separate lossless-mode toggle, so if your source WebP was already saved lossless you'll get the smallest results by lowering the quality slider from 100.
WebP is a hybrid format: it can be encoded lossy (like JPEG, but with a more modern predictor) or lossless (like PNG, but with a better compressor). This tool works on the lossy side, which is what almost everyone means by "compress webp" — shrinking an already-webp file further, or bringing a large lossless WebP down with a quality setting.
Why use a free compress webp?
Smaller than JPEG at equal visual quality
WebP's lossy encoder generally beats JPEG's DCT approach by 25–35% at a comparable quality level, largely from better block prediction and an in-loop deblocking filter.
Keeps transparency
Unlike JPEG, WebP supports an alpha channel. Compressing a transparent WebP here keeps that transparency intact — nothing gets flattened to a solid background.
Same three controls as every compressor on this site
Quality, max dimension and target size in MB — consistent with Compress JPEG and Compress PNG, so switching between formats does not mean relearning a UI.
Batch and ZIP
Compress a folder of WebP images in one pass and download the results as a single ZIP instead of one file at a time.
Local processing only
Compression runs in your browser via the Canvas API. Your original files are never uploaded, which matters for pre-launch product images or unpublished site assets.
How do you use the Compress WebP?
- 1
Add your WebP files
Drag and drop one or more .webp files, or click to browse.
- 2
Set the quality slider
Lower values shrink the file more aggressively at the cost of fine detail. 75–85 is a reasonable starting point for photos; graphics with flat colour tolerate lower values well.
- 3
Optionally cap dimension or set a target size
Max dimension resizes before compressing. Target size works backward from a size in MB, useful when you have a hard upload limit.
- 4
Compress and review
Click Compress. Check a couple of results at full size before downloading everything — WebP artefacts at low quality show up as smoothing in fine texture rather than the harsh blocking JPEG produces.
- 5
Download
Download individually, or as a ZIP once more than one file has finished.
How is compress webp calculated?
Reduction % = (original size − compressed size) ÷ original size × 100Where:
- original size
- Size of the source WebP in bytes
- compressed size
- Size after re-encoding at the chosen quality
- quality (10–100)
- Controls the lossy VP8 encoder's quantization — lower values discard more residual detail after block prediction
The simple version
WebP's lossy mode predicts each block of pixels from its neighbours, then only stores the difference between the prediction and the real pixels. The quality setting controls how precisely that difference gets stored — high quality keeps the difference almost exact, low quality rounds it off more, which is what shrinks the file and softens fine detail.
What does it look like in practice?
Product photo, standard quality
Input
1.1 MB WebP, 2400×1600, quality 80
Result
~260 KB, no visible change at normal size
A typical result for a photo with natural texture — WebP at 80 usually looks equivalent to JPEG at 85–90 while ending up smaller.
Transparent graphic
Input
640 KB WebP icon with alpha channel, quality 90
Result
~180 KB, transparency preserved
Flat-colour graphics with sharp edges compress well even at high quality, and the alpha channel comes through unchanged.
Aggressive compression
Input
Same 1.1 MB product photo, quality 35
Result
~85 KB, with visible softening in fine texture like fabric weave
WebP degrades more gracefully than JPEG at low quality — you see smoothing rather than hard blocking — but detail loss is still visible below roughly quality 40–45.
How accurate is it?
Compression runs through the browser's native WebP encoder via Canvas toBlob, the same encoder Chrome and Edge use for any WebP export. The size shown after compression is the exact size of the downloadable file, not an estimate.
- This tool applies lossy compression only. If you need true lossless WebP output — every pixel identical, just DEFLATE-style compressed — this UI does not expose that mode; a quality setting near 95–100 gets close but is not bit-exact.
- Compression results depend on image content — photos with fine, repeating texture (hair, fabric, foliage) compress less than smooth gradients or flat graphics at the same quality.
- Target size mode converges close to your target but is not guaranteed exact to the byte, since it depends on how the specific image responds to quality and dimension changes.
- Not every application or CMS accepts WebP uploads. Check your destination platform before relying on it for critical assets.
What should you know before using it?
WebP compared with JPEG and PNG:
| Format | Compression mechanism |
|---|---|
| WebP | Lossy VP8-based or lossless mode, adjustable quality, full alpha support. Typically smallest at a given visual quality. Not accepted by every legacy tool. |
| JPEG | Lossy DCT only, adjustable quality, no transparency. Universally supported. See Compress JPEG. |
| PNG | Lossless DEFLATE only, full alpha support, no quality slider that does much. See Compress PNG. |
Which tools relate to the compress webp?
The compress webp is one of 31 image tools on this site. These are the ones most often used alongside it — either because they handle the next step in the same job, or because they answer a question this tool raises.
Compress JPEG
The universally compatible alternative — use it when a destination cannot accept WebP, accepting a larger file at the same visual quality.
WebP to JPG
Convert instead of compress when the goal is compatibility with software or platforms that cannot open WebP at all, rather than a smaller file.
PNG to WebP
Converting a lossless PNG to WebP's lossless mode usually shrinks it further than any PNG-only re-encoding can, while staying pixel-exact.
Image Resizer
Combine a dimension cap with compression for the smallest possible file — resizing removes pixels, compression removes redundancy in what remains.
When should you use a compress webp?
Because the compress webp runs entirely in your browser, it suits work you would not want to hand to a third-party server — client files, unpublished drafts, anything under an NDA. These are the situations people reach for it in most often.
Modern website images
Every major browser now supports WebP. Serving compressed WebP instead of JPEG for hero images and product photos cuts page weight and improves load-time metrics directly.
App and PWA asset bundles
Smaller image assets mean a smaller install or cache size for progressive web apps and hybrid mobile apps that bundle their own images.
CDN and bandwidth cost reduction
At scale, serving 25–35% smaller images than JPEG equivalents adds up to a meaningful bandwidth and CDN cost saving for high-traffic sites.
Combining with other image edits
Crop or resize an image first, then compress it here as a final step to get the smallest usable WebP for its intended placement.
Open the Combining with other image editsFrequently asked questions
How much smaller is a compressed WebP than a JPEG?
Does this tool support lossless WebP compression?
Will compressing a WebP remove its transparency?
What quality setting should I use for WebP?
Can every browser and platform open a compressed WebP?
Is my WebP file uploaded anywhere when I compress it?
Is the compress webp safe to use?
This tool runs entirely inside your browser. Your text, files and settings are processed on your own device and are never uploaded to our servers — there is nothing for us to store, log or leak. You can confirm it yourself: open your browser DevTools, switch to the Network tab, and use the tool. You will not see an upload request. It also means the tool keeps working if your connection drops mid-task.
Where do these figures come from?
Every method, threshold and standard this page relies on, with a link to the document that defines it. Check them — a tool that will not show its sources is asking you to take its word for it.
- 1WebP Compression Study
Google Developers
Supports: The claim that WebP's lossy encoder produces files roughly 25–35% smaller than JPEG at equivalent visual quality.
- 2Lossless and Transparency Encoding in WebP
Google Developers
Supports: The description of WebP's lossless mode and its full alpha-channel support.
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