WebP Compressor
Compress WebP images directly in your browser to reduce file size. Adjust quality settings while preserving transparency and color data with zero uploads.
JPG, PNG, WebP · up to 50 files
Quality
Longest side
Format
Tips
- WebP uses efficient compression, so setting quality below 0.8 often introduces visible visual artifacts.
- Transparent WebP graphics encode alpha channels separately, yielding smaller size reductions than opaque photos.
- Setting a maximum dimension boundary like 1600 pixels reduces file weight faster than lowering quality alone.
How to use it
- 1 Select or drag and drop your WebP images into the compression area.
- 2 Adjust the compression quality slider and define optional maximum pixel dimensions.
- 3 Preview the estimated file reduction and save the optimized WebP files to your device.
What you should know
Modern web workflows rely heavily on WebP because it combines 24-bit color depth, 8-bit alpha transparency, and advanced prediction filters to deliver significantly smaller payloads than legacy JPEG or PNG files. However, high-resolution WebP photographs or unoptimized assets still consume bandwidth and hurt Core Web Vitals scores. Adjusting the lossy compression quality level quantizes high-frequency visual data, such as subtle textures and background noise, drastically reducing byte size without perceptible distortion at moderate values. Since all major desktop and mobile browsers natively decode WebP, optimizing these files ensures rapid page rendering across all user devices.
This compressor runs entirely within your browser client via standard web encoding interfaces, meaning original files never leave your device. You can adjust the output quality factor and set maximum pixel dimensions to re-encode single or multiple WebP files on the fly. The recompression preserves transparent backgrounds and standard sRGB color spaces while stripping non-essential EXIF metadata and color profiles to maximize byte savings. Animated WebP sequences and multi-layer source data are flattened into standard single-frame compressed images during this process, ensuring lightweight delivery tailored for fast-loading web applications and responsive product catalogs.
Measured output sizes
Test file: a 2000×1500 photo saved as a 490 KB WebP, the kind of file a site already serves. Run in Chrome 154 on a desktop PC; each pass took between 0.13 and 0.29 seconds.
| Longest side | Quality | Output | WebP size | Change |
|---|---|---|---|---|
| Keep original | 0.85 | 2000×1500 | 519 KB | +6% |
| Keep original | 0.75 | 2000×1500 | 409 KB | −17% |
| Keep original | 0.60 | 2000×1500 | 350 KB | −29% |
| 1600 px | 0.85 | 1600×1200 | 334 KB | −32% |
| 1600 px | 0.75 | 1600×1200 | 230 KB | −53% |
| 1600 px | 0.60 | 1600×1200 | 194 KB | −60% |
| 1200 px | 0.85 | 1200×900 | 216 KB | −56% |
| 1200 px | 0.75 | 1200×900 | 148 KB | −70% |
| 1200 px | 0.60 | 1200×900 | 126 KB | −74% |
- Re-encoding at quality 0.85 without a resize produced 519 KB, larger than the 490 KB source. The tool checks for this and hands your original back untouched, so a wasted run costs you nothing but the wait.
- Without a resize, quality is the only dial: 409 KB at the default 0.75 and 350 KB at 0.60, so 17% and 29% off.
- The longest-side chip does the real work. 1600 px at 0.75 gave 230 KB, a 53% cut, where quality alone stopped at 409 KB.
- Both together go furthest: 1200 px at 0.60 landed at 126 KB, about a quarter of the file you started with.
Frequently asked questions
Will compressing a WebP image remove its transparent background?
No, transparent pixels are preserved during compression because the alpha channel is retained during re-encoding.
What quality value provides the best balance between size and visual clarity?
A quality setting between 0.75 and 0.85 typically yields significant size savings without introducing noticeable compression artifacts or banding.
Are my WebP files uploaded to an external server during compression?
No, all processing occurs locally in your web browser using client-side decoding and re-encoding routines.
Guides
Articles and format references related to this tool.
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