Solution
Convert images to WebP without uploading them
WebP is the de-facto standard for web images. Converting to it typically reduces file size by 25–35% compared to JPEG, improving page speed and Core Web Vitals without loss of quality.
ConV converts to WebP entirely in your browser using libwebp compiled to WebAssembly. Nothing is uploaded — not filenames, not pixels.
Batch convert entire image directories, export as ZIP, and upload directly to your CMS — no intermediate cloud step required.
Key benefits
- Converts JPEG, PNG, AVIF to WebP locally
- libwebp WASM — same codec quality as popular cloud converters
- Batch mode: convert dozens of files in one session
- ZIP export for fast CMS or FTP upload
- EXIF metadata removed during conversion
Common use cases
- Web developers preparing WebP assets for production
- Shopify and WooCommerce teams preparing product images
- Agencies converting client image sets under confidentiality agreements
- Performance engineers reducing image payload for Core Web Vitals
How it works
- 01
Drop JPEG, PNG, or AVIF files
- 02
Select WebP as output format; set quality (0–100)
- 03
Workers convert in parallel — results appear as they complete
- 04
Download as ZIP or save individual files
Limitations and realistic expectations
Animated WebP from video or GIF sources is not supported. Very high-resolution source images may be slower on low-spec hardware.
Frequently asked questions
Is WebP conversion lossless or lossy?
Both modes are available. Lossy is typical for photos; near-lossless (quality 90–100) works well for graphics and illustrations.
Can I convert WebP back to JPEG?
Yes. ConV supports WebP as both input and output. Convert WebP → JPEG by selecting JPEG as your output format.
How much does WebP reduce file size?
Typically 25–35% vs JPEG and 25–50% vs PNG at equivalent visual quality, though results vary by source image content.
Are my files uploaded to a WebP conversion API?
No. ConV converts locally in your browser. No files are sent to any server.
Related solutions
Convert images to AVIF locally in your browser
AVIF is the next-generation image format backed by the Alliance for Open Media. It achieves 30–50% better compression than JPEG at comparable visual quality and often outperforms WebP.
Compress multiple images locally and export them as ZIP
Processing images one at a time is impractical for agencies, content teams, and e-commerce workflows. ConV's batch mode handles dozens of images in a single session with parallel encoding and ZIP export.
Optimize images for Core Web Vitals without cloud uploads
Images are the largest contributor to Largest Contentful Paint (LCP) — the most impactful Core Web Vitals metric. Reducing image file size and using modern formats (WebP, AVIF) is the most effective single optimization for most pages.