PNG to WebP Batch Converter
Convert multiple PNG files to WebP in your browser. Alpha-channel transparency fully preserved, lossy or lossless mode, ZIP download — no upload, no signup.
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Download .webpHow to use
- 1. Drop one or more PNG (or JPEG/WebP) files onto the upload zone, or tap to browse your device.
- 2. Choose Lossy (smaller files, adjustable quality) or Lossless (pixel-perfect, no quality loss).
- 3. For lossy, set the quality slider — 85 gives the best balance of size and clarity for most images.
- 4. Click Convert all to WebP to process every file at once.
- 5. Download individual .webp files, or click Download ZIP for all results in one archive.
Why convert PNG to WebP?
WebP was developed by Google specifically as a replacement for PNG and JPEG on the web. It achieves smaller file sizes than PNG for the same visual quality — typically 25–35% smaller in lossy mode, and 10–20% smaller in lossless mode. All modern browsers support WebP: Chrome, Firefox, Safari 14+, and Edge all render WebP natively.
The key advantage of WebP over JPEG (when replacing PNG) is that WebP supports full transparency. PNG images with alpha channels — icons, logos, UI elements, product cutouts — can be converted to WebP and retain their transparent backgrounds. JPEG cannot store transparency at all, making WebP the only practical replacement for transparent PNGs on the web.
Lossy vs lossless WebP
Lossy WebP (recommended for photos and complex images): Uses predictive coding to reduce file size significantly. At quality 85, the output is visually indistinguishable from the source in most cases, and the file is 25–40% smaller than an equivalent PNG. Transparent pixels are still preserved — only opaque colour data is compressed with loss.
Lossless WebP (recommended for icons, logos, text, and UI graphics): The output is bit-for-bit identical to the source image. No compression artifacts, no colour shift. Lossless WebP is still typically 10–20% smaller than an equivalent PNG file.
Frequently Asked Questions
- Does transparency (alpha channel) survive the conversion?
- Yes. WebP supports full alpha-channel transparency, just like PNG. The canvas.toBlob() conversion used here preserves every transparent pixel in your source PNG — the output WebP retains the same transparency mask. No white fill, no black fill.
- Does this tool upload my files to a server?
- No. Every operation runs entirely inside your browser tab using the Canvas API. Your images are decoded and re-encoded on your own device — nothing is ever sent to a server, stored in the cloud, or accessible to anyone else.
- What is the difference between lossy and lossless mode?
- Lossy mode uses a quality slider (1–100). At quality 85, WebP files are typically 25–40% smaller than the equivalent PNG with imperceptible quality difference. Lossless mode produces a WebP that is pixel-for-pixel identical to the source PNG — useful for icons, logos, and UI graphics that must not have compression artifacts. Lossless WebP files are often still 10–20% smaller than equivalent PNGs.
- Does it work on mobile?
- Yes. Works in any modern browser on iPhone (Safari 14+), Android Chrome, Mac, Windows, and Linux. Tap the upload zone to open your photo library. The ZIP download requires a browser that supports the download attribute — all modern mobile browsers do.
- How many files can I convert at once?
- There is no hard file count limit. Files are processed one at a time in your browser. For large batches (100+ files), allow extra time — each image must be decoded, drawn to a canvas, and re-encoded as WebP.
- Can I convert JPEG and WebP files too, not just PNG?
- Yes. The tool accepts PNG, JPEG, WebP, and most other common image formats. However, JPEG and non-transparent WebP files do not have an alpha channel, so selecting lossless mode for those files will produce a WebP with no benefit over a standard PNG. Use lossy mode for photos.
Last updated: By jarvisbox