Pixotter
Convert PNG to WebP
WebP offers 25-35% smaller file sizes than PNG with equivalent quality. Converting PNG to WebP is one of the easiest ways to speed up your website -- every major browser now supports it.
Why Convert PNG to WebP?
PNG is a reliable format — 100% browser support, lossless fidelity, full transparency. But it's also the heaviest format routinely used on the web. That 2MB product photo, that 800KB hero image, that 300KB icon set — they're almost certainly PNG files holding onto more bytes than they need to.
WebP changes the math significantly. Google developed WebP specifically to shrink web images without sacrificing what makes them usable. The results are hard to argue with: lossless WebP is 26% smaller than equivalent PNG. Lossy WebP — which covers most web images — runs 60-80% smaller.
The transparency advantage is the one that surprises people most. Unlike JPEG, WebP supports full alpha channels. That 2MB PNG with a transparent background? Convert it to lossless WebP and you're looking at roughly 1.4MB — same quality, same transparent background, immediately smaller. Go lossy and a typical photo drops to 400-600KB.
The SEO payoff is direct. Google's PageSpeed Insights, Lighthouse, and Core Web Vitals scoring all flag unoptimized PNGs. Serving WebP clears those warnings and shrinks Largest Contentful Paint times. For image-heavy pages, switching PNGs to WebP is often the single highest-ROI optimization available.
Browser support is effectively universal — 97%+ of users, including all modern versions of Chrome, Safari, Firefox, and Edge.
PNG vs WebP
| Feature | PNG | WebP |
|---|---|---|
| Lossless file size | Baseline | ~26% smaller |
| Lossy file size | N/A (quantization gives 50-80% reduction) | 60-80% smaller than PNG |
| Transparency (alpha channel) | Yes | Yes |
| Animation | APNG (limited browser support) | Yes (wide support) |
| Color depth | Up to 16-bit | 8-bit |
| Browser support | 100% | 97%+ |
| Non-browser support (editors, email) | Universal | Growing — gaps remain |
| Best for | Editing, printing, maximum compatibility | Web delivery, modern apps |
Quick read: For web delivery, WebP wins on file size with equivalent visual quality. For anything leaving the browser — email templates, design software hand-offs, print — PNG is still the safer choice. See PNG vs WebP: When Each Format Wins for a full breakdown, and Best Image Format for Web for the wider picture including AVIF.
Lossless vs Lossy: Which to Choose
When you convert PNG to WebP, you choose between two compression modes. The right one depends on the image.
Lossless PNG → Lossless WebP. Every pixel is preserved exactly. The result is 26% smaller with zero quality change. Right choice for logos, icons, UI screenshots, technical diagrams — anything with crisp edges, flat colors, or text where even subtle degradation is noticeable.
Lossless PNG → Lossy WebP. Color data is reduced to achieve 60-80% file size savings. Minor quality loss that's imperceptible in photos and complex graphics. Wrong choice for flat-color graphics with sharp edges; right choice for nearly everything else. Quality 80 (out of 100) is the standard starting point — it's the sweet spot where compression is aggressive and visual impact is negligible.
The practical rule: If it's a logo, icon, or UI element with crisp edges → lossless. If it's a photo, illustration, or complex background image → lossy at quality 80. In both cases, transparency is fully preserved.
Pixotter lets you choose. If you're not sure, start with lossy at quality 80 and compare the output.
When to Keep PNG Instead
WebP is better for web delivery. But PNG stays the right choice in specific situations:
- Further editing. Every major image editor (Photoshop, Affinity, GIMP) opens PNG natively. WebP support in editing software is improving but not universal.
- Email templates. A significant slice of email clients — particularly older Outlook versions — don't render WebP. PNG is the safe default.
- Legacy systems. Old CMS platforms, document generators, and print workflows often expect PNG or JPEG. Check your toolchain before converting assets you'll need to reuse.
- 16-bit color depth. WebP caps at 8-bit. Scientific imaging, medical imaging, and professional photography post-processing workflows that require 16-bit precision need PNG.
If the image lives on a web page and users will see it in a browser — convert to WebP. Everything else, evaluate case by case.
Tips for Best Results
- Resize before converting. Reducing an image from 4000px to 1200px wide before conversion compounds the savings — you're compressing fewer pixels.
- Use quality 80 as your default. For lossy WebP, quality 80 is the industry-standard starting point. Savings are aggressive; visible degradation is rare.
- Keep the PNG source file. Once you ship the WebP, archive the original. If you need to re-export or edit later, the PNG is your source of truth.
- Use `
` for bulletproof compatibility. For the 3% of browsers that don't support WebP, wrap your image in a `` element with a PNG fallback. Most modern CMS platforms (WordPress 5.8+, Shopify) handle this automatically. - Batch convert. Drop all your PNGs into Pixotter at once — it processes them in parallel. No queue, no per-file waiting.
- Run the full pipeline. If images also need compression or resizing, use Pixotter's pipeline to handle everything in one pass instead of re-exporting multiple times.
Frequently Asked Questions
Does converting PNG to WebP lose the transparent background?
No. WebP supports full alpha channels — the same transparency model as PNG. Transparent backgrounds, semi-transparent shadows, and anti-aliased edges all convert cleanly. The transparency is preserved in both lossless and lossy WebP modes.
This is one of the key reasons WebP replaced JPEG as the recommended web format for images with transparency. JPEG doesn't support alpha at all, so converting a PNG with transparency to JPEG fills the background with white (or another solid color). WebP has no such limitation.
How much smaller is WebP vs PNG?
Lossless WebP: approximately 26% smaller than equivalent PNG, pixel-for-pixel identical quality.
Lossy WebP: 60-80% smaller. A 1MB PNG typically becomes 200-400KB as lossy WebP at quality 80. A 2MB PNG typically lands between 400KB and 800KB.
The exact savings depend on the image. Photos with lots of color variation compress more aggressively than flat-color graphics. The 26% / 60-80% figures are averages across real-world images — your specific images may be higher or lower.
Should I use lossless or lossy WebP?
Use lossless for: logos, icons, UI elements, screenshots with text, flat-color graphics, any image where crisp edges and exact color accuracy matter.
Use lossy for: photographs, illustrations, product images, background images, hero images — anything with complex color gradients and fine detail where exact pixel accuracy isn't critical.
When in doubt: try lossy at quality 80 first. Download the output and compare it at 100% zoom. If you can see the difference, bump to quality 90. If you still can't justify the quality tradeoff, use lossless. For most web images, quality 80 is indistinguishable from the original at any normal viewing size.
Pixotter detects transparency automatically and preserves it regardless of which mode you choose.
Will all browsers display WebP images?
97%+ browser support as of 2026 — Chrome, Safari, Firefox, Edge, and Opera all support WebP. The browsers that don't are primarily legacy versions (Internet Explorer, very old mobile browsers) that represent a shrinking fraction of real traffic.
For the remaining ~3%, the standard solution is the `
```html 
Browsers that support WebP load the WebP. Browsers that don't fall back to the PNG. WordPress automatically generates WebP versions and serves them with appropriate fallbacks since version 5.8 — most major CMS platforms have equivalent support.
For a full comparison of next-gen format support, see WebP vs AVIF: Which Should You Use?
Can I convert animated PNG (APNG) to animated WebP?
Most general-purpose conversion tools — including Pixotter — convert static frames only. An APNG dropped into a PNG-to-WebP converter will typically produce a static WebP from the first frame.
For animated WebP, the practical approach is to work from source frames rather than converting from APNG. If you have the original frame sequence (from After Effects, GIMP, or any animation tool), export those frames as individual PNGs and assemble them as WebP animation using `img2webp` (Google's CLI tool):
``` img2webp -d 100 frame1.png frame2.png frame3.png -o animation.webp ```
Animated WebP has broader browser support than APNG and typically achieves smaller file sizes.
How do I batch convert PNG to WebP?
In the browser: Drop all your PNGs into Pixotter at once. The tool handles them in parallel — a batch of 30 files processes in the same time as a single file. No upload, no server, everything stays in your browser.
CLI (for automation or CI/CD): Google's `cwebp` tool converts individual files. For batch conversion:
```bash for f in *.png; do cwebp "$f" -o "${f%.png}.webp"; done ```
Or with quality control: ```bash for f in *.png; do cwebp -q 80 "$f" -o "${f%.png}.webp"; done ```
WordPress: Automatic since WordPress 5.8. WebP versions are generated on upload and served to supporting browsers. No plugin required for basic support; plugins like Imagify or ShortPixel give you more control over quality settings.
For bulk compression of existing PNG files before conversion, see How to Compress PNG Files — compressing first can sometimes reduce the source data before format conversion.
Is converting PNG to WebP reversible?
Yes, but with caveats. You can convert a WebP back to PNG — see Pixotter's Convert WebP to PNG tool. The round-trip is lossless for lossless WebP files (every pixel is intact). For lossy WebP, the quality loss is baked in — converting back to PNG produces a PNG of the WebP's quality, not the original PNG's quality.
This is why keeping your original PNG source files matters. The WebP is your web delivery format. The PNG is your editing and archival format. Don't delete the original unless you're certain you'll never need to re-export or edit the image.
How It Works
Drag and drop your .png image onto the page, or click to browse your files.
The tool converts your image to WebP format instantly in your browser. No upload, no waiting.
Click download to save your new .webp file. The original image is unchanged.