Convert PNG to WebP
PNGs are big. WebP keeps the same image — transparency and all — at a fraction of the size. Convert here to make your site faster, with a quality slider you control.
PNG vs WebP: what changes
If your web pages are heavy and slow, oversized PNG files are often the reason. PNG is lossless, which is great for quality but terrible for download size — a single hero image can weigh several megabytes.
Re-encoding to WebP typically cuts that by 25–35% (and far more for photographic content) while keeping the alpha transparency PNG is loved for. Every major browser has supported WebP since 2020, so it’s safe to ship today. Use the quality slider to find the sweet spot between crispness and file size — and since it all runs locally, you can experiment freely without re-uploading anything.
How to convert PNG to WebP
- Open the converterOpen the FavGrab converter from the button above.
- Drop your PNGsAdd one image or a batch of PNGs to optimise.
- Choose WebP and tune qualitySelect WebP, then set the quality slider — around 80 is an excellent balance for web images.
- Convert & compareConvert and check the new size shown next to each file before downloading.
PNG vs WebP at a glance
PNG
- Compression
- Lossless — no quality loss
- Transparency
- Yes (full alpha channel)
- Compatibility
- Universal
- Best for
- Logos, screenshots, icons, line art, anything with transparency
WebP
- Compression
- Lossy or lossless — adjustable
- Transparency
- Yes (alpha channel)
- Compatibility
- Every modern browser since 2020
- Best for
- Fast-loading website images at small file sizes
When to convert PNG to WebP
- Speeding up a website by shrinking image payloads
- Improving Core Web Vitals / Lighthouse scores
- Serving smaller images without losing transparency
- Reducing storage and bandwidth costs for image-heavy sites
Why convert in your browser
Nothing is uploaded
Every byte is decoded and re-encoded on your own machine using Canvas and WebAssembly. Your images never touch a server, so there is no upload bar, no queue, and no copy of your file sitting in someone else’s bucket.
Works offline
After the first load the converter is cached. Open it on a plane, on hotel Wi-Fi, or with the cable unplugged and it still runs at your CPU’s full speed.
Frequently asked questions
How much smaller will my WebP be?
It depends on the image, but expect roughly 25–35% smaller than a PNG for graphics, and often much more for photographic content. The converter shows the resulting size for each file so you can verify before downloading.
Does WebP keep PNG transparency?
Yes. WebP supports a full alpha channel, so transparent PNGs convert to transparent WebP with no background added.
Is WebP safe to use on my website?
Yes — every current browser (Chrome, Edge, Firefox, Safari) has supported WebP for years. It’s a standard choice for production web images.
Lossy or lossless WebP?
The quality slider controls lossy WebP, which gives the biggest size savings. Set quality to 100 for a near-lossless result if you’d rather keep maximum fidelity.
Related converters
Make your images lighter
Convert PNG to WebP and watch the file size drop — all in your browser.
Open the converter →