Bulk PNG to WebP Converter
Convert and compress hundreds of PNG images to WebP format instantly. Right inside your browser. No file uploads, no signups, no limits.
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No account, no install, no queue. Drop your PNG files in and the WebP versions are ready to download.
- Step 1
Drop your images in
Drag files onto the page, click to browse, or drop in a ZIP and every supported image inside is pulled out. JPG, PNG, WebP, AVIF, HEIC, GIF and BMP all work, mixed together in the same batch.
- Step 2
Adjust if you want to
Choose your output format and drag the quality slider. That is the whole setup. Settings holds a KB target, resizing and batch renaming if you want them, and can stay closed if you do not.
- Step 3
Download your WebP files
Conversion starts on its own, so there is usually nothing to press. Batches over 40 wait for one click so nothing runs away with your machine. Download files one at a time or take the whole batch as a single ZIP.
Why Convert PNG to WebP?
PNG is the standard when you need transparency and lossless detail. Screenshots, logos, UI assets, product images with transparent backgrounds. The trade-off is file size. A single PNG can easily weigh 2-5 MB, and when you have dozens on a page, the performance cost adds up fast. WebP, developed by Google, delivers the same visual fidelity at 25-35% smaller file sizes, supports transparency, and is natively recognized by every modern browser including Chrome, Firefox, Safari, Edge, and Opera.
Portable Network Graphics
PNG uses lossless compression. What you save is exactly what you get, with zero quality degradation. It's the default for screenshots, interface elements, logos, icons, and any graphic where sharp edges and transparency matter. The downside is that lossless compression produces significantly larger files than lossy alternatives.
WebP Image Format
WebP supports both lossy and lossless compression, alpha transparency, and animation. All in one format. A typical PNG converted to WebP at quality 80-90 shrinks by 25-35% with no perceptible visual difference. Google recommends WebP for web performance, and it's the format behind faster Largest Contentful Paint scores and better Core Web Vitals.
Everything You Need. Nothing You Don't.
Most online PNG to WebP converters give you a file picker and a download button. SmallerImages gives you the full toolkit. All free, all in your browser.
True Bulk Conversion
Convert 10 images or 500+ in a single batch. No per-file limits, no daily caps, no throttling.
100% Private & Secure
Every conversion runs locally using client-side JavaScript. Nothing is uploaded. Your data stays on your device.
Adjustable Quality Control
Set compression from 1-100. The before/after slider lets you verify quality visually on each image.
ZIP Upload & Download
Upload a ZIP with hundreds of images. Extracted instantly. Download all converted files as a single ZIP.
Batch File Renaming
Custom prefix, separator, numbering, and extension. Preview before download. Single files skip the number.
HEIC & AVIF Support
Upload iPhone HEIC or AVIF files directly. Try our HEIC to WebP or AVIF to WebP converters.
the maximum size option
Set a KB target. The tool uses binary search compression to hit it while maintaining maximum quality.
Works on Every Device
Windows, Mac, Linux, Chromebook, iPhone, Android. Any modern browser runs this tool.
Selective Processing
Upload 50 images, select only 12. Only those 12 get processed. Full control over what converts.
How SmallerImages Compares
Here's how our free PNG to WebP converter stacks up against the typical tool online.
| Feature | SmallerImages | Typical Converter |
|---|---|---|
| Bulk conversion (200+ files) | Yes | No 10-20 file limit |
| Browser-based (no server uploads) | Yes | No Files uploaded to server |
| ZIP file upload & download | Yes | No |
| HEIC (iPhone) input support | Yes | No |
| AVIF input & output | Yes | No |
| Adjustable quality (1-100) | Yes | Limited presets |
| Target file size (KB control) | Yes | No |
| Batch file renaming | Yes | No |
| Selective processing | Yes | No All or nothing |
| Before/after comparison slider | Yes | No |
| 100% free. No signup, no limits | Yes | Freemium / ads |
| Ad-free experience | Yes | No |
When You Need PNG to WebP
Whether you're a developer optimizing Core Web Vitals, a designer preparing assets, or an e-commerce manager uploading product images. Converting PNG to WebP saves real time and bandwidth.
Website & Page Speed Optimization
Google's PageSpeed Insights flags PNG images as opportunities to "serve in next-gen formats." Converting to WebP reduces LCP, improves Core Web Vitals, and lifts search rankings.
WordPress, Shopify & CMS Uploads
Convert product images, blog graphics, and thumbnails before uploading to cut storage costs and speed up every page. No WordPress plugin needed.
Email & Newsletter Graphics
Smaller images mean faster emails. Convert banners from PNG to WebP, and use our PNG to JPEG converter for clients needing JPG fallbacks.
Developer & Build Pipelines
Drop your asset directory as a ZIP, convert in one batch, download as a renamed ZIP. Ready to deploy. No npm packages or CLI tools needed.
Social Media & Ad Creatives
Facebook, Instagram, LinkedIn all accept WebP now. Smaller files upload faster and display instantly.
E-commerce Product Images
A 1-second delay reduces conversions by 7%. Convert product photos in bulk to WebP to keep pages fast and conversion rates high.
Trusted for PNG to WebP Conversion
Real feedback from people converting PNG to WebP every week, from teams in the UK, US, India, Japan, Pakistan, the UAE and beyond.
What surprised me was that it stays responsive during a big batch. The page does not lock up, the progress updates, and I can keep working in another tab.
Being able to upload a ZIP and download a ZIP is what makes this usable for real work. I am not selecting 200 PNG files by hand and I am definitely not downloading 200 WebP files one at a time.
Clear error messages when something is wrong. I had a file that was a renamed PNG and it told me the contents did not match the extension rather than just failing silently.
Our product pages were loading slowly on mobile and it was almost entirely image weight. Converting the PNG catalogue to WebP cut the total page size by more than half.
Tried the usual suspects including Photoshop. The difference here is no file cap and no watermark on the free tier, because there is no paid tier to upsell you to.
The thing that sold me is that there is no upload. I opened devtools, converted twenty PNG files to WebP, and watched the network panel stay empty. That is a real privacy claim, not marketing copy.
PNG is great for lossless detail and transparency, but enormous file sizes is a real problem once you have a few hundred of them. Converting to WebP fixed that without me having to think about codecs.
Used it on Windows at the office and on a Mac at home with identical results. No install, no licence, nothing to sync.
The batch handling is the reason I keep this bookmarked. 150 PNG images to WebP in one pass, with a progress bar that actually tells you which file it is on. Most converters choke well before that.
The comparison slider is what earned my trust. Being able to drag across the actual image and check the WebP output against the original PNG before downloading is not something the other free tools bother with.
Added some files mid-batch and the button changed to say it would only process the new ones. Little detail, but it means I am not reconverting work that is already done.
What surprised me was that it stays responsive during a big batch. The page does not lock up, the progress updates, and I can keep working in another tab.
PNG to WebP Conversion and Compression Explained
What changes when you convert PNG to WebP, what it costs, and how to pick a quality setting you will not regret.
PNG earns its place wherever an image has hard edges or a transparent background. It is lossless, so what you save is exactly what you get. The cost is size: a single full-page screenshot regularly lands between 1.5 MB and 6 MB, and a page carrying twenty of them is a slow page. Converting to WebP keeps the image looking the same while removing most of that weight.
Going from a lossless format to WebP means the encoder is deciding what to discard. At quality 80 to 90 that decision is invisible on photographs and near-invisible on interface screenshots. Below about 65 you start to see it around text and sharp edges, which is why the before and after slider is worth using on the first file of any batch.
Set quality once and it applies to the whole batch, so a folder of two hundred files takes the same number of decisions as one. Everything runs on your own machine, so speed depends on your processor rather than on how busy a server is. If you are working to a hard limit, such as a content management system that rejects anything over 200 KB, open Settings and set a maximum file size instead of a quality percentage. The encoder then searches for the best quality that fits your budget, file by file.
All Formats. One Tool.
PNG to WebP is one of twenty-four conversion paths here, and each one has its own page with defaults already set for that pair. Whichever you land on, the tool behind it is the same: it accepts JPG, PNG, WebP, AVIF, HEIC, GIF and BMP, reads ZIP archives, and handles up to 500 images in a single batch.
Conversion runs in your browser using your own processor, so nothing is uploaded, nothing is queued behind other people, and there is no account, no watermark and no daily cap. Close the tab and the files are gone from memory; they were never anywhere else.
If you need a smaller file rather than a different format, the image compressor keeps your originals and works to a quality level or a size in kilobytes. To change dimensions, the image resizer handles fit, fill and crop, or stretch across a whole folder at once.
Frequently Asked Questions
Quick answers about converting PNG to WebP.
Is it safe to convert PNG to WebP on SmallerImages?
How many PNG files can I convert to WebP at once?
Does converting PNG to WebP reduce image quality?
Can I convert HEIC (iPhone) photos to WebP?
Do I need to install any software?
What is WebP and why should I use it?
Can I set a target file size?
Is SmallerImages completely free?
Can I upload a ZIP file?
What if I need WebP back to PNG?
Stop Uploading Your Images to Strangers
Every other converter uploads your files to their servers. SmallerImages keeps them on your device. Convert PNGs to WebP in seconds, for free, with zero compromises.
Convert PNG to WebP Now