WebP Converter. · macOS · Blazing fast · 100% offline
Effortless
WebP Converter. is a free macOS app that bulk-converts PNG, JPG, HEIC, and GIF to WebP — entirely on your Mac. Convert, resize, optimize, and watermark whole folders in a single pass. No uploads, no waiting.
Drop a folder
or images. Done.
Bulk in, bulk out
Instant
WebP Conversion
PNG · JPG · HEIC · GIF → WebP
100% on your Mac
No upload · No account
Fast, native, secure
Apple Silicon-optimized
Free to download
macOS 12+ · Apple Silicon native · 100% local processing
Three steps, done
Batch converting PNG, JPG, HEIC, and GIF to WebP on a Mac takes three steps: drop your images, pick a quality, and hit Start.
Drop your images
Drag PNG, JPG, GIF, and more from Finder. A whole folder works too.
Pick quality
Lossy (e.g. quality 80) or lossless. Save your settings as a preset for next time.
Hit Start
Hundreds of images finish in seconds on Apple Silicon. Nothing is uploaded anywhere.
The User Guide walks through every setting and handy workflow, with screenshots.
Feature highlights
Beyond WebP conversion, WebP Converter. handles resizing, metadata control, before/after comparison preview, and batch watermarking — all in a single window.
ENCODE · RESIZE · STRIP · OUTPUT
Every control you need. Tuned to
WebP at the core, with PNG and JPG also available as outputs. Get fine-grained control over quality, dimensions, color profile, and metadata, per file.
Before/after file size and compression ratio are shown in the UI, so you can see exactly how much lighter the output gets, while you tune.
Encode
- WebP75
- JPG75
- PNG—
Resize
Max 1920pxStrip metadata
EXIF · GPS · camera- GPS35°41'22"N · 139°41'30"E
- CameraCanon EOS R5 · RF 50mm F1.2 L
- Date taken2024:08:14 18:22:07
- ICC profileDisplay P3 · kept
Output
4032 × 3024SIDE-BY-SIDE · PIXEL LEVEL
Slide and compare.
Drag the divider to compare original vs encoded output, frame-perfect. Decide on quality before you commit.
"Bump quality a bit." "Actually we can compress harder than I thought." Those calls become eye-level decisions, not number guesses.
POSITION · SIZE · OPACITY · OFFSET
Watermarks,
Drop a logo, set a position, dial in opacity and size. Applied to every image in the batch — automatically.
Works on still and animated WebP alike. Brand your blog images, your SNS feed, your e-commerce gallery — all in one pass.
Watermark Settings
Enabled
Free to download
macOS 12+ · Apple Silicon native · 100% local processing
How it compares
Unlike online converters, WebP Converter. completes the entire batch conversion on your Mac — images never leave your machine. And unlike cwebp, everything happens in a GUI: no shell scripting required.
| What you need | WebP Converter. | Online converter | cwebp (CLI) | Photoshop / Pixelmator |
|---|---|---|---|---|
| Images stay local | ✅ 100% local | ❌ Server upload | ✅ | ✅ |
| Batch processing | ✅ Hundreds at once | △ Daily limits | △ Shell scripting | △ Action / script needed |
| GUI workflow | ✅ | ✅ | ❌ Command line | ✅ |
| EXIF preservation, watermark | ✅ | △ | △ Combine with extra tool | △ Manual steps |
| Animated GIF → animated WebP | ✅ | △ | ✅ | ❌ |
| Price | Free + IAP | Free / metered | Free | Subscription |
WebP format comparison
WebP is an image format that is about 25–35% smaller than JPEG at equivalent quality and about 26% smaller than PNG for lossless compression, while supporting transparency and animation in a single format. Every major browser displays it today, which makes it the safest first step when replacing the images on a website.
| Capability | JPEG | PNG | GIF | WebP |
|---|---|---|---|---|
| Lossy compression | Yes (baseline) | No | No | Yes (~25–35% smaller than JPEG) |
| Lossless compression | No | Yes (baseline) | 256 colors only | Yes (~26% smaller than PNG) |
| Transparency (alpha) | No | Yes | 1-bit only | Yes (even with lossy) |
| Animation | No | APNG only | Yes (256 colors) | Yes (full color) |
| Browser support | All | All | All | All major browsers |
Compression figures are guideline values from Google's WebP comparison studies and vary with image content. WebP is supported in Chrome, Firefox, Edge, and Safari (macOS 11 / iOS 14 and later). If you need HDR or 10-bit-plus color depth, take a look at AVIF Converter.
Pricing
WebP Converter. is free to download, and the core feature — batch conversion to WebP — stays free. Only the extended features are in-app purchases.
| Plan | What's included |
|---|---|
| Free | Bulk conversion to WebP, drag & drop, quality control, lossy/lossless toggle. Everyday use is fully free. |
| In-app purchase / subscription | EXIF preservation, watermarks, additional PNG/JPEG output, saved presets. See the App Store for current pricing. |
Supported formats
WebP Converter. reads 19 image formats, including HEIC, PNG, JPG, GIF, TIFF, and PSD, and converts them to WebP.
| Direction | Formats |
|---|---|
| Read | HEIC, PNG, APNG, JPG, GIF, TIFF, DNG, EPS, PSD, JP2, J2K, JPC, BMP, JBIG, BIE, PNM, PGM, PBM, MAG |
| Write | WebP (primary). PNG / JPEG (in-app purchase). |
Who is it for
- Bloggers — boost Lighthouse scores by WebP-ifying past article images.
- Web developers / front-end engineers — ship optimized images alongside client deliverables.
- E-commerce operators — cut transfer costs and speed up product pages.
- Photographers / illustrators — make portfolio sites lighter.
- Marketing & comms — convert internal images without ever uploading them online.
Free to download
macOS 12+ · Apple Silicon native · 100% local processing
Why local processing
Images often carry EXIF data: capture time, GPS coordinates, camera model. With an online converter, that information is sent to a third party's server along with the image itself. WebP Converter. runs inside the macOS App Sandbox, and every conversion completes entirely on your Mac. Because images are never sent off your machine, you can convert unreleased product photos, assets entrusted to you by clients, and internal documents as they are. It works offline, too.
FAQ
QHow do I batch convert PNG or JPG to WebP on a Mac?
QAre my images uploaded anywhere?
QCan it convert HEIC photos from an iPhone?
QDoes WordPress support WebP out of the box?
QLossy or lossless?
QCan it convert animated GIFs?
QHow is it different from Image Tool+?
QSystem requirements?
Related guides
These guides compare the conversion methods (including the command line and online services) and explain how to choose a format.
- How to batch convert PNG and JPG to WebP on a Mac
- WebP vs AVIF: which image format should you use?
- How to batch convert images to AVIF on a Mac
Support
The WebP Converter. User Guide covers everything in detail, with screenshots: WebP settings and defaults, turning WebP back into PNG or JPG, batch renaming, watermarks, presets, and keyboard shortcuts.
If you get stuck, find a bug, or want a new feature, send a note via the contact form below.Every message is read by the developer and feedback shapes the next update.
The app is free to start, so try it without commitment. If anything comes up, the developer is one click away.
Download
WebP Converter. is free to start. Add the features you need via in-app purchase or subscription.
Free to download
macOS 12+ · Apple Silicon native · 100% local processing
Want to go even further? Try AVIF Converter.Or pick up the all-in-one Image Tool+.