Best PNG to WebP Converter (2026): 10 Tools Ranked

Converting .png graphics to WebP is one of the easiest ways to make a site lighter without losing quality — or transparency. Google reports that WebP lossless images are 26% smaller than PNGs (Google for Developers), and because WebP supports a full alpha channel, logos, icons, and screenshots keep their transparent backgrounds. The right tool depends on the job: cleaning up one hero graphic, batch-converting an icon set, or wiring conversion into a build.

Quick answer: For the highest-fidelity, scriptable output, the benchmark is cwebp, Google's own free command-line encoder. For most people who don't want a terminal, the best pick is Pixelor, a free browser converter that runs on your device so nothing is uploaded — and it preserves PNG transparency. Below we rank 10 options, each scored and verified against its official site in 2026.

Disclosure: Pixelor publishes this list and is one of the tools featured in it. We rank on a transparent, weighted scoring system and say plainly where a competitor beats us — that's the only way a roundup earns your trust.

Key Takeaways

• Benchmark quality: cwebp — Google's official CLI, free, scriptable, the reference WebP encoder, with true lossless + alpha.
• Best for most people (free + private): Pixelor — converts in-browser, nothing uploaded, keeps transparency, no install.
• Best single-image tuning: Squoosh — Google's client-side app with a live before/after slider.
• Best free desktop batch: XnConvert — convert whole folders on Windows, Mac, and Linux.
• Best compression-first: TinyPNG and ShortPixel — aggressive savings plus WebP output and APIs.

How we evaluated & scored these tools

Every converter is scored on five weighted criteria, each out of 10, rolled into a weighted overall score out of 10:

Overall = 0.30·Quality + 0.20·Batch + 0.20·Privacy + 0.15·Ease + 0.15·Price. Every entry was checked against the tool's official site in 2026. Prices and limits change — confirm on the vendor's page before you rely on them.

Comparison table: 10 best PNG to WebP converters

*XnConvert is free for private and educational use; commercial use requires a license (from around €15, as of 30 Jul 2026).

1. cwebp (Google) — best for quality and automation

Best for: developers who want the highest-fidelity WebP and scriptable conversion. cwebp is Google's official command-line encoder, part of the libwebp toolkit, accepting PNG, JPEG, and TIFF input on Windows, macOS, and Linux (Google for Developers). As the format's reference implementation, its output is the benchmark others are measured against — and -lossless preserves PNG transparency and detail exactly.

Quality 9 · Batch 8 · Privacy 10 · Ease 4 · Price 10 → 8.4/10

Pros: authoritative output; full control via flags (-lossless, -q, -alpha_q); free, open source, runs locally. Cons: command-line only, and you install the binaries first.

Price: Free (open source). Who should pick it: developers scripting WebP into a build or CI pipeline. Convert with cwebp -lossless logo.png -o logo.webp.

2. Pixelor — best free and private converter for most people

Best for: anyone who wants fast, free PNG-to-WebP conversion without a terminal, an install, or handing images to a server. Pixelor runs entirely client-side — conversion happens inside your browser tab on your own device, so files are never uploaded or stored remotely. Transparency is preserved, which makes it a strong pick for logos, UI assets, unreleased work, or anything you'd rather keep private.

Quality 7 · Batch 8 · Privacy 10 · Ease 9 · Price 8 → 8.3/10

Pros: genuinely private, nothing to install, keeps the alpha channel, works in any modern browser on desktop and mobile; the free tier converts up to 5 files at once, and bulk conversion of up to 100 images runs on credits. Cons: the largest batches and bigger files use credits, and it favors convenience over the codec tuning Squoosh offers.

Price: Free for everyday use (up to 5 files at once); credit packs from $4.99 (Starter 50) unlock bulk/batch and larger files — not a subscription. Who should pick it: most people, especially anyone converting assets they'd rather not upload. Convert PNG to WebP

3. Squoosh — best for single-image quality tuning

Best for: dialing in the smallest WebP that still looks right, one image at a time. Squoosh is a free, open-source app from Google Chrome Labs whose images "never leave your device since Squoosh does all the work locally" (Squoosh). A live comparison slider lets you drag between original and compressed to find the sweet spot, and it handles PNG alpha cleanly.

Quality 9 · Batch 3 · Privacy 10 · Ease 9 · Price 10 → 8.2/10

Pros: the benchmark for hand-tuned WebP, fully private, free forever, no account. Cons: handles one image at a time — no batch mode — so it's a tuning tool, not a bulk pipeline.

Price: Free (open source). Who should pick it: designers optimizing a handful of key graphics where every kilobyte counts.

4. ImageMagick — best for power-user scripting

Best for: developers who already live in ImageMagick and want PNG-to-WebP as one step in a larger pipeline. It's a free, open-source suite with a CLI and strong scripting support on Linux, Windows, and macOS (ImageMagick). With the WebP delegate installed, magick logo.png logo.webp does the job and keeps transparency.

Quality 8 · Batch 8 · Privacy 10 · Ease 3 · Price 10 → 8.0/10

Pros: enormous control over quality, resizing, and metadata; free, local; trivial to script over folders. Cons: the steepest learning curve here, WebP output needs the libwebp delegate, and it's overkill for simple conversion.

Price: Free (open source). Who should pick it: power users automating complex image workflows.

5. XnConvert — best free desktop batch tool

Best for: converting whole folders of PNGs to WebP on a desktop, with a proper GUI. XnConvert is a fast, cross-platform batch converter for Windows, macOS, and Linux that processes files locally and supports WebP among its 70-odd export formats (XnConvert).

Quality 8 · Batch 9 · Privacy 10 · Ease 5 · Price 6 → 7.9/10

Pros: true batch processing with a GUI, cross-platform, private (offline), with resize/rename in one pass. Cons: requires an install; the interface is powerful but dated; and while it's free for private and educational use, commercial use needs a license (from around €15, as of 30 Jul 2026 — confirm on the vendor page).

Price: Free for personal use; paid commercial license. Who should pick it: desktop users with lots of PNGs wanting free, offline batch conversion. Prefer no install? A browser converter batches too.

6. towebp.io — best free browser bulk converter

Best for: quick, no-account bulk PNG-to-WebP conversion in the browser. toWebP.io converts images to WebP in bulk with a quality slider and resize options, and states that all conversions "happen locally in your browser with no uploads," preserving PNG transparency (toWebP.io).

Quality 6 · Batch 8 · Privacy 10 · Ease 7 · Price 9 → 7.8/10

Pros: free, client-side (nothing uploaded), handles batches, keeps transparency, works on any modern browser and OS. Cons: a single-purpose tool with minimal output control (a quality slider and resize, no metadata handling); the interface is basic and ad-supported.

Price: Free. Who should pick it: people who want a fast, free, private bulk converter and don't need fine-grained codec settings.

7. TinyPNG — best for compression-first workflows

Best for: a small, sensible WebP with minimal fiddling, plus an API for scale. TinyPNG lets you "transform your JPG and PNG images into the WebP format" and is known for aggressive, smart lossy compression (TinyPNG).

Quality 8 · Batch 6 · Privacy 4 · Ease 9 · Price 6 → 6.7/10

Pros: excellent default compression, dead-simple UX, solid API, popular WordPress plugin. Cons: files are uploaded to Tinify's servers; the web tool takes up to 20 images at once (5MB each) but volume runs through the API.

Price: Free web tool; API is pay-as-you-go with 500 free compressions/month, then usage-based (credit bundles from about $9 per 1,000, as of 30 Jul 2026 — confirm on their site). Who should pick it: teams wanting reliably small WebP files with little manual tuning.

8. ShortPixel — best for compression at scale and WordPress

Best for: compressing and converting large image libraries, especially on WordPress. ShortPixel pairs PNG-to-WebP conversion with aggressive optimization via a web tool, an API, and a widely used WordPress plugin, in lossy, glossy, and lossless modes (ShortPixel).

Quality 8 · Batch 7 · Privacy 4 · Ease 7 · Price 6 → 6.6/10

Pros: strong compression, flexible modes, a bulk-friendly credit model, great CMS integration. Cons: files are uploaded to ShortPixel's servers, and the credit model means large libraries need paid top-ups.

Price: Free tier with 100 credits/month; paid plans roughly $4–$10/mo (as of 30 Jul 2026 — confirm on their pricing page). Who should pick it: site owners optimizing a whole media library.

9. Convertio — best for broad format coverage

Best for: occasional conversions across a huge range of formats. Convertio is a browser-based converter — "no software installation required" — supporting 200+ formats and handling PNG to WebP with files up to 100MB on the free tier (Convertio).

Quality 7 · Batch 6 · Privacy 4 · Ease 8 · Price 6 → 6.2/10

Pros: enormous format coverage, a clean interface, an API and CLI, files purged within 24 hours. Cons: files are uploaded; the free tier is metered, so regular or high-volume use needs a paid plan.

Price: Free tier with limits; paid plans roughly $10–$26/mo (as of 30 Jul 2026 — confirm on their pricing page). Who should pick it: people who occasionally convert oddball formats and don't mind uploading.

10. FreeConvert — best for advanced options in the browser

Best for: a browser tool with real control over the WebP output. FreeConvert's PNG to WebP converter exposes a lossless toggle, quality slider, compression speed, auto-orientation, and metadata stripping, with generous free file-size limits (FreeConvert).

Quality 7 · Batch 6 · Privacy 4 · Ease 8 · Price 5 → 6.1/10

Pros: genuinely useful advanced controls for a web tool, batch support, multiple input sources (device, cloud drives, URL). Cons: files are uploaded; the free tier limits file size and adds queues and ads, removed only by upgrading.

Price: Free tier; paid plans roughly $10–$30/mo (as of 30 Jul 2026 — confirm on their site). Who should pick it: people who want fine control over WebP output without installing anything.

How to pick the right PNG to WebP converter

Match the tool to your situation rather than chasing a single winner:

• Converting unreleased or client graphics? Choose a tool that doesn't upload — Pixelor (browser), towebp.io (browser bulk), Squoosh (browser, one image), cwebp or ImageMagick (CLI), or XnConvert (desktop). The server-based converters here send images to a remote server, fine for public assets but worth knowing.
• Automating a build? cwebp is the benchmark; ImageMagick fits if it's already in your stack.
• Tuning a few key images? Squoosh's live slider gets you the smallest WebP that still looks right.
• Batch-converting for free? XnConvert (desktop), towebp.io (browser), or Pixelor (browser, up to 100 at once on credits).
• Optimizing a whole media library? TinyPNG and ShortPixel lead on compression.

One note on transparency and lossless: PNG is lossless and often carries an alpha channel, so pick a converter that supports lossless WebP with alpha when a graphic has a transparent background or crisp edges (logos, icons, UI). Google reports lossless WebP runs 26% smaller than PNG (Google for Developers); for flat photographic PNGs you can go further with lossy WebP. The same tools handle JPG to WebP, and you can squeeze results further with an image compressor. Convert PNG to WebP

Frequently asked questions

What is the best free PNG to WebP converter?

For developers, Google's free, open-source cwebp CLI produces benchmark-quality output with -lossless. For everyone else, a client-side browser tool like Pixelor is the best free option — no install, transparency preserved, and images convert on your own device without uploading. Squoosh (single images), towebp.io (bulk), and XnConvert (desktop batch) are also free and private.

Does converting PNG to WebP keep transparency?

Yes — WebP supports a full alpha channel, so a well-behaved converter preserves your PNG's transparent background. cwebp, ImageMagick, Squoosh, Pixelor, and towebp.io all keep transparency. If a tool flattens the background to white, it isn't writing an alpha channel; switch tools.

How much smaller is WebP than PNG?

Google reports WebP lossless images are 26% smaller than PNGs (Google for Developers). On an image-heavy page that reduces total transfer size and can improve Largest Contentful Paint, one of the Core Web Vitals. Flat or photographic PNGs converted with lossy WebP can shrink even more.

Is it safe to convert PNG to WebP online?

It depends on the tool. Many online converters upload your images to a server, then delete them (Convertio purges within 24 hours). A client-side converter processes files entirely in your browser, so nothing is uploaded — the safest choice for sensitive graphics. Pixelor, Squoosh, and towebp.io all work this way; see our Privacy page. Compress your images

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About this list — how we test. This roundup was researched and written by Team Pixelor. We verified each tool's features, platforms, and pricing against its official website in 2026, and test conversion workflows on real Windows, macOS, and Linux setups. Pixelor is a free, client-side file converter and compressor — files are processed in your browser and never uploaded — and, as disclosed above, it's one of the ten tools featured here. We rank honestly and point you to a competitor when it fits your job better. Learn who we are on our About page, reach us via Contact, or read how we handle files on our Privacy page.

Related tools: PNG to WebP converter · JPG to WebP · Image compressor