Is this PNG to WEBP converter really free?

Yes. Up to 5 files at a time, no signup, no catch. The free tier adds a small watermark to image output — Pro ($9.99/mo or $49/yr) removes it, raises the file size limit to 500 MB, and unlocks unlimited batch conversion.

Are my files uploaded to a server?

No — and you can verify it yourself. Open DevTools → Network tab, then convert a file. You'll see zero upload requests. Everything runs in your browser via WebAssembly. We never see your files.

How long does conversion take?

Usually 1–3 seconds for a typical file. The very first conversion on a fresh page load may take 5–20 seconds while the WebAssembly codec loads — after that it's instant. Your CPU does all the work locally.

What is the file size limit?

Free: up to 10 MB per file, 5 files per batch. Pro: up to 500 MB per file, unlimited batch. If you're working with large videos or RAW photos, Pro is built for that.

Can I batch convert multiple PNG files at once?

Yes — drop multiple files at once (or Ctrl/Cmd+click to select them) and they all convert in parallel. Free accounts handle up to 5 files per batch; Pro has no limit.

Will the image quality change after conversion?

It depends on the formats involved. Converting to a lossless format like PNG preserves every pixel exactly. Converting to a lossy format like JPEG or WebP applies compression — we default to 85% quality, which looks identical to the original for almost all images. You won't notice a difference unless you zoom in pixel-by-pixel.

Do you support batch image conversion?

Yes — drop multiple images at once and they all convert in parallel. Free accounts handle up to 5 at a time; Pro is unlimited. Download everything as a single ZIP when you're done.

How private is this converter?

Completely private — by design, not policy. There is no upload endpoint. Files are processed using WebAssembly inside your browser tab and disappear the moment you close it. We collect only anonymous page-view counts; your file content is never seen or stored.

PNG to WEBP Converter — Free, Fast, In-Browser

How to convert PNG to WEBP online

1
Drop your PNG file
Drag and drop your Portable Network Graphics file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs Portable Network Graphics → Web Picture Format entirely in your browser tab using WebAssembly. Most files finish in 1–3 seconds.
3
Download your WEBP
Your Web Picture Format file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

PNG vs WEBP: format overview

PNG

Portable Network Graphics

PNG Development Group (Thomas Boutell) · 1996

Compression: lossless
Color depth: 16-bit
Transparency: Yes

✓ Lossless compression — pixel-perfect quality
✓ Full alpha transparency (8-bit alpha channel)
✗ Large file sizes for photos

WEBP

Web Picture Format

Google (On2 Technologies acquisition) · 2010

Compression: hybrid
Color depth: 8-bit
Transparency: Yes

✓ 30% smaller than JPEG, 26% smaller than PNG
✓ Supports both lossy and lossless

PNG magic bytes: 89 50 4E 47 0D 0A 1A 0A

WEBP magic bytes: 52 49 46 46 xx xx xx xx 57 45 42 50

Why convert PNG to WEBP?

If you've ever tried to open a PNG file and hit a wall — the app won't accept it, the website rejects it, or the preview just shows a broken icon — you already know why this conversion matters.

Portable Network Graphics is great for what it was designed for, but it has real-world limitations: large file sizes for photos and no exif gps data by spec. The moment you step outside that original context, it gets frustrating fast.

Web Picture Format is the safer choice for Web images, Product photos, Web animations. Its main advantages — 30% smaller than jpeg, 26% smaller than png and supports both lossy and lossless — mean it just works wherever you need it.

A few common reasons people end up here: - Their target app, site, or device doesn't accept PNG - They need a smaller file for email or upload (WEBP often compresses better) - They need Web Picture Format's specific capability: 30% smaller than jpeg, 26% smaller than png - Compatibility with older software that pre-dates Portable Network Graphics

The conversion is one-way: you get a WEBP that works everywhere Web Picture Format is expected. The original PNG file is not touched.

Quality & file size: PNG to WEBP

Typical file sizes: PNG 8–25 MB → WEBP 1–3 MB.

Both PNG and WEBP use lossy compression. We transcode at high quality settings (equivalent to WEBP's recommended web quality) to minimize generational loss.

Color depth: PNG supports 16-bit, WEBP supports 8-bit.

Transparency: PNG supports transparency. WEBP preserves transparency.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your PNGfiles are converted 100% inside your browser using WebAssembly. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.