Is this WEBP to AVIF 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 right in your browser. 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 converter engine 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 WEBP 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 right 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.

WebP to AVIF — Free, Smaller Files, No Upload

How to convert WEBP to AVIF online

1
Drop your WEBP file
Drag and drop your Web Picture Format 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 Web Picture Format → AV1 Image File Format entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your AVIF
Your AV1 Image File 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.

WEBP vs AVIF: format overview

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
✗ Not supported in some older apps

AVIF

AV1 Image File Format

Alliance for Open Media · 2019

Compression: lossy
Color depth: 12-bit
Transparency: Yes

✓ Smallest file size of any image format (50% smaller than WebP)
✓ Excellent HDR and wide-gamut color support

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

AVIF magic bytes: 00 00 00 .. 66 74 79 70 61 76 69 66

Why convert WEBP to AVIF?

WebP brought a meaningful compression improvement over JPEG when Google introduced it, and for years it was the recommended next-generation format for web delivery. But the image format landscape has moved forward. AVIF, based on the AV1 video codec, offers another 20 to 50 percent reduction in file size compared to WebP at equivalent visual quality. For image-heavy sites with hundreds of product photos or editorial images, that additional savings translates directly into faster load times and lower CDN bandwidth costs.

All major evergreen browsers now support AVIF: Chrome added support in version 85, Firefox in version 93, and Safari in version 16. If your audience is on modern devices and browsers, serving AVIF is safe and beneficial. Platforms like Cloudinary and ImageKit already deliver AVIF automatically when the client supports it. Converting your WebP library to AVIF now positions your asset pipeline for the most efficient delivery format available today without waiting for another format transition.

The conversion from WebP to AVIF generally produces a noticeably smaller file with comparable or better perceived quality. AVIF handles smooth gradients and fine detail with fewer visible artifacts than WebP at the same file size. Encoding is computationally intensive compared to WebP, so the conversion may take longer, especially for large images. The output files retain standard color profiles and can be served with appropriate Content-Type headers in any modern web stack. For browsers that do not yet support AVIF, keeping a WebP fallback in a picture element is recommended.

Quality & file size: WEBP to AVIF

Typical file sizes: WEBP 1–3 MB → AVIF 0.8–2 MB.

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

Color depth: WEBP supports 8-bit, AVIF supports 12-bit.

Transparency: WEBP supports transparency. AVIF preserves transparency.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your WEBP files are converted 100% inside your browser. 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.