AVIF to WebP converter

Re-encode AVIF as WebP for slightly broader browser support.

Free bulk image converter

Convert images between every common modern web format — JPG, PNG, WebP, AVIF, GIF and SVG — up to 20 files in one batch, processed on our server, downloaded individually or as a single ZIP. No signup, no e-mail required.

Why convert images?

WebP and AVIF cut page weight by 25–50 % compared with the equivalent JPG or PNG — a direct win for Core Web Vitals and SEO.
JPG and PNG remain the universal compatibility floor — every CMS, every email client, every legacy reader speaks them.
SVG → raster is needed any time you have to embed a logo somewhere that doesn't understand vectors (Word docs, e-mail headers, some legacy CMSes).
GIF → static raster drops the animation and serves the first frame in a far more efficient format.
Re-encoding to a leaner format on a media library, an Instagram-export folder, or a marketing pack is the lowest-friction way to ship a faster site.

How our converter works

Upload. Pick up to 20 files (max 25 MB each), straight from your computer.
Queue. The submission creates a job in our work queue and you land on a progress page.
Convert. Our background worker picks up the job within roughly a minute and converts each file in turn. The page polls in the background; rows turn green as files finish.
Download. Each converted file gets a one-click Download link. With more than one file you also get Download all as ZIP.
Auto-cleanup. Originals and outputs are deleted from the server after 24 hours.

Supported conversions

We support every combination from the matrix below — pick the source format you have, choose the destination format you need. Each conversion has its own dedicated page (so a search for "jpg to webp" lands you on exactly the right form).

From \ To	JPG	PNG	WebP	AVIF
JPG	—	jpg-to-png	jpg-to-webp	jpg-to-avif
PNG	png-to-jpg	—	png-to-webp	png-to-avif
WebP	webp-to-jpg	webp-to-png	—	webp-to-avif
AVIF	avif-to-jpg	avif-to-png	avif-to-webp	—
GIF	gif-to-jpg	gif-to-png	gif-to-webp	gif-to-avif
SVG	svg-to-jpg	svg-to-png	svg-to-webp	svg-to-avif

HEIC sources are not yet supported on this server (requires libheif, which isn't installed). For HEIC files from iPhones, convert to JPG on the device first.

Image format quick guide

JPG (JPEG): The universal photo format. Lossy, small, no transparency, no animation. Use for photos and any image with smooth gradients where exact pixels don't matter.
PNG: Lossless, supports transparency. Larger files than JPG. Best for screenshots, logos, line art and any image where you can't tolerate compression artefacts.
WebP: Modern Google-led format. Roughly 25–35 % smaller than equivalent JPG, supports transparency and animation. Supported by every current browser since 2020.
AVIF: Newest of the bunch. Best compression of all four — often half the size of an equivalent JPG at the same visual quality. Browser support is excellent on Chrome, Edge, Firefox, Safari (Safari 16+).
GIF: Animated images, but capped at 256 colours and comparatively large. We extract the first frame and re-encode it — for animated → modern, prefer animated WebP or AV1-encoded MP4 (this tool focuses on stills).
SVG: Vector — infinite resolution, tiny on disk for simple shapes. We rasterise SVG into a high-DPI bitmap before re-encoding into your chosen format.

Quality & safety

Processed on our server — uploads aren't sent to a third party.
Sensible default qualities — JPG 88, WebP 85, AVIF 65 — a good visual/size compromise.
Transparency-aware — sources with alpha render with transparency preserved into PNG / WebP / AVIF, and flatten on a white background when the target is JPG (which has no alpha).
Originals and outputs deleted after 24 hours — every job has a token-scoped folder; the cron worker rm-rf's it once the timer hits zero.
No size inflation — images larger than 8000 px on either side are proportionally scaled down before encoding (you can't view such an image at full size in any browser anyway).

Limits

Max 20 files per batch.
Max 25 MB per file.
Max output dimension 8000 px.
Each job and its files are stored for 24 hours, then removed.
HEIC inputs are not supported on this server.
Animated GIFs collapse to their first frame; this is a still-image tool.

FAQ

Is this free?

Yes. No signup, no e-mail, no watermark.

Do you keep my images?

Uploads and converted outputs are stored on our server for 24 hours so you can re-download. After that they are removed by the cleanup worker.

Why does the conversion not start immediately?

Conversions are queued and processed by a background worker that runs roughly once a minute. This keeps the server predictable even during a traffic spike. Most jobs finish in under a minute of waiting; very large or many-file jobs may take longer.

Can I convert HEIC files from my iPhone?

Not currently — this server doesn't have libheif. iOS lets you re-save HEIC as JPG via the Photos app's export options before uploading.

Why is my AVIF / WebP bigger than the original?

Tiny or already-aggressively-compressed sources can grow when re-encoded — the container overhead alone can dominate at small sizes. For images already well below 50 KB, re-encoding is rarely worth it.

What's the difference between WebP and AVIF?

Both are modern, both beat JPG and PNG at the same visual quality, both support transparency. AVIF compresses harder but encodes more slowly; WebP has slightly broader legacy support. For a fresh project today, AVIF wins; for broad-compatibility shipping, WebP is the safer default.

When to use which conversion

Photo for a modern site: JPG → AVIF or JPG → WebP
Logo with transparency for a modern site: PNG → WebP or PNG → AVIF
Logo for an email signature: PNG → JPG (most clients don't render WebP/AVIF reliably)
SVG icon needed as a raster favicon: SVG → PNG
Animated GIF → static thumbnail: GIF → WebP (smallest) or GIF → PNG (lossless)
Photos for a legacy CMS / Word doc: WebP → JPG or AVIF → JPG

Related YouMonit tools

For a faster site overall, pair this with the web speed test to see how your URLs respond, the HTTP headers tool to confirm Cache-Control and Content-Type are being served correctly, and the SSL/TLS checker to verify your TLS configuration.