Is this WebP and AVIF converter free, and are my images private?

Yes, it is completely free with no limit on how many images you convert. It also runs entirely in your browser: your images are decoded and re-encoded on your own machine and are never uploaded to any server. Signing in is only needed to download your results, so your work can follow you across our other tools. Because nothing is uploaded, it is safe to use on confidential or client images.

Should I use WebP or AVIF?

WebP is the best default: it is supported by every current browser, keeps transparency, and is usually twenty-five to thirty-five percent smaller than JPEG. AVIF is often smaller still, sometimes half the size of a JPEG, but a few older browsers cannot display it, so it is best served with a fallback. The simplest way to decide is to convert one representative image to both here and read which size and quality you prefer.

Will converting to WebP or AVIF reduce the quality?

These are lossy formats, so at very low quality settings you will see some loss, but at a sensible quality around eighty the difference is invisible for almost every photograph while the file is a fraction of the size. The tool draws the converted image on screen and shows the exact size next to the original, so you can judge the quality with your own eyes before you download anything.

Why is the AVIF option sometimes greyed out?

Not every browser can create AVIF files, even though most can display them. Rather than hand you a file that is secretly a renamed PNG, the tool checks whether your browser can genuinely encode AVIF and disables the option when it cannot. When that happens, WebP gives you almost the same saving and works everywhere, so it is the recommended choice.

Can I convert a WebP or AVIF back to JPEG or PNG?

Yes. The tool converts in both directions, so you can turn a WebP or AVIF back into a JPEG for a system that does not understand modern formats, or into a lossless PNG. Just add the file and choose JPEG or PNG as the target. Keep in mind that converting a lossy file to another lossy format loses a little more detail each time, so start from the best original you have.

How many images can I convert at once?

You can add up to thirty images at a time, set the format and quality once, and every image is converted with those settings. You can then download them individually or grab the whole set as a single zip file. Because everything happens in your browser rather than on a server, there are no per-file charges and no queue.

Free Tool

Free WebP & AVIF Converter, modern image formats in your browser

Convert a batch of JPEG, PNG or GIF images to modern WebP or AVIF, or convert the other way back to JPEG or PNG, right here in your browser. See the real size saving on every image before you download, grab one file or the whole set as a zip, and know that nothing is ever uploaded because every image is converted on your own machine.

Modern image formats are the single biggest, easiest win available to almost any website, and almost nobody takes it. WebP and AVIF store the same picture in a fraction of the bytes of an old JPEG or PNG, which means faster pages, better Core Web Vitals and a lighter bill for everyone, yet most sites still ship the heavy originals because converting them is a chore. The tools that exist make it worse: they upload your images to a server you know nothing about, they cap how many you can do at once, they hide the vector-clean output behind a sign-up, and worst of all they tell you a format is smaller without ever showing you the actual numbers for your actual image, so you convert on faith and hope. Format choice is not one-size-fits-all either. AVIF is usually the smallest but a few browsers still cannot create it, WebP is the safe modern default that works everywhere, and sometimes a plain JPEG is genuinely the right answer. This tool is built to make the right choice obvious: it converts entirely on your machine so nothing is uploaded, it shows you the true before and after size for every image, and it only offers AVIF when your browser can actually produce it, so you are never handed a mislabelled file.

Why WebP and AVIF beat JPEG and PNG

JPEG and PNG are decades old, and image compression has improved enormously since. WebP, from Google, typically produces a file twenty-five to thirty-five percent smaller than an equivalent JPEG and dramatically smaller than a PNG, while keeping a transparency channel that JPEG never had. AVIF, built on the AV1 video codec, goes further again, often halving the size of a JPEG at the same visible quality, and it handles both photographs and flat graphics well. The reason they win is smarter maths: newer codecs predict and encode pixels far more efficiently than the block-based approach JPEG has used since the early nineties. For a website this is not a cosmetic gain. Images are usually the heaviest thing on a page, so cutting their weight in half is the fastest route to a quicker load, a better Largest Contentful Paint score, and a site that feels instant on a phone and a slow connection. This tool lets you convert to either format and, crucially, shows you the exact saving for your own images so the benefit is a measured fact, not a slogan.

Which format to choose, and when

There is no single best format, only the best format for a given job and audience. WebP is the sensible default: every current browser can display it, the savings over JPEG and PNG are large, and it keeps transparency, so for most websites converting your JPEGs and PNGs to WebP is the whole job done. AVIF is the choice when you want the absolute smallest file and are willing to let a small number of older browsers fall back to something else, which a properly built site does automatically with a picture element. Reach for JPEG when you specifically need the widest possible compatibility with old software or a system that does not understand modern formats, and keep PNG only when you need a truly lossless copy or pixel-perfect flat graphics with sharp edges. Because this tool converts a whole batch in one pass and shows the resulting size for each format, the easiest way to decide is to try WebP and AVIF on a representative image and simply read which one gives you the size and quality you want.

Lossy, lossless, and why the numbers matter

WebP, AVIF and JPEG are lossy formats, which means they reach their small sizes by discarding detail the eye is least likely to notice, and a quality dial controls how much. Set it high, around eighty, and the loss is invisible for almost every photograph while the file is a fraction of the original. Push it very low and you start to see the smudging and banding that gives over-compressed images away. PNG is lossless, so it keeps every pixel exactly and ignores the quality dial entirely, which is why a PNG is heavier but perfect. The trap most converters fall into is asking you to trust that a setting is fine without letting you check, so this tool does the opposite: it draws the converted image on screen and prints the real file size and the exact percentage saved next to the original, for every image. If a conversion ever comes out larger than the source, which can happen when you convert an already-optimised file, it tells you plainly so you keep the better original instead.

How to use it

1
Add your images
Drag images straight onto the tool or click to choose them. Add up to thirty at once, in JPEG, PNG, WebP, GIF, BMP or AVIF. Every file is decoded and converted in your browser, so nothing is uploaded and even confidential images never leave your machine.
2
Choose the target format
Pick WebP for the safe modern default that works everywhere, AVIF for the smallest possible file where your browser supports it, or JPEG and PNG to convert the other way for compatibility. AVIF is shown only when your browser can actually encode it, so you are never handed a mislabelled file.
3
Set the quality
For the lossy formats, drag the quality slider to trade size against fidelity. Around eighty is invisible for most photographs and already a large saving; lower it further only if you need every last byte. PNG ignores the dial because it is lossless and keeps every pixel exactly.
4
Check the saving and download
Read the real before and after size and the exact percentage saved on each image, and see the converted result on screen. Then download a single file or the whole batch as one zip. Exporting asks you to sign in with a free account, which is the only thing an account is for; converting and previewing are always free.

Common mistakes

Converting to AVIF without a fallback

AVIF is the smallest format but a small number of older browsers still cannot display it. On a website, always serve it inside a picture element with a WebP or JPEG fallback so every visitor sees an image. If you need one file that simply works everywhere, WebP is the safer choice.

Setting the quality far too low

Crushing the quality slider down to make a tiny file introduces visible smudging and colour banding, which looks cheap and defeats the point. Keep quality around eighty for photographs, check the result on screen, and only go lower when a specific size budget forces your hand.

Re-converting an already-optimised image

Running a file that is already a well-compressed WebP or AVIF through another lossy pass throws away more detail for little or no size gain, and can even make it larger. Convert from the highest-quality original you have, and if the tool reports the result is bigger, keep the original.

Converting but never resizing

A modern format on a four thousand pixel photo shown in an eight hundred pixel slot is still wasteful, because the browser downloads all those pixels and throws most away. Resize the image to the size it will actually be shown at first, then convert, so the file is light on both counts.

Questions

Is this WebP and AVIF converter free, and are my images private?: Yes, it is completely free with no limit on how many images you convert. It also runs entirely in your browser: your images are decoded and re-encoded on your own machine and are never uploaded to any server. Signing in is only needed to download your results, so your work can follow you across our other tools. Because nothing is uploaded, it is safe to use on confidential or client images.
Should I use WebP or AVIF?: WebP is the best default: it is supported by every current browser, keeps transparency, and is usually twenty-five to thirty-five percent smaller than JPEG. AVIF is often smaller still, sometimes half the size of a JPEG, but a few older browsers cannot display it, so it is best served with a fallback. The simplest way to decide is to convert one representative image to both here and read which size and quality you prefer.
Will converting to WebP or AVIF reduce the quality?: These are lossy formats, so at very low quality settings you will see some loss, but at a sensible quality around eighty the difference is invisible for almost every photograph while the file is a fraction of the size. The tool draws the converted image on screen and shows the exact size next to the original, so you can judge the quality with your own eyes before you download anything.
Why is the AVIF option sometimes greyed out?: Not every browser can create AVIF files, even though most can display them. Rather than hand you a file that is secretly a renamed PNG, the tool checks whether your browser can genuinely encode AVIF and disables the option when it cannot. When that happens, WebP gives you almost the same saving and works everywhere, so it is the recommended choice.
Can I convert a WebP or AVIF back to JPEG or PNG?: Yes. The tool converts in both directions, so you can turn a WebP or AVIF back into a JPEG for a system that does not understand modern formats, or into a lossless PNG. Just add the file and choose JPEG or PNG as the target. Keep in mind that converting a lossy file to another lossy format loses a little more detail each time, so start from the best original you have.
How many images can I convert at once?: You can add up to thirty images at a time, set the format and quality once, and every image is converted with those settings. You can then download them individually or grab the whole set as a single zip file. Because everything happens in your browser rather than on a server, there are no per-file charges and no queue.

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