Converting a folder of pictures in one go
1. Drop in as many as you like
Up to forty pictures at a time — PNG, JPG, GIF, BMP, or anything else your browser opens. They are listed in file-name order so a numbered set stays in sequence.
2. Choose a quality, or a size to hit
Either set the quality once for the whole batch, or say “get every one under 100 KB” and let the tool work out the quality each picture needs on its own.
3. Shrink the oversized ones on the way
A 4000-pixel photograph from a phone is far larger than any web page needs. Capping the width does more for the file size than any quality setting, and it happens in the same pass.
4. Convert
Everything runs on your machine, a few dozen milliseconds per picture. A batch of three mixed images took 94 milliseconds in testing.
5. Compare them side by side
Each picture is shown before and after, next to each other, with both file sizes and the percentage saved. A chequerboard sits behind both so you can see transparency survive. The panel above totals the whole batch.
6. Save them
Download each one individually, or save the lot in sequence. Your browser will ask once whether this page may save several files.
What converting to WebP actually saves you
This is the whole reason the format exists, and the version of this page before 29 August 2026 never told you. It converted your picture and reported “Ready — 600×400px”. Measured on that build: a photographic PNG of 330,111 bytes came back as 70,774 bytes. It had saved you 79% and said nothing about it.
The saving is now the headline, per picture and for the batch together. In testing, three mixed images went from 902.8 KB to 162.0 KB — 82% smaller, 740 KB saved — and the tool says so in those words.
Looking at both versions at once
A converter that only reports a number is asking you to take its word for it. Every picture is shown twice here — the original on the left, the WebP on the right — with both file sizes underneath and the saving spelled out. That is the only way to answer the question that actually matters, which is not “how much smaller” but “how much smaller before it starts to look worse”.
Both panels sit on a chequerboard rather than white. That is deliberate: this tool preserves transparency, and on a white background a see-through area and a white area are indistinguishable. With the chequerboard you can see at a glance that a logo’s clear background came through intact.
Change the quality and convert again; both panels update, so you can walk the setting down until the difference becomes visible and then step back one.
Setting a quality, or naming a size
Quality is the straightforward way. Around 80 is the usual sweet spot for photographs; at that setting WebP is typically a quarter to a third the size of the same picture as JPG. Flat graphics, screenshots and logos can go higher without costing much, because there is less detail to throw away.
A size target is the other way round, and it is the one to use when something else has set the rule — a marketplace that rejects anything over 200 KB, a theme that wants hero images under 150, an email that must stay small.
Hitting a target is a search, not a formula: the relationship between quality and file size is different for every picture. The tool bisects the quality range eight times per image, which lands within a fraction of a percent of your figure. If quality alone cannot get there it reduces the dimensions in steps as well, and if even that fails it says so plainly rather than handing you something over the limit and staying quiet.
You can see that working in the test run: asked for 20 KB, three very different pictures came back at 19.7 KB, 19.8 KB and 890 bytes — at qualities of 66, 10 and 95 respectively. The small transparent graphic was already well under, so it kept its quality; the large photograph needed pushing hard.
Transparency survives, EXIF does not
Three things happen to a picture on the way through, and you should know all three before you delete your originals.
Transparency is kept. A PNG with see-through areas comes out as a WebP with see-through areas — verified with a cut-out that converted with its alpha channel intact. This is one of WebP’s genuine advantages: it offers transparency like PNG and compression like JPG, which is why a logo with a clear background converts so well here.
EXIF is dropped. Camera model, exposure, dates, GPS coordinates and copyright fields do not survive. That is a privacy improvement if you are publishing a photograph — those coordinates are the location it was taken — and a real loss if you were relying on them. Keep your originals.
Animation is lost. An animated GIF converts to a still picture of its first frame. Animated WebP exists, but it is a different thing to write and this tool does not produce it. For an animation, keep the GIF.
Why WebP is smaller than the file you started with
WebP, published by Google in 2010, compresses using techniques borrowed from video encoding: it predicts each block of pixels from the blocks already decoded around it and stores only the difference. JPEG, designed in 1992, has nothing of the sort. That prediction step is most of where the saving comes from, and it is why the advantage is largest on photographs with large areas of gradual change — skies, skin, walls.
Against PNG the saving is different and usually larger, because PNG is lossless: it stores every pixel exactly. A photograph saved as PNG is enormous for no visible benefit, which is why the 746 KB above became 130 KB with no difference you would notice at normal size.
Support is no longer a question — every current browser reads WebP, and has for years. If you need to check a specific old version, the support table has it. This page checks your own browser’s ability to write WebP before it starts, because a couple of older ones quietly hand back a PNG when asked for one, and a file named .webp that is secretly a PNG causes trouble later.
When WebP is the wrong choice
Worth saying on a page whose job is producing it.
- Keep your masters. This is lossy conversion. Convert copies for the web and keep the originals somewhere; you cannot get the detail back by converting a WebP to something else.
- Printing. Print shops want TIFF, PDF or high-quality JPEG. WebP is a web format and some print workflows will simply refuse it.
- Animation. Covered above — keep the GIF, or use a video.
- Somewhere that will not accept it. Some older content systems, email clients and marketplace uploaders still reject the extension. Convert to JPG for those instead.
Nothing you convert leaves this device
Your pictures are read from your disk into this page, converted by the image encoder already built into your browser, and handed straight back. There is no upload, which is why there is no queue, no account, no watermark and no limit on how many you convert — and why photographs with location data in them never reach anybody else’s machine.
You can confirm it: open your browser’s developer tools, switch to the Network tab, and convert something. Nothing carries your image, because nothing is sent.
Questions people ask about converting to WebP
How much smaller will my images actually get?
For photographs, usually 25–35% smaller than the same picture as a good JPG, and often 70–85% smaller than a PNG. Flat graphics and screenshots vary much more. The tool shows you the real figure for your own files rather than a promise.
Will the quality visibly drop?
At quality 80 or above, rarely at normal viewing size. Below about 50 you will start to see it on detailed areas. If a specific file size is what matters, use the target mode and let the tool find the highest quality that fits.
Can I convert a whole folder at once?
Yes, up to forty at a time. Select them all in the picker or drag the lot in. This is the main thing the previous version could not do.
Does it keep transparent backgrounds?
Yes, and that is one of the best reasons to use WebP for logos and icons: you get PNG-style transparency at something much closer to JPG file sizes.
Why is my converted file bigger than the original?
Usually because the original was already efficiently compressed — a small, well-optimised JPG or a simple graphic with few colours. The tool tells you when this has happened rather than pretending it is a saving. Keep the original in that case.
What happened to my photo’s date and location?
They are gone. Browser image encoding does not carry EXIF through. For publishing that is usually a good thing; if you need that data, keep your originals.
Can I convert a WebP back to JPG or PNG?
Yes, with our image converter — though converting back cannot restore detail the first conversion discarded.
Is there a file size limit?
Only your own machine’s. Nothing is uploaded, so there is no server rule. Very large pictures use memory while they are decoded, so a huge batch of enormous files is the one case where a browser may struggle.
Does it work on a phone?
Yes. Choosing many pictures at once works from the phone’s own picker, and the conversion runs on the handset.