Image compressor and WebP/AVIF converter

Reduce image size without visible loss, compress photos in bulk or convert them to WebP and AVIF. It all happens in your browser; no file is uploaded to a server.

Images

No images yet. Compression starts as soon as you add them.

Settings

Each file keeps its format: JPEG stays JPEG, PNG stays PNG. GIF and BMP become lossless PNG.

Aspect ratio is kept; images already smaller are never enlarged.

Lower means a smaller file and more artefacts. At the starting value the loss is invisible on most photos.

PNG is lossless; nothing is taken from the image, the data is only packed tighter. Tighter packing takes longer.

  • EXIF, GPS location and camera details are removed. The photo's orientation is applied first.
  • Up to 60 images at a time, each up to 50 megapixels.

Let’s make it yours

Need a version of this with your brand on it, wired into your own systems? Bulk jobs, an API, a panel or an automation — tell us about it and we will scope it together.

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Smaller images, without sending them anywhere

Reducing image size is two jobs: bringing the pixel dimensions down and saving the file again with a more efficient encoder. A 4 MB phone photo resized to 1920 pixels on its long side and converted to WebP usually ends up at a few hundred kilobytes. JPEG goes through MozJPEG, WebP through libwebp, AVIF through libavif and PNG through OxiPNG, all running as WebAssembly in the background, so the page never freezes.

To compress images, drop them on the box, choose them or paste them; as a bulk image compressor it takes up to 60 files at a time. Work starts as soon as they are in, and changing the format, quality or longest side redoes only the files it affects. To use it as an AVIF converter, pick AVIF: files come out smallest, though each can take a few seconds. In the comparison view you slide a divider across the before and after. If a result comes out larger, the tool says so and offers the original instead. Then download everything as one ZIP.

Most sites that compress images start by uploading your files to their server. Here, nothing leaves your device. EXIF, GPS location and camera details are dropped too, so a shared photo no longer says where it was taken. Orientation is applied first, so a portrait shot does not come out sideways.

Made by KARSH

A software company based in Erzurum and Istanbul. Web, mobile, desktop, automation and AI. karsh.app

Questions

How do I reduce image size without losing quality?

Most of the saving comes from pixel dimensions: if 1920 pixels is enough on screen, shrinking a 4000-pixel photo cuts the file to roughly a quarter. For quality, around 75 for WebP and 78 for JPEG is indistinguishable on most photos; the comparison view lets you check for yourself.

Are my images uploaded anywhere?

No. Images are processed inside this page, in your browser. The only thing downloaded from the site is the encoders themselves; your files are never sent anywhere.

WebP or AVIF: which should I pick?

WebP opens in every current browser and encodes quickly, which makes it the safe choice for a website. AVIF gives smaller files at the same quality but encodes slowly, and some older software cannot open it. For email or an official form, staying with JPEG causes the fewest problems.

Why won't my iPhone photos (HEIC) open?

Chrome and Firefox cannot open HEIC. HEIC files already on a computer can be saved as JPEG with Preview on a Mac or the Photos app on Windows, then dropped here; photos picked from this page on the iPhone itself are converted to JPEG by the phone. For new photos, Settings › Camera › Formats › Most Compatible saves them as JPEG from the start.

How many images can I compress at once?

Up to 60 images at a time, each up to 50 megapixels. The limit is there to protect your browser's memory; when a batch is done, download the ZIP and start the next one.

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