Image Compressor: Reduce Image File Size Online

The Image Compressor makes photos and graphics lighter without changing their dimensions. By default it keeps each file in its original format and re-encodes it at 80% quality: JPG stays JPG, WebP stays WebP, and PNG gets smart palette compression that keeps transparency. For typical camera and phone photos that is often enough to cut the file size by half or more, with no difference you can spot at normal viewing size.

Everything you need for everyday compression sits in one panel: a quality slider from 5 to 100, a Target size mode for hard limits such as a 100 KB upload form, an optional resize, and a format switch in case you would rather get JPG, PNG, WebP or AVIF back.

How to use it, step by step

1. Drop JPG, PNG, WebP, GIF or BMP images onto the upload area, click it to pick files, or paste an image with Ctrl+V. You can add several files at once.
2. Leave the quality at 80% or move the slider: lower numbers give smaller files, higher numbers keep more detail. Every change re-renders the preview live.
3. Need a hard limit? Switch to Target size and type a value in KB, or tap 20 KB, 50 KB, 100 KB, 200 KB, 500 KB or 1 MB. The tool finds the highest quality that fits and only shrinks the dimensions if it has to.
4. Optionally open Resize to cap the width and height (Max), scale by a percentage or set an exact size, and use Format to change the output type.
5. Compare the result with the before/after slider and check the size badge, then click Download, or Download all (ZIP) when you processed several images.

What happens to each format

• JPG is re-encoded at the chosen quality, which gives the biggest savings for photos.
• PNG is reduced to a colour palette (256 colours from 85%, 128 from 70%, fewer below) with transparency intact. If the palette version would come out larger, the lossless PNG is kept, and at 100% PNG stays fully lossless.
• WebP is recompressed as WebP; if your browser cannot write WebP, you get JPG or PNG instead.
• BMP files are saved as JPG, and GIF files become a still PNG of the first frame, because the browser encoder cannot write animation.

Tips for the best size-to-quality ratio

Photos usually look identical between 75% and 85%; below about 60% you start to see blocky edges in skies and skin. Screenshots and logos compress best as PNG, while photos without transparency are smallest as JPG or WebP. If a portal demands a fixed limit, use a dedicated page such as compress image to 100 KB. For whole folders, the bulk image compressor works the same way and zips every result, and converting to WebP often saves another quarter or more on websites.

Private, free and instant

Everything runs inside your browser: images are decoded, re-encoded and zipped on your own device and never uploaded, with no sign-up and no watermark. Location and camera data (EXIF) are stripped from every result, and files of up to 80 MB each are supported.