Image Compressor

Compress images online, free and private

To compress an image online, click Select Images, choose Lossy or Lossless (PNG), set the Quality slider (80% by default) or tick Target File Size and type a size in KB, then click Download. The tool re-encodes each picture with your browser's own encoders and shows the new size and the percentage saved. It never hands back a bigger file: if re-encoding would not shrink an image, you get the original unchanged, with a note.

The saving is (1 - compressed size / original size) x 100, shown as a badge such as -67%. Compression changes only the file size, not the width or height. This free image compressor runs in your browser, so nothing is uploaded, and you can confirm that in the Network tab of DevTools. Files that are re-encoded also lose their EXIF metadata, including any GPS position.

Need fewer pixels as well? Set the dimensions first with the image resizer, or cut away the parts you do not need with the image cropper, then compress.

Table of Use: settings for common jobs

One catch: with Output Format on Auto, an opaque PNG is saved as a JPG. To keep PNG, pick Lossless (PNG). If you only want to change format, the PNG to JPG converter and the PNG to WebP converter do that with their own settings.

Features

• Lossy and Lossless (PNG) modes. Lossy trades detail for size; Lossless keeps every pixel and saves a PNG, and returns files it cannot copy exactly, such as 16-bit PNGs, unchanged.
• Output Format. Auto keeps JPG as JPG and WebP as WebP, saves images with transparency as WebP and everything else as JPG. You can also force JPG or WebP.
• Quality from 10% to 100%. The slider starts at 80%.
• Target File Size in KB. The tool encodes at your slider quality first, then searches downward between that value and 2% for the highest quality that fits.
• Never bigger. If the result is not smaller than the original, the original file is returned and a note says why.
• Animation aware. Animated GIF, WebP, PNG and AVIF files are detected and left unchanged unless you tick Convert to a still image.
• Comparison Slider. Drag across each preview to compare Compressed and Original.
• Batch and totals. Add any number of images. They are processed one at a time, and the header shows the total saved.
• Honest file names. Downloads are named like photo_compressed.jpg, with the extension of the format actually produced.

Inputs are JPG, PNG, WebP, GIF, BMP and AVIF; SVG is not accepted. BMP files are uncompressed, so they shrink a lot here; for a lossless result use the BMP to PNG converter. If you embed pictures as text, compress first: the image to Base64 converter output is about a third longer than the file it encodes.

How to compress an image, step by step

1. Click Select Images or drag files onto "Upload Images to Compress". Several at once is fine.
2. Under Compression Settings choose a Compression Mode: Lossy or Lossless (PNG).
3. In Lossy mode, pick an Output Format and move the Quality slider. Or tick Target File Size and type a number of KB; the slider becomes Maximum Quality.
4. Wait for each file to show its new size. The badge reads -NN% when it got smaller, or unchanged when the original was kept.
5. Drag the Comparison Slider to check the result by eye.
6. Click Download under one image, or Download All (ZIP).

Who can use it

• Bloggers and web developers trimming page weight, perhaps after making a thumbnail for the listing.
• Job applicants and form fillers who must stay under a 100 KB or 500 KB upload limit.
• Online sellers with dozens of product photos to prepare, after straightening any sideways phone shots with the image rotator.
• Students and office staff emailing scans and screenshots that bounce for size.
• Designers handing over lighter previews, with a watermark added before export.

FAQs