About Image Compressor
Large images are the single most common reason web pages feel slow. A photo straight out of a phone camera is often 4–8 MB, while the same picture displayed at the size a visitor actually sees it rarely needs more than a few hundred kilobytes. Compression closes that gap by re-encoding the image with a codec setting that discards detail the eye is unlikely to notice.
This compressor decodes your image in the browser, redraws it onto a canvas and re-encodes it at the quality you choose. You see the original size, the compressed size and the percentage saved before you commit to a download, so you can dial the quality up or down until the trade-off looks right on your own screen.
There is also a target-size mode. Give it a number — 200 KB for an email attachment, 1 MB for a forum upload — and it searches for the highest quality setting that still fits under your limit, so you do not have to guess at percentages.
How to compress an image
Add your images
Drag files onto the drop zone or tap Select Images. You can compress up to 30 images at once.
Pick a quality level
Drag the quality slider, or switch to target size mode and type the maximum file size you need.
Compress
Press Compress. Each image is re-encoded on your device and the savings appear next to it.
Download
Download images one at a time, or use Download all to save every compressed file at once.
Choosing the right quality setting
Quality is not a percentage of visual fidelity — it is a knob on the encoder, and the relationship between the number and what you see is not linear. In practice a few ranges cover almost every use case:
- 90–100% — near-lossless. Use it for photography portfolios and print-bound images where artefacts are unacceptable.
- 75–85% — the sweet spot for the web. Most people cannot tell an 80% JPEG from the original at normal viewing distance, and the file is typically 60–80% smaller.
- 50–70% — aggressive. Fine for thumbnails, background images and anything displayed small.
- Below 50% — visible blocking and colour banding. Only worth it when file size matters far more than appearance.
A note about PNG
PNG is a lossless format, so it has no quality dial in the way JPEG and WebP do. If you compress a PNG here, the tool re-encodes it as PNG and the savings are usually modest — mostly from dropping metadata and simplifying the encode.
For photographs saved as PNG, the far bigger win is changing format. Converting to JPEG or WebP frequently cuts the file to a tenth of its size with no visible difference. If your PNG has a transparent background, use WebP rather than JPEG, because JPEG cannot store transparency.