Image Tools
Image Compressor
Reduce image file size in your browser with adjustable quality, format, and a download-ready preview.
Processed locally in your browser. Your files are not uploaded.
Choosing a Quality Level Without Guessing
The quality slider is not linear perception: 90→70 usually halves the file with changes you must squint to see, while 70→40 introduces the blocking and banding everyone recognizes. For web photography the practical sweet spot is 70–85%, and the live estimate beside the preview lets you watch the size drop before you commit.
Format is the bigger lever than quality. A screenshot saved as JPG wastes most of its bytes on flat areas that compress almost free in PNG or WebP; a photo saved as PNG carries no benefit and costs 3–5× the bytes of an equal-quality JPG. Matching format to content typically saves more than any slider move.
Picking Quality and Format Without Visible Loss
For photographs, JPEG quality between about 70 and 85 usually cuts file size by half or more with differences that are hard to see at normal viewing size. Below 60, blocky artefacts appear around edges and in smooth gradients such as skies. WebP typically reaches the same visual quality at a smaller size, and it is supported by every current browser.
Screenshots, logos and diagrams behave differently: PNG keeps text crisp and has no quality dial, so shrinking it means reducing dimensions or the number of colours. Compress after resizing to the largest size the page really displays, since an oversized image wastes bytes however well it is compressed. Keep the original, because each re-compression of a JPEG loses a little more detail.
What Happens When You Compress
- Load an image by dragging and dropping it onto the canvas or using the file picker. JPG, PNG, and WebP are supported.
- Drag the quality slider (5%–100%) to control the compression strength. Lower quality means a smaller file and more visible artifacts.
- Read the live estimate that shows the original size, the compressed size, and the percentage saved before you export.
- Download the compressed copy. The original file on your device is never modified.
Example: Before and After
Common Questions
Is image compression lossy?
Yes, the quality slider controls a lossy re-encode. Choose 100% if you need a visually lossless result, but the tool only re-encodes — it never touches your original file.
Why is a smaller file important for a website?
Smaller images load faster, use less bandwidth, and improve Core Web Vitals metrics such as Largest Contentful Paint (LCP), which also matters for search ranking.
Does the tool keep transparency?
For PNG and WebP sources transparency is preserved. JPG does not support alpha channels, so transparency is filled with a background color instead.
Related Image Tools
Image Resizer
Set exact image dimensions with a ratio lock and export a resized copy without uploading your image.
Image Format Converter
Convert common raster images locally to JPG, PNG, or WebP and download the new format.
EXIF Metadata Remover
Re-encode an image to remove common embedded metadata before sharing it online.