Image Compressor

Heavy images are the number one reason pages load slowly, and most of them are far heavier than they need to be: a phone photo at full quality might weigh 5 MB when an 800 KB version looks identical on screen. This compressor re-encodes JPG and PNG images at the quality level you choose, with a live preview and an honest before-and-after size readout, so you can find the sweet spot where the file shrinks dramatically and the picture still looks clean. Everything happens on your device using the browser’s own image engine — your photos are never uploaded to a server, which makes this safe for client work, product shots and personal pictures alike.

Quick Answer: Upload a JPG or PNG, drag the quality slider, compare the preview and the new file size, then download the compressed image.

Free Online Tool

Smaller files, same picture — judged by your eyes, not a guess.

Choose an image (JPG or PNG)

Quality: 80%

Max width in px (0 = original size)

—Original

—Compressed

—Saved

Compressed preview

How to Use the Image Compressor

Drop an image onto the tool or click to choose one from your device.
The original size and dimensions appear, with the image previewed.
Move the quality slider: lower means smaller file, and the preview updates so you can judge the trade-off.
Watch the new size and percentage saved update beside the original.
Download the compressed image when the balance looks right.

Key Features

Quality slider with live preview and instant size feedback.
Works with JPG and PNG photos, screenshots and graphics.
Shows original versus compressed size and the percentage saved.
Optionally resize the image down at the same time for extra savings.
Fully private: images are processed in your browser, never uploaded.

Best Practices and Tips

For photographs, quality 75-85 usually halves the file with no visible difference — start there before going lower.
Text in screenshots suffers at low quality; keep UI captures at 90+ or use PNG.
Compress the largest version you have, not an already-compressed copy; re-compressing compounds artefacts.
If an image will display at 800px wide, resize it to 800px — dimensions save more bytes than quality alone.
Keep your originals archived. Compression is a delivery step, not a storage format.

Common Mistakes to Avoid

Judging quality zoomed out: check the preview at 100% around faces and fine detail, where artefacts show first.
Expecting PNG photos to shrink like JPGs; PNG is lossless for photos and stays heavy — convert to JPG for photographic content.
Compressing an image that will be printed at large size on screen-quality settings.
Re-uploading a compressed image to a platform that compresses again, stacking two rounds of quality loss.

Frequently Asked Questions

Will compression visibly damage my photo?

At sensible settings, no. The quality slider exists so you can see exactly what changes before downloading: most photos at 80 quality are indistinguishable from the original while being a fraction of the size. Low settings (below 50) trade visible softness for extreme savings — useful for thumbnails, wrong for hero images.

Why is my PNG still huge after compression?

PNG uses lossless compression suited to graphics with flat colours and sharp edges. Photographs contain millions of subtle colour changes that PNG must store exactly. Converting a photo PNG to JPG almost always wins; the converter tools on this site handle that in one step.

Are my images uploaded to a server?

No. The browser’s built-in canvas engine does the re-encoding locally. You can confirm this by using the tool with your connection off after the page loads — it still works.

What is the best format for web images?

For photos, JPG (or modern WebP where supported) at quality ~80. For logos, icons and screenshots with text, PNG keeps edges crisp. This compressor handles both, and the resize option covers oversized originals.

Is there a file size limit?

Only your device’s memory. Typical phone photos and screenshots process instantly; gigantic RAW-era files (50 MB+) may take a few seconds or be better handled by desktop software first.