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Compress Image Online Free

No upload to server. Runs entirely in your browser — 100% private.

Files processed in your browser — never uploaded to our servers
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Drop your image here

or click to browse · JPG, PNG, WebP, AVIF supported

Smaller fileBetter quality

What is Compress Image Online Free?

Image compression reduces file size while maintaining acceptable visual quality. There are three main formats to choose from: JPEG (lossy compression, best for photographs, does not support transparency), PNG (lossless compression, best for screenshots, graphics, and logos that require transparency or pixel-perfect sharpness), and WebP (Google's modern format, 25–35% smaller than JPEG at equivalent quality, supported by all modern browsers since 2020). Lossy compression works by discarding high-frequency image detail that the human eye cannot perceive at normal viewing distances — this is why a 50 KB compressed photo is visually indistinguishable from a 500 KB original for most web use cases.

How to use

  1. Upload an image by dragging it into the drop zone or clicking to browse your files.
  2. Select your desired output format (JPG, PNG, or WebP) and adjust the quality slider.
  3. Optionally set a max width in pixels to resize the image proportionally while compressing.
  4. Click Compress Image to process the file.
  5. Use the before/after comparison slider to review the result, then click Download to save.

Why it matters

Page load speed is a direct Google ranking factor through Core Web Vitals, specifically the Largest Contentful Paint metric. Images account for approximately 75% of total page weight on the average website, making them the single largest contributor to slow load times. A two-second delay in page load reduces conversions by 4.42% per second according to Portent research. Compressing images before uploading them to any website, blog, or e-commerce platform directly improves both search engine rankings and user experience.

Pro tip

All processing happens entirely in your browser — no files are uploaded to any server. Your documents never leave your device. For website images, use WebP format whenever your site supports it — all modern browsers have supported WebP since 2020. For photographs, JPEG at 80% quality is visually indistinguishable from 100% quality while being 50–70% smaller. Reserve PNG only for images that require transparency or must have pixel-perfect sharpness, such as logos and screenshots containing text.

Frequently Asked Questions

No. Everything runs entirely in your browser using the Canvas API. Your images never leave your device — 100% private.
You can compress or convert between JPG, PNG, WebP, and AVIF. Input accepts any image format your browser supports, including GIF, BMP, and HEIC on compatible devices.
Typically 50–90% without visible quality loss for photos at 75–85% quality. PNG files with gradients may compress less. Preview the result before downloading.
We recommend files under 20MB for best performance. Larger files may be slow to process depending on your device and browser.
Yes — enter a max width in pixels and the image will be scaled down proportionally before compression. Leave it blank to keep the original dimensions.
You can compress and convert between JPG, PNG, WebP, and AVIF. The tool accepts any image format your browser supports as input, including GIF and BMP.
Most JPEG and WebP photos compress by 50–90% at a quality setting of 75–85 without visible quality loss. PNG files with flat colours or transparency may compress less. Always preview the result before downloading.
At quality settings of 75–85%, compression is typically imperceptible to the human eye for photos. Use the before/after slider to compare the original and compressed versions side by side before deciding to download.
Lossy compression (used by JPEG and WebP) permanently removes some image data to achieve smaller file sizes, but the reduction is usually invisible at moderate quality settings. Lossless compression (used by PNG) reduces file size without discarding any data, but typically achieves less size reduction on photos.
Currently the tool compresses one image at a time. Compress the first image, download it, then load the next one. This keeps processing fast and ensures you can preview each result.
We recommend images under 20MB for best performance. Larger images may be slow to process depending on your device and browser. The tool imposes no strict server-side limit since all processing is local.
No. All image processing happens entirely in your browser using the Canvas API. Your images never leave your device and are not stored or transmitted anywhere.