Image Compressor

Yes, our image compression tool is completely free. No account registration, no payment, no watermarks, no usage limits. All features are permanently free for all users.

No. Our image compression tool runs entirely locally in your browser, using JavaScript and Canvas API for processing. Your images are never uploaded to any server, fully protecting your privacy.

We support multiple common image formats including: JPG/JPEG, PNG, WebP, HEIC/HEIF (iPhone photo format), and AVIF. You can compress and convert these formats to WebP or JPG output.

Simply upload the HEIC format photos. Our tool will automatically recognize and process HEIC format, converting it to your chosen output format (WebP or JPG). Note that due to browser limitations, HEIC images cannot be previewed temporarily, but this doesn't affect the compression function.

WebP is a modern image format developed by Google that can reduce file size by about 25-35% compared to JPG while maintaining the same image quality. If your images are mainly for web display, WebP is recommended. If you need broader compatibility (e.g., sending to users with older software), choose JPG.

You can select or drag multiple images to the upload area at once. All images will be compressed using the same output settings. After processing, if there are multiple images, the system will automatically package them into a ZIP file for download.

We provide a quality adjustment range from 50% to 100%. Usually a quality setting around 80% can achieve a good balance between file size and image quality, with almost no visible difference. If you have higher quality requirements, you can set the quality to 90% or above.

Max edge refers to the pixel value of the longest edge of the image. For example, if set to 1920, and the original image is 4000x3000, it will become 1920x1440 after compression (width scaled to 1920, height proportionally scaled). If not set, the original size is maintained and only compression is applied.

You can control the output file size by adjusting the quality slider. Lower quality means smaller file size. It's recommended to try 70-80% quality first; if still too large, continue lowering quality or reduce the max edge size. WebP format usually has higher compression ratio than JPG.

This is because most browsers currently don't natively support displaying HEIC format. However, this doesn't affect the compression function - we convert HEIC in the background. After compression, you'll get WebP or JPG format images that can be viewed normally.

After compression is complete, click the "Download Image" or "Download ZIP" button. If only one image was processed, it will be downloaded directly; if multiple images were processed, a ZIP archive containing all compressed images will be downloaded.

Yes. Our tool uses responsive design and can be used on phones, tablets, and computers. You can open the website directly in your mobile browser and upload photos from your album for compression.

Email attachments usually have size limits (e.g., 25MB). It's recommended to set max edge to 1920 or 1280, quality to 75-80%, and output format to JPG (better compatibility). This can significantly reduce file size while maintaining good image quality.

For website image optimization: choose WebP format (higher compression ratio), set max edge according to actual display size (e.g., 1920px for carousel, 400px for thumbnails), quality around 80%. This can significantly reduce image loading time and improve website performance and SEO ranking.

PNG images can be uploaded, but note: if output format is JPG, transparent areas will become white background. If transparency needs to be preserved, choose WebP format for output, as WebP also supports transparency.