Compress Image Online - Reduce Image File Size
Reduce image file size without significant quality loss. Compress JPEG, PNG, WebP, and BMP images directly in your browser using the Canvas API. No uploads required.
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About This Tool
How to Use
- 1Click the upload area or drag and drop an image file (JPEG, PNG, WebP, or BMP) into the tool.
- 2Adjust the Quality slider to set your desired compression level. Lower values produce smaller files but reduce visual detail.
- 3Select an output format from the dropdown. Choose "Same as original" to keep the current format, or pick JPEG, PNG, or WebP.
- 4Click the "Compress" button to start the compression process. It runs entirely in your browser.
- 5Review the compressed result, including the new file size and reduction percentage shown in the metadata.
- 6Download the compressed image to your device, or adjust the settings and compress again for a different result.
When to Use
- •When you need to reduce image file sizes for faster website loading and better Core Web Vitals scores.
- •Before uploading photos to social media, email, or messaging apps that have file size limits.
- •When optimizing product images for an e-commerce store to improve page speed.
- •To reduce storage consumption when archiving a large number of photographs.
- •When preparing images for a presentation or document to keep the overall file size manageable.
- •Before embedding images in emails where large attachments may be blocked or slow to send.
Tips & Tricks
- ✨A quality setting of 60-80 typically provides the best balance between file size reduction and visual quality for photographs.
- ✨WebP format generally produces the smallest files of the three output options, with excellent quality at lower sizes.
- ✨PNG compression is lossless regardless of the quality slider, so switching to JPEG or WebP will yield much larger size reductions for photos.
- ✨For images with transparency, use PNG or WebP output. JPEG does not support transparency and will fill transparent areas with a white background.
- ✨Compress before resizing for best results. Reducing dimensions first and then compressing can sometimes introduce artifacts.
- ✨Use the preview to visually compare the compressed output against the original before downloading.
Frequently Asked Questions
No. All processing happens locally in your browser using the Canvas API. Your image never leaves your device, ensuring complete privacy.
You can compress images up to 20 MB in size. For very large images, the processing time depends on your device performance.
WebP generally produces the smallest files with comparable visual quality. JPEG is a good second choice for photographs. PNG is lossless and tends to produce larger files, but it preserves transparency.
No. Compression only reduces the file size by adjusting encoding quality. The pixel dimensions of your image remain unchanged. Use a resize tool if you want to change dimensions.
The quality slider controls how aggressively the encoder discards visual information. Lower values produce smaller files with more visible artifacts, while higher values keep more detail at the cost of larger file sizes.
Yes. If you keep the output format as PNG or choose WebP, transparency is preserved. Selecting JPEG as the output will replace transparent areas with a white background since JPEG does not support alpha channels.
This can happen when converting from a highly optimized format to a less efficient one, or when using very high quality settings on an already compressed image. Try lowering the quality slider or switching to WebP output.
Currently, the tool processes one image at a time. For batch compression, you can process each image individually by uploading them one after another.
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