Compress JPG, PNG, and WebP images to reduce file size without noticeable quality loss. Ideal for web, social media, and faster loading.
Large images slow down websites and get rejected by upload forms and email attachment limits. This tool re-encodes your image at an adjustable quality level (30-100%, default 70%) and shows a live before/after preview with the size reduction, so you can see the result before downloading.
In a real test using the tool's own compression code, an 800x800 photo-style JPG went from about 290 KB to about 83 KB at the default 70% setting - a 72% reduction; results vary significantly by image content and how compressed the source already is. The compression runs entirely in your browser, and metadata such as GPS location isn't preserved in the output either way.
This tool compresses a single image using an adjustable quality slider. Uploading a PNG keeps the output as PNG; uploading anything else - including JPG and WebP - produces a JPEG. The quality slider itself only affects JPEG output: PNG re-encoding is lossless in the browser, so the slider has no effect on a PNG's file size.
Upload JPG, PNG, or WebP image you want to compress.
Choose compression level to balance size and quality.
Image is optimized and compressed instantly in your browser.
Compare original and compressed image quality.
Download the compressed image file.
Compress a JPG or WebP photo before attaching it to an email or uploading it to a form with a size limit.
Convert a PNG to JPG or WebP first if you need a genuinely smaller file - the slider has no effect on PNG.
Use the live Original/Compressed preview to confirm quality looks right before committing to the download.
Use the Image Resizer first if the image's pixel dimensions are larger than you actually need.
This page compresses one image at a time - use the Bulk Image Compressor for a batch.
Best For
Source File
photo.jpg - 800x800, about 290 KBResult
photo_compressed.jpg - about 83 KB (about 72% smaller) at the default 70% qualityMeasured directly using the tool's own compression code. Savings vary a lot by image content and how compressed the source already is - an already-compressed JPEG will show a much smaller reduction than this fairly detailed test image.
Compress a JPG or WebP photo before attaching or uploading it somewhere with a file-size limit.
Use the live before/after preview to confirm the compressed version still looks acceptable before downloading and using it.
Since the slider doesn't shrink PNG files, convert to JPG or WebP first with PNG to JPG or PNG to WebP, then compress the result here if needed.
Problem
Solution
Tested directly: moving the quality slider from 30% to 100% produces byte-identical PNG output. PNG re-encoding is lossless in the browser, so the slider only affects JPG, WebP, and other non-PNG uploads. Convert the PNG to JPG or WebP first if you need it smaller.
Problem
Solution
Only PNG uploads stay PNG - everything else, including WebP, is compressed out as JPEG. The downloaded filename keeps your original extension (like .webp), but the file's actual content is JPEG - rename the extension to .jpg if an app has trouble opening it.
Problem
Solution
Re-compressing a JPEG that's already been through lossy compression yields much smaller gains than compressing a fresh, high-quality source - there's less redundant data left to remove.
Problem
Solution
The side-by-side Original/Compressed preview and percentage reduction appear before you download - check them to confirm the result looks right at your chosen quality setting.
Since the quality slider doesn't affect PNG output at all, switching format with PNG to JPG or PNG to WebP is the only way to meaningfully shrink a PNG here.
Pixel dimensions affect file size more than quality does in many cases - use the Image Resizer first if the image is much bigger than its intended use.
The default 70% is a reasonable web setting. Raise it toward 90-100% when preserving detail matters more than file size.
A WebP upload downloads with a filename ending in .webp, but the actual content is JPEG - renaming the extension to .jpg resolves compatibility issues in apps that check the extension strictly.
Verified directly: PNG output is byte-identical regardless of slider position, since PNG re-encoding is lossless in the browser's canvas API.
Uploading a WebP, GIF, or other non-PNG image produces a JPEG file. The downloaded filename may still show the original extension, but the file's actual content is JPEG.
EXIF data, including GPS location and camera details, is not carried over to the compressed output.
This page compresses a single image using a percentage quality slider - there's no batch processing and no option to compress to an exact file size like 200KB.
Both use a quality slider on the same underlying compression approach, but for different batch sizes.
| Image Compressor (this tool) | Bulk Image Compressor | |
|---|---|---|
| Files per run | One image, with a live before/after preview | Multiple images at once, no individual preview |
| Best for | Fine-tuning and checking a single image before download | Processing a whole batch with one shared quality setting |
Which should you use?
Use this tool when you want to see the before/after comparison and fine-tune one image. Use the Bulk Image Compressor when you have many files to process at once.
The most common surprise is that the quality slider does nothing to PNG files - PNG re-encoding is lossless in the browser, so only JPG, WebP, and other non-PNG uploads (which all compress out as JPEG) actually respond to the slider. The FAQ below covers that along with metadata and file limits.
No. PNG re-encoding is lossless in the browser - tested directly, moving the slider from 30% to 100% produces byte-identical PNG output. The slider only changes the result for JPG, WebP, and other non-PNG uploads, which all compress out as JPEG.
No. Only PNG uploads stay PNG - every other format, including WebP, is compressed out as a JPEG file. The downloaded filename may still show your original extension, but the file's actual content is JPEG.
At the default 70% setting, most photos show no obvious quality loss. Lower settings trade more visible quality for a smaller file, and re-compressing an already-compressed JPEG shows smaller savings than compressing a fresh, high-quality source.
No. The tool only offers a percentage-based quality slider (30-100%) - there's no target-file-size mode. Adjust the slider and check the live before/after sizes to approximate a target.
Yes. The compression process decodes and re-encodes the image, which does not preserve EXIF metadata such as GPS location or camera details.
No, this page handles one image at a time. Use the Bulk Image Compressor on CoditTools to compress multiple images in a single batch and download them as a ZIP.
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