PureTools
Image Compressor
Reduce one JPG, PNG or WEBP image directly in your browser. Adjustable quality, resize control, live preview, works offline. No watermark added.
How to use the Image Compressor
- Drag one image onto the drop zone, or click to browse from your device.
- Choose a quality between 10 and 100 percent. 80 percent is a great default for photographs.
- Optionally pick a different output format. WEBP usually offers the best size to quality ratio.
- Optionally resize to a percentage of the original. Reducing dimensions has the biggest impact on file weight.
- Click Compress image, compare original and compressed sizes, then download the result.
Why compress images?
Images are the heaviest assets on a typical web page. Studies by Google show that pages weighing over 2 MB are 50 percent more likely to be abandoned. Aggressive image compression therefore directly improves your SEO ranking, conversion rate and Core Web Vitals score (LCP in particular).
Beyond websites, smaller files make sharing by email, messaging apps and social media faster while staying within attachment limits. They also use less of your phone storage and mobile data.
Best format for the job
- JPG / JPEG, photos and complex artwork. Lossy compression, no transparency.
- PNG, screenshots, logos, transparent assets. Lossless but bigger files.
- WEBP, modern replacement for JPG and PNG, supported by all current browsers. 25 to 35 percent smaller than JPG at equivalent quality.
Quality settings that usually work
For photos, start around 80 percent quality and compare the preview before downloading. If the image is still too large, reduce the pixel dimensions before lowering quality further, because resizing usually saves more space with fewer visible artifacts. For screenshots, UI mockups and images with text, keep PNG or WEBP and avoid aggressive JPG compression, which can make edges blurry. The goal is a file that is small enough to share while still looking correct at its final display size.
Before you compress
Think about where the image will appear. A full-width website hero, an email attachment and a small profile picture do not need the same dimensions. Cropping empty space first, then resizing to the real display size, often produces a better result than quality reduction alone. Compression should be the final pass after the image already has the right composition and pixel size.
If you are preparing several versions for a website, export one image at the largest display size you actually use, then test it on a real phone screen before publishing. That catches soft text, overly aggressive quality settings and file names that no longer describe the image.
How lossy and lossless compression differ
Lossless compression, used by PNG, reduces file size without discarding any pixel data. The decompressed image is a perfect match for the original. Lossless methods work well for screenshots, diagrams and images with large areas of identical color, but they cannot achieve the dramatic size reductions that lossy formats offer on photographic content.
Lossy compression, used by JPG and WEBP in their standard modes, permanently removes fine detail that the human eye is unlikely to notice at normal viewing distances. The encoder decides which details to discard based on the quality setting: high quality keeps most of the original data, low quality removes more. The benefit is file sizes several times smaller than lossless output for the same image.
The right choice depends on the content. Photos and gradients compress well with lossy formats at quality 75 to 85, producing files that look identical to the original at normal screen sizes. Screenshots, text, icons and images with sharp edges compress better with lossless PNG or high-quality WEBP, because lossy encoding tends to blur precise lines and introduce color bands around text. When you need to rotate or crop an image before compressing it, use the Image Rotator first, then compress the result here.
Frequently asked questions
Is the image really compressed in my browser?
Yes. Compression runs entirely in your browser. Your image is never uploaded, logged or sent to PureTools servers. All temporary data is automatically cleared when you remove the image or close the page. The original file is decoded, resized if needed, and re-encoded locally, then the result is offered as a Blob download without creating an account or server-side job. Your data is never used to train AI models or improve machine learning systems.
How much can I shrink an image?
It depends on the original format, dimensions and image content. Photos exported as JPG or WEBP often shrink by 50 to 80 percent at quality 80 with little visible change. PNG screenshots and logos may compress less unless you resize them or convert to WEBP. The preview shows original size, output size and savings before download. To reduce pixel dimensions before compressing, try the Image Resizer.
Does the tool work on transparent PNG images?
Yes. Transparency is preserved when the output format is PNG or WEBP, because both formats support alpha channels. If you choose JPG, transparent pixels are filled before export because JPEG cannot store transparency. For logos, icons, UI screenshots or cutouts, keep PNG or WEBP selected to preserve clean edges and transparent backgrounds. For pure CSS gradient backgrounds that need no image at all, try the CSS Gradient Generator.
Why does the compressor use one image at a time?
A single-image workflow is easier to understand on mobile and avoids accidentally compressing multiple images with the wrong quality or size settings. It also keeps memory usage low, especially on phones with high-resolution photos. When you finish one file, clear it and add the next, everything stays private throughout. This keeps memory use predictable on phones and avoids confusing batch downloads where users cannot easily inspect each result before saving it.
Does this tool add a watermark to compressed images?
No. The compressed file you download is completely clean, no watermark, no logo, no branding overlay of any kind. The only difference from the original is the reduced file size and, optionally, a different output format or smaller dimensions. This tool is always free and watermark-free, with no account or upgrade required.
Are camera info and GPS location preserved?
No. The compression process removes hidden metadata from the image, such as the camera model, timestamp and GPS location. This is actually useful for privacy when sharing images online, because your location data is not included in the compressed file. If you need to keep that information for archival purposes, use a dedicated desktop tool instead.
Can I compress screenshots and images that contain text?
Yes, but the format and quality setting matter. JPG compression introduces blocky artifacts around sharp edges, which makes text look blurry or fringed at high compression ratios. For screenshots, UI mockups, code snippets and any image where readable text is important, choose PNG or WEBP as the output format. WEBP at quality 80 or higher keeps text crisp while still producing a significantly smaller file than PNG. If the screenshot contains mostly flat color with minimal photographic content, PNG lossless compression often achieves a good size reduction without any quality compromise at all.