Compress JPG, PNG, and WebP images locally without losing quality. No server uploads. Perfect for users needing a upscale dpi.
Upload your image (JPG, PNG, or WebP).
Adjust the compression quality slider to balance size and clarity.
View the real-time preview of file size savings.
Click "Proceed to Download" to save your optimized image.
No — all compression happens in your browser using the Canvas API. Your photos never leave your device.
At quality 80–90% (recommended range), the visual difference is undetectable to the human eye. Below 60% quality, compression artifacts become visible — especially around text and sharp edges.
80–85% for product photos and blog images — good balance. 70% for thumbnails and previews where smaller size matters more. 90%+ for images where sharpness is critical (e.g. portfolio work).
PNG uses lossless compression, so quality sliders have limited effect. Converting a PNG to WebP or JPG (if transparency is not needed) typically achieves 60–80% smaller file sizes.
JPG = lossy, great for photos. PNG = lossless, required for images with transparency. WebP = both lossy and lossless support, typically 25–35% smaller than JPG/PNG at equivalent quality — best for web.
Currently one image at a time. For batch compression of many files, use a command-line tool like ImageMagick or Sharp (Node.js).
A 6MB photo from your phone camera doesn't need to be 6MB in an email attachment, a web upload, or an app interface. Most of that size is detail the human eye can't distinguish at typical viewsizes.
This tool compresses JPG, PNG, and WebP images in your browser using adjustable quality settings. You see the before and after file size — and the compressed image — before you download anything. No upload, no account, no server involved.
Lossy compression (JPEG, WebP): Permanently reduces image data by simplifying color information in areas where the human visual system is least sensitive — typically in smooth gradients and uniform areas. A quality setting of 75–85% typically removes 50–70% of the file size while producing a result that looks identical at normal viewing sizes.
Lossless compression (PNG): Removes metadata, duplicate chunks, and unused color palette entries without changing any pixel values. The output is mathematically identical to the input. Size reduction is smaller (10–40%) but no data is discarded.
The tool uses the HTML5 Canvas API to redraw your image at the specified quality setting and export it in your chosen format — all inside your browser.
| Quality | File Size Reduction | Visual Result |
|---|---|---|
| 90–100% | 20–40% | Near-lossless — imperceptible changes |
| 75–85% | 50–65% | Sweet spot — professional output |
| 60–74% | 65–75% | Visible on close inspection at full zoom |
| 40–59% | 75–85% | Noticeable softness in detailed areas |
| Below 40% | 80–90%+ | Clear artifacts, color banding |
For most uses — website images, email attachments, social media — 75–85% quality is the right range. Go lower only when you have a hard size limit and quality is secondary.
JPEG: Best for photographs, portraits, landscapes, and any image with smooth gradients. Compression is very efficient. Not suitable for images needing transparency or sharp text.
PNG: Best for screenshots, diagrams, logos, and images with text. Sharp edges and flat colors compress better in PNG. Supports transparency (alpha channel). Compressing a PNG doesn't make it lossy — lossless optimization only.
WebP: Google's modern format supports both lossy and lossless modes. At the same visual quality, WebP files are 25–35% smaller than equivalent JPEG files. Use WebP for web-optimized images where browser compatibility is confirmed.
| Use Case | Recommended Format |
|---|---|
| Photos, product shots | JPEG or WebP |
| Logos, icons, illustrations | PNG or WebP (lossless) |
| Website hero images | WebP |
| Email attachments | JPEG (widely supported) |
| Transparent backgrounds | PNG or WebP |
Email attachments: Most email systems limit attachments to 10–25MB. A batch of high-resolution photos compresses to a fraction of the original size, fitting easily within attachment limits.
Website performance: Unoptimized images are the most common cause of slow page loads. Google's Core Web Vitals score (which affects SEO ranking) penalizes pages with large unoptimized images. Compress before uploading to your CMS or image CDN.
Document and form submissions: Many government, visa, and university portals impose file size limits (often 1–2MB per image). Compress scanned documents to meet these requirements without re-scanning.
App and social media uploads: Instagram, LinkedIn, and WhatsApp recompress images on upload — often making them look worse than if you had compressed them to the right size first.
Start with the highest quality source file you have. Compressing an already-compressed image ("double compression") stacks artifacts on top of artifacts. Always compress from the original.
Test at your target dimensions before compressing for web. If an image will display at 800px wide on your website, resize it to 800px first with the Image Resizer before compressing. Compressing a 4000px image down to 75% quality still leaves a 4000px image — just with lower quality and still too large for the web slot.
Compare before and after at 100% zoom. The side-by-side preview shows both files at the same scale — zoom to 100% to evaluate compression quality before downloading.
Don't compress screenshots below 80%. Text in screenshots has sharp edges that JPEG compression degrades visibly. Keep screenshots at 80–90% quality or use PNG for lossless screenshots.
Lossy compression is permanent. Once you download the compressed file and discard the original, the removed data is gone. Always retain your original uncompressed image.
PNG compression reduction is modest. PNG's lossless nature means the savings are smaller than JPEG compression. If PNG files need to be dramatically smaller, consider converting to WebP.
Very large images (4000px+) may be slow to process. The Canvas API renders the full image in browser memory before compressing. On lower-powered devices, processing a 20MP image may take several seconds.
Canvas-based compression differs slightly from professional tools. Tools like Adobe Photoshop's "Save for Web" or ImageMagick use more sophisticated quantization algorithms. For professional image production workflows, desktop tools may produce better quality-per-byte ratios.
Recommended schema: SoftwareApplication + FAQPage
To help users find exactly what they are looking for, this tool is also optimized for searches like: upscale dpi, change photo dpi.
Your data never leaves this device. All processing is handled locally by JavaScript.
Reduce photo and graphics size instantly. 100% processing in your browser.
Supports JPG, PNG, WEBP — files are never uploaded to our servers
