Compress images online — reduce file size, keep quality
Compress JPG, PNG, and WebP images online. Adjust quality to balance file size and visual fidelity, and see live compression savings before you download. Fast server-side compression with an automatic private browser-only fallback.
Private & Secure
Files never leave your device. All processing happens locally in your browser.
Completely Free
No subscription, no watermarks, no file limits. Free forever.
Batch Conversion
Convert dozens of files at once with individual progress tracking.
Lightning Fast
Powered by your device's hardware. No server round-trips.
What is Compress images online — reduce file size, keep quality?
Image compression is essential for optimizing website performance, reducing bandwidth costs, and improving user experience. Large, uncompressed images slow down page load times, consume data, and hurt Core Web Vitals scores. Compressing images before uploading them to your website or sharing them online ensures fast delivery without sacrificing perceived quality.
This Image Compress Tool lets you adjust compression quality with a simple slider and see the estimated file size in real time. You can compare the original and compressed sizes side by side, showing exactly how much you save. JPG, PNG, and WebP compression all use our server for the best results, with an automatic browser-only fallback if the server is unavailable. Uploaded images are deleted immediately after processing and are never stored or shared.
How to Calculate
- Upload your image by dragging and dropping or clicking to browse. Supports JPG, PNG, and WebP formats.
- Adjust the quality slider to find the perfect balance between file size and visual quality.
- Watch the live preview update with the estimated compressed file size and savings percentage.
- Compare the original and compressed sizes to confirm the compression meets your needs.
- Click Download to save your compressed image — processed on our server for the best result, with an automatic private browser-only fallback if needed.
Key Benefits
- Reduce image file sizes by up to 80% with minimal visible quality loss — ideal for web performance optimization
- Real-time file size preview shows exact savings before downloading, so you can fine-tune the quality setting
- Images sent to our server for compression are deleted immediately after processing — never stored or shared, with an automatic private browser-only fallback if the server is unavailable
- Supports JPEG, PNG, and WebP formats with quality controls tailored to each format
- Zero cost, no registration, no watermarks, and unlimited usage
- Works offline after the first page load — no internet connection needed for compression
Common Use Cases
- Web developers compressing hero images and product photos to improve page load speed and Lighthouse scores
- E-commerce sellers reducing image file sizes for faster product page loading and better conversion rates
- Social media managers optimizing images before uploading to platforms that compress images further
- Email marketers shrinking images to reduce email size and improve deliverability rates
- Photographers preparing web-ready versions of high-resolution photos for online portfolios
- Bloggers optimizing featured images and inline photos to reduce hosting bandwidth and monthly costs
Key Terms Explained
- Lossy Compression
- A compression method that reduces file size by discarding some image data. JPEG and WebP use lossy compression. Higher quality settings preserve more data, lower settings produce smaller files but may introduce visible artifacts.
- Lossless Compression
- A compression method that reduces file size without losing any image data. PNG uses lossless compression by default. In this tool, PNG stays fully lossless at quality 95+; lower settings trade some color fidelity for a smaller file via palette reduction.
Pro Tips
- Start at quality 80 and adjust down or up based on your image content — photos can go lower, text-heavy images need higher quality
- Always keep the original file — compression is destructive for lossy formats, and you cannot recover the original quality after saving
- For images with text or sharp edges, use higher quality (90+) or PNG format to avoid visible compression artifacts
- Compress images to their final display dimensions first, then apply quality compression for maximum file size reduction
- Batch process multiple images by repeating the compression — the tool resets cleanly for each new file
- For profile photos and thumbnails where small file size matters most, lower the quality to 50–60 — the small display size hides most artifacts
JPEG Compression
JPEG uses lossy compression optimized for photographs and complex images with smooth gradients. It excels at reducing file size while maintaining good visual quality at medium-to-high quality settings. At lower quality levels, JPEG introduces blocky artifacts and color banding, especially in areas with smooth gradients or solid colors. JPEG does not support transparency.
WebP Compression
WebP is a modern image format developed by Google that provides superior compression compared to JPEG. At the same quality level, WebP files are typically 25–35% smaller than JPEG. WebP supports transparency (alpha channel) and animation. It is supported by all major modern browsers but may not work in older software or legacy systems.
PNG Compression
PNG uses lossless compression by default, preserving sharp edges, text, and transparency perfectly — ideal for screenshots, logos, and graphics with text. At quality 95 and above, this tool keeps PNG fully lossless; lowering the quality reduces the color palette to shrink the file further, which can introduce visible banding on photographic content.
Frequently Asked Questions
What does image compression do?↓
Image compression reduces the file size of an image by removing or simplifying some data. Lossy compression (JPEG, WebP) discards visual information that is less noticeable to the human eye. Higher quality settings preserve more detail but produce larger files. Lower quality settings create smaller files at the cost of some visible artifacts.
What is the best quality setting?↓
For web use, a quality setting between 75 and 85 offers a good balance of file size and visual quality. For social media and email attachments, 60 to 75 works well. For archival or printing, use 95 or choose PNG for lossless output. The best setting depends on your image content — photos with lots of detail can go lower than gradients or text.
How much can I compress an image?↓
Typical JPEG images compress to 20–40% of their original size at quality 75–85. WebP often achieves 25–35% smaller files than JPEG at the same visual quality. PNG compresses losslessly at quality 95+ with more modest savings, but can shrink dramatically at lower quality settings by reducing the color palette. The actual savings depend on image content — photos compress more than diagrams or screenshots.
Is my image uploaded to a server?↓
Your image is sent to our compression server for the best quality-to-size ratio and is deleted immediately after processing. If the server is busy or unreachable, compression falls back automatically to your browser instead — you'll still get a compressed file, just using your device's own processing power.
Should I use JPEG or WebP?↓
WebP generally provides better compression than JPEG at the same quality level, making it ideal for web use where file size matters. JPEG has broader compatibility with older software and devices. Use JPEG for maximum compatibility, or WebP for smaller files with modern browser support.