Image Compressor
Use this free online Image Compressor to reduce JPG, PNG and WebP file sizes by up to 80% while keeping the picture sharp enough for everyday use. It is useful for emailing photos that would otherwise hit attachment limits, speeding up a website's image-heavy pages, posting to social platforms with strict file caps, or freeing up phone storage before a backup. Drop a photo into the upload zone, slide the quality control to taste, pick a target format and download the smaller version — the original is never modified. Compression runs entirely in your browser using the HTML5 Canvas, so your photos never leave your device.
Click to choose or drag & drop an image here
Supports JPG, PNG, WEBP
How to Use This Image Compressor
Compressing an image takes one drag-and-drop and one click.
- Drop your image into the upload zone or click to choose a file.
- Slide the Quality control to balance file size against picture quality — lower means smaller.
- Pick the output format — JPEG for photos, WebP for modern web use, PNG for lossless graphics.
- Click Compress Image to process the file.
- Click Download to save the new version; the original is unchanged.
Example
A 4 MB JPEG photo from a recent iPhone, compressed at quality 75 in JPEG mode, typically lands at around 800 KB — an 80% size reduction with no perceptible loss for screen viewing. Switching the same photo to WebP at quality 80 brings it down to roughly 600 KB. For a hero image at 1920×1080, dropping to quality 60 saves another 100 KB while still looking sharp on most monitors. The original file on your device is never modified — only the new compressed copy is downloaded.
How This Image Compressor Works
Image compression reduces file size by removing visual information that the human eye is unlikely to notice. JPEG uses a lossy DCT-based algorithm that throws away high-frequency detail in 8×8 pixel blocks, which is why heavily compressed JPEGs show 'blockiness' around hard edges. WebP combines lossy and lossless modes for typically 25–35% better compression than JPEG at the same quality, and is supported by every modern browser. PNG uses lossless DEFLATE compression so the result is byte-perfect — useful for graphics, screenshots and images with sharp edges or transparency. The compressor works by drawing your image to an off-screen HTML5 Canvas at full resolution, then re-encoding the pixel buffer to your chosen format with the quality slider as the encoder hint. Quality between 75% and 85% usually halves the file size of a photograph with no perceptible loss. Smaller images can improve page loading speed, reduce bandwidth use, and create a better experience for mobile visitors. Faster pages may also support stronger Core Web Vitals and overall search visibility when combined with useful content, clear structure, and good technical SEO.
Last updated: May 2026.
Frequently Asked Questions
What's the best quality setting?
For most photos, 75–85% gives a great balance. Drop to 60–70% for thumbnails. Keep 90+ only for hero images or print.
Should I use JPEG or WebP?
WebP files are typically 25–35% smaller than JPEG at the same visual quality and supported by all modern browsers. Use WebP unless you need maximum compatibility.
Does this tool upload my images?
No — compression runs entirely in your browser using a Canvas. Your photos never leave your device.
Why is my PNG getting bigger after compression?
PNG is lossless, so compressing already-optimised PNGs may not shrink them. Try WebP-lossless or convert to JPEG if the image is photographic.
Can I batch-compress multiple images?
This tool handles one at a time. For batch work, run each image individually or use a desktop tool like ImageOptim.