Compress Image
Smartly compress JPG, PNG, or WEBP images without obvious quality loss.
- Browser-only
- No upload
- No login
- No watermark
- Clear instantly
- Open-source engines
Heads upQuality is balanced against file size. Already-optimised images may not shrink further.
Drop files here
or use the buttons below · .jpg, .jpeg, .png, .webp
Your file stays on this device · conversion runs locally in your browser
Deep dive
What is Compress Image?
Image compression reduces file size while keeping the image visually similar to the original. Smaller images upload faster, load faster on websites, and take up less storage — without the visible quality loss of resizing.
FormatSwitch compresses JPG, PNG, and WEBP files locally with the browser-image-compression library. Because everything runs on your device, you can safely compress private photos, screenshots, or work-in-progress designs.
When to use it
- Shrink photos for email attachments or web upload forms.
- Reduce image size before adding to a blog post or product page.
- Free up phone or laptop storage without losing photos.
- Prepare screenshots for bug reports and support tickets.
How to use it safely without uploading
Drop your images, pick a preset — Small, Balanced, or High — and press Compress. The tool re-encodes each image locally and shows you the size reduction before you download.
Browser-based vs server-based conversion
Most online converters upload your files to their servers, process them there, and then let you download the result. That means your file exists on someone else's computer, often in logs and backups, sometimes indefinitely. FormatSwitch is different: every conversion runs on your device using WebAssembly and the browser's built-in Canvas and PDF engines. Your file never leaves your computer, so there is nothing to leak, nothing to subpoena, and nothing to trust us on — the code that does the work is running right in your tab.
FAQ
Compress Image — questions people ask
- Can I compress images without upload?
- No. Files are processed entirely in your browser using WebAssembly and the Canvas API. Nothing is uploaded to a server, and no copy is kept once you close or refresh the tab.
- Which formats are supported?
- JPG, PNG, and WEBP. Each keeps its original format after compression.
- Will the images look worse?
- The Balanced preset is nearly indistinguishable from the original for most photos. Use High if you need maximum fidelity.
- Is there a watermark?
- Never. FormatSwitch adds no watermark, logo, or quality cap to your output — the file you download is only what your browser produced.
- Does it work on mobile?
- Yes. Every tool runs on modern iOS Safari and Android Chrome. Very large files may be slower on mobile because of tighter memory limits.
- Are my images stored anywhere?
- No. Files live only in your browser's memory (JavaScript heap). They disappear when you clear the queue, refresh, or close the tab. There is no server, no database, no log.