How to Compress Images Online
- Choose your settings — Adjust the quality slider (80% is a great default) and pick your output format. JPG produces the smallest files, WebP offers the best quality-to-size ratio, and PNG is lossless.
- Add your images — Drag and drop JPG, PNG, or WebP files into the upload area, or click "browse files" to select them. You can add as many images as you like.
- Download — Each image compresses automatically. See the before-and-after file sizes and savings percentage. Download individually or click "Download All" for the whole batch.
Why Compress Images?
Large image files slow down websites, eat up email attachment limits, and fill your storage. A 5 MB photo from your phone can often be compressed to under 500 KB with no visible quality difference. Whether you're uploading product photos to a website, attaching images to an email, or just trying to save space, compressing your images makes them easier to share and faster to load.
Quality Settings Guide
- 85-100% — Near-original quality. Best for photography portfolios, print-ready images, and professional work. Moderate file size reduction.
- 70-85% — The sweet spot. Virtually no visible quality loss while significantly reducing file size (often 50-70% smaller). Great for websites, social media, and email.
- 50-70% — Noticeable compression on close inspection, but fine for thumbnails, previews, and web graphics. Maximum file size reduction.
- 10-50% — Heavy compression. Useful when file size is critical and quality is secondary.
JPG vs PNG vs WebP
JPG is the best choice for photographs and complex images. It uses lossy compression, meaning some data is discarded to achieve smaller files, but the visual difference is minimal at quality settings above 70%.
PNG is ideal for graphics, screenshots, logos, and images with text or sharp edges. It uses lossless compression, so quality is perfectly preserved, but file sizes are larger than JPG.
WebP is a modern format from Google that offers better compression than both JPG and PNG. It's supported by all modern browsers and is increasingly the best choice for web images.
Privacy & Security
Unlike services like TinyPNG or Compressor.io that upload your images to remote servers for processing, FilePulp compresses images entirely in your browser. Your photos and images are never sent anywhere — the compression happens on your device using the HTML5 Canvas API. You could disconnect from the internet and this tool would still work.
Frequently Asked Questions
Is this image compressor free?
Yes, completely free. No sign-up, no hidden fees, no watermarks. Compress as many images as you need with no limits.
Are my images uploaded to a server?
No. All compression happens locally in your browser using JavaScript and the HTML5 Canvas API. Your images never leave your device — we never see, store, or have access to your files. You could disconnect from the internet and this tool would still work.
Will compressing reduce my image quality?
At the default 80% quality setting, the difference is virtually invisible to the human eye while typically reducing file size by 40-70%. You can adjust the quality slider higher for near-perfect quality, or lower for maximum compression. Use the "Keep original" format option and 100% quality if you want zero quality loss (for PNG images).
What image formats are supported?
You can compress JPG, JPEG, PNG, and WebP images. You can also choose your output format: JPG (smallest files), WebP (best compression-to-quality ratio), PNG (lossless), or keep the original format.
How many images can I compress at once?
There's no limit. Select or drag and drop as many images as you want — they'll all be compressed automatically. You can download them individually or use the "Download All" button.
What's the best quality setting?
For most uses, 70-85% quality is ideal — it significantly reduces file size with virtually no visible quality loss. Use 85-95% when image quality is critical (photography portfolios, product shots). Use 50-70% when small file size matters most (email attachments, web thumbnails).