Compress Your Images Fast and Free
Compress JPEG, PNG, WebP and GIF formats without losing quality. Up to 20 images at once, up to 100 MB each. No sign-up required.
Start CompressingWhy FileAlter?
High-quality compression
Compresses JPEG, PNG, WebP and GIF formats while preserving quality. Reduce file size by up to 80%.
Fast, parallel processing
Up to 20 images are processed simultaneously via an asynchronous queue. Results ready in seconds.
Safe and private
Your images are automatically deleted after processing. No data is stored.
How it works
Choose JPEG, PNG, WebP or GIF images — up to 20 at once.
Adjust quality level, size and other parameters individually for each image.
Once all images are compressed, download them one by one or as a ZIP archive.
Supported formats
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Why compress your images?
Large image files slow down your website, use up storage space, and cost more in bandwidth. Compressing your images can shrink file sizes by up to 80% without a noticeable drop in visual quality, which means faster page loads, better search engine rankings, and a smoother experience for your visitors. Whether you're preparing photos for a blog, an online store, or a portfolio, optimized images help your content load quickly on every device and connection speed.
Image weight is often the single biggest factor in a page's loading time, and it directly affects Core Web Vitals metrics like Largest Contentful Paint. A lighter page loads faster on mobile networks, keeps visitors from bouncing before the content appears, and reduces the storage and transfer costs of running a website or app. FileAlter handles the technical work — resizing, recompressing, and stripping unnecessary metadata — so you get smaller files without spending time in a desktop editor.
Frequently asked questions
Is FileAlter really free to use?
Yes. FileAlter is completely free, with no hidden fees, subscriptions, or watermarks. You can compress as many images as you like without creating an account.
Will compressing my images reduce their quality?
FileAlter uses smart lossy and lossless compression to reduce file size while keeping your images looking sharp. You can fine-tune the quality level for each image, or choose lossless mode for zero quality loss.
What image formats does FileAlter support?
FileAlter supports JPEG, PNG, WebP, and GIF files. Each format is optimized with techniques suited to it, such as chroma subsampling for JPEG or transparency-safe compression for PNG.
Is there a limit on file size or number of images?
You can upload up to 20 images at a time, each up to 100 MB. If you need to process more, simply repeat the process — there's no daily limit.
Do you store or share my uploaded images?
No. Your images are processed automatically and permanently deleted from our servers afterward. We never share your files with third parties.
Do I need to install any software?
No installation is required. FileAlter runs entirely in your web browser, so it works on Windows, macOS, Linux, and mobile devices alike.