How to Compress Image Online for Free
Compress JPG, PNG, WebP, and GIF files individually or in bulk. Reduce image file size in 3 steps with our online image compressor. No software installation required. Free and secure.
Choose Images
Select images from your device or drag and drop them into the browser. The image compressor accepts JPG, JPEG, PNG, WebP, and GIF files.
Adjust Compression Settings
Set the quality level, keep JPG metadata when needed, or enable lossless compression for supported PNG and WebP files.
Compress and Download
Click “Compress” to start. When compression is complete, download one compressed image or save all images in a ZIP file.
How Does the CompressFly Image Compressor Work?
The CompressFly image compressor allows you to compress JPG, JPEG, PNG, WebP, and GIF images directly in your browser. Unlike other online image compressor tools, no files are sent to a server: everything is processed locally, individually or in bulk.
Each format is compressed using settings suited to that image type. Smart compression reduces image file sizes while maintaining high visual quality, making it simple to compress images for free with no signup required.
What "in your browser" means
- No image files are sent to a server
- No remote copy of your images is stored
- Compression runs locally on your device
- Compressed files are downloaded directly from your browser
Supported Image Formats
The general image compressor accepts JPG, JPEG, PNG, WebP, and GIF files. Each format uses the settings available for that format. For SVG files, use the separate Compress SVG tool.
JPG and JPEG
Compress photos with adjustable lossy quality and choose whether to keep JPG metadata.
PNG
Reduce screenshots and transparent graphics with lossy or lossless compression.
WebP
Compress WebP images with adjustable lossy quality or a lossless option.
GIF
Process GIF files here or use the dedicated GIF compressor for animation-focused optimization.
Bulk Image Compressor for 300+ Files
Process 300+ JPG, PNG, WebP, and GIF images with one set of compression settings, then download the results individually or as a ZIP file. Compress as many images as you need, with no file size limits.
Batch compression runs locally on your device. Practical capacity and processing speed depend on available memory, image dimensions, file sizes, browser, and device performance.
Reduce Image File Size While Keeping High Visual Quality
The image compressor uses smart compression to reduce file size while keeping visual quality high. Move the slider to compare the original JPG (985 KB) with the compressed version (81 KB).
Original (985 KB)
Compressed (81 KB)JPG Photo Compression
This 1024 × 575 landscape photo was compressed from 985 KB to 81 KB, a 92% reduction in file size. At normal viewing size, the compressed photo remains visually close to the original. Fine gradients in the sky and water are useful areas to inspect for subtle differences. Results vary by image content and compression settings.
Why Use CompressFly to Compress Images Online?
Smart Image Compression
Reduce image file sizes while maintaining high visual quality with smart compression for supported formats.
Local Browser Processing
Compression runs directly in your browser for fast processing, with no software installation required.
Batch Compression
Our batch image compression tool lets you compress 300+ images at once, saving time on large batches.
Before-and-After Preview
Compare images before and after compression, then review output quality and file size before downloading.
Private & Secure
Your images never leave your device. All compression happens locally in your browser, with no uploads to a server.
Free Access
Use the image compressor for free without signing up or entering credit card details.
Free Image Compressor FAQ
How do I compress images online?
Use this online image compressor to reduce image file sizes in three steps: 1. Upload or drag and drop your images into the browser. The images are processed locally and never uploaded to a server. 2. Adjust the compression settings if needed, then click “Compress.” 3. Download a compressed image individually or save all compressed images in a ZIP file.
What image formats can I compress?
The general image compressor accepts JPG, JPEG, PNG, WebP, and GIF files. For vector graphics, use the separate SVG compressor.
Does image compression reduce image quality?
Lossy compression can remove some encoded detail to create a smaller file, so the quality setting affects the result. The lossless option can reduce supported PNG and WebP files without losing quality.
Can I compress multiple images at once?
Yes. You can process 300+ images, apply shared settings or adjust files individually, and download the results together as a ZIP file. Folder structure is preserved when available.
Is there a file size or image quantity limit?
No. There are no limits on how many images you can compress, and CompressFly does not set a maximum file size. Because compression runs in your browser, very large images or batches may take longer depending on your device.
Are my images uploaded to a server during compression?
No. Image compression runs locally in your browser, so your files remain on your device and are not uploaded to a server.
Can I adjust the compression level or target file size?
You can adjust the quality level for supported lossy formats and use lossless compression for supported PNG and WebP files. To aim for a specific output size, use the Compress Image to KB tool.
What is the difference between compressing and resizing an image?
Compression changes how image data is encoded to reduce file size, while resizing changes the pixel dimensions. Use the image resizer when you need a different width or height.
Is the image compressor free?
Yes. The image compressor is free to use. No registration or credit card is required, and there are no daily limits or watermarks.