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Image Compressor

Reduce image file sizes by up to 90% while keeping them looking sharp. Process many images at once, compare savings, and download everything as a ZIP.

  • Runs in your browser
  • Free, no sign-up
  • No uploads
75%

Tip: PNG is lossless — choose WebP or JPG for big savings on photos.

Drop images here or click to browse

PNG, JPG, WebP, GIF, AVIF, BMP · Paste from clipboard · Batch supported

The Ultimate Guide to Image Compression

When building a website, sharing photos online, or trying to send an email with attachments, you have likely run into file size limits. A single high-resolution photo from a modern smartphone can be 10MB or larger. If you upload that to a website, it will take seconds to load and drain mobile data plans.

Image compression is the process of reducing the file size of a graphic without significantly degrading the visual quality. This is achieved through clever mathematical algorithms that remove invisible details or consolidate redundant color blocks.

Lossy vs. Lossless Compression

When compressing images, you will typically choose between two methods:

  • Lossy Compression: This method permanently removes some visual information to achieve massive reductions in file size. It is perfect for JPEGs and WebP images. Most users will not notice the difference between a 100% quality JPEG and an 80% quality JPEG, but the file size will be cut in half.
  • Lossless Compression: This method compresses the data without throwing away a single pixel of information. It is ideal for PNGs, logos, and text-heavy graphics where sharp edges are mandatory. The file size reduction is less dramatic, but the quality remains perfect.

Why You Should Compress Images Locally

Most online image compressors require you to upload your personal photos to their cloud servers. This means they have a copy of your images, which is a massive privacy risk for sensitive documents or private family photos.

Our tool runs 100% locally in your browser. The complex compression algorithms run on your own CPU. Because your files never leave your device, there is absolutely zero risk of your images being stolen, stored, or leaked.

How to Optimize Images for the Web

If you are a web developer, image optimization is critical for SEO. Google actively penalizes slow-loading websites. To optimize your site:

  1. Resize your images so they are no larger than the maximum display size (e.g., don't serve a 4K image for a 300px thumbnail).
  2. Use our Image Compressor to reduce the quality to around 75-80%.
  3. Convert your JPEGs and PNGs into modern WebP formats for maximum performance.

How to use the Image Compressor

  1. 1

    Drop one or more images onto the upload area.

  2. 2

    Adjust the quality, output format and optional max width.

  3. 3

    Download individual images or all of them as a ZIP.

Features

Bulk compression
Compress dozens of images in one go.
Quality control
Fine-tune the quality-to-size trade-off with a slider.
Format switching
Convert to WebP for the biggest savings.
Before/after stats
See original size, new size and percentage saved.

Frequently asked questions

Why didn't my PNG get smaller?

PNG is lossless, so the quality slider has no effect. Switch the output to WebP or JPG for dramatic savings, or reduce the maximum width.

Is there a file limit?

There's no hard limit — images are processed by your device, so very large batches simply take longer.

Are my images uploaded to a server?

No. All processing happens locally in your browser using JavaScript and WebAssembly. Your images never leave your device, and nothing is stored or logged.