How much can compress-image reduce a photo?

Typical reductions are 50-80% for JPEG photos at 70-80% quality and 20-40% for already-optimised PNGs converted to WebP. The compression slider lets you balance size against visible artefacts in the live preview. All processing runs in your browser.

Is my image uploaded to a server?

All compression happens in your browser using the Canvas API. Our servers are not involved at any point.

Why is the compressed file sometimes larger?

This can happen with PNGs or images already well-compressed. Try switching to JPEG output for the smallest file size.

Is there a file size limit?

There is no hard limit. The tool runs in your browser memory. Very large images (over 20 MB) may be slow on older devices.

Compress Image

Image compressor is a browser-based tool that reduces JPEG, PNG, and WebP file sizes. It uses adjustable quality settings, supports format conversion, and shows original-vs-compressed size at a glance. The tool runs in your browser.

Drop an image or click to choose

JPG, PNG, or WebP, up to 50 MB. Stays in your browser.

FORMAT

QUALITY 80%

Runs entirely in your browser

Target-size tools

Need to hit a specific file size?

Compress Image to 100KB

Fits forms that cap uploads near this size

Compress Image to 200KB

Good balance between quality and size

Compress Image for Discord

Stays under Discord's 8 MB limit

Compress Image for WhatsApp

Below WhatsApp's re-compression threshold

Compress Image for Email

Optimized for email attachments

Compress Image Without Uploading

How to compress an image

Drop your image onto the page or click to browse. JPEG, PNG, and WebP are all supported.
Adjust the quality slider to balance file size against visual quality.
Click "Compress" and preview the result alongside the original size.
Download the compressed image directly.

Common uses

Reducing image size before uploading to a website or CMS, pair with a tool that scales images to a specific width to control both dimensions and file size
Shrinking photos to share by email without losing too much quality
Compressing product images to speed up e-commerce page load times, you can also convert to WebP for better compression ratios

Technical specification

Algorithm or formula: Decode the source image into an off-screen canvas, then re-encode via HTMLCanvasElement.toBlob with a quality argument (0 to 1) for JPEG and WebP. PNG re-encoding is lossless and benefits mainly from format change.
Browser API or library: Canvas 2D API and canvas.toBlob. No external library.
Input limits: Files capped at 50 MB and 50 megapixels (longest side 10,000 pixels), enforced before decoding to avoid memory exhaustion.
Output: JPEG (.jpg), PNG (.png), or WebP (.webp) blob with a download link.
Known limitations: Quality slider is JPEG/WebP only. Some PNGs may compress poorly because the source is already well-optimised. Animated images are flattened to a single frame.

Frequently asked questions

Is my image uploaded to a server?: No. Compression happens entirely in your browser using the Canvas API.
What image formats are supported?: JPEG, PNG, and WebP are supported as input. The output format matches your selection in the tool.
Why is the compressed file sometimes larger?: This can happen with PNGs or images already well-compressed. Try switching to JPEG output for the smallest file size.
Is there a file size limit?: There is no hard limit. The tool runs in your browser memory. Very large images (over 20 MB) may be slow on older devices.

Reviewed and tested May 26, 2026.