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Image Tools

Image Compressor

Reduce image file size for websites, blogs, social posts, and documents. Use this image compressor to make large images lighter before uploading them to a website, CMS, email, or content platform.

Last updated: March 25, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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What is Image Compressor?

Image compression reduces the file size of photos and graphics by encoding visual data more efficiently. Lossy compression reduces file size by re-encoding photos at a selected quality level, while PNG re-encoding can reduce size by rebuilding the file without preserving metadata.

For JPEG and WebP images, the quality slider controls compression level. For PNG images, the browser re-encodes the image through Canvas while preserving dimensions and transparency. All processing runs entirely in your browser using the HTML Canvas API, so your photos are never uploaded to any server.

How to Use Image Compressor

1

Click "Upload" or drag and drop an image (JPEG, PNG, or WebP) onto the tool

2

Use the quality slider to control compression level (80% is the recommended default)

3

Choose whether to keep the original output format or convert to JPEG or WebP

4

Review the before/after file size and quality preview side by side

5

Click "Download" to save the compressed image to your device

Common Use Cases

  • Reduce blog hero image size before publishing.
  • Compress product screenshots for faster loading.
  • Prepare images for social sharing.
  • Lower page weight before Core Web Vitals testing.
  • Create smaller assets for email newsletters.
  • Optimize images before uploading to WordPress.

Example Input and Output

A typical web image can become much lighter while staying suitable for normal website viewing sizes.

Original image
Original image: blog-hero.png
Original size: 1.2 MB
Format: PNG
Use case: blog hero image
Compressed result
Compressed image size: 420 KB
Reduction: around 65%
Visual result: suitable for web use with no obvious quality loss at normal viewing size

How This Tool Works

The tool draws the uploaded image onto an off-screen HTML Canvas element using the CanvasRenderingContext2D API. To compress, it calls canvas.toBlob() with the target MIME type (image/jpeg or image/webp) and the quality parameter (0–1). The browser's built-in codec applies compression at the hardware-accelerated level. For PNG lossless mode, it re-encodes with stripped EXIF by drawing the image through Canvas without preserving metadata. The resulting Blob is then offered as a download via a temporary Object URL.

Technical Stack

HTML Canvas APIcanvas.toBlob()FileReader APIClient-side onlyNo external libraries

Privacy First

All compression happens locally using the HTML Canvas API. Your photos never leave your browser — they are not sent to, stored by, or seen by our servers at any point.

Image Compression Tips

Resize oversized images before compression, keep original files for future editing, check visual quality after compression, and avoid heavy compression for screenshots or images that contain small text.

Finish at the platform size

Choose a sourced social-media canvas before compressing so you do not optimize pixels that will later be cropped or discarded.

PNG vs JPEG

PNG is best for screenshots, logos, transparency, and images with small text. JPEG and WebP are better for photographs and large web hero images where controlled lossy compression can save much more file size.

Frequently Asked Questions

What does an image compressor do?

An image compressor reduces file size so images load faster and are easier to upload, share, or publish. It keeps the same pixel dimensions unless you separately resize the image.

What quality setting should I use?

For web images, 75–85% is the sweet spot — you get 50–70% file size savings with no visible quality loss to the human eye. Below 60% you may notice blurriness in fine details like text edges or hair. For print-quality images, stay above 90%.

What is the difference between lossy and lossless compression?

Lossy compression such as JPEG or WebP can reduce file size significantly by re-encoding visual data at a selected quality level. PNG output is better for logos, screenshots, transparency, and images with small text, but it may not shrink as much as JPEG or WebP.

Will compressing my image reduce its dimensions (resolution)?

No. This tool only changes file size, not pixel dimensions. A 2400×1600 image stays 2400×1600 after compression. If you also need to resize, use our Image Resizer tool first, then compress.

Is there a file size limit?

There is no server-side limit since compression runs entirely in your browser. However, very large images (20MB+) may be slow to process depending on your device's CPU. For batch processing of many large images, a desktop app like Squoosh CLI or ImageMagick is more efficient.

Should I resize or compress first?

Resize first if the image dimensions are much larger than the place where it will be displayed. Then compress the resized image. Reducing dimensions first usually saves more file size than compression alone.

Can I compress images for WordPress?

Yes. Compressing blog hero images, product screenshots, and content graphics before uploading to WordPress can reduce page weight and make pages load faster.

Can image compression improve page speed?

Yes. Smaller image files can improve load time and Core Web Vitals, especially for large hero images or pages with many screenshots. Compression is only one part of image optimization, but it is usually a high-impact first step.

Does compression remove EXIF data (GPS, camera info)?

Yes. By default, this tool strips EXIF metadata (camera model, GPS coordinates, timestamps, copyright). This is intentional — EXIF data can add 10–100KB and is usually unnecessary on the web. It also removes privacy-sensitive GPS data before you share photos online.

Should I use WebP format instead of JPEG?

WebP typically achieves 25–35% smaller sizes than JPEG at equivalent quality and is now supported by all modern browsers (Chrome, Firefox, Safari 14+, Edge). If your site targets modern browsers, converting to WebP during compression is the best optimization available. Use our Image Converter tool to convert format, then compress here.

Which image format is best for websites?

WebP is usually a strong default for modern websites. JPEG is still useful for photos, PNG is best for screenshots or transparency, and SVG is best for simple vector graphics such as icons and logos.

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