Image Compressor

Reduce image file size in the browser by adjusting quality and max size.

Category: Image Tools

When to use?

Use it to make images for upload-limited boards, email attachments, or web performance optimization.

How to use

  • Select an image.
  • Set the quality and max edge length.
  • Check the compressed result and reduction rate.

Input Explanation

Enter a quality value between 1 and 100 and the max edge length in pixels to limit the original size.

Calculation Basis

It re-renders the image via the Canvas API and encodes it as JPEG or WebP with the quality mapped to a 0.01–1.0 range.

Usage Examples

  • Optimize web images - Re-encode to JPG or WebP to reduce size.
  • Prepare images for upload - Preview the result, then tidy images for blogs, shops, or social media.
  • Compare results - Check original and result side by side for quality and size.

Examples

  • A 5MB photo at quality 70, max 1920px → about 300KB (94% smaller)
  • Quality 60, max 1280px → greatly reduced for blog upload

Cautions

  • Large originals can use a lot of device memory and CPU.
  • Extremely high-resolution large files may fail to convert due to browser image-decoding limits.

FAQ

What quality value is good?

Typical web images balance well between 70 and 85.

Is the photo uploaded to a server?

No. Compression happens only in the browser and the photo is not sent out.

Does compression drop quality a lot?

At quality 70–85, size drops a lot with little visible loss. Lower values reduce both size and quality.

Which format compresses best?

JPG for colorful photos, WebP for simple graphics. Quality 0.7–0.8 balances quality and size.

Related Tools

  • Image Resizer - Resize multiple images in the browser with aspect ratio kept, no server upload.
  • Image Format Converter - Convert PNG, JPG, and WebP images to each other in the browser.
  • Image Metadata Remover - Make a new image with original metadata like EXIF removed via Canvas re-encoding.
  • File Size Converter - Convert Byte, KB, MB, GB, TB file size units on a 1000 or 1024 basis.
  • Image Cropper - Enter pixel coordinates to crop just the area you need, in the browser.
  • Image Rotate / Flip - Rotate images in 90-degree steps or flip them horizontally/vertically.