Image Compressor

Image compression is not just a button that makes a file smaller. It is a tradeoff between byte size, visible quality, dimensions, transparency, browser compatibility, and downstream loading speed. A useful compressor page helps you control that tradeoff instead of hiding it.

The three levers you are actually adjusting

In practical browser-side compression, almost every result comes from some combination of output format, quality, and dimensions. Once you understand those three levers, the rest of the workflow becomes much easier to judge.

• Format controls the general encoding strategy, transparency support, and compatibility profile.
• Quality controls how aggressively the encoder throws away visual information.
• Scale controls how many pixels remain in the exported image, which often has the biggest size impact of all.

A safe workflow for tuning one image

The fastest way to make a good compression decision is to start with one representative image instead of trying a batch blindly. Tune format first, then quality, then dimensions, and compare before and after at each step.

1. Keep the original size first and compare JPG, PNG, and WebP behavior.
2. Lower quality gradually instead of jumping straight to an extreme value.
3. Resize only after you know format and quality alone are not enough.

Image Compressor Example

A typical workflow starts with one representative image so you can tune the output format, compression strength, and scale before processing a larger batch.

Sample input

Upload hero-banner.png, choose WebP output, set compression quality to 0.68, and scale to 80%.

Expected output

Preview the compressed image, compare the before/after size, then download hero-banner-compressed.webp.

A practical compression recipe

Input: hero-banner.png (large marketing image)
Step 1: Export as WebP at original dimensions
Step 2: Lower quality to 0.68
Step 3: If still too large, reduce scale to 80%
Review: Compare text clarity, gradient smoothness, and edge detail before downloading

Common mistakes that create bad-looking output

Most bad results come from using the wrong format for the source image, shrinking dimensions before checking quality, or exporting transparent assets to JPG. Compression problems are usually easier to prevent than to fix after a whole batch is processed.

Choosing the right export format

Practical Notes

• If you export to JPG, transparent areas will be flattened onto a white background.
• GIF input is accepted, but the exported result is a static JPG, PNG, or WebP image rather than an animated GIF.
• When the result will be used in production, keep the original file so you can re-export with different settings if needed.

Output Format And Compression Settings

Output format affects transparency, compatibility, and final file size, while compression strength and scaling determine how aggressively the image is reduced.

• JPG is suitable for photo-like material where smaller files matter more than transparency.
• PNG is better for UI screenshots, icons, or illustrations that need crisp edges or transparency.
• WebP is a good default when you want a balance between modern browser support and aggressive size reduction.

References

• MDN: Image file type and format guide
• MDN: CanvasRenderingContext2D.drawImage()
• Google Developers: WebP