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CompressNConvert

Optimize file size

Image Compressor

Reduce JPG, PNG, WebP, or AVIF file size locally and compare the result before downloading.

100% local

Drop one image here

JPG, PNG, WebP, or AVIF · up to 32 MB · adaptive 8–24 megapixel limit

Your image never leaves this browser

Private by design

Images stay in browser memory and are never uploaded by these tools.

Modern formats

Decode and export JPG, PNG, WebP, and AVIF using browser and WebAssembly codecs.

Keep your original

Re-encoding can alter metadata, animation, profiles, or quality, so verify every output.

Complete tool guide

How to compress images without unnecessary quality loss

Image compression reduces encoded file size so pictures load, transfer, and store more efficiently. This tool re-encodes the image at the selected quality while keeping its pixel dimensions.

The best setting depends on the source and destination. Photos often tolerate moderate lossy compression; graphics, screenshots, and text need closer inspection around edges and gradients.

Why use this tool?

  • Reduce page weight and upload time.
  • Fit email or form size limits.
  • Compare the exact byte reduction before downloading.
  • Keep every file private in browser memory.

Common use cases

  • Website and blog photography.
  • Product images and social assets.
  • Screenshots for documentation.
  • Lighter copies for email or messaging.

How to use it

  1. 1

    Choose a JPG, PNG, WebP, or AVIF.

  2. 2

    Set the output quality.

  3. 3

    Compress and review the preview and size comparison.

  4. 4

    Download the result while keeping the original master.

When no smaller output is possible

Some images are already optimized. If re-encoding produces a larger file, the tool keeps the original bytes so compression never makes the download bigger.

PNG quality

Browser PNG encoding is lossless and does not use a quality slider. For photographic images, consider converting to WebP or AVIF.

Practical tips for better results

  • Judge detail at the final display size.
  • Avoid repeated lossy recompression.
  • Resize oversized images before compressing.
  • Keep the best original separately.

Frequently asked questions

Does compression change dimensions?

No. Use Image Resizer when width or height also needs to change.

Are images uploaded?

No. Decoding, encoding, previewing, and download preparation happen in your browser.

Keep working

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Image ConverterConvert between JPG, PNG, WebP, and AVIF with adjustable quality.Image ResizerChange pixel width and height with optional aspect-ratio locking.Image CropperCrop to custom bounds or common aspect ratios with exact dimensions.Rotate and Flip ImageRotate in 90° steps or flip horizontally and vertically.