Image compressor: help & limits

Make an image easier to attach, publish, or share. Choose a file to get an automatic result at its original dimensions. Open Adjust compression if you want to change quality or output format. There is no promised compression percentage: a detailed photograph behaves differently from a flat illustration, and an already efficient image can grow.

How to use

1. Choose a supported still image. Compression starts automatically.
2. Compare the original and result. If needed, open Adjust compression to change quality or format; the result updates automatically.
3. Check text, faces, and edges in the result. Download when the size and appearance suit your task.

Supported files

JPG, PNG, WebP, AVIF, HEIC, BMP, still GIF · 64 MiB · 64 megapixels. One image at a time. Maximum 16,384 pixels per edge and 128 MiB output.

How it works

Reqly keeps the original dimensions and encodes at quality 85 by default. JPEG input stays JPEG; Other supported inputs become WebP to retain transparency. You can change the quality or format under Adjust compression. Quality is an encoder hint, not a percentage of original detail. Actual bytes are measured after encoding. JPEG fills transparent areas with white; WebP can retain transparency.

Examples

Limitations

• No exact target file size or guaranteed reduction. Lower quality may introduce visible artifacts.
• PNG input is converted to JPEG or WebP; this is not a lossless PNG optimizer. JPEG cannot retain transparency.
• Animations are rejected. Re-encoding may change metadata, color profiles, and subtle colors. Browser encoders differ.
• Large images may fail below the limits on low-memory devices. A worker is stopped after 60 seconds.

Privacy

Quality comparisons and compressed copies are created in a worker on your device. The selected image, its name, and its contents are not sent to Reqly or to a compression service.

Common questions