Image Compressor

No. All processing happens inside your browser using the Canvas API. The image is never uploaded to any server. This makes the tool completely private and it works offline once the page is loaded.

Yes. The Canvas API decodes your image to raw pixel data and re-encodes it to the output format. In this process, all metadata including EXIF, GPS coordinates, and camera model tags is discarded. This is a useful privacy benefit when sharing images publicly. If you need to preserve copyright or creation-date metadata, keep a copy of the original file.

JPEG, PNG, WebP, and GIF (first frame only) are accepted as input. The output can be JPEG, WebP, or AVIF. All three output formats support lossy quality control. PNG output is always lossless and produces larger files, so it is not offered as a compression output. If you upload a PNG with transparency and need to preserve it, use WebP output at 80% quality or higher.

For web images such as thumbnails, blog photos, and product images, 70 to 80% JPEG quality is typically indistinguishable from the original at normal viewing distances. For hero banners examined closely, use 85%. For archiving or sharing, 90% or above. Below 60% you will see visible artefacts in smooth gradients. WebP achieves better quality at the same file size as JPEG, and AVIF goes further still: 65% AVIF is roughly equivalent to 80% JPEG in perceived quality.

AVIF (AV1 Image Format) is a next-generation format that typically produces files 20 to 50% smaller than WebP at the same visual quality. All modern browsers including Chrome, Safari, Firefox, and Edge have supported it since 2021. Use AVIF when optimising images for web delivery and your audience uses modern browsers. JPEG remains the safest choice for email attachments or images shared via older applications.

For email attachments, JPEG at 70 to 75% typically reduces a 5 MB photo to under 500 KB while remaining sharp at inbox preview sizes. For WhatsApp or Messenger, JPEG is the safest format as some messaging apps re-encode WebP. For web sharing on Twitter, LinkedIn, or Instagram, WebP at 70% gives smaller files with better quality. Resize the image to the platform's recommended dimensions before compressing for the biggest savings.

This happens when the original image was already heavily compressed. Re-encoding it re-applies compression to an already-lossy source, which can inflate the file after the canvas decodes it to a raw bitmap and re-encodes it. Try lowering the quality slider. Also, PNGs with minimal colour depth such as logos are often more efficiently stored as PNG than re-encoded as JPEG.

There is no hard limit. The constraint is your device's available RAM. A 20 MP DSLR JPEG (5 to 8 MB file) decodes to roughly 60 MB in memory as a raw bitmap. Most modern phones and laptops handle this easily. Very large panoramas above 100 MP may cause the tab to run out of memory. Split them first if that happens.

Not yet. The tool processes one image at a time. Drag in the next image when you are done with the current one and the tool resets automatically.