Compress JPG, PNG, GIF and WebP images with a target size, quality, output format and optional resize settings. Check what changes before you download.
An image can look perfectly ordinary and still be far too heavy for an upload field, product page, email attachment, or messaging app. The useful question is not simply whether it can be made smaller; it is which compromise is acceptable for this particular file. This Image Compressor lets you set a target size, select an output format, adjust quality, and optionally allow smaller dimensions. It then evaluates available encodes and returns the smallest suitable result it can make rather than treating every image type the same way.
Start with a copy of the original, especially if the file is a design asset, a document scan, or a photograph you may print later. A smaller download can be useful for publishing or sharing, but compression cannot add back detail that has already been discarded. After downloading, open the result at its intended size and compare sharp text, faces, gradients, thin lines, and transparent edges before replacing the source file.
For a photograph, lowering the quality of a JPG or WebP often reduces size more effectively than changing its dimensions. Quality changes affect how much visual detail the encoder retains; modest reductions may be hard to notice at normal viewing size, while an aggressive setting can create blockiness in skies, skin, or dark gradients. A product photo headed for a small card can usually tolerate more reduction than a portfolio image viewed full width.
Dimensions are a separate decision. A 4,000-pixel image placed in an 800-pixel web slot carries pixels the visitor will never see. If the receiving platform specifies a maximum width or height, use that as the starting point. When no resize is selected, the compressor keeps the source dimensions and concentrates on encoding. That distinction helps when a form checks pixels as well as kilobytes.
JPG is normally a practical destination for opaque photographs because it trades some data for a smaller file. PNG is better suited to diagrams, screenshots, text-heavy graphics, and assets that need transparent pixels, but a full-colour PNG is not automatically small. WebP can be a useful alternative where the receiving website or application accepts it, particularly for web delivery. Do not select a format just because it is fashionable; select the one that the next system actually accepts.
Transparency needs special attention. A JPG cannot retain an alpha channel, so a transparent logo or sticker needs PNG or WebP if its background must remain transparent. GIF input also deserves care: a general image re-encode is appropriate for a still frame or thumbnail, not a promise that an animation, frame timing, or every frame will survive. Check the output rather than assuming that a file extension preserves every property of its source.
When a portal asks for an image below a fixed limit, enter a target with a little margin rather than aiming exactly at the ceiling. A 200 KB limit, for example, is safer with a target below 200 KB because websites can calculate size differently or add their own processing. The compressor tries a range of quality and, where resizing is allowed, dimension choices to find a suitable result. A detailed image may not reach an ambitious target without visible compromise.
It also avoids returning a newly encoded file that is larger than the original when no improvement is available. That is useful information, not a fault. Already well-compressed JPGs and simple PNGs can have little redundant data left. In that situation, changing the target format, reducing dimensions deliberately, or choosing a less demanding upload requirement may be more effective than repeatedly recompressing the same file.
Inspect at 100 percent, not only in a small browser preview. Look for ringing around letters, colour banding in a smooth background, softened product labels, and halos around transparent edges. If the file is for print, compare it at the physical dimensions you plan to use; a compressed social image may look fine on a phone but weak on paper. Keep the original until the recipient, CMS, or form accepts the downloaded version.
Use ordinary, non-sensitive sample files when testing a new setting. This tool processes uploaded files on the server to prepare a download, so it is not a local-only editor. Avoid uploading IDs, medical images, confidential client work, passwords, private keys, or anything that should remain solely in a controlled system. For everyday web assets, the practical workflow is upload, set the smallest acceptable target, inspect, download, and retain the source.