How to reduce image file size without losing the details you need

Start with the destination, not a quality percentage

An image for an email attachment, a product listing and a printed poster has different requirements. Before changing the file, find the destination’s maximum file size, accepted formats and required width and height. Save the original separately so you can start again if an export looks poor.

Pixel dimensions describe how much image information you have. File size describes how many bytes you must upload. A 1200 × 800 photo can have several different file sizes depending on its format, detail and compression. Reducing the file size does not necessarily mean changing its dimensions.

Do not upload identity documents, confidential screenshots or other sensitive files unless you are comfortable with online processing. PixaTok sends selected images to its services; it does not process the entire operation only on your device. Our privacy policy describes the processing and storage.

Remove pixels the destination will not use

If a destination needs a 1200-pixel-wide picture, a 6000-pixel-wide camera export is often unnecessary. Resize from the original using a mode that preserves proportions. Keep enough resolution for the actual display size, including any higher-density display requirement, rather than choosing the smallest dimensions possible.

For example, reducing a 6000 × 4000 photo to 1200 × 800 changes the pixel count from 24,000,000 to 960,000. That is 4% of the original pixel count. This calculation does not mean the file will be exactly 4% of its original size: encoding, metadata and image detail affect the result.

If the image already has the correct dimensions, skip resizing and compare compression instead. Enlarging a small image to satisfy a size requirement creates more pixels but cannot recover original detail that was never recorded.

Compare a small number of exports from the original

Open the Image Compressor, add your images and start with Balanced. Keep the format if it already meets the destination’s requirements. If the result is still too large, try Smaller file or a suitable different format. Keep detail prioritizes fidelity; it does not guarantee a smaller file.

Inspect the result at its intended display size and at full size. Check edges around faces, fine texture, gradients and small text. A preview fitted into a small screen can hide artifacts that become visible in a product zoom or printed document. Use the before-and-after comparison and check the actual output byte size.

Always make the next attempt from the original file. Repeatedly recompressing an already lossy JPEG can add damage without producing a useful improvement. A quality value is an encoder setting, not a universal percentage of visual quality, and the same number behaves differently across formats.

• Keep small text readable and edges free of obvious halos or blocks.
• Check transparent regions against both light and dark backgrounds.
• Confirm the downloaded extension is accepted by the destination.
• Open the saved result, then test the upload before deleting any original.

Why a compressed file can become larger

A file may already be efficiently compressed. A new format, higher-quality export or different encoding can make it larger. PNG can preserve sharp graphics well but be inefficient for a detailed photograph. Converting a photo to PNG does not improve information that was lost in an earlier JPEG export.

Use the smaller acceptable result rather than assuming every processed file is an improvement. If neither result meets the target, return to the requirements: reduce unnecessary dimensions, choose another accepted format or accept a carefully checked lower-quality setting.

The compressor accepts up to 20 images in a queue, up to 25 MB each and 100 MB in total. These are service upload limits, not a promise that every complex or animated image can be processed. A failed item can be retried individually; a queue completion does not mean every file succeeded.