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Compress image size online with proportional resizing and optimize image quality.
Click or drag images here to upload
Supports common formats like JPG, PNG, WebP. Batch upload is available.
No images uploaded. Upload to begin compression.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This image compressor processes one or more selected image files. Choose a quality value, set maximum width and height, then compress an item or the pending items together. Each result shows the output dimensions and file size alongside the original, and completed files can be downloaded individually or together.
Quality controls the encoder setting; lower values generally trade visual fidelity for smaller output, but the resulting file is not guaranteed to be smaller. Maximum dimensions act as ceilings: an image that exceeds either selected limit is scaled proportionally to fit both, while a smaller image is not enlarged. The canvas export step re-encodes the image using its detected format where available.
PNG inputs are exported as JPEG. Before drawing, the image is placed over a white canvas, so transparent areas become white and the saved JPEG cannot retain transparency. Other accepted image types are exported using their input MIME type when the browser supports it; browser encoder behavior can affect the final output. This is a pixel re-encoding and possible resize, not a promise of lossless optimization or a specific file-size reduction.
Canvas image export uses an image type and quality value where supported; the quality setting chiefly applies to lossy formats. The browser’s canvas API documentation describes this encoding behavior. Check the downloaded file before replacing an original.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Select or drag in the images you want to process. Unsupported files that are not recognized as images are ignored.
Set the quality slider from 10 to 99. Start higher when fine detail matters and lower it gradually if file size is the priority.
Choose maximum width and height independently, or select no limit for either dimension. The image keeps its proportions if it needs to shrink.
Compress one image or use Compress All. Compare the displayed dimensions and byte size, then download the output you want to keep.
Use cases
See how the tool fits into real work and everyday tasks.
For a large photo, lower the dimension ceilings to the largest display size you need, then review the preview and resulting file size before publishing.
When an upload has a size limit, try a smaller maximum dimension or quality setting. Check the output size after each pass because this tool does not target an exact KB limit.
Keep the source PNG if clear backgrounds matter. This tool converts PNG input to JPEG on a white canvas, so use its download only when a solid background is acceptable.
Q&A
Find concise answers to common questions and confusing cases.
No. Re-encoding can produce a larger file, especially when the original was already optimized. Compare the before and after sizes.
No. PNG input becomes JPEG and transparent pixels are filled white. Keep the original or use a workflow that exports transparency-preserving PNG.
No. If either maximum dimension is exceeded, the image is scaled proportionally to fit the width and height limits; it is not enlarged when already within them.
Notes
Review scope, result limitations, and important precautions before use.
Lower quality can introduce visible artifacts, and reducing dimensions removes image detail that cannot be recovered by enlarging the output later. Keep an original copy when image quality, transparency, or exact color rendering matters. Large images may also take longer to process or exceed browser memory available to the page.
Files are processed through the page’s browser image and canvas features. Avoid relying on this workflow for sensitive material unless you have reviewed the service and browser context in which you are using it.
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