Image Compressor
Reduce JPEG, PNG and WebP file sizes while keeping the original pixel dimensions.
How to compress an image
This free image compressor reduces the file size of static JPEG, PNG and WebP images while preserving their original pixel dimensions. The process is automatic: the tool evaluates safe candidates and keeps the smallest result that passes its visual quality checks.
- Choose a supported image from your device.
- Review the original dimensions, format and file size.
- Select Compress image and wait while the candidates are tested.
- Review the output size, difference, metadata result and quality-gate message.
- Download the result when it is smaller and suitable for your use.
What smart compression means
The tool does not apply one fixed quality value to every image. Photographs, screenshots, graphics and already optimized files behave differently, so the compressor tests multiple candidates instead of guessing from the filename or format.
Each candidate is decoded again and compared with the source through the tool's quality gate. The smallest candidate that remains within the accepted visual limits is selected. If no smaller candidate passes, the tool can retain the original. When removable metadata must be cleaned, it may instead offer a safe cleaned copy and clearly report if that copy is slightly larger rather than calling it a size reduction.
How JPEG and WebP compression works
JPEG and WebP use lossy encoding, which can reduce file size by simplifying image detail. The compressor automatically searches several quality levels and stops at the smallest candidate that passes its checks. Pixel width and height remain unchanged.
A file that has already been carefully optimized may not become smaller. Re-encoding it at a higher effective quality could increase its size, so the tool compares the candidate with the original before offering the result.
How PNG compression works
PNG is a lossless format, but some PNG images can be made smaller by using a reduced color palette. The compressor tests palette compression when the image is suitable and verifies the visual result before accepting it.
Images that need more colors, contain complex transparency or exceed the safe palette-processing limit use a lossless fallback. This may produce only a small saving because the original PNG could already be efficient. Transparent pixels and the alpha channel are preserved.
Metadata, color and transparency
Image files can contain EXIF camera details, GPS coordinates, XMP data, comments and embedded thumbnails. The compressor reports what happened to removable source metadata in the result panel. Rendering-critical information needed for a safe visual result is handled separately from private descriptive metadata.
PNG and WebP transparency is preserved. The tool does not flatten transparent areas onto a white background, change the pixel dimensions or intentionally crop the image. Unsupported color or HDR conditions are rejected when they cannot be processed safely.
Why an image may already be optimized
Compression cannot guarantee a smaller file for every source. A modern camera app, image editor, website optimizer or another compressor may already have removed most unnecessary data. Simple graphics can also be close to the practical minimum for their format.
When the potential saving is negligible or a smaller candidate fails the visual checks, retaining the safer result is more useful than forcing a lower-quality download. The result panel explains the decision and shows the measured size difference.
Current file and image limits
The current input limit is 40 MB, 24 megapixels and 20,000 pixels on either side. PNG palette compression is limited to images up to 12 megapixels; other supported PNG files use the lossless path. These conservative limits reduce the risk of browser memory exhaustion, especially on phones and tablets.
Animated PNG and animated WebP files are not supported because compressing only the first frame would silently damage the content. JPEG, PNG and WebP signatures are checked before processing.
Private local processing
The compressor is free to use. Decoding, candidate generation, visual checks and export happen in your browser. The image is not uploaded to an image-processing API, and the tool does not need an account, cloud queue or remote storage.
Large processing tasks run through the tool's local browser worker so the interface can remain responsive. Closing or refreshing the page removes the current in-memory image and result.
Frequently asked questions
Is this image compressor free?
Yes. You can compress supported images without an account, subscription or upload.
Will every image become smaller?
No. An already optimized image may not have a smaller candidate that passes the visual quality checks. The result panel explains what happened.
Does compression change the image dimensions?
No. The compressor keeps the original pixel width and height. Use the Image Resizer when you need different dimensions.
Does the compressor remove metadata?
The result panel reports removable source metadata such as EXIF, GPS, XMP, comments and thumbnails. Rendering-critical information is handled separately.
Is my image uploaded?
No. Candidate generation, quality checks and export happen locally in your browser.