Image Compressor Online – JPG, PNG, WebP & AVIF

How to Compress an Image Online

1. Choose Private Browser or Advanced Server mode.
2. Upload a supported image within the limit displayed for that mode.
3. Select Smart, Lossy, Lossless or Target Size when available.
4. Keep the original format or choose JPG, PNG, WebP or AVIF.
5. Set quality and encoder effort where applicable.
6. Optionally reduce maximum width and height without upscaling.
7. Decide whether advanced mode should preserve metadata.
8. Review the measured result and download the compressed image.

Private Browser Mode

Private mode accepts JPG, PNG and WebP files up to 20 MB, subject to a 24-megapixel safety limit. Canvas encoding occurs locally. JPG output places transparency on white; PNG preserves transparent pixels; WebP provides efficient photographic and web-asset compression.

Browser encoders vary slightly between Chrome, Safari, Firefox and other browsers. A quality value is therefore a useful control, not a universal visual standard.

Advanced Server Mode

Advanced mode accepts files up to the server upload limit currently shown in the interface, with JPG, PNG, WebP, AVIF and HEIC accepted when recognized by the server. It can output JPG, PNG, WebP or AVIF. HEIC input defaults to a web-compatible output when Original is selected.

The endpoint validates the detected MIME type, rejects animated files and images above 24 megapixels, applies rate limiting and deletes generated output after the response.

Smart, Lossy and Lossless Compression

Smart mode aims for a practical balance and may keep an already efficient private-mode original when re-encoding would make it larger. Lossy mode trades some image information for smaller output.

True lossless advanced output is available for PNG and WebP. JPG and AVIF are not presented as lossless because re-encoding those formats cannot honestly guarantee identical pixel data under this workflow.

Target File Size Is an Approximation

Advanced Target Size mode tests several quality levels for JPG, WebP or AVIF and keeps the highest candidate at or below the requested byte target when possible. It cannot guarantee that every image will reach an extremely small target.

Pixel dimensions and image complexity frequently matter more than the quality number. If a detailed photograph cannot reach the target acceptably, reduce its maximum width and height instead of forcing severe artifacts.

Quality, Encoder Effort and File Size

Quality controls the lossy trade-off between visual fidelity and bytes. Encoder effort asks the server to spend more work finding an efficient representation; higher effort may take longer and does not guarantee a dramatic reduction.

Flat graphics, screenshots, noisy photographs and already optimized images respond differently. Judge the preview and measured bytes rather than assuming one quality setting fits every image.

Resize While Compressing

Reducing width and height lowers the number of pixels that must be stored and can save more space than aggressive quality reduction. The tool preserves aspect ratio, fits within both maximum dimensions and never enlarges the source.

For upload portals with strict limits, a moderately resized high-quality image often looks better than a full-size image compressed at very low quality.

JPG, PNG, WebP and AVIF

JPG is widely compatible and effective for photographs but cannot store transparency. PNG is best for transparency, diagrams, interface captures and hard edges, though photographic PNG files can be large.

WebP supports transparent and photographic web assets with broad modern-browser support. AVIF can achieve excellent compression but requires Advanced Server mode and may encode more slowly.

Metadata and EXIF Privacy

Private canvas export normally creates a new pixel file without the source EXIF payload. Advanced mode strips metadata by default. Enabling Preserve Metadata may keep camera, date, copyright or location profiles.

Auto-orientation is applied before output so photographs are not intentionally left rotated when orientation metadata is removed.

Avoid Repeated Lossy Compression

Every lossy re-encoding can introduce another generation of artifacts. Work from the best original available, perform resizing and format selection once, and compress only for the final delivery copy.

If the result is larger than the source, the original may already be well optimized. Try a modern format, reduce dimensions or keep the original rather than assuming another pass must help.

Common Uses for Image Compression

• Optimize website and blog images.
• Prepare product photos for ecommerce.
• Meet document-portal file limits.
• Reduce email attachment size.
• Create AVIF or WebP web assets.
• Remove metadata before sharing.
• Resize social-media images while compressing.
• Measure whether an existing image is already optimized.

Image Compressor Specifications