Free private image utility

Image Compressor

Reduce JPEG, PNG or WebP image size, optionally limit dimensions, compare the result and download it without uploading the image to a server.

Compress an image

Choose one image up to 20 MB. The tool processes one file at a time so you can check quality before downloading.

Supported formats: JPEG, PNG and WebP.
Used for JPEG and WebP. PNG ignores this quality value.
JPEG/WebP only. Very small targets may require smaller dimensions.

No login is required. The selected image is processed inside your browser and is not sent to OpenStudyInfo.

How to compress an image online

  1. Choose a JPEG, PNG or WebP file from your device.
  2. Select the output format. Keeping the original format is the safest starting point.
  3. Keep original dimensions or set a maximum width or height to reduce large photos.
  4. Choose a JPEG/WebP quality level. Start around 80–85% and inspect fine details.
  5. Enter an optional maximum KB only when a portal has a file-size limit.
  6. Select Compress image, compare both previews and download the result.
Best practical approach: Reducing an unnecessarily large image’s dimensions often saves more space than forcing very low quality. Always check text, faces and document edges after compression.

JPEG, PNG or WebP: which format should you use?

JPEG

JPEG is widely accepted and works well for photographs. It uses lossy compression, so repeated editing or very low quality can create visible blocks and blur. Transparent areas become white in this tool.

PNG

PNG is useful for screenshots, logos and graphics needing transparency. Browser canvas export does not provide the same adjustable quality control for PNG, so the quality slider and maximum-KB target are not used.

WebP

WebP can produce small files at good visual quality, but an older portal may not accept it. Use only a format listed by the receiving website.

Changing format is not automatically the best compression method. A PNG screenshot may remain clearer as PNG, while a camera photograph is often much smaller as JPEG or WebP.

What affects the final file size?

  • Pixel dimensions: More pixels usually require more data.
  • Image detail: Hair, leaves, noise and text can be harder to compress than smooth backgrounds.
  • Quality: Lower JPEG/WebP quality normally reduces size but can damage detail.
  • Format: Different formats handle photos, transparency and flat graphics differently.
  • Target KB: The tool tries lower quality levels, but it cannot guarantee an exact size.

Canvas re-encoding usually does not carry most original metadata into the new image. Do not treat this as a guaranteed metadata-removal or privacy-audit tool. Review the downloaded file and avoid sharing sensitive images unnecessarily.

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Frequently asked questions

Will image compression reduce quality?

JPEG and WebP compression can remove visual detail. Use the preview to choose a balance between file size and clarity. PNG export does not use the quality slider.

Can I compress an image to an exact KB size?

The tool can try to keep JPEG or WebP output under a selected maximum, but an exact size is not guaranteed. Reducing dimensions may be necessary.

Does the tool enlarge small images?

No. A selected maximum dimension only reduces images that are larger than that limit; it does not enlarge smaller images.

Why is my PNG not much smaller?

PNG uses lossless image compression and browser export ignores the quality slider. Try smaller dimensions or JPEG/WebP if the receiving portal accepts them.

Is my image uploaded or stored?

No. Compression happens inside your browser and OpenStudyInfo does not upload or store the selected image.

OpenStudyInfo is an independent utility provider. Check the receiving portal’s official image requirements before uploading a compressed file.

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