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Image compression works best when you know what problem you are solving. A website image, email attachment, upload form, and social post may all need different file sizes, formats, and quality settings.
Updated: May 8, 2026
At a glance
Quick summary
Open the calculator
Compress JPG, PNG, and WebP images locally in your browser, reduce file size for websites, email, and uploads, and choose quality settings.
Try the calculatorGuide overview
A practical reading layout with the main decision points up front.
Section 01
Before compressing an image, decide where it will be used. A website hero image needs a different balance than a product thumbnail, email attachment, profile photo, or document upload.
Section 02
Higher quality keeps more detail but produces a larger file. Lower quality can shrink the file quickly but may add blur, banding, or blocky artifacts. The best setting is usually the lowest size that still looks clear at the final display size.
Section 03
A very large photo can stay heavy even after compression. If the image will only display at 1200 pixels wide, uploading a 5000-pixel-wide version wastes bandwidth. Resize large images before or during compression when possible.
Section 04
JPG is usually good for photos, PNG is useful for screenshots, graphics, and transparency, and WebP often gives strong web compression for both photos and graphics. The right choice depends on the image and where it will be used.
Section 05
Smaller images can reduce page weight and improve perceived speed. That matters for users and search performance, especially on mobile connections where oversized media can slow the first view.
Section 06
Email and upload forms often have strict file-size limits. If compression alone is not enough, resize dimensions, convert to WebP or JPG, and remove unnecessary transparency or metadata where possible.
Section 07
Avoid aggressive compression for logos, text-heavy screenshots, product images, medical or legal documents, and images that need close inspection. In those cases, clarity is more important than the smallest possible file.
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More guides
Common questions
Compress the image, reduce dimensions if needed, and choose a format such as JPG, PNG, or WebP that fits the image type.
Lossy compression can reduce quality, but balanced settings often make the file much smaller with little visible change.
WebP can be smaller for many web images, but JPG remains useful for compatibility and photo workflows.
Use the smallest dimensions and file size that still look sharp at the final display size.