Image Compressor

What you can do with this image compressor

• Compress JPEG, PNG, WebP, GIF, and BMP images in your browser
• Upload up to 20 images at once — all compressed in parallel
• Choose JPEG, WebP, or PNG output with a quality slider for lossy formats
• Optional max-width resize to shrink large photos for the web
• Per-image original vs compressed preview with size savings
• Keeps the original file when re-encoding does not reduce size
• Download one image or all successful results — no account required
• Private by design: nothing is uploaded or stored on a server

How browser image compression works

Common ways people use an image compressor

• Web and blog images

  Shrink hero photos and article images so pages load faster without an obvious quality drop.

• Email and chat attachments

  Reduce photo size before sending so messages stay under attachment limits.

• Product and listing photos

  Export storefront images at a practical width and high visual quality.

• Screenshots for docs

  Convert oversized PNGs to WebP or JPEG when you need smaller shareable assets.

• Social and portfolio uploads

  Meet platform size caps while keeping photos looking sharp on phones and desktops.

• Privacy-sensitive photos

  Compress on-device when you do not want images uploaded to a third-party compressor.

Privacy: no upload, no stored images

Tips for smaller images without an obvious quality drop

• Start around 90–92% quality for photos — often visually close to the original with a useful size cut.
• Prefer WebP for web delivery when your audience's browsers support it; it often beats JPEG at the same perceived quality.
• Resize huge phone photos to 1600–1920px wide when you only need them on websites or email.
• Keep PNG for screenshots with text or UI chrome; switch to WebP when you need smaller files and can accept a different format.

Who this compressor is for

• Developers and designers optimizing assets for faster pages
• Sellers and creators preparing listing or portfolio photos
• Anyone who wants a private, browser-only image compression path

Frequently asked questions

What is an image compressor?

An image compressor reduces file size by re-encoding pixels (and optionally resizing). Smaller files download faster and are easier to upload, email, or host.

Do I need an account to use this image compressor?

No. Toolshelf Image Compressor requires no account, no usage quotas, and no server-side storage of your images.

Does my image get uploaded or stored?

No. Compression runs locally in your browser with the Canvas API. Downloads use a temporary blob URL that is revoked after the save starts. Nothing is sent to or kept on our servers.

Will compression reduce image quality?

JPEG and WebP use a quality slider — higher values keep more detail and usually look visually lossless for photos. PNG output is lossless (no quality slider) but may not shrink as much. The tool keeps your original file when re-encoding the same format does not produce a smaller result.

Which formats are supported?

Input: JPEG, PNG, WebP, GIF, and BMP (up to 25 MB each). Output: JPEG, WebP, or PNG. Animated GIFs become a single frame when compressed. SVG and HEIC/HEIF are not supported.

Can I compress multiple images at once?

Yes. You can upload up to 20 images in one selection (or add more until you reach 20). Every selected image is compressed in parallel in your browser. Download each file individually or use Download all for successful results.

What does max width do?

If the image is wider than the max width you set, it is scaled down proportionally before encoding. Leave max width blank to keep original dimensions when possible. Very large photos (for example multi‑megapixel camera files over about 8192px on a side) are automatically downscaled to a browser-safe size so compression still works.

Why did my file get larger or stay the same size?

Some files are already well optimized. The compressor steps JPEG/WebP quality down automatically and may switch PNG photos to WebP or JPEG when that produces a smaller file. If nothing smaller is possible at the same dimensions, it keeps your original bytes and labels the result as already optimized.

Does the image compressor work on mobile?

Yes. Controls stack on small screens, the drop zone is tappable, and you can compress and download on phones and tablets.

Is browser image compression safe for private photos?

This tool is designed for privacy: processing stays in your browser and files are not uploaded to Toolshelf servers. Still avoid using any site you do not trust with highly sensitive images, and review our Privacy Policy for details.