Which image formats can I compress?

JPG, PNG, WebP and AVIF. You can keep the format or save as JPG, PNG, WebP or AVIF instead.

Can I compress a photo to an exact size in KB?

Yes. Enter a target file size and the tool finds the highest quality that fits under it. This works for JPG, WebP and AVIF output.

Can I compress several images at once?

Yes. Drop several images, then download them one by one or together as a ZIP. They are compressed on your device, not uploaded.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Are my files uploaded?

No. Your files are opened and processed inside your browser and are not sent to LibraTool. Some tools first download a processing engine or AI model to your browser; that download contains no data of yours.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install. Very large files can be slow or run out of memory on a phone, so use a computer for those.

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Free Image Compressor

Compress JPG, PNG, WebP, and AVIF images. See before/after comparison.

File size depends on your deviceFiles stay privateNo login requiredFree foreverNo watermark

Drop files here, or click to browse

JPG, PNG, WebP, AVIF, HEIC, HEIF · processed on your device

or press Ctrl+V to paste from your clipboard

You can drop multiple files at once

Browse files

Tip: paste an image from your clipboard (Ctrl+V) to load it instantly.

Your files never leave your device. All processing happens locally in your browser.

Optimize for your platform

Compress Images for Email Resize Images for Instagram Resize Images for Twitter (X)

Common uses

Compress Images for WhatsAppOptimise photos for WhatsApp in one click — reduced file size, perfect 1600 px width, no visible quality loss.
Resize Images for FacebookResize photos to Facebook's recommended 2048 px at high quality — Facebook re-compresses all uploads, so the better your source, the sharper the result.
Compress Images for WebsitesShrink images for your website — smaller files mean faster page loads, better SEO, and lower hosting costs.

How It Works

Image compression here uses the browser's built-in encoding engine — the same code that powers Chrome, Firefox, and Safari. No external service, no upload, no privacy compromise.

1
You drop one or more images
Each image is loaded into a hidden <canvas> element in your browser. The canvas holds the raw pixel data.
2
Canvas.toBlob() re-encodes at your chosen quality
You pick the format (JPEG, WebP, PNG) and quality level. The browser re-encodes the pixels using its built-in image encoder. You see a live before/after preview as you adjust.
3
The compressed file is downloaded
Click Download and your browser saves the result to your device. For batches, individual files or a ZIP are offered.

Even your image previews are blob URLs pointing to memory in your browser — they are never URLs to images stored on our servers.

Related Tools

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GIF Compressor

Make an animated GIF smaller: fit it under a size limit such as Discord's 256 KB emoji or 512 KB sticker, or choose colours, width and frames yourself. Runs in your browser; the GIF is not uploaded.

Try itFiles stay local

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