Image Compressor

How it works

Compress images in 3 simple steps

No account, no upload, no waiting in a queue.

1
Add your images
Drag & drop, choose files or a whole folder, or paste from the clipboard. Add as many as you like.
2
Pick your settings
Use a preset or fine-tune quality, format, target size, dimensions and metadata.
3
Download
Save images one by one or everything at once as a ZIP — with folders preserved.

Why ToolCMB

A smarter, safer image compressor

Professional-grade codecs running entirely inside your browser.

Private by design

Images never leave your device. No upload, no storage, no tracking of your files — ideal for GDPR-sensitive work.

Best-in-class codecs

MozJPEG, libwebp, AVIF (AV1) and OxiPNG — the same engines used by professionals — compiled to WebAssembly.

Batch & ZIP

Compress hundreds of images at once using all CPU cores, then download a single ZIP.

Target file size

Need a photo under 200 KB for a form or email? Set the size and we find the best quality automatically.

Resize while compressing

Scale down to 4K, Full HD or any custom size. Smart downscaling keeps images crisp.

Convert formats

Turn HEIC, PNG, TIFF or BMP into JPG, WebP or AVIF in the same step.

Before / after preview

Inspect every result with a zoomable comparison slider and tweak quality per image.

Works everywhere

Desktop, tablet or phone — Chrome, Edge, Firefox and Safari. Nothing to install.

How to reduce image file size without losing quality

Large images are the number-one reason web pages load slowly. Compressing them improves Core Web Vitals, SEO rankings and conversion rates, and makes photos easier to share by email or upload to online forms.

This tool uses lossy compression tuned to human perception: it removes detail your eyes cannot see, typically cutting file size by 60–90% while the image looks the same. For graphics that must stay pixel-perfect, enable lossless PNG.

Choosing the right format matters as much as the quality setting. Modern formats like WebP and AVIF are often 30–50% smaller than JPG at the same visual quality.

Supported formats at a glance

Format	Best for	Tip
JPG / JPEG	Photos	Quality 70–85 is visually lossless for most photos.
PNG	Logos, screenshots, transparency	Colour reduction gives 50–80% savings.
WebP	Websites	Supports transparency and is smaller than JPG.
AVIF	Websites, maximum savings	Best compression available today.
HEIC / HEIF	iPhone photos	Convert to JPG for universal compatibility.
GIF, BMP, TIFF, ICO	Legacy files	Converted to a modern, much smaller format.
SVG	Vector graphics	Minified without changing the vector.

Pro tips

Resize before sharing: a 12-megapixel phone photo is 4000 px wide — most screens need 1920 px or less.
For websites, use WebP or AVIF; for maximum compatibility (email, older software), use JPG.
Remove metadata before posting photos publicly — it can reveal the exact GPS location where the picture was taken.
Use the before/after view at 100% zoom to check faces, text and fine details.

FAQ

Frequently asked questions

Everything you need to know about compressing images with ToolCMB.

Is this image compressor really free?

Yes. It is 100% free with no limits on the number of images, no sign-up and no watermark. The site is supported by ads.

Are my images uploaded to a server?

No. All compression runs locally in your browser using WebAssembly. Your images are never uploaded, stored or seen by anyone — you can even disconnect from the internet after the page loads.

How much can I reduce the file size?

Typically 60–90% for photos from cameras and phones, and 50–80% for PNG screenshots, depending on the image and the settings you choose.

Will compression reduce the image quality?

With the Balanced or Best quality presets the difference is practically invisible. Use the before/after comparison to check any image at 100% zoom.

Which image formats are supported?

You can open JPG, PNG, WebP, AVIF, GIF, HEIC/HEIF, TIFF, BMP, ICO and SVG files and save them as JPG, PNG, WebP or AVIF.

Can I compress an image to a specific size, like 100 KB?

Yes. Turn on “Compress to a target file size”, enter the size in KB or MB and the tool automatically finds the highest quality that fits.

Can I compress many images at once?

Yes. Drop multiple files or a whole folder. Images are processed in parallel and you can download them individually or together as a ZIP file.

Does it remove EXIF and GPS data?

By default all metadata, including GPS location, is removed for your privacy. You can choose to keep metadata or keep it without the location.

Does it work on iPhone and Android?

Yes. The compressor works in modern mobile browsers, including Safari on iPhone and Chrome on Android. You can convert iPhone HEIC photos to JPG too.