Is this image compressor really private?

Yes. All compression, resizing, and format conversion happens entirely inside your web browser using the HTML5 Canvas API. Your images are never uploaded to any server, stored, or shared. You can even disconnect from the internet after loading the page and the tool will continue to work perfectly.

What image formats does this tool support?

The tool accepts JPG, PNG, WebP, and GIF images as input. For output, you can choose between JPG, WebP, PNG, or let the tool automatically pick the best format. WebP typically produces the smallest files, while PNG preserves transparency.

How does "By Target Size" mode work?

Target Size mode runs a smart binary search on compression quality. You specify a target file size (for example, 50 KB), and the tool automatically finds the highest quality setting that keeps the file at or under that size. It can also downscale dimensions if needed, and try WebP if JPG cannot hit the target.

What is the difference between quality and target size modes?

By Quality mode lets you set a compression quality slider (e.g. 75%) and the tool applies it directly — the output file size depends on your image content. By Target Size mode is the opposite: you specify the desired file size, and the tool works backwards to find the best quality that fits. Target Size mode is ideal when you have a strict size limit (like for a website upload form).

What is the "Minimum Quality Floor" setting?

This setting prevents the tool from dropping quality below a certain threshold. Instead of over-compressing and creating a blurry image, the tool will shrink the image dimensions to fit the target size while keeping quality above your floor. This results in much sharper-looking output, especially for photos.

What is "Auto-downscale" and when should I use it?

When enabled, the tool is allowed to reduce image dimensions (width and height) to hit your target size. This is often better than dropping the quality very low — a slightly smaller but sharp image usually looks much better than a full-size but blurry one. It is especially useful for photos being shared on websites or messaging apps.

What is "Smart Format Fallback"?

When enabled and Auto format is selected, the tool will try WebP as an alternative if JPG or PNG cannot fit your target size. WebP typically produces files 25–35% smaller than JPEG at similar visual quality, making it a great fallback for tight size limits. If you explicitly select JPG or PNG, the tool respects your choice and does not switch formats.

Is there a file size or count limit?

We recommend keeping individual files under 25 MB and processing no more than 10–20 images at once for smooth browser performance. The tool processes images sequentially, so very large batches may take a while. All processing is limited only by your device's memory, not by any server restrictions.

🖼️

Image Compressor

Compress, resize and convert images right in your browser. 100% private — no uploads.

📤

Drop images here

📁 Choose Images

Supports JPG, PNG, WebP, GIF · Max 25 MB per file
🔒 100% browser-based — images never leave your device

Compression Mode

Compression Quality 75%

Smaller file Better quality

Target File Size

⚙️ Advanced Optimization

Min Quality Floor ?

40%

Auto-downscale ?

Smart Format Fallback ?

Optimization Passes ?

💡 We'll find the best quality + dimensions combo to fit your target.

Output Format

Custom Size

Width

Height

💡 Tip: Leave both empty to keep original size.

All About Our Image Compressor

Images are the largest files you will find on most websites. This can be a real pain when you need to upload them to forms, email or social media. All platforms will have size limits such as 50KB, 100KB, 2MB and nothing is worse than having an amazing image that won't fit.

Our image compressor helps you solve this problem. As it uses the HTML5 Canvas API, all of your images will be compressed in your browser. Meaning your images will never leave your device. You get professional class compression with lots of advanced settings.

How to Use

To start, simply upload your images. This can be done with the 'Choose Images' button, drag and drop or by pasting. You can compress multiple files.
Choose your compression type.
- Quality - Simply choose the quality (e.g. 75%) using the slider.
- Size - Choose your target size (e.g. 50KB).
Choose your image output type.
- Auto - This will choose the best type. WebP is typically the smallest. JPG is the most compatible and PNG will keep transparency.
Choose your dimensions.
- Custom - Input your own dimensions. Or choose from 25%, 50%, 75% or Original.
Click 'Compress Images' button. You can then download each image or all in one go.

Advanced Optimisations

When you choose 'Size' you get access to some really advanced features to make this a powerful image compressor.

Min Quality - This sets a minimum quality (e.g. 40%). So the compressor will never go below this. You will get a smaller image by reducing the dimensions instead of losing quality and getting a blurry image.
Auto-resize - This allows the compressor to reduce the width and height of your image. This will give you a slightly smaller but clear image.
Smart Format - If your image isn't small enough using JPG/PNG, it will automatically try WebP. WebP is typically 25-35% smaller than JPEG but still keeps the same quality.
Number of Optimisations - This allows you to choose how many times the compressor will run through it's binary search. Fast (3) will give quicker results. Thorough (10) will give you more accurate results.

Why Use Our Image Compressor?

There are plenty of image compressors out there but we offer some unique features.

You can rest assure your images are 100% private. No images will be uploaded, stored or logged. They will all stay in your browser. So you can feel safe using it for personal images, client work and sensitive documents.
Size - No longer have to fiddle around with the quality slider. Just enter your target size (e.g. 50KB).
Smart optimisations - With Min Quality, Auto_resize and Smart Format you will always get the best results.
Multiple files - Compress many images in one go and download everything in one click.
Everything is free! No sign up, no interruptions from ads, no watermark and no limitations.

Why Use Image Compression?

People use image compression for many reasons.

To upload images to job applications, visa forms or exams with size limits.
To reduce the size of images to attach to emails.
Product images for e-commerce.
Image optimisation for faster websites and better SEO.
Compress screenshots.
Reduce image size for WhatsApp, Telegram or social media.
Prepare images for printing with a specific resolution.

FAQs

Is this a private image compressor?

Yes! Everything is done within your browser using HTML5 Canvas API. No images will ever be uploaded to a server. You can even turn your internet off once the page has loaded and it will still work perfectly!

What image types can I use?

JPG, PNG, WebP and GIF. You can choose to output as JPG, WebP, PNG or let it choose the best option for you. WebP will give you the smallest files. PNG will keep transparency.

How does Size work?

This will perform a smart binary search on your compression quality. Simply enter your target size (e.g. 50KB) and it will automatically find the highest quality setting for you. It can also reduce your dimensions and try WebP if necessary.

What is the difference between Quality and Size?

Quality allows you to choose the quality (e.g. 75%) to compress your image. The output file size will depend on the contents of your image. Size will do the opposite. Enter your target file size and it will work backwards to find the best quality for you. Size is best if you have strict size limits e.g. uploading to a website.

What is Minimum Quality?

This stops your image quality going below a certain point. Instead of over compressing and losing quality you will get a smaller image by reducing the dimensions. This will give you much clearer looking images, especially with photos.

What is Auto-resize?

This allows your image to be reduced in size (width & height). Often this is better than reducing the quality too low. You will get a slightly smaller image but it will still be clear. This is great for photos that you are sharing on websites/messaging apps.

What is Smart Format?

If you have Auto format selected and this is enabled, it will try using WebP if your image is too big using JPG/PNG. WebP will typically give you a 25-35% smaller file than JPEG whilst keeping the same quality. If you have specifically chosen to use JPG/PNG it will respect this.

Are there any size/quantity limits?

We recommend keeping files below 25MB. We would also recommend not to compress more than 10-20 images at once. This will ensure your browser runs smoothly. The images will be processed one by one so if you have a lot it may take a while. There are no limits on how many you can compress as it's only limited by your devices memory.

Other Tools You May Like

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