Image Compressor

Image Compressor re-encodes a picture through an in-browser HTML canvas to shrink its file size, letting you dial in how much quality to trade for smaller bytes. Add a JPG, PNG, WebP, or GIF, adjust the Quality slider, and press Compress Image to see the new size and the percent saved next to the original. The whole operation runs on your device, so the picture never leaves your browser.

Click or drag an image here

JPG, PNG, WebP, GIF supported

How was this tool?

Your feedback helps us improve Image Compressor.

Why use Image Compressor?

Image Compressor reduces the file size of one picture at a time, entirely inside your browser. When you add an image it is drawn onto a hidden HTML canvas sized to the original dimensions, then read back out through the canvas toBlob method at the quality you selected. Because that pipeline runs client-side, nothing is transmitted to a server and you get the compressed copy the moment processing finishes, with no account or upload wait. The layout stays minimal. An upload panel labeled 'Click or drag an image here' takes JPG, PNG, WebP, and GIF files and reports the original size in kilobytes as soon as one is loaded. A Quality slider then appears, running from 10% to 100% in increments of five and starting at 80%. Pressing 'Compress Image' places the compressed version beside the original, each with its size, along with the percentage reduction figured from the two byte counts. From there 'Download Compressed' saves the file under your original name with a compressed_ prefix, and 'Clear' empties the panel so you can bring in a different picture. Understanding the output format explains the results you will see. A PNG source is written back as a PNG, and since PNG encoding is lossless the Quality slider changes little and the size may hold steady. JPG, WebP, and GIF sources are re-encoded to JPEG, where the quality setting truly governs the trade between clarity and bytes. That makes the tool most rewarding for photographic content, where shaving a little quality can drop a large share of the file size, and it processes a single picture per run rather than a queue.

Key benefits

Compression happens locally through an HTML canvas, so the image is never sent to or stored on a server
The result panel reports the compressed size in KB and the exact percent reduction, computed against the original bytes
One Quality slider from 10 percent to 100 percent gives direct control over the size against clarity balance
Handles the common web formats JPG, PNG, WebP, and GIF from a single click-or-drag panel
No account, email, or install is needed and the saved file carries no watermark

Features

Click-to-browse or drag-and-drop upload that accepts any image file type
Quality range slider spanning 10 to 100 percent in steps of 5, defaulting to 80 percent
Original and compressed images shown as side-by-side thumbnails with live KB readouts
PNG input is written back as PNG, while JPG, WebP, and GIF are re-encoded to JPEG
Download button that prefixes the saved file with compressed_ on your original file name
Clear button that empties the upload panel and preview so you can start fresh

Popular use cases

Trimming a photo down before attaching it to an email or a form that enforces an attachment cap
Lightening product or article images so a page loads faster without opening a full editor
Getting a large screenshot or scan under an upload limit on a portal or application form
Experimenting with the slider to find the lowest quality that still looks acceptable, using the live percent-saved readout as a guide

How to use Image Compressor

1
Add an image
Click the upload panel that reads 'Click or drag an image here', or drop a JPG, PNG, WebP, or GIF onto it. The panel then shows the file name and the original size in KB.
2
Choose a quality level
Once the preview appears, drag the 'Quality' slider. It moves from 10% to 100% in increments of 5 and starts at 80%. The current percentage is shown right on the label.
3
Run the compression
Press 'Compress Image'. The button reads 'Compressing…' while it works, then a compressed thumbnail appears beside the original with its size in KB and how many percent smaller it is.
4
Save or reset
Click 'Download Compressed' to save the file, which keeps your original name with a compressed_ prefix. Press 'Clear' whenever you want to empty the panel and load a different picture.

Frequently asked questions

Does my image get uploaded anywhere?

No. The file is read locally and re-encoded with an in-browser canvas. There is no network request for the compression, so the picture stays on your device the entire time.

Which image formats does it accept?

You can load JPG, PNG, WebP, and GIF files. When you compress, PNG is saved back as PNG, while JPG, WebP, and GIF are re-encoded to JPEG.

What exactly does the Quality slider control?

It sets the encoding quality from 10% to 100% in steps of 5, defaulting to 80%. This value drives the JPEG output, where lower quality means a smaller file. PNG input is re-encoded losslessly, so the slider has little effect on PNG size.

Can I compress a batch of images together?

Not in one pass. Each run handles the picture currently loaded in the panel. Compress and download it, then press Clear and add the next file.

Is there a maximum file size?

The code sets no explicit size cap. Since the canvas work runs in your browser, how well very large images perform depends on your device's memory and processing speed.

Why did my file barely shrink or even grow?

That is common with PNG input, which is re-saved losslessly, or with a source that is already highly compressed. For a bigger cut, lower the quality value, and for photos consider a format that ends up as JPEG rather than PNG.

Last reviewed: July 2026

How was this tool?

Related tools