Image Compressor Online Free Tool
Compress JPG, PNG, WebP, or GIF images - adjust quality, resize, and pick the output format. Free, client-side, instant, offline, secure.
Drop a JPG, PNG, WebP, or GIF and shrink it in the browser — adjust quality, resize, and pick the output format without uploading a single byte.
Click, drop, or press Enter to upload
JPG · PNG · WebP · GIF — processed entirely in your browser
How to Use Image Compressor Online Free Tool
- Drop your image onto the upload zone, click it to browse, or focus it with Tab and press Enter. JPG, PNG, WebP, and GIF are accepted. The original and compressed previews appear side-by-side as soon as the file is decoded.
- Pick the output format: Auto keeps the input's format (GIF falls back to JPEG because canvas cannot encode GIF). Choose JPEG or WebP for aggressive lossy compression, or PNG when you need lossless output.
- Drag the Quality slider between 1 and 100. For JPEG and WebP it controls the lossy encoder directly. For PNG the slider is ignored - PNG is lossless and only resizing will shrink the file.
- Slide Resize to shrink the pixel dimensions between 10% and 100%. The aspect ratio is preserved and the canvas uses high-quality smoothing, so downscales stay sharp.
- Read the stats line underneath the previews - it reports the original bytes, the compressed bytes, savings percentage, the new dimensions, and the output format.
- Copy or Download. Copy writes the compressed image straight to your system clipboard (
ClipboardItem) - if the browser does not support it, the data URL is copied as text instead. Download saves a file named<original>-compressed.<ext>. - Press
Ctrl+Enter(or⌘+Enteron Mac) to force a fresh compress pass. Clear wipes the file and previews; Reset options returns the sliders to defaults without losing the image.
Frequently asked questions
Is my image secure and private?
Yes. Compression runs entirely in your browser on an HTML canvas – the image bytes are never uploaded, cached, or tracked. After the page loads you can disconnect from the network and the tool still works.
Is this image compressor free?
Yes, 100% free with no cap on how many images you can compress. No sign-up, no watermark, no hidden file-size limit.
Does this work offline?
Yes. HTML, CSS, and JavaScript are self-contained. After the first page load you can turn off Wi-Fi and keep compressing indefinitely.
Which image formats are supported for input and output?
Input accepts JPG/JPEG, PNG, WebP, and GIF. Output can be JPEG, PNG, or WebP – the Auto setting keeps the input’s format except for GIF, which browsers cannot re-encode, so it is converted to JPEG automatically.
How much smaller will my file be?
It depends on the image. A quality of 70-80 typically shrinks photos by 50-80% with little visible loss, and the resize slider compounds the savings. The stats line shows the exact before / after bytes and a savings percentage so you can dial in the trade-off.
What quality should I use?
For web or email, 70-80 is the sweet spot. For print or archival, 90+ preserves fine detail. For aggressive web optimisation, try 50-60 and watch the preview – if you cannot spot artifacts at the target viewing size, use it.
Can this tool resize images too?
Yes. The Resize slider scales both dimensions between 10% and 100% while preserving the aspect ratio. Combined with Quality, a single pass can both shrink the pixel count and recompress – which often produces much smaller files than quality alone.
Can I compress many images at once?
Not in this UI – it processes one image at a time so the side-by-side preview stays meaningful. Compression itself is fast (typically well under a second on a modern laptop), so working through a folder by drag-dropping one file at a time is still quick.
What is the largest image I can compress?
There is no fixed cap – it is governed by your browser’s canvas memory. Most modern browsers handle images up to 32 megapixels without trouble. Very large inputs may take a second or two to decode, and the Recompress button shows “Compressing…” while it works.
Does compression affect image metadata?
Yes. Canvas re-encoding strips EXIF metadata (camera model, GPS coordinates, edit history). That is a privacy upside – it prevents accidental leaks of location or device details when you share the file.