Compress Images Online — Free & Private
Shrink JPEG, PNG and WebP files by up to 90% with a quality slider, a live before/after comparison and batch processing — all on your device.
Drag & drop your images here
or click to browse — several files welcome, pasting works too
Guide & tips for this tool
What this image compressor does
This free image compressor reduces the file size of JPEG, PNG and WebP pictures directly in your browser. There is no upload button hiding a server round-trip: the moment you drop a photo into the box above, it is decoded by your own device, re-encoded with the settings you choose, and handed straight back to you as a smaller download. That makes the tool fast even on slow connections, and it means your personal photos, client work and screenshots stay exactly where they belong — with you.
How to compress an image
Drag a picture onto the drop zone (or click to browse, or paste one straight from your clipboard). Then move the quality slider and watch the compressed size update instantly. The before/after slider lets you drag across the image to inspect artifacts at any point, so you can find the sweet spot between size and sharpness instead of guessing. When you are happy, hit the download button. You can also drop several files at once: every file is processed with the same settings and each gets its own download button in the results list.
How lossy compression actually works
JPEG and WebP are lossy formats: they save space by discarding detail the human eye barely notices, such as subtle high-frequency color variation. A quality setting of 80 usually cuts a photo to a third of its original weight with no visible difference, while settings below 40 start to show blockiness around edges. PNG works differently — it is lossless, so the slider is hidden for PNG output and savings come only from the encoder's built-in optimization. If you need the smallest possible result for a photograph, converting to WebP at quality 75–85 typically beats an equivalent JPEG by another 25–30%.
Why compress images at all?
Smaller images load faster, rank better in search engines, cost less bandwidth to serve, and slip under email attachment limits. A single uncompressed smartphone photo can weigh 8 MB; compressed properly it fits into a few hundred kilobytes. Whether you are preparing pictures for a website, a marketplace listing, a form with a strict size cap, or a messaging app, this tool gets you there in seconds — privately, for free, with no watermarks, accounts or daily limits.
Frequently Asked Questions
Are my images uploaded to a server?
No. All compression is done by your browser using the HTML Canvas API. You can even disconnect from the internet after the page loads and the tool keeps working.
Which formats can I compress?
You can drop in any image your browser can open — JPEG, PNG, WebP, GIF, BMP or AVIF — and export the result as JPEG, WebP or PNG, or keep the original format.
What quality setting should I use?
For photos, 75–85 is the sweet spot where savings are large but artifacts are invisible. For web graphics with text or sharp edges, stay above 85 or use PNG.
Why did my PNG get bigger after compression?
PNG is lossless, so re-encoding a photo as PNG usually increases its size. Switch the output format to WebP or JPEG for photographs; keep PNG for graphics that need transparency.
Can I compress multiple images at once?
Yes. Drop or select several files together. Each one is compressed with the same settings and listed with its own download button.
Is there a file size limit?
There is no hard limit because nothing leaves your device. Files above 40 MB trigger a warning because very large images can be slow to process on older hardware.
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