Image Compressor
Drop a JPG, PNG, or WebP, drag the quality slider, and watch the file shrink in real time. This image compressor reduces file size right inside your browser and shows the original size, the new size, and exactly how much you saved before you download. The picture is never uploaded, so private screenshots, logos, and client mockups stay on your device.
Drop an image here
or choose a file · or paste with Ctrl+V (Cmd+V)
🔒 Compressed in your browser with a canvas. Never uploaded.
What is the Image Compressor?
This is a free, browser-based image compressor that makes pictures smaller without sending them anywhere. You drop in a JPG, PNG, or WebP, choose a quality level, and the tool re-encodes the image and reports the original size, the compressed size, and the percentage saved. It is built for the everyday job of getting a photo under an upload limit, speeding up a web page, or trimming an email attachment — fast, with no account and no watermark. Every step runs on your device, so the image is never uploaded, stored, or logged.
How to use it
- Add your image — click to choose a file, drag and drop it onto the drop zone, or paste with Ctrl+V (Cmd+V on Mac).
- Drag the quality slider. Lower quality means a smaller file; the size and savings update as you move it.
- Pick an output format: JPEG for the widest compatibility, or WebP for the smallest file at the same look.
- Check the before-and-after sizes, then click Download. Answer in, answer out, done.
The method behind it
The tool decodes your image, draws it onto an HTML <canvas> at its native
resolution, then calls canvas.toBlob(mime, quality) to re-encode it. The
quality argument is a number between 0.1 and 1.0 that is handed straight to the
browser's built-in JPEG or WebP encoder. Both formats are lossy: they save space by
discarding fine high-frequency detail the eye barely notices, and they discard more of it as
the quality number drops. Because the encoder is the same one the browser ships, the result
is exactly what a browser would render — no proprietary algorithm, no server round trip. The
compressed bytes are produced as a Blob, which we turn into a download link and a preview.
Examples
- A 4.2 MB phone photo exported as JPEG at quality 0.7 drops to roughly 850 KB — about an 80% saving — while still looking sharp on screen.
- A 1.1 MB PNG screenshot re-encoded as WebP at quality 0.8 lands near 180 KB, because WebP handles flat UI colors far more efficiently than PNG.
- A logo that is already a tiny, tightly compressed JPG may come out slightly larger at quality 1.0 — the tool shows the negative saving so you simply lower the slider.
Common use cases
- Shrinking photos to fit a form's upload size limit (job portals, government sites, marketplaces).
- Making web images lighter so pages load faster and score better on Core Web Vitals.
- Trimming email attachments and chat images that would otherwise bounce or send slowly.
- Compressing screenshots and mockups before sharing them with a client or team.
Why use this one
Most online compressors upload your file to their server first. This one does not — the image is processed entirely in your browser with a canvas, so it never leaves your device. You also get a live before-and-after size readout instead of a vague "compressed" badge, a real WebP option for smaller files than JPEG, and no watermark, sign-up, or daily limit. Close the tab and nothing remains.
It is part of a small image toolkit. To change pixel dimensions, use the Image Resizer; to turn screenshots into smaller photos, try PNG to JPG; to keep just the region you want, reach for the Image Cropper; and to inline a graphic in code, use Image to Base64.
Frequently asked questions
Is my image uploaded to a server?
No. The image is decoded, redrawn onto a canvas, and re-encoded entirely inside your browser. It is never sent over the network, never stored, and gone the moment you close the tab. That makes it safe to compress private screenshots, client mockups, and internal logos without sending them to a third party.
What does the quality slider actually do?
The slider sets the lossy quality factor passed to the browser's JPEG or WebP encoder, from 0.1 (smallest, most artifacts) to 1.0 (largest, near-original). Lower quality throws away more high-frequency detail to save bytes. Dragging it re-encodes the image and updates the new size and savings percentage so you can find the sweet spot by eye.
Should I export as JPEG or WebP?
WebP usually produces a noticeably smaller file than JPEG at the same visual quality and is supported by every modern browser, so pick it for the web when you can. Choose JPEG for the widest compatibility, such as email attachments or older software. The tool lets you switch formats and compare the resulting size instantly.
Does compressing lose quality?
JPEG and WebP are lossy formats, so re-encoding always discards some detail, with more loss at lower quality settings. The live preview shows the compressed result side by side with the original size so you can judge the tradeoff before downloading. Keep a copy of your source file if you need to re-export later.
Why did my file get bigger instead of smaller?
If the source is already tightly compressed, or you set quality near 1.0, re-encoding can add bytes rather than remove them. The tool reports a negative savings figure honestly when that happens. Lower the quality slider or switch to WebP and the size usually drops well below the original.