Compress Image
Compress JPG, PNG and WebP images to a smaller file size while keeping great quality. Perfect for faster websites and email. Free and fully in-browser — nothing is uploaded.
Drop images here
or click to choose · batch supported · compressed right in your browser
How to use the Compress Image
- 1Drag an image onto the drop zone, or click to pick a JPG, PNG, or WebP file from your device (pasting from the clipboard works too).
- 2Pick an output format: keep the original, or switch a JPG or PNG to WebP to squeeze out extra size at the same visual quality.
- 3Drag the quality slider to trade size against sharpness. Around 75-85 suits photos; keep it higher for anything containing text or fine lines.
- 4Watch the live preview and the before/after file-size readout update in real time to confirm the image still looks good.
- 5Click Compress to run the encoding locally in your browser, then download the optimized file.
- 6Drop in the next image, or re-run at a different quality if you want to push the size down further.
About the Compress Image
Compress Image shrinks JPG, PNG, and WebP files entirely inside your browser tab, so a 4 MB phone photo can drop to a few hundred kilobytes while still looking sharp on screen. It works by reading your file into memory, decoding it to a bitmap, redrawing it onto an HTML5 Canvas, and re-encoding it at the quality level you pick. Every step runs in JavaScript on your own device, which means the file is never uploaded and there is no server that stores or sees it. That is the reason this tool is safe for private screenshots, client mockups, ID scans, or medical images you would never send to an unknown website.
The practical payoff shows up elsewhere. Oversized images are the most common cause of slow-loading pages, so compressing hero shots and thumbnails before you upload them to WordPress, Shopify, or a static site directly improves Largest Contentful Paint and mobile load times. Most email providers cap attachments around 20-25 MB, so trimming a batch of photos keeps them under that ceiling. Marketplaces and forums with strict per-image limits become a non-issue without ever opening Photoshop.
A few tips specific to how this tool encodes. JPG and WebP are lossy, and quality between 70 and 85 usually cuts size dramatically with no visible loss; WebP typically beats JPG by 25-35% at matching quality, so converting a JPG to WebP is often the single biggest win. PNG is lossless, so keep it only for logos, text-heavy screenshots, and anything needing transparency, where lowering quality does almost nothing anyway. Watch the live before/after size readout and the preview image update as you drag the slider, so you commit only when the result still looks right. If it turns soft, nudge quality back up a few points. Because the whole encoder loads with the page and runs locally, you can compress on a plane or a weak connection exactly as you would at your desk. Bloggers, shop owners, portfolio builders, and support teams all use it the same way: drop in, dial quality, download.
Frequently asked questions
Does this change the pixel dimensions or only the file size?
By default it keeps the exact same width and height and only lowers file size by re-encoding at your chosen quality. The dimensions of the downloaded image match the original, so it drops straight into the same layout slot without breaking your design.
Why did my PNG barely shrink, or come out larger?
PNG is lossless, so the quality slider has little effect on it, and photographic PNGs with millions of colors compress poorly. For a photo saved as PNG, convert it to JPG or WebP here instead. Reserve PNG for logos, text screenshots, and images that need transparency.
If I compress the same image twice, does it get worse?
Yes, for the lossy formats. Each JPG or WebP pass throws away a little detail, so re-compressing an already-compressed file stacks up visible artifacts. Always start from the original file and compress once at your target quality rather than re-running the output.
What happens to transparency and EXIF metadata?
Transparency survives if you keep or convert to a format that supports it (PNG or WebP); exporting to JPG flattens it onto a solid background. Canvas re-encoding also drops EXIF data such as GPS location and camera model, which is good for privacy but means a photo relying on an orientation tag may need rotating first.
Is anything uploaded, and is there a size limit?
Nothing is uploaded. The file is decoded and re-encoded in your browser's memory, so there is no server limit and no copy leaves your device. The only ceiling is your own RAM, since the full bitmap is held in memory, so a very high-resolution image may feel slow on an older phone or low-end laptop. Once the page has loaded it also works fully offline.
Related tools
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Frequently asked questions
Will compression reduce quality?+
You control the quality slider. Most images shrink dramatically with no visible loss.
Which formats can I compress?+
JPG, PNG and WebP. You can also convert to WebP for the smallest size.