Image Compressor
Shrink JPG, PNG and WebP photos right here in your browser with a quality slider and before/after sizes. Your image never leaves your device.
Result
How can a website compress images without uploading them?
Modern browsers include a full image-processing pipeline. This tool uses the HTML5 <canvas> element: your photo is drawn onto an invisible canvas on your own device, optionally scaled down, and re-encoded as a JPEG at the quality you choose. The file input, the pixels and the output blob all live in your browser's memory — nothing is uploaded, ever. You can disconnect from the internet after the page loads and the compressor keeps working, which is also why it is safe for private photos and documents.
How to use it
Pick an image, then adjust the quality slider and maximum width — the result recompresses live, showing the original size, the new size, the percentage saved and a preview. Download when you are happy. The 1920 px default width is ideal for web use and email; keep "original size" if you only want quality-based compression.
What actually shrinks the file
Two levers work together. Resizing is the big one: a 4000×3000 phone photo has 12 million pixels, but a 1920-wide version has ~2.8 million — a 76% reduction before compression even starts. The quality slider then controls JPEG's lossy encoding, which discards visual detail your eye barely notices. Transparent PNG areas are flattened onto white, since JPEG has no transparency.
Worked example
A 4.2 MB photo from a phone camera (4032 × 3024) needs to go on a job application portal with a 500 KB limit. With max width 1920 and quality 75%, the output lands around 320 KB — a 92% saving — at 1920 × 1440, still crisp on any screen. For a WhatsApp display picture or website avatar, 800 px at 70% often lands under 80 KB.
When is this useful?
Government and university portals with strict upload limits (job applications, admission forms, visa documents), emailing photo batches, speeding up your own website (large images are the #1 cause of slow pages), and saving storage or bandwidth on limited data plans. For documents destined for print, keep quality at 85%+ and avoid resizing below 1600 px. If you also produce invoices for clients, the invoice generator pairs nicely with compressed logos.
Frequently asked questions
Is my image really not uploaded anywhere?
Really. Compression runs on your device using the browser's canvas API. You can verify: load the page, turn off your internet connection, and the tool still compresses. We never see your images.
Why is the output always JPG?
JPEG gives the best size-to-quality ratio for photos and is accepted by virtually every portal and platform. Transparent areas from PNGs are flattened onto a white background.
What quality setting should I use?
70–80% is the sweet spot — files shrink by 60–90% with virtually no visible difference. Go higher (85–95%) for printing; lower (40–60%) only when a strict size limit forces it.
Will compressing reduce my photo's dimensions?
Only if the image is wider than your selected maximum width. Choose 'Keep original size' to compress purely by quality without any resizing.
Can I compress multiple images at once?
This version processes one image at a time to stay simple and fast. Repeat the choose-adjust-download cycle for each photo.