Compress JPG
Make JPG, JPEG and PNG photos smaller in seconds, without uploading a single file.
Your files never leave your device
or drop JPG / PNG images here, or paste with Ctrl+V
JPG, JPEG, PNG, WebP · up to 50 images · 50 MB each
Drag the slider to compare. Zoomed preview shows the centre of the image at full resolution.
Big photos slow down websites, fill up email attachments and get rejected by upload forms that cap files at 1 or 2 MB. This free JPG compressor makes JPG, JPEG and PNG images smaller in seconds, and it does it without uploading anything. Every image is processed by your own browser, on your own device.
Your files never leave your device. This Compress JPG tool runs 100% in your browser. There are no uploads, no accounts and no watermarks, and there is no tracking inside the tool.
How to compress a JPG online
- Add your images. Click Select images, drag photos onto the box, or paste a screenshot with Ctrl+V. You can add up to 50 JPG, JPEG, PNG or WebP files at once.
- Choose quality and size. Move the Quality slider (75 is a good starting point) and, if you want, pick a Max width or height such as 1920 px. Every image is re-compressed instantly as you change a setting.
- Check the result. Each file shows its old size, new size and the percentage saved. Tap a thumbnail and drag the before/after slider to compare quality, or tick “Zoom to 100%” to inspect fine detail.
- Download. Use the download arrow next to any image, or Download all (ZIP) to save every compressed photo in one file.
What this image compressor can do
Why private, in-browser compression matters
Most online compressors upload your photos to a remote server, process them there and ask you to trust that the copies are deleted later. That is a real concern for ID scans, family pictures, medical documents or unreleased work. This tool takes a different approach: the page loads once, and from then on your images never leave your device. Your browser decodes each photo, draws it onto an invisible canvas and saves it again as a JPEG at the quality you picked.
There is a second privacy bonus. Phone cameras store hidden EXIF data in each photo, which can include the exact GPS location where it was taken, the date and the device model. Because the compressed copy is a freshly encoded image, that metadata is not carried over. If you share the compressed file, you share the picture and nothing else.
How JPG compression works (in plain English)
JPEG is a lossy format. It splits a picture into small 8×8 pixel blocks and stores the broad shapes and colours of each block very accurately, while saving fine texture and subtle colour changes more roughly. The quality setting controls how much of that fine detail is kept. At high settings the savings are modest; at middle settings the file shrinks a lot while the photo still looks almost the same to the eye; at very low settings you start to see blocky squares, smudged edges and “halo” artefacts around text.
The other lever is resolution. A modern phone photo can be 4000×3000 pixels (12 megapixels) or more, but a blog post or a chat preview rarely shows it wider than 1200–2000 pixels. Halving the width and height leaves a quarter of the pixels, so the file usually becomes much smaller before quality is even touched. This tool downsizes in high-quality steps to keep edges smooth.
| Use | Suggested quality | Suggested max size |
|---|---|---|
| Website or blog photo | 70–80 | 1600–1920 px |
| Email attachment | 65–75 | 1280–1600 px |
| Upload form with a 1 MB limit | 60–75 | 1280 px |
| Printing or further editing | 88–95 | Keep original |
| Thumbnails and previews | 55–70 | 640–800 px |
These are starting points, not rules. Photos with lots of fine detail, such as grass, hair or fabric, need a slightly higher quality than smooth skies or plain walls. The before/after slider is the best judge.
Tips for the smallest files
- Resize first. If you know where the image will be shown, pick a matching maximum size. It saves more than lowering quality.
- Avoid compressing the same file again and again. Each round of lossy compression loses a little more detail. Keep your original and always compress from it.
- Use JPG for photos, PNG for graphics. Screenshots full of text, logos and flat illustrations can look worse as JPG. Compress photos here, and keep simple graphics as PNG.
- Check the percentage. If a file only gets a few percent smaller, it was already well optimised. Lowering quality further will cost detail for little gain.
- Work in batches on phones. Large photos are decoded in memory. On older devices, 10–20 images at a time is smoother than 50.
Limits and honest notes
The compressor uses your browser’s own JPEG encoder, so results can differ slightly between Chrome, Safari and Firefox. Animated GIFs become a single still JPG. CMYK JPEGs from print workflows are converted to standard RGB. If you need lossless optimisation that keeps every pixel identical, a desktop tool is a better fit. For everyday photos, a quality setting in the 70s gives large savings that most people never notice.
Frequently asked questions
Is this JPG compressor really free?
Yes. There is no sign-up, no watermark and no daily limit. The tool is a small piece of JavaScript that runs in your browser, so it costs nothing to run for each extra image.
Are my photos uploaded to a server?
No. The images are read, compressed and saved entirely on your device using your browser’s built-in canvas engine. Nothing is sent to WorldScope or anyone else, and the tool keeps working if you go offline after the page has loaded.
What quality setting should I use?
For photos on websites, social media or email, a quality between 65 and 80 usually gives a much smaller file with little visible difference. Use 85–92 for photos you may print or edit again, and lower values only when file size matters more than detail.
Why did one of my files get bigger?
An image that was already heavily compressed, or a simple graphic, can grow when it is re-encoded. With “Keep the original if compressing would make it bigger” ticked, the tool simply gives you the original JPG back in that case.
Can I compress PNG files too?
Yes. PNGs are converted to JPG, which is usually far smaller for photos. JPG has no transparency, so transparent areas become white. For logos and icons with sharp edges, PNG may still be the better format.
Does compressing remove EXIF data and location?
Yes. Re-encoded images do not keep EXIF metadata such as camera details or GPS location, which is good for privacy when you share photos. Embedded colour profiles are also dropped and colours are saved as standard sRGB.
How many images can I compress at once?
Up to 50 images per batch, each up to 50 MB. Very large photos use a lot of memory, so on older phones it is faster to work in smaller batches.
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By Abdullah Al-Janoubi · WorldScope Tools · Updated October 2026
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