Compress Image
Reduce image file size while keeping it looking great. Adjust quality vs. size and see the estimated output size in real time — all in your browser.
Drop an image here
or choose a file
JPEG, PNG, WebP, AVIF, GIF, BMP, TIFF, SVG, HEIC and HEIF — up to 150 MB
About image compression
Compressing an image means re-encoding it so the file takes up less disk space, without changing its dimensions. Most of the file size in a photo comes from how precisely the encoder records color and detail — turn that precision down a little, in a way the human eye barely notices, and the file can shrink by half or more. Pixuno's compressor uses your browser's own built-in image encoder (the same one behind the Canvas API) to do exactly that, with a quality slider that lets you see the trade-off in real time instead of guessing.
The format you choose matters as much as the quality setting. JPEG is still the safest default for photos — broad support, predictable results, and quality 75–80 typically cuts file size by 50–70% compared to quality 100 with no visible loss on screen. WebP usually does better still at an equivalent visual quality, often 25–35% smaller than JPEG, and is now supported by every major browser. PNG is different: it's a lossless format, so the quality slider won't shrink it much — if you're starting from a PNG and want a real size reduction, convert to WebP or JPEG first with Pixuno's Convert tool.
A common real-world case: a phone camera photo comes out of the camera at 4–8 MB, but most websites, forms and email attachments cap uploads well below that. Compressing to quality 75–85 on JPEG or WebP will usually bring a photo like that under 1 MB while still looking sharp on a normal screen — the same approach whether you're prepping a product photo for an online shop, shrinking a screenshot before pasting it into a doc, or just trying to get under an email attachment limit.
How it works
Drop in an image
Open a JPEG, PNG or WebP file — from your device, or dragged straight onto the page.
Pick a format and quality
Choose the output format and drag the quality slider. The estimated output size updates live as you move it.
Download the result
Save the compressed file straight to your device. Nothing was ever sent anywhere to get there.
Why use this tool?
Private by default
The image is decoded and re-encoded locally in your browser. It's never uploaded, so there's no server-side copy to worry about — even for sensitive photos.
Fast, no queue
No upload, no processing queue, no waiting on someone else's server. Compression happens as fast as your own device can encode the image.
You control the trade-off
A live quality slider with a real-time size estimate means you're not guessing — you can see exactly how far you can push compression before quality suffers.
FAQ
How much can I reduce the file size?
This depends on the format and the image content. JPEG images at quality 75–80 are typically 50–70% smaller than quality 100. WebP at equivalent quality can be even smaller.
Will compression reduce the image dimensions?
No. Compression only reduces the encoded file size. The image dimensions (width × height) remain unchanged — use the Resize tool if you also want to change dimensions.
Can I compress PNG files?
PNG is a lossless format, so the quality slider does not reduce file size much for PNG output. For significant size reduction from a PNG, convert to WebP or JPEG.
What quality setting should I use for web images?
Quality 75–85 is a good range for web images. At these settings, the visual difference from the original is minimal while the file size reduction is significant.
Does compressed quality look different on every screen?
Compression artifacts are most visible when an image is zoomed in or printed large. At normal web/social sizes and quality 75+, most compression is imperceptible on typical phone and laptop screens.
Is there a limit to how many times I can compress the same image?
There's no limit, but re-compressing an already-compressed JPEG repeatedly will gradually degrade quality (each pass re-encodes the existing artifacts). For the best result, always compress from the original, uncompressed source if you still have it.