Compress Image
Reduce JPG, PNG and WebP image file size directly in your browser without uploading your files. Improve website performance, email attachments and storage while preserving image quality.
Reduce image file size locally
Upload an image, choose quality and output format, preview the compressed result, then download the optimized file.
Original / Upload
Result / Output
Why compress images?
Image compression reduces the number of bytes needed to store an image. The picture can keep the same width and height while the file becomes easier to upload, download, email and archive. Large camera photos and screenshots often contain more data than a web page, document or message needs. Compressing them before use can make pages feel faster, attachments easier to send and folders simpler to manage.
Compression is especially useful when the visual dimensions are already correct. A 1600 by 900 hero image may fit a website layout perfectly, but the file might still be several megabytes. Reducing the encoded size can improve loading without changing how much space the image occupies on the page.
Difference between compression and resizing
Resizing changes pixel dimensions. If a 4000 by 3000 photo becomes 1200 by 900, the image has fewer pixels. Compression changes how those pixels are stored. The image can remain 1200 by 900 while the encoder removes redundancy or approximates details that are less visible to the eye. Both techniques reduce file weight, but they solve different problems.
Use the Resize Image tool when the image is physically too large for a layout or platform. Use this compressor when the dimensions are right but the file size is too high. In many publishing workflows, the best order is resize first, compress second.
Lossy vs lossless compression
Lossy compression reduces file size by simplifying image data. It is common for JPEG and WebP photos, where small changes are often hard to notice at normal viewing sizes. Lower quality settings can create artifacts around edges, gradients and text, so previewing the result matters.
Lossless compression keeps the original visual information, but browser-based Canvas export does not expose a full set of lossless optimization controls for every format. PNG output may be useful for transparency and screenshots, yet it will not always be smaller than the original. For photos, JPEG or WebP usually gives a better size-to-quality balance.
Best quality settings
80% for everyday use
A quality setting around 80% is a strong starting point for photos, blog images and general web publishing.
60-70% for smaller files
Lower settings can help when email limits, storage or page weight matter more than fine texture detail.
90-100% for visual review
Higher settings preserve more detail, but the final file may remain close to the original size.
Compress images for websites
Heavy images are one of the easiest ways to slow down a page. A large photo can delay rendering, increase bandwidth use and make a mobile visitor wait longer than necessary. Compressing images before publishing helps Core Web Vitals because the browser has less data to download and decode.
Use JPEG for most photographs, WebP when your site supports modern image delivery and PNG for interface graphics or images that need transparency. Keep original files separately, then publish compressed copies that match the page context.
Compress images before email
Email providers and messaging apps often limit attachment size. Compressing images before sending them can avoid bounced messages, slow uploads and oversized threads. It is useful for receipts, screenshots, event photos, school work, client previews and support documentation.
If the recipient only needs to view the image on screen, a moderate JPEG or WebP quality setting is usually enough. If the image contains small text, compare the preview carefully before downloading.
Privacy benefits
This compressor runs locally in your browser. The selected image is decoded, drawn to a temporary Canvas and exported as a new file without being uploaded. That makes it practical for private screenshots, internal notes, draft product images and client files that should not leave your device just to reduce file size.
The preview URLs created by the tool are temporary browser object URLs. Clearing the tool or leaving the page releases them from the current session.
Supported formats
The tool supports JPG, JPEG, PNG and WebP input in modern browsers. You can keep the original format or export as JPEG, PNG or WebP. JPEG is usually best for photos without transparency. PNG is best for sharp screenshots, diagrams and transparent graphics. WebP is often a good web-friendly choice for smaller files at strong visual quality.
The optional metadata checkbox is off by default. When enabled, the tool attempts to preserve common JPEG metadata for JPEG output where browser export allows it. For PNG and WebP, browser encoders may remove metadata during export.
FAQ
Is my image uploaded?
No. The image is processed locally in your browser. MetricLab does not receive the file.
Does compression reduce quality?
It can. JPEG and WebP compression can trade detail for smaller size, especially at lower quality settings.
Can I compress PNG?
Yes. PNG input is supported, though PNG export may not always produce a smaller file than the original.
Can I compress WebP?
Yes. You can upload WebP and export WebP in browsers that support Canvas WebP output.
Which quality should I use?
Start at 80%. If the result is still too large, try 70% or 60% and compare the preview.
Does image size change?
The pixel resolution stays the same. Only the encoded file size and selected output format change.
Is compression reversible?
Lossy compression is not reversible. Keep the original file if you may need maximum quality later.
Does it work on mobile?
Yes. It works on modern mobile browsers with local image decoding and Canvas export support.