What is the Image Compressor & Resizer?
An image compressor reduces a picture's file size so it loads faster, sends quicker, and fits upload limits. This matters everywhere: a 5 MB phone photo slows a webpage, fails a 10 MB email attachment, and eats mobile data. Modern compression — mainly smarter lossy encoding — can cut 50 to 80 percent of a photo's weight with no difference your eyes can spot, which is why it is a staple step before publishing anything.
On BConvert, compression runs completely in your browser. Drop in a JPG, PNG, or WebP, move the quality slider while watching the before-and-after file sizes, and optionally resize the dimensions at the same time. Nothing is uploaded, so you can safely compress client photos, product shots, and personal images without them ever leaving your device.
How to use it
- Add your image — Drop your image into the tool or click to browse. JPG, PNG, and WebP files are all supported.
- Set the quality — Move the quality slider to balance file size against visual quality — 80 percent is a safe starting point for photos.
- Resize dimensions — Optionally set new width or height values to resize; aspect ratio stays locked so nothing gets stretched.
- Preview the result — Compare the before-and-after file sizes and preview the result to confirm the quality still looks right.
- Download the file — Download the compressed image instantly. It is ready for your website, email, or upload form.
Common use cases
- Compress hero images before uploading to a blog so pages load in under two seconds on mobile.
- Shrink phone photos to fit a 10 MB email attachment limit without having to send a zip file.
- Resize product photos to a store's required dimensions so they upload without being rejected.
- Reduce a folder of portfolio images so your site passes Core Web Vitals on image-heavy pages.
Tips
- Compress after resizing, not before — shrinking dimensions first gives the compressor less data to work with.
- For line art, logos, and text screenshots, PNG compresses cleaner than JPG at small sizes.
- Watch for banding in gradients at low quality; raise the slider if skies or backgrounds look striped.
- Keep the original file — compression is one-way, so archive masters before replacing them.
Frequently asked questions
How much can compression shrink an image?
Photos typically shrink 50 to 80 percent at quality 80 with no visible difference. PNG screenshots with flat colors can shrink even more when converted thoughtfully.
Will resizing change my image's proportions?
No — the aspect ratio is locked by default, so entering a new width automatically adjusts the height. Unlock it only when you truly need to change proportions.
Is my image uploaded to a server?
Never. The file is decoded, compressed, and re-encoded inside your browser, so private photos and client work stay entirely on your device.
Which format gives the smallest file?
WebP usually wins for photos at equal quality, often 25 to 35 percent smaller than JPG. Use JPG only where WebP is not accepted.