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Compress JPEG

Shrink JPG photos for websites, email and sharing. MozJPEG compression usually saves 50–80% with no visible difference, and you can compare before and after.

Compress by
Level

Big savings with no visible difference for most images.

Smaller dimensions are the biggest saving for large photos.

How JPG compression works here

JPG photos are re-encoded with MozJPEG, an improved JPEG encoder from Mozilla that packs the same visual quality into fewer bytes than standard encoders. The result is an ordinary JPG that opens everywhere. If a photo is already well optimised and cannot get smaller without visible loss, the original is kept.

Which level to choose

LevelJPG and WebPPNGGood for
SmallestQuality 6064 coloursThumbnails, previews, chat
BalancedQuality 75256 coloursWebsites, email, social media (default)
Best qualityQuality 85LosslessPortfolios, print proofs, archives

Use Compare on any image to drag between the original and the compressed version before you download.

Getting the smallest files

  • Resize large photos. A 12-megapixel phone photo is about 4000 pixels wide; a website rarely shows images wider than 1920. Setting a maximum size is often the single biggest saving.
  • Use the right format. Photos belong in JPG or WebP; screenshots, logos and graphics with flat colours in PNG. WebP is typically 25–35% smaller than JPG and works in all current browsers.
  • Compress from the original. Each round of lossy compression loses a little more detail.

Private by design

Compression runs in your browser using WebAssembly versions of MozJPEG, libwebp and OxiPNG, the codecs behind Google’s Squoosh (licences). Your images are never uploaded. Compressed files are saved without EXIF metadata, so camera details and GPS location are not shared.

Common mistakes

  • Saving photos as PNG

    A photo saved as PNG is often five to ten times the size of a good JPG with no visible benefit. Choose JPG or WebP under "Save as".

  • Compressing a screenshot as JPG

    Text and sharp edges in screenshots blur and ring as JPG. Keep screenshots as PNG; the palette compression here shrinks them just as much.

  • Squeezing a huge photo into a tiny file

    A 4000-pixel photo at 50 KB looks blocky. Reduce the pixel size first (the File size mode does this for you) and the result stays clear.

Frequently asked questions

How much smaller will my JPG get?

Photos straight from a phone or camera usually shrink by 50–80% at the Balanced level. JPGs that were already compressed by a website or messaging app shrink less; if a file cannot be made smaller without visible loss, the tool keeps the original.

What is MozJPEG?

An improved JPEG encoder from Mozilla. It produces files around 10–40% smaller than a standard encoder at the same visual quality, and the files open in every app and browser like any other JPG.

Does compressing a JPG again lose quality each time?

A little, so compress from the original photo rather than from an already compressed copy, and keep your originals.

Is the photo’s location removed?

Yes. The compressed file is saved fresh without EXIF metadata such as GPS location and camera details, which is safer for photos you share publicly.

Are my photos uploaded?

No. Compression runs entirely in your browser. Your photos never leave your device.

Last reviewed 2 October 2026. This tool runs in your browser; nothing you enter is stored or sent to Boostlix.