Compress a JPG image online
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Compress multiple at once — your files never leave your browser
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Large photos slow down websites and blow past upload limits on forms and portals. This tool compresses one or many JPGs at once toward a target size you choose, using iterative quality reduction entirely in your browser, with a before/after preview for each image. It works well for photos and camera images; results vary with how much detail and noise the original image has, since compression is approximate rather than an exact KB guarantee.
Why some photos compress well and others fight back
JPEG compression works by discarding detail the eye is least likely to miss, so how well it performs depends entirely on how much detail your photo contains. A passport-style portrait against a plain wall compresses beautifully — the background is a flat expanse of near-identical pixels that costs almost nothing to store. A photo taken outdoors with foliage, texture, and varied lighting is the opposite: every part of the frame carries detail competing for the same limited budget, so the compressor has to sacrifice quality everywhere including on the face.
Resize before you compress
This is the step most people skip and it does more than compression alone. A modern phone photo is often 4000 pixels wide, while an upload form may display it at 200 pixels. Compressing at full resolution forces the encoder to preserve detail nobody will ever see, then destroys quality trying to hit your size target. Resizing to roughly the dimensions actually needed first means the compressor starts with far less data and can afford much higher quality per pixel. The result at the same file size is dramatically better.
When the source photo is the problem
If an image will not reach your target without visible damage, retaking or re-sourcing it usually beats compressing harder. Cropping a face out of a group photo leaves a busy background that eats the file budget. A photo taken under yellow indoor light carries colour noise across every flat area. Shooting against a plain light wall in indirect daylight, with the subject filling the frame, produces an image that lands under 50KB with quality to spare — the same target that ruins a poorly-sourced photo.
Frequently asked questions
- Will my photo look worse after compressing?
- Some quality loss is expected — JPG compression is lossy. The tool balances quality against your target size, but very aggressive targets will show visible artifacts.
- Can I hit an exact target size?
- The tool gets as close as possible to your target through iterative quality reduction, but it's approximate, not guaranteed exact.
- Can I compress multiple photos at once?
- Yes, drop in several JPGs and each one is compressed toward the same target size, with its own before/after preview and download button.
- Are my photos uploaded to a server?
- No, compression happens locally in your browser. Nothing is sent anywhere.
- What image formats are supported?
- This tool accepts JPG/JPEG files. For PNG, use the dedicated PNG compressor so transparency is handled correctly.
- Why does my photo look blocky after compressing?
- That is JPEG artefacting from pushing quality too low, usually because the image was compressed at full camera resolution. Resize to the dimensions you actually need first and the same file size will look far cleaner.
- Can I compress the same photo twice?
- You can, but it is a bad idea. Each pass discards detail permanently, so compressing an already-compressed image degrades it further. Always start from the original.