How do I compress a JPG?

Add the JPEG and start with the slider at 80. That position is canvas quality 0.80, because JPEG uses the slider number divided by 100. Look at the preview, especially faces and open sky, and move the control only while the picture still looks right. If the new file is smaller, download it. If it is the same size or larger, you keep the original. The pass stays on your device, and the result stays a JPEG.

What does the starting value of 80 change?

The range is 1 to 100, and 80 is where it opens. Divided by 100, 80 becomes 0.80 for the JPEG encode. Higher numbers stay nearer the photo you brought. Lower numbers push the weight down and spend detail to do it. There is no universal best spot, so use 80 as a first look, then judge the picture at the size you will publish. A proof for a client often stays higher. A chat image can go lower once you have checked it.

Why did I get my original JPEG back?

The tool keeps the smaller of the two files. When the new encode is the same size or heavier, the original is returned, which protects you from a download that made things worse. It is common with a JPEG that was already saved at a tight quality. Try a lower position on the range and look again. If the picture suffers before the weight drops, the camera file is telling you it has little room left, and a smaller pixel size may help more than another encode.

Does a PNG belong on this page?

This page is the JPEG path. A PNG stays a PNG, and that work has its own page, because the way a PNG gets smaller is different from a JPEG quality fraction. Bring .jpg or .jpeg files here. WebP also uses quality divided by 100 on the compressor, and it is still a WebP when it leaves. If your screenshot is full of type, the PNG page is the kinder place for it. A photograph from a camera is the file this slider was meant to lighten.

Should I compress the same JPEG twice?

Prefer one pass from the camera original. Each extra save spends a little more detail, even when the second file is smaller. If the first download is still too heavy, go back to the original, choose a lower position, and export again. When the long edge is the real problem, resize the pixels first and encode once from that result. Keep the untouched JPEG in an archive so you can always start over.

Where should I set the slider for email?

Begin at 80 and look at the faces. If the message still rejects the attachment, move downward in small steps and preview each time. The encode uses that number divided by 100, so you can tell what you asked for. Download only when the new JPEG is smaller and still looks acceptable at the size the recipient will open. The original remains yours if a try fails to shrink the file. One clear photo is kinder than a tiny file nobody can read.

Image Compression Guide

Compress JPG: a lighter photo from the quality slider

Bring a camera JPEG down to a friendlier weight, starting at 80 on the slider, and keep the file a JPEG.

JPEG compression starts at 80 on a 1 to 100 slider, which is canvas quality 0.80. If the new file is not smaller, you keep the original.

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Written by Safaat Rahman Siham, Founder & Developer at Convertify4u. Contact us.

A camera JPEG is often heavier than the email, the form, or the page can comfortably carry. A gentle re-encode gives you a lighter copy you can actually attach, while the picture stays a JPEG. Open the photo in this browser. The control is a slider from 1 to 100, and it begins at 80. For a JPEG, that number is divided by 100 and handed to the canvas as the quality, so the starting point is 0.80. Move it after you look. A higher position stays closer to the file you brought. A lower position asks for a smaller result and will show its cost first in smooth skies, fine hair, and any type that happens to be inside the photograph. The download is a JPEG. WebP uses the same kind of quality math on its own files, and a PNG keeps a different page because a PNG stays a PNG. Here the subject is the .jpg or .jpeg you already have. If the new encode is smaller, that is the file you take. If it is the same size or larger, you keep the original, so a try that fails to help does not replace a lighter camera file with a heavier one. Everything in this pass stays on your device. Keep the camera original in a folder you trust, and send the lighter JPEG. One pass is enough for most photos. If the picture is still too large because it is simply huge in pixels, change the dimensions on the resizer and encode from the original again, rather than stacking save after save on the already compressed download. Look at faces at the size people will see. A setting that looks fine as a thumbnail can look tired full screen. Stop while the photo still looks like the afternoon you photographed.

A second save that knows when to stop

JPEG is already a lossy photograph. This page makes another JPEG from it, using the slider as a quality fraction. The useful promise is practical: you can get a smaller file, and you are handed back the starting file whenever the new one fails to shrink.

How it works

1
Add the JPEG
Bring the .jpg or .jpeg you want to lighten. The pass runs on your device, and the slider is already sitting at 80.
2
Move only as far as the picture allows
80 means canvas quality 0.80. Preview faces and skies, then nudge the control if you still need less weight.
3
Keep the smaller result
Download the new JPEG when it is actually smaller. When it is not, the original is what you get back.

Use cases

A camera dump that will not attach

Start at 80, look at the preview, and take the lighter JPEG into the email once the faces still look like themselves.

A web hero that is merely heavy

Stay high on the range if the photo is a large feature, and drop further only after you have seen the sky and the edges.

A JPEG that barely changes

If the new file is not smaller, you still have the original. Try a lower position, or resize the pixels first and encode again from the camera file.

Problems we solve

Blocking in the sky

You have moved too far down the range. Return toward 80 or above and export again from the original JPEG.

Type inside the photo looks muddy

JPEG softness shows on lettering. Keep the setting high, or move a screenshot to the PNG page where the file can stay a PNG.

The download got bigger

You keep the file you started with. A JPEG that was already compact often behaves this way at 80.

Image tool ecosystem

Pair our image compressor with Convertify4u converters when you need to normalize HEIC assets or clean a backdrop before you compress image exports.

Related guides

Trust, speed & privacy

Encoded where the photo already is

The slider and the comparison both run in the tab. You decide which JPEG to keep after you see the size.

A heavier try does not replace the original

The download is the new JPEG only when that file is smaller. Otherwise the first file comes back.

Frequently asked questions

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