Compress and convert images in your browser

How to compress and convert images

1. Add your photos. Drag them onto the tool, or tap it to pick them from your device. You can add as many as your device can handle.
2. Pick a format. Keep the format you have, or switch to JPG, PNG, WebP or AVIF. If you are not sure, the formats guide below explains the choice.
3. Choose quality and size. Pick a preset: smaller file, balanced or sharper picture. Use the slider for fine control. To make the picture smaller on screen, set the longest side in pixels or a percent.
4. Wait a moment. The photos are processed on your device, one after another or a few at a time. AVIF takes longer than the other formats, especially on a phone.
5. Compare before and after. Open the comparison to see the two versions side by side. Drag the slider or use the buttons to flip between them.
6. Download. Save one file, or save everything at once as a single ZIP file.

JPG, PNG, WebP or AVIF: which one should you pick?

All four formats hold a picture. They differ in how small the file gets, what kinds of pictures they suit, and where they open. If you only want an answer, use JPG for photos you share widely and WebP for photos on your own website.

Whatever you pick, keep your original photos somewhere. A converted copy is for sharing and publishing, not for storage.

Quality: lossy, lossless and what the controls do

Lossy means the file gets smaller by throwing away detail your eye is unlikely to miss. JPG, WebP and AVIF can work this way. Lossless means nothing is thrown away, so the file only gets smaller if it can be packed more cleverly. PNG is lossless, which is why it has no quality setting here.

The three presets are a quick way to choose. Smaller file keeps the size down and accepts a softer picture. Balanced is the middle road and a good place to start. Sharper picture keeps more detail and gives a larger file. The slider lets you set the level yourself. Move it, then use the comparison to check the result with your own eyes.

• Photos often shrink a lot, but results vary from picture to picture.
• Busy, detailed photos shrink less than plain ones.
• Going down in quality again and again on the same file adds up. Start each time from the original.

Why did my PNG screenshot not shrink? A PNG is already stored without waste, and screenshots are often packed well to begin with. When you keep the format and the new file is not smaller, the tool offers you the original and says it is already well optimized. To get a real saving, switch to WebP or JPG, or make the picture smaller with the size setting.

Limits: how many photos, how big

We set no cap on the number of files and no cap on file size. The real limit is your device's memory. A photo has to be unpacked into raw pixels to be worked on, and that takes far more room than the file on disk suggests.

To stay within that limit, the tool works on one photo at a time on phones, and on two or three at a time on computers. A big batch simply takes longer.

A very large photo, tens of megapixels, can fail on a phone because the phone runs out of memory. If that happens, shrink it first: set the longest side to something like 3000 pixels, or use a percent. Then run it again.

Privacy: your photos stay on your device

The work happens inside your browser. Your photos are not uploaded to us or to anyone else, and file names and file sizes are not sent anywhere.

You do not have to take our word for it. To check yourself, open your browser's developer tools and go to the Network tab. Then add some photos and watch the list. You will see the page's own files loading, and no upload carrying your pictures.

The page needs to load when you open it, so an internet connection is needed to get here. After that, your photos never leave your device.

Metadata: what a photo file says about you

A photo file carries more than the picture. Hidden inside can be:

• The GPS location where it was taken.
• The phone or camera model.
• The date and time.
• The editing software used.
• The color profile.

Posting a photo with its location still inside can show where you live or work. The new file this tool makes has all of that removed. Rotation is applied first, so photos stay the right way up. Colors are converted to standard sRGB so they look right on most screens.

One exception to know about. If you keep the same format and the new file would not be smaller, the tool keeps your original instead. That kept original still contains its metadata. A button lets you use the new file instead, which has the metadata removed.

iPhone HEIC photos

By default, iPhones save photos as HEIC. Safari on Mac, iPhone and iPad can open these with the device's own viewer, so there the tool converts them to JPG, PNG or WebP. Chrome, Firefox and Edge cannot open HEIC, so the tool cannot read the file there.

We deliberately do not ship our own HEIC decoder. The video technology inside HEIC has complicated licensing. So we rely on the device's own viewer, which is already licensed.

If your browser cannot open HEIC, here is what to do instead. Menu names change between versions, so look for the closest match.

• On a Mac: open the photo in Preview, choose File, then Export, and pick JPEG. The Photos app also has an Export command.
• On an iPhone, for new photos: go to Settings, then Camera, then Formats, and choose Most Compatible. New photos will be saved as JPG.
• On an iPhone, for moving photos: go to Settings, then Photos, then Transfer to Mac or PC, and choose Automatic. Photos are converted as they move to a computer.
• On Windows: the Photos app opens HEIC once Microsoft's HEIF and HEVC extensions are installed from the Microsoft Store. The HEVC one may cost a small fee. Then save the photo as JPG.

Image size cheat sheet

Common sizes for social media and the web, in pixels, width × height. Use them as a starting point.

Platforms change these sizes without notice. The numbers are common recommendations, not guarantees, so check the platform's own help page. The tool's Longest side setting is the quick way to hit a width: set it to the longest edge you need. It never enlarges a picture.

What limits this tool

We set no limit on how many photos you add or how big they are. The real limit is your device's memory.

This device is working on 1 at a time, so a long list is fine.

A single very large picture (tens of megapixels) can be too much for a phone, and then it is reported as an error. Use Longest side to shrink it and try again.

Frequently asked questions

Open-source software this tool uses

This tool is built on free software made by other people. Thank you to everyone who maintains it.

• MozJPEG (via the jSquash packages) (BSD-style (IJG, BSD-3-Clause, zlib)). Creates the smaller JPG files. This software is based in part on the work of the Independent JPEG Group.
• libwebp (via jSquash) (BSD-3-Clause). Creates WebP files.
• libavif and libaom (via jSquash) (BSD-2-Clause, with the AOMedia patent license). Creates AVIF files.
• oxipng (via jSquash) (MIT). Packs PNG files more tightly without changing a pixel.
• jSquash packages (Apache-2.0). Connect these encoders to the web page.
• fflate (MIT). Builds the ZIP file when you download everything at once.

Every file is served from this site, and nothing is loaded from another server. The license texts ship with the packages.