PromptCraft Studio - Image Compressor
Shrink JPG, PNG and WebP files without uploading them anywhere. Adjust the quality and the maximum width, then download.
Changing quality, width or format compresses your files again with the new settings.
Free Image Compressor: Smaller Photos Without Losing Quality
Large images slow down websites, fill up storage, and get rejected by upload forms with strict size limits. Most of the time, a photo can be made much smaller with almost no visible difference. The trick is finding the right balance between quality and file size.
The PromptCraft Studio Image Compressor handles JPG, PNG and WebP images entirely inside your browser. Adjust the quality, resize large photos, and choose the output format, all without uploading a single file to a server.
Why compress your images?
- Faster websites: Images are usually the heaviest part of a web page. Smaller files mean quicker load times and a better experience for visitors, especially on mobile data.
- Meet upload limits: Many forms, portals and content management systems reject files above a certain size.
- Save storage: Compressed photos take up less space on your phone, computer or cloud drive.
- Quicker sharing: Smaller files upload and send faster over email, chat apps and slow connections.
Quality, width and format explained
| Setting | What it does |
|---|---|
| Quality | Controls how much detail is kept. Lower values give smaller files but can introduce blur or blocky patterns. |
| Max width | Shrinks the image dimensions before compressing. A 4000px photo resized to 1600px is often the biggest single size reduction you can make. |
| Output format | JPG suits photos, WebP usually gives the smallest file for the same quality, and PNG stays lossless but ignores the quality slider. |
How to compress an image
- Set the quality: Start around 75 to 85 percent for photos. Watch the size change in the results list and lower it if you need a smaller file.
- Set a max width (optional): If your original photo is very large, moving this slider down often reduces the file size more than the quality setting alone.
- Choose a format: Pick JPG, WebP or PNG depending on where the image will be used.
- Add your files: Drag images onto the upload area or tap it to choose from your gallery.
- Download: Each row shows the size before and after, with the percentage saved. Download files one at a time or all together.
JPG, PNG or WebP: which should you pick?
JPG remains the safest choice because every device and platform supports it. WebP typically produces the smallest files at a similar quality and is supported by all modern browsers, which makes it a strong choice for websites. PNG should be kept only when you need transparency or perfectly sharp edges, since it does not compress photographic detail as efficiently as the other two formats.
Your images never leave your device
Compression happens locally using your browser's built-in canvas. Files are not uploaded anywhere, so this tool is safe to use for personal photos and confidential work. Everything is cleared when you close or refresh the page.
Frequently Asked Questions (FAQ)
Is this image compressor free to use?
Yes. There is no limit on the number of images, no watermark and no account required.
Does the tool upload my photos?
No. Compression happens entirely in your browser. Your images are never sent to a server.
What quality setting keeps photos looking sharp?
For most photos, 75 to 90 percent keeps the difference nearly invisible while still reducing the file size noticeably. Below about 50 percent, blur and blocky patterns usually become visible.
Why is the compressed file sometimes bigger?
This can happen with very simple, flat-color images that the original format already compressed well, or when the quality is set close to 100 percent. Lowering the quality slightly, or trying a different output format, usually fixes it.
What is the difference between quality and max width?
Quality reduces detail while keeping the image dimensions the same. Max width actually shrinks the picture. For very large photos, reducing the width first often gives a bigger size saving than lowering quality alone.
Can I compress several images at once?
Yes. Add as many files as you like. Each one is compressed and listed separately, and Download all saves them one after another.
Does it work on my phone?
Yes. The tool works on phones, tablets and desktop browsers. On mobile, tap the upload area and choose photos from your gallery.