浏览器本地处理图片不会离开你的设备
01 IMAGE CONVERTER
JPG to PGM Converter without uploads.
Convert JPG to PGM locally in your browser. Download files individually or save the complete batch as a ZIP.
JPG → PGM
Convert JPG to PGM
Batch-convert JPG to PGM. Your original files stay on this device.
拖入图片，开始转换
支持 JPG、PNG、WEBP、GIF、BMP、AVIF、HEIC、TIFF、SVG 等常见格式
最多 200 张 · 单文件不超过 100MB · 文件不会上传
当前模式固定输出 WebP
按宽度、高度或百分比等比例调整
数值越高越清晰，文件通常也越大
支持批量转换一次选择多张图片
自动保留文件名只在末尾添加目标格式
02 HOW IT WORKS
三步完成图片转换。
没有账户，没有上传等待，也没有多余设置。只保留完成任务所需要的步骤。
选择图片
拖入一张或多张 JPG、PNG、WebP 等图片。
选择格式
转为 WebP，或在 JPG、PNG、WebP 之间互相转换。
下载结果
单张直接下载，多张图片自动打包为 ZIP。
02 CONVERSION GUIDE
How to convert JPG to PGM
Use the converter above for one image or a complete batch. Processing stays in your browser.
- Choose JPG filesDrop files into the page or use the file picker.
- Convert to PGMStart conversion after the files are ready.
- Download the resultsSave one file at a time or download the batch as ZIP.
JPG
a compact lossy raster format commonly used for photographs. It is commonly chosen for photos, email attachments, and broad device compatibility.
PGM
a simple Netpbm format for grayscale raster images. It is commonly chosen for computer vision, image analysis, and grayscale data.
Before you convert
The conversion changes the file container to PGM. Pixel dimensions are kept unless the destination format requires a different representation.
JPG to PGM questions
How do I convert JPG to PGM?
Add one or more JPG files, click Convert, then download each PGM result or save the complete batch as a ZIP.
Are JPG files uploaded to a server?
No. Conversion runs locally in the current browser tab, and the original files stay on your device.
Can I batch-convert JPG to PGM?
Yes. You can process up to 200 files, save results one by one, or download multiple results in one ZIP file.
What compression quality should I use?
For WebP and JPG, 75–89 is a useful range for most images. Higher values usually increase file size.
Will resizing stretch the image?
No. Width, height, and percentage resizing preserve the original aspect ratio.
What happens when output filenames are duplicated?
Duplicate names are kept unique by adding _(1), _(2), and so on.