浏览器本地处理图片不会离开你的设备
01 IMAGE CONVERTER
PNG to FTS Converter without uploads.
Convert PNG to FTS locally in your browser. Download files individually or save the complete batch as a ZIP.
PNG → FTS
Convert PNG to FTS
Batch-convert PNG to FTS. 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 PNG to FTS
Use the converter above for one image or a complete batch. Processing stays in your browser.
- Choose PNG filesDrop files into the page or use the file picker.
- Convert to FTSStart conversion after the files are ready.
- Download the resultsSave one file at a time or download the batch as ZIP.
PNG
a lossless raster format that supports transparent backgrounds. It is commonly chosen for logos, screenshots, interface graphics, and images with transparency.
FTS
a FITS astronomy image extension used for scientific observations. It is commonly chosen for telescope imagery and scientific image data.
Before you convert
The conversion changes the file container to FTS. Pixel dimensions are kept unless the destination format requires a different representation.
PNG to FTS questions
How do I convert PNG to FTS?
Add one or more PNG files, click Convert, then download each FTS result or save the complete batch as a ZIP.
Are PNG 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 PNG to FTS?
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.