Guide
เครื่องมือแปลงรูปภาพ: what it does and how to use it
The image converter changes pictures between PNG, JPEG, and WebP without an install and without uploading the file. Format choice is mostly about the job: JPEG for photographs, PNG when you need a lossless bitmap or a simple graphic, and WebP when you want a smaller file that modern browsers already display.
JPEG and WebP honor the quality slider, from 50% to 100%. PNG ignores quality because PNG does not use that kind of compression — the control is disabled so you do not think a slider is changing a lossless file. You can convert several images in one drop, and each result lists its new filename and size.
Converting does not resize. A 12-megapixel JPEG turned into WebP is still 12 megapixels. If the goal is a lighter page, convert and then compress or resize. If the goal is compatibility — an old tool that only opens JPG, or a design file that wants PNG — conversion alone is enough.
How to use it
- 1
Choose the output format
Pick PNG, JPEG, or WebP before or after you add files. The format you select is what every image in the current batch will become.
- 2
Set quality for JPEG or WebP
The slider starts high. Drop it if you are optimizing for the web. Leave it near the top if you are handing the file to someone who will edit it again. PNG disables this control.
- 3
Drop the images
Add one image or several. The tool decodes each file locally and re-encodes it in the format you picked.
- 4
Download each result
Check the file size on the row, then download. Your original file stays where it was.
Good uses
- Turning a PNG screenshot into a JPEG before it goes into a document.
- Exporting WebP for a site that still needs a JPEG fallback prepared by hand.
- Normalizing a mixed folder of camera photos and screenshots to one format.
- Making a lossless PNG from a JPEG when a tool refuses to import JPEG.
Tips
- JPEG has no transparency. A logo with a clear background will gain a solid background when you convert it to JPEG. Use PNG or WebP if the transparency matters.
- Converting JPEG to PNG does not restore detail that JPEG already discarded. It only changes the container.
- WebP is widely supported in current browsers, but some older office tools and printers still prefer JPEG or PNG.
- If you need a specific pixel size as well as a new format, resize first so you are not encoding pixels you will throw away.
Limits to know
- Only PNG, JPEG, and WebP are offered as outputs. HEIC, AVIF, GIF, and TIFF are outside this tool.
- Animation is not preserved. A motion image is treated as a still picture.
- Color profiles and exotic metadata are not a goal of this converter. Treat the result as a new bitmap, not a perfect archival copy.
Questions
Will converting to PNG make the photo sharper?+
No. PNG can store the pixels without a new lossy pass, but it cannot invent detail the JPEG already lost.
Why is the quality slider greyed out?+
You selected PNG. PNG compression is lossless, so a JPEG-style quality percentage does not apply.
Are the files uploaded?+
No. Encoding happens in the browser and the result is downloaded to your device.
Can I convert to several formats at once?+
Each run uses one output format. Change the format and drop the files again if you need both a JPEG and a WebP.