Unsure whether to save an image as JPEG, PNG or WebP? Converting a manual’s image can blur text, while converting a logo can add color to a previously transparent background.
Each format suits different purposes. Check whether the image is a photo, mostly text or needs transparency, then consider the software or website where it will be used. This makes the choice easier.
This article explains the differences between JPEG, PNG and WebP for office work, how to choose by situation and precautions when converting.
A quick guide to choosing an image format
Start with formats that suit your purpose.
| Image or purpose | Candidate format | What to consider |
|---|---|---|
| Photos for emails or documents | JPEG | Easy to balance quality and file size |
| Screenshots with lots of text | PNG | Preserves the edges of text and lines |
| Logos or diagrams with transparent backgrounds | PNG | Can retain the original transparency |
| Images for websites | WebP | Compare quality and size in supported environments |
| A recipient specifies a format | The specified format | Prioritize submission requirements over general guidance |
These are guidelines. JPEG is unsuitable when transparency is needed, even for photos. Follow specified formats even for websites. File sizes vary by content and settings, so check the converted result.
Understand the differences between JPEG, PNG and WebP
JPEG: useful for photos and adjustable file sizes
JPEG works well for scenery, people and product photos with gradual changes in color and brightness. Both .jpg and .jpeg are JPEG file extensions.
Typical JPEG compression reduces size by discarding some image information. Stronger compression can produce smaller files but may lose detail or create noise around edges.
Changes that are unobtrusive in an overall photo may be noticeable in small text or thin lines. JPEG also cannot preserve transparent backgrounds.
Consider JPEG for photos, and other formats when text clarity or transparency matters. This helps narrow the choice.
PNG: for preserving text, lines and transparent backgrounds
PNG uses lossless compression. It is a candidate for text-heavy screenshots, diagrams and logos with transparent backgrounds.
Photos saved as PNG may be larger than JPEG or other formats, however. PNG is not always the best choice.
Converting to PNG does not restore previously lost information. A JPEG with blurred text will not regain its original clarity merely by becoming PNG.
For JPEG and PNG characteristics and images containing text, see MDN’s image format guide, which also explains these points.
WebP: an option for comparing website image quality and size
WebP was developed for the web. It supports both lossy and lossless compression as well as transparency.Google’s official WebP overview describes these features.
It may reduce the size of photos and banners, but it is not guaranteed to be smallest for every image. Results depend on content and settings, so compare appearance and size.
Check support at the destination too. Being viewable in a browser does not guarantee compatibility with business software or submission forms.
Choose formats for common office tasks
Send site or product photos by email
If the recipient has not specified a format, consider JPEG. The quality needed depends on whether the photo shows an overall scene or details such as damage or product numbers.
If the file is large, review dimensions and compression as well as format. Excessive reduction may make important details unreadable.
To adjust file sizes, use JIM-JIN’s Image Compressor to specify dimensions and compression methods. Check the resulting size and important details afterward.
Include screenshots in an instruction manual
Consider PNG when button labels and small text are central. It is useful for retaining text and line edges.
Check the image at the size used in the manual, not only the original. Even a sharp image becomes difficult to read if displayed too small.
You can show the whole screen and a separate enlargement of the relevant controls. If changing formats is insufficient, review the area shown and display size.
Place a logo over a colored document background
To avoid a white rectangle around a logo, use an original with transparency and choose a format such as PNG that preserves it.
Remember: Simply converting to PNG does not make a background transparent. Converting a JPEG with a white background to PNG normally retains that white background.
Removing a background and converting a format are separate operations. If a transparent logo already exists, use it and check its appearance in the document.
Publish photos or banners on a website
Consider WebP if the destination supports it. Check photo details, text within banners and the change in file size.
Check any required transparent areas too. Although WebP supports transparency, results depend on the original and conversion settings.
Verify that the site’s content management system accepts the upload and the image displays correctly on the actual page.
A form or business contact specifies the format
If instructions say JPEG only or PNG supported, follow them. Check whether file size and dimensions are also specified.
Renaming .webp to .jpg does not change the underlying format. Convert and save the image when a different submission format is required.
Steps for converting image formats
Here is how to use JIM-JIN’s Image Format Converter to convert multiple images together into one chosen output format.
Step 1. Keep the originals and select images
Keep unprocessed originals first. If the results do not suit your purpose, you can retry with different settings from the originals.
Add images to the tool and check supported input formats, image counts and size limits. For multiple images, confirm that converting all of them to the same format is appropriate.
Step 2. Choose the output format and settings
Choose JPEG, PNG, WebP or another offered output format. Available formats depend on the processing environment, so check the current screen.
Set quality and the background color for transparent areas as appropriate. When converting transparent PNG to JPEG, check the color that will fill transparent areas.
The quality number is a guide to output quality, not a percentage size reduction. A quality setting of 80 does not necessarily make a file 80% of its original size. Judge the result.
Step 3. Review images, settings and data handling, then convert
On the review screen, check selected images, output format, quality and other settings.
The tool explains that images are temporarily uploaded to a private area of the site for conversion. For work images, review transmission and deletion guidance and your company’s rules before starting.
Step 4. Check saved images where they will actually be used
Save converted images individually or as a ZIP. Open saved images and check the following.
- Small text and necessary details are visible.
- Edges and colors look correct.
- Transparency and background colors are as intended.
- File sizes and dimensions meet submission requirements.
- The destination software or site can open them.
Changing formats can increase file size. If size reduction is your aim, also review dimensions and compression settings.
Common questions about image conversion
Does converting JPEG to PNG restore quality?
No. Conversion to PNG cannot restore information lost in JPEG. If you still have a sharp original, save from that in a suitable format.
Does WebP always make files smaller?
It depends on the image and settings. Quality and dimensions affect results even for the same image, so compare size and appearance.
Does PNG always have a transparent background?
PNG supports transparency, but not every PNG contains transparent areas. Format conversion alone cannot remove a background in the original.
Can I just change the extension?
Changing the extension does not change the image data format. Use a supported tool or application to convert and save it in the required format.
Can I repeatedly convert an image to adjust it?
Repeated saving with lossy compression can compound quality loss. When testing settings, start from the retained original instead of reusing converted images to make comparisons easier.
Choose formats for the image content and destination
If unsure, check the recipient’s requirements first. Without specified requirements, consider JPEG for photos, PNG for text or transparency, and WebP for website use.
Finally, check quality, size and transparency where the image will be used. Choosing by content and purpose reduces guesswork and the need for corrections after conversion.
