Short answer: Choosing an image format depends on how the image will be used. JPG or WebP suits photos and web publishing, PNG is for transparent backgrounds and graphics, TIFF is for print and archiving, and HEIC is for photos taken on Apple devices. The right format balances file size, image quality, and compatibility.
What is the main difference between JPG, PNG, WebP, TIFF, and HEIC?
The main difference is each format's compression method and transparency support. These two features determine both the file size of an image and where it will open without problems.
Compression type falls into two categories:
- **Lossy compression:** Some image data is discarded to reduce file size. Quality can drop a little with each save. JPG and HEIC use this method.
- **Lossless compression:** Image data is preserved, and the file is simply stored more efficiently. PNG and TIFF use this method.
Transparency (transparent background) support is available in PNG, WebP, TIFF, and HEIC; JPG does not support transparency, and transparent areas usually become a white or black background.
In terms of compatibility, JPG opens on almost every device and program. WebP is widely supported in modern browsers. TIFF cannot be displayed in most web browsers. HEIC works smoothly mainly in the Apple ecosystem, and may require extra conversion on Windows and some Android devices.
When should you choose which image format?
Format choice depends on where the image will be used. The table below summarizes the most common use cases.
| Format | Compression | Transparency | Web compatibility | Typical use |
|---|---|---|---|---|
| JPG | Lossy | No | Very high | Photos, blog images, email attachments |
| PNG | Lossless | Yes | High | Logos, icons, screenshots, graphics |
| WebP | Lossy and lossless | Yes | High (modern browsers) | Website images, product photos |
| TIFF | Usually lossless | Yes | Low | Offset printing, professional archiving |
| HEIC | Lossy | Yes | Limited | iPhone and iPad photos |
Practical selection rules:
- **Blog or website photo:** JPG or WebP. At the same image quality, WebP usually produces a smaller file.
- **Logo with a transparent background:** PNG or WebP. JPG cannot preserve transparency.
- **Image to send to a printer:** TIFF. Lossless data is preferred in the printing process.
- **Photo transferred from an iPhone:** HEIC. If the recipient cannot open it, convert it to JPG.
- **Screenshot and interface image:** PNG. Sharp edges and flat colors stay cleaner in a lossless format.
How do you convert an image format?
Format conversion is the process of re-encoding an image from its source format to a target format. The order of steps is as follows:
- Identify the source file: Check which format your image is in. The file extension (`.jpg`, `.png`, `.heic`, `.tiff`) indicates this.
- Choose the target format: Decide based on the intended use. JPG or WebP for the web, PNG for transparency, TIFF for print.
- Apply the conversion: To convert between JPG, PNG, WebP, BMP, GIF, and similar formats, you can use the [Image Converter](/tool/image-converter) tool.
- Check the result: Open the converted image and examine whether there is any loss of color, sharpness, or transparency. To evaluate two images side by side, you can use the [Image Compare](/tool/image-compare) tool.
- Save the file: Store the converted image under a suitable name; keeping the original file as a backup reduces the need for later re-conversion.
When converting from a lossy format (for example, JPG) to a lossy format (for example, WebP), quality may drop somewhat. For this reason, converting from a lossless source or the original file, when possible, gives better results.
How do you reduce image file size without spoiling quality?
The most effective way to reduce file size is to lower the pixel dimensions to what is needed, because the biggest savings without quality loss come from resolution. While 1200 pixels wide is enough for a blog post, publishing a 4000-pixel-wide photo takes up unnecessary space.
Size reduction steps:
- Determine the width at which the image will actually be displayed: Identify how many pixels wide the image will appear on the web page.
- Bring the image to this size: You can use the [Resize Image](/tool/resize-image) tool to resize by pixels or percentage. Preserving the aspect ratio prevents the image from becoming distorted.
- Crop unnecessary edges: Cutting out irrelevant areas both reduces file size and strengthens the image. The [Crop Image](/tool/crop-image) tool does the job for this step.
- Save in a suitable format: Prefer WebP or JPG for photo-heavy images, and PNG for flat-color graphics.
- Compare the result: Check whether quality loss is noticeable.
Lowering the compression quality also reduces file size, but after a certain point this method causes blur and pixelation. For this reason, resizing and cropping first, then adjusting compression, gives a more balanced result.
When is it necessary to convert images to PDF?
Converting images to PDF is a practical solution when you need to share or print multiple images as a single document. Screenshots taken from a browser, scanned documents, or product photos can be collected in one file.
To convert JPG, PNG, WEBP, GIF, BMP, AVIF, and HEIC images to PDF, you can use the Image to PDF tool. PDF output makes it easier to preserve the order and share everything in one file.
In which formats is transparency preserved?
A transparent background is preserved only in PNG, WebP, TIFF, and HEIC; JPG does not support transparency. If you save a PNG file with a transparent background as JPG, the transparent areas are filled with a flat color.
For this reason, if you want to keep a logo or graphic you are working on in an editable state, choose PNG. For photos that do not require transparency, using PNG unnecessarily increases file size.
Which format causes incompatibility in which situations?
Incompatibility is generally seen with HEIC and TIFF files, because these formats are not natively supported in every environment. HEIC photos taken with an iPhone may not open on older Windows versions or in some web panels. TIFF files also cannot be displayed directly in most web browsers.
If you are going to send an image to someone and you do not know which device the recipient uses, JPG is generally the safest common denominator. For images you upload to a website, using WebP works well in modern browsers; if you want to account for older browsers, keep JPG as a backup.
Frequently asked questions
Does JPG or PNG produce a smaller file?
JPG usually produces a smaller file than PNG for the same image, because JPG uses lossy compression. However, this smaller size comes at the cost of discarding some image data.
Will WebP completely replace JPG?
Thanks to its transparency support and efficient compression, WebP is a strong alternative to JPG for web publishing. Still, because it is not supported in all older browsers and programs, JPG is still used as a common backup format.
Can I open a HEIC file on every device?
No, HEIC support is mainly found on Apple devices. To open it on Windows and some Android devices, you may need to convert the file to a more common format such as JPG or PNG.
What format should I save a transparent logo in?
Use PNG or WebP to preserve a transparent background. If you choose JPG, the transparent areas are filled with a flat color and the logo's background is lost.
Should I upload TIFF files to a website?
It is not recommended. TIFF files are large and cannot be displayed directly in most web browsers. For web publishing, JPG or WebP is more appropriate; for print, TIFF is preferable.