Convert images to JPG, PNG or WebP in your browser
Image formats are not interchangeable. An iPhone photo saved as HEIC may not open on a Windows laptop, a picture downloaded from a website turns out to be WebP and your upload form rejects it, or a screenshot saved as PNG is far too large to email. An image converter fixes all of these by re-saving the picture in the format you actually need.
This converter accepts JPG/JPEG, PNG, WebP, HEIC/HEIF, GIF, BMP and AVIF (where your browser supports it) and saves the result as JPG, PNG or WebP. You can convert one image or a whole batch, and every file is processed on your own device: nothing is uploaded.
Looking for one specific conversion? These pages open the converter with the right output format already selected:
- HEIC to JPG: open iPhone photos on Windows, Android and websites.
- WebP to JPG: fix images saved from websites that won't open or upload.
- WebP to PNG: keep the transparent background of WebP graphics.
- PNG to JPG: shrink screenshots and photos stored as PNG.
- JPG to PNG: get a lossless copy for editing or PNG-only forms.
- JPG to WebP and PNG to WebP: lighter images for websites.
Image formats explained: which one should you use?
Each format was designed for a different job. The table shows the main differences, followed by a short guide to each one.
| Format | Best for | Transparency | Compression | In this tool |
|---|---|---|---|---|
| JPG / JPEG | Photos, forms, email, printing | No | Lossy | Input and output |
| PNG | Screenshots, logos, text, graphics | Yes | Lossless | Input and output |
| WebP | Websites and apps | Yes | Lossy or lossless | Input and output |
| HEIC / HEIF | iPhone photos | Rarely used | Lossy, very efficient | Input only |
| AVIF | Modern websites | Yes | Lossy or lossless | Input, if your browser supports it |
| GIF | Simple animations, tiny graphics | On/off only | Lossless, max. 256 colours | Input (first frame) |
| BMP | Old Windows software | Rarely | Usually uncompressed | Input only |
JPG (JPEG)
The most widely supported image format there is. JPG uses lossy compression, which keeps photos small by discarding detail you're unlikely to notice. It has no transparency, and every time a JPG is edited and saved again a little more quality is lost. Choose JPG for photos and for any form that asks for “JPG/JPEG”.
PNG
PNG is lossless: it stores every pixel exactly, which makes it ideal for screenshots, text, logos, diagrams and anything with a transparent background. The downside is size: a photo saved as PNG is usually much larger than the same photo saved as JPG.
WebP
Developed by Google for the web, WebP produces smaller files than JPG or PNG at similar visual quality and supports transparency. Every current major browser displays it, but some older apps, photo viewers and upload forms still don't accept it, which is why so many people search for a way to turn WebP into JPG.
HEIC / HEIF
The default photo format on iPhones set to “High Efficiency”. HEIC files are compact, but support outside Apple devices is patchy: Windows may need extra extensions, and many websites refuse them. Convert to JPG for sharing and uploading.
AVIF, GIF and BMP
AVIF is a newer, highly efficient web format; this tool can read it in browsers that support it. GIF is limited to 256 colours and is mainly used for simple animations; only the first frame is converted. BMP is an old, usually uncompressed Windows format, so converting a BMP to JPG or PNG almost always makes it far smaller.
Transparency: what happens to see-through backgrounds
PNG and WebP can store transparent pixels; JPG cannot. When you convert a transparent PNG, WebP or GIF to PNG or WebP, the transparency is kept as it is. When you convert it to JPG, the transparent areas have to be filled with a solid colour.
By default the converter fills them with white, which suits documents, forms and most websites. If the image will sit on a coloured or dark background, choose a matching background colour before converting; otherwise soft edges and shadows can show a pale outline.
Converting the other way doesn't remove backgrounds: a JPG saved as PNG keeps its white background. The converter changes the file format, not the content of the picture.
Quality settings and file size
JPG and WebP are lossy formats, so the converter gives you a quality slider for both. Higher values keep more detail and produce bigger files; lower values save space at the cost of softness and blocky artefacts. For photos you want to keep looking their best, stay towards the top of the range; for thumbnails or quick previews you can go lower. PNG is lossless, so it has no quality setting.
Two things are worth knowing before you convert:
- Converting can't add quality back. If a JPG is already blurry or heavily compressed, saving it as PNG keeps it exactly as it is, just in a bigger file.
- Each lossy save loses a little more. Converting JPG to WebP, or WebP to JPG, is another round of compression, so start from the original, highest-quality image whenever you can.
If you need the result below a particular size, for example under 100 KB for an application form, use Compress Image, which can save as JPG, PNG or WebP and aims for an exact KB target.
Metadata and rotation
Photos from phones and cameras carry hidden EXIF metadata: the camera model, the date and time, and often the exact GPS location where the photo was taken. Re-encoding the image removes this data, which is a good thing when you're sharing pictures publicly or uploading them to a website.
The converter also reads the photo's orientation tag and applies it, so pictures that appear sideways in some apps come out the right way up. If you rely on the original “date taken” to sort your photo library, keep the original files alongside the converted copies.
Private, free and nothing to install
Many online image converters upload your photos to a server, convert them there and send them back. UploadWell does the conversion inside your browser instead, using your device's own processing power. Personal photos, ID scans and documents never leave your phone or computer, and there's no waiting for uploads.
There's no sign-up, no watermark and no daily limit, and you don't need a HEIC extension or desktop software. Convert one image or a full folder, then download the files one by one or together as a ZIP.
Tips for online forms and documents
- Most application portals ask for JPG. If yours also specifies pixel dimensions, set them first with the Image Resizer, then compress to the KB limit.
- Need several photos or scans in one file? Convert them to JPG or PNG, then combine them with JPG to PDF.
- Preparing a passport or visa photo from an iPhone? The Passport Photo Maker opens HEIC photos directly, so you can skip the conversion step.
- Keep your originals. Converted copies are perfect for sharing, but the original file is always the best starting point for future edits.