Preserves your exact pixels
Converting format never resizes, crops, stretches, or upscales your image. The output dimensions exactly match the correctly oriented source dimensions.
Image tool
Image Converter
Switch between JPG, PNG, and WebP when a form requires a specific format, with dimensions preserved, in this browser tab.
Formats, sizes, and limits
- Input formats
- JPG, PNG, or WebP
- Maximum file size
- 20 MB
- Maximum dimensions
- 24 MP or 12,000 px per side
- Output formats
- JPEG (.jpg), PNG (.png), WebP (.webp)
- Choose image
- Choose format and settings
- Convert and download
Choose image
One JPG, PNG, or WebP image at a time.
Drop one image here
or
JPG, PNG, or WebP. Up to 20 MB and 24 MP.
Drop a replacement here, or use the buttons below.
Processed locally in this tab. Nothing is uploaded.
Choose format and settings
Select target format, quality, and background handling.
Controls JPEG or WebP encoder compression (0 to 100).
Preview and download
Original source and converted output.
No image selected
Choose a JPG, PNG, or WebP image to view previews and convert formats.
Conversion ready
- Original format
- Converted format
- Original dimensions
- Converted dimensions
- Original file size
- Converted file size
- Size change
- Quality setting
- JPEG background
How it works
Key conversion principles
Real format encoding rather than surface-level extension changes.
Handles transparency honestly
PNG and WebP preserve alpha transparency. JPEG has no transparency support, so transparent areas are cleanly flattened onto your chosen background colour.
Re-encoding vs renaming
Renaming a file extension like .png to .jpg does not convert its internal pixel encoding and portals often reject it. FileMizo properly re-encodes the image in your browser.
Before downloading
Review the converted preview, format label, dimensions, and file size. If your target destination requires an exact pixel size or a maximum KB limit, use the related tools below.
- Your original source file remains untouched on your device.
- Output pixel dimensions always match your input.
- JPEG output flattens transparent pixels onto your chosen background.
- Check any separate KB or dimension limits before submitting.
FAQ
Image Converter questions
Details about format differences, compression, transparency, and privacy.
Which image formats can I convert?
The tool accepts still JPG, PNG, and WebP files that your browser can decode. You can convert to JPEG (.jpg), PNG (.png), or WebP (.webp). HEIC, SVG, GIF, APNG, and animated WebP are not supported.
Why does simply renaming the file extension fail?
Every format uses a distinct file header and compression algorithm (such as DEFLATE for PNG, DCT for JPEG). Renaming 'photo.png' to 'photo.jpg' only changes the label on the outside—the underlying data is still PNG. Upload portals that inspect the file header will reject it as invalid or corrupted. This tool decodes and re-encodes the actual pixel data.
Why did my converted PNG become larger than the original JPG?
JPEG uses lossy compression designed for photographs, while PNG uses lossless compression designed to preserve every pixel perfectly. Converting a photographic JPEG into a lossless PNG often results in a significantly larger file size because PNG stores every detail without lossy shortcuts.
Does converting to PNG restore lost quality from a JPG?
No. Lossy compression in a JPEG permanently discards subtle colour data when it was created. Converting to PNG prevents further loss upon saving, but it cannot reconstruct or sharpen details that were already lost.
What happens if I convert to the same format (e.g. JPG to JPG)?
This is a re-export, not a different-format conversion. The image is decoded and re-encoded using your selected quality and background settings. It does not guarantee a smaller file.
Are my images uploaded to any server?
No. The conversion happens entirely inside your browser tab using Web Workers and Canvas APIs. No image data is ever sent to FileMizo or any third-party server.