What is Image Format Conversion?
Every image format makes different trade-offs, and plenty of everyday tasks require a specific one: a form that only accepts JPG, a design tool that wants PNG, a website that should serve WebP. Converting re-encodes the same picture into a different container — this tool does it entirely inside your browser, so the image is never uploaded anywhere.
The Three Formats, Honestly Compared
| JPEG | PNG | WebP | |
|---|---|---|---|
| Compression | Lossy | Lossless | Both (lossy here) |
| Transparency | ❌ No | ✅ Yes | ✅ Yes |
| Best for | Photos | Screenshots, logos, text | Web images of any kind |
| Typical photo size | Baseline | 5–10× larger | ~30% smaller than JPEG |
| Compatibility | Universal | Universal | All modern browsers & apps |
| Animation | ❌ | ❌ (APNG rare) | ✅ (not produced here) |
Rules of thumb: photo → JPEG or WebP; screenshot / logo / anything with sharp text → PNG; for the web → WebP, falling back to JPEG only when a legacy system demands it.
How to Use This Tool
- Drop an image onto the box (or click to browse) — PNG, JPEG, WebP, GIF, and BMP are accepted as input.
- Pick the target format; a quality slider appears for the lossy formats (JPEG/WebP).
- Compare the live preview and file sizes.
- Click Download — the file name extension is updated for you.
What Happens to Transparency?
PNG and WebP support transparent pixels; JPEG does not. When you convert a transparent image to JPEG, this tool flattens the transparency onto a white background (the least surprising default for documents and forms). If you need the transparency preserved, convert to WebP or keep PNG — the checkerboard pattern in the preview shows you exactly which areas are transparent before you download.
Conversions People Actually Need
- PNG → JPG: the classic — upload forms and government portals that reject PNG. Expect a dramatic size drop for photos.
- WebP → JPG/PNG: images saved from the web arrive as WebP, and older editors or office suites refuse them. Convert back to something universal.
- JPG → PNG: needed when a tool demands PNG. Note it won’t improve quality — JPEG’s loss already happened — it just changes the container (and grows the file).
- JPG/PNG → WebP: shrink a site’s images ~30% without visible change.
- HEIC from iPhones: not supported by browsers’ decoders — export as JPEG from the Photos app first, then convert here if needed.
Frequently Asked Questions
Is my image uploaded anywhere?
No. Decoding and re-encoding happen in your browser via the canvas API; the file never touches a server. It even works offline once the page has loaded.
Does converting JPG to PNG restore quality?
No — lossy compression is a one-way door. PNG will faithfully preserve the JPEG’s current pixels (artifacts included) in a larger file. Convert to PNG only when a workflow requires the format, not to “upgrade” an image.
Why did my PNG get so much smaller as JPEG?
Because PNG stores photos losslessly, which is expensive. JPEG discards detail your eye barely registers, routinely cutting photo files by 80–90%. For graphics with sharp edges, though, JPEG can look worse and be bigger — that’s PNG territory.
Can I convert GIFs?
Yes, but only the first frame — canvas-based conversion doesn’t carry animation. Animated GIF → WebP/video conversion needs a dedicated tool.
Is metadata (EXIF) preserved?
No — re-encoding drops EXIF, including GPS location and camera details. Good for privacy when sharing; export from your photo manager instead if you need the metadata kept.
Why does the converted image have a white background?
You converted a transparent image to JPEG, which can’t represent transparency, so the transparent areas were flattened to white. Choose WebP or PNG to keep them transparent.