🔄 Free · private · in-browser
Convert images between JPG, PNG, and WebP
Switch formats instantly — no upload, no watermark, no limits.
Drop images here or click to choose
Converts between JPG, PNG, and WebP — on your device
When (and why) to convert image formats
Every image format makes a different trade-off, and using the wrong one is the most common reason files are too big, look wrong, or get rejected by an uploader. Converting takes seconds and fixes the mismatch: a form that only accepts JPG, a logo that needs a transparent background, a website that wants modern WebP for speed.
JPG is the universal photo format — small files, opened by everything, but no transparency and slight quality loss on every re-save. PNG is lossless and supports transparency, which makes it right for logos, screenshots, and UI graphics — and wasteful for photographs. WebP does both jobs (lossy and lossless, with transparency) at 25–35% smaller sizes, and every modern browser supports it; its only weakness is older desktop software.
How to convert an image
- Drop your image(s) in the panel above.
- Choose the target format. Going to JPG or WebP? Set the quality — 85 is a safe default.
- Converting a transparent PNG to JPG? Pick the background fill color that replaces transparency (white by default).
- Download each converted file — the new size is shown next to the original.
Common conversions, solved
PNG → JPG: the classic “this screenshot is 4 MB” fix; expect files 5–10× smaller. JPG → PNG: needed when a tool demands PNG input — note it will not restore quality JPEG already discarded. PNG → WebP: best of both worlds for the web: transparency preserved at a fraction of the size. WebP → JPG: the compatibility escape hatch when older software refuses a WebP you downloaded.
Private by design
FileNimbus converts images entirely in your browser — no upload, no queue, no server-side copy. That makes it safe for sensitive material (IDs, medical images, unreleased designs) and fast even on a slow connection. Sign in with a free account if you want your conversion history saved; otherwise nothing about your session is retained anywhere.
Frequently asked questions
Which conversions are supported?
Any direction between JPG, PNG, and WebP: JPG→PNG, PNG→JPG, PNG→WebP, WebP→JPG, and so on. HEIC support depends on your browser (Safari opens it natively).
Will converting lose quality?
Converting to PNG is lossless. Converting to JPG or WebP re-encodes at the quality slider value — 85+ is visually identical for nearly all photos.
What happens to transparency when I convert PNG to JPG?
JPEG has no alpha channel, so transparent areas are filled with white (you can pick a different background color in the options). Convert to WebP instead if you need to keep transparency.
Are files uploaded anywhere?
No — conversion happens in your browser via the canvas API. Files never leave your device, and there is nothing for us to store or delete.
Can I convert multiple images at once?
Yes, drop as many as you like; each converts independently and gets its own download button.