Image Converter
Convert between PNG, JPG, WebP, AVIF, GIF, BMP and ICO — instantly, in your browser. Your image never leaves your device.
Convert images without uploading them
Most online converters send your file to a server. Lumisphere doesn’t: the image is decoded and re-encoded by your own browser using the native Canvas API, so it never leaves your device. That makes it private, instant and free — with no sign-up and no limits. Your image is converted at full resolution — every pixel kept, nothing downscaled or watermarked. Want proof? Open your browser’s Network tab, convert an image and you’ll see zero uploads — it even works offline once loaded.
- 1Add. Drop, paste or browse for an image (or several).
- 2Choose. Pick PNG, JPG, WebP or AVIF — tune quality for the lossy ones.
- 3Download. Save the converted file, or the whole batch.
Other conversions: PNG to WebP · WebP to PNG · JPG to PNG · PNG to JPG · SVG to PNG · PNG to ICO · JPG to WebP · WebP to JPG · AVIF to PNG · AVIF to JPG · AVIF to WebP — the same private, in-browser converter. Need transparency instead? Try the background remover (no upload).
Good to know
How do I convert an image?
Drop or paste your image, pick the target format — PNG, JPG, WebP and more — and download. It all runs in your browser, so there’s no upload, sign-up or watermark.
Which format should I choose?
PNG is lossless and keeps transparency — best for logos, icons and screenshots. JPG is smallest for photographs but has no transparency. WebP gives you both: small files and transparency, supported everywhere modern. AVIF is the smallest of all, but newer. GIF suits flat graphics (up to 256 colours), BMP is uncompressed for editing, and ICO packages a favicon for your website.
Which files can I open?
Anything your browser can decode: PNG, JPG, GIF, WebP, AVIF, BMP, ICO and SVG. HEIC (iPhone), TIFF and camera-RAW can’t be read in the browser — convert those to JPG or PNG on your device first, then bring them here.
Is it really private?
Yes. The conversion happens entirely in your browser — there is no upload and nothing is stored on a server. You can even use it offline once the page has loaded.
Will converting reduce the quality?
Converting to PNG is lossless. JPG, WebP and AVIF are compressed — use the quality slider to balance size against sharpness. Note that re-saving a JPG as PNG can’t restore detail the JPG already discarded.
Why can’t I convert a HEIC photo?
Browsers can’t yet decode Apple’s HEIC/HEIF format on a canvas. On iPhone you can set Settings → Camera → Formats → Most Compatible to capture JPG, or export a JPG first, then convert it here.
Which format actually fits your image?
A quick map: PNG is lossless and keeps transparency, so it suits logos, icons and crisp screenshots. JPG is the smallest choice for photographs but flattens any transparency. WebP sits in the middle — small files that can still be transparent — and AVIF goes smaller still at the cost of older-app support. GIF handles flat graphics up to 256 colours, BMP is uncompressed for editing, and ICO packages a favicon. Pick by where the image is going, not by habit.
How in-browser conversion keeps your file private
Every conversion here runs through the native Canvas API: your browser decodes the original, redraws it onto an off-screen canvas, then re-encodes it to the format you chose. Because that whole loop happens on your own device, the image is never sent to a server — nothing to upload, nothing stored, nothing to delete afterwards. The output stays at full resolution, and once the page has loaded it even works offline on a plane or a locked-down network.