Is my file uploaded when converting JPEG to PNG?

No. The conversion runs entirely in your browser. The file never leaves your device, there is no server to upload to, and the page works offline once loaded.

Is JPEG to PNG conversion free?

Yes, with no account, no watermark and no file limit per day. frogConvert is open source and there is no server cost to recover, because your device does the work.

How large a file can I convert?

Up to 2 GB for a single file, 500 MB total per batch, and 300 files at once. The practical limit is your device's memory, since everything is processed locally.

Convert JPEG to PNG

Rewraps JPEG image data in PNG's lossless container, which stops further generation loss on subsequent edits.

Convert JPEG to PNG →

Runs on: the browser canvas, running in this tab
Steps: Direct, a single conversion
Input: .jpg · image/jpeg
Output: .png · image/png
Uploads: None. The file never leaves your device.

What to expect

The detail JPEG already discarded does not come back, and the file usually gets larger. Worth doing before editing, not for storage.

Why convert JPEG without uploading

Most online converters take your file, send it to their servers, convert it there and hand back a download link. That means your document sits on someone else's disk, subject to their retention policy and their breaches. It also means you cannot use them offline, and cannot use them at all for anything confidential.

frogConvert does the conversion in the page itself, with the browser canvas. There is no upload step because there is no server. You can disconnect from the network and it still works.

About the formats

JPEG

The dominant photographic format, using discrete cosine transform compression that discards detail the eye is least likely to notice. It has no transparency, and every re-save loses a little more. More about JPEG files.

PNG

Lossless compression with full alpha transparency, ideal for screenshots, logos and line art. Photographs stored as PNG are typically several times larger than the equivalent JPEG. More about PNG files.

Common questions

Is my file uploaded when converting JPEG to PNG?: No. The conversion runs entirely in your browser. The file never leaves your device, there is no server to upload to, and the page works offline once loaded.
Is JPEG to PNG conversion free?: Yes, with no account, no watermark and no file limit per day. frogConvert is open source and there is no server cost to recover, because your device does the work.
How large a file can I convert?: Up to 2 GB for a single file, 500 MB total per batch, and 300 files at once. The practical limit is your device's memory, since everything is processed locally.
What is lost converting JPEG to PNG?: The detail JPEG already discarded does not come back, and the file usually gets larger. Worth doing before editing, not for storage.