Your files stay on your Mac.
Converting JPG to PNG wraps your photos in a lossless container, preventing any further compression artifacts from accumulating. Convertessa reads each JPG locally and writes a pixel-accurate PNG — no file ever leaves your Mac. Batch-convert a single image or an entire folder in one pass.
Drag a single JPG or an entire folder onto Convertessa. No upload required — all processing happens locally on your Mac.
Choose PNG from the output format list. Convertessa will write lossless PNG files, preserving every pixel from each source JPG.
Click Convert. Convertessa processes every file on-device and saves PNG copies to your chosen destination, stripping EXIF and embedded metadata in the process.
Images, audio, video, documents, archives and eBooks — all converted natively, right on your Mac.
Pick a format you have — see everything Convertessa can turn it into.
Convert hundreds of files at once with per-type group defaults and individual overrides.
First-class support for HEIC, AVIF and WebP — encode and decode, both ways. Read JPEG XL and a dozen more modern formats too.
Drop files anywhere on the window. Native, instant, and exactly what you’d expect on a Mac.
Dial in compression, resolution and bitrate. Keep originals pristine or shrink for sharing.
Never overwrite a file by accident. Convertessa appends safe suffixes automatically.
Every job is logged locally. Re-run a previous conversion or revisit recent outputs in a click.
Bundle your converted files straight into a single ZIP, TAR or 7z — packaged and ready to share the moment a job finishes.
Right-click any file in Finder and choose Convert. A Quick Action handles it on the spot — no need to open the app first.
Shrink Convertessa to a tidy mini window that tucks into a corner — just a drop zone and a format picker for quick, one-off conversions.
No cloud. No account. No upload. Every conversion happens entirely on-device, using the power already in your Mac. What you convert is nobody’s business but yours.
Script conversions, wire them into your build, or batch a folder from the terminal. The same engine, no GUI required.
Read the full CLI documentation →Shrink Convertessa down to a small, focused window — drop, convert, done, with your recent conversions one click away.
macOS 14+ · Apple Silicon & Intel
New formats, new features, and fixes — every release, on the record.
No — JPG compression artifacts already baked into the pixel data cannot be recovered. Converting to PNG stops further quality loss by switching to a lossless container, but it cannot restore detail the original JPG encoding discarded.
Usually yes. PNG uses lossless compression, so output files are typically larger than their JPG equivalents — particularly for photos with fine detail or subtle gradients.
Yes. Convertessa removes EXIF and other embedded metadata during conversion, so the output PNG contains no location, camera, or timestamp information carried over from the source JPG.