Your files stay on your Mac.
AZW3 is Amazon's proprietary Kindle ebook format — reflowable and readable only inside Kindle apps. Converting to PDF produces a fixed-layout document that opens in any PDF viewer on any platform. Convertessa processes every file locally; nothing leaves your Mac.
Drag a single AZW3 file or an entire folder onto Convertessa. Batch mode processes every AZW3 in the folder in one pass, writing a PDF alongside each original.
Choose PDF from the output format list. Set quality to balance file size against rendering sharpness — lower quality compresses more, higher quality preserves finer detail.
Click Convert. Convertessa reads each AZW3 locally and writes the PDF to the same folder. No upload, no account, no internet connection required.
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.
Yes. Convertessa extracts the text, headings, and paragraph structure from the AZW3 and renders them into a fixed-layout PDF. The result opens in any standard PDF viewer.
Yes. Drop a folder onto Convertessa or run convertessa ./books/ --to pdf from the command line. Every AZW3 in the folder is converted in a single pass.
No. Convertessa runs entirely on your Mac. Your AZW3 files are read and written locally — nothing is uploaded and no internet connection is needed.