Your files stay on your Mac.
Converting a SYLK Spreadsheet to PDF renders your tabular data into a fixed-layout document, preserving column structure and cell formatting exactly as-is. Convertessa runs the entire conversion on your Mac — no internet connection required, no files uploaded to any server. Set quality to control how embedded graphics are encoded in the output PDF.
Drag one or more .slk files into Convertessa, or point it at a folder to process every SYLK file inside in one pass.
Pick PDF from the output format list. Optionally set quality to adjust how any embedded graphics are encoded in the resulting file.
Click Convert. Convertessa writes the PDF files alongside your originals — or to any folder you specify — without touching any server.
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. Convertessa converts SYLK Spreadsheets to PDF entirely on your Mac. Your files never leave the machine — no network connection is required at any point.
Yes. Pass a folder path to the CLI (convertessa ./folder/ --to pdf) or drop an entire folder onto Convertessa to batch-convert every .slk file inside in one run.
Quality controls how embedded graphics are encoded in the output PDF. Higher quality preserves more visual detail; lower quality produces smaller files. Cell data and text are unaffected by this setting.