Your files stay on your Mac.
X BitMap is a monochrome, text-based format originating from the X Window System, used for icons and cursors. Converting to JPG renders the 1-bit image as a standard JPEG accepted by every image editor and web browser. Convertessa handles the conversion locally — no file is ever uploaded.
Drag one or more .xbm files — or a whole folder — onto Convertessa. It reads the monochrome bitmap data directly from each file.
Pick JPG from the output format list. Because JPG is a lossy format, you can set quality to balance file size against image detail.
Click Convert. Convertessa processes every file offline and saves the JPGs alongside your originals — nothing is uploaded.
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. XBM stores only 1-bit (black-and-white) data. The output JPG preserves that monochrome content — Convertessa does not alter colour information.
Yes. JPG is a lossy format, so Convertessa lets you set quality before converting. Higher quality retains more detail; lower quality produces smaller files.
Yes. Convertessa converts X BitMap files entirely offline — no file is uploaded to any server at any point.