Your files stay on your Mac.
TIFF is a lossless raster format built for print, archiving, and professional imaging pipelines. Converting BMP to TIFF preserves every pixel exactly while giving you a container that most creative tools, scanners, and document systems accept natively. Files never leave your Mac — Convertessa runs entirely offline.
Drag a single BMP or an entire folder into Convertessa. Batch mode processes every BMP in the folder in one pass.
Pick TIFF from the output format list. Convertessa writes standard TIFF with lossless compression and preserves the original resolution.
Click Convert. Your TIFF files appear alongside the originals. EXIF and embedded metadata are stripped from the output automatically.
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. Both BMP and TIFF store pixel data without lossy compression. Convertessa uses lossless TIFF output, so the resulting file is a pixel-perfect copy of the original BMP.
Yes. Pass a folder path with convertessa ./folder --to tiff and Convertessa converts every BMP inside it in one command. You can also drag the folder onto the app window.
No. Convertessa runs entirely offline on your Mac. Your BMP files are read and written locally — nothing is sent to a server or cloud service.