Why convert TN3 to JPG?
.tn3 is an obsolete Atari ST monochrome bitmap that no current software opens by default. JPEG is accepted almost everywhere - browsers, messaging apps, social media - making it a practical sharing target even if it is not the ideal format for monochrome graphics. Use .png instead if you need a lossless result.
How to convert TN3 to JPG
XnView MP FREE
Enable 'Show all graphic formats' in Settings > General, open the .tn3 file, then go to File > Export, choose JPEG, set quality (80-90 is typical), and save.
RECOIL OPEN-SOURCE
Run recoil2png yourfile.tn3 to produce a PNG, then open that PNG in any image editor and save as JPEG. RECOIL does not export JPEG directly.
About these formats
.TN3
Tiny High-Resolution Image (Atari ST)
A TN3 file is a "Tiny" compressed bitmap from the Atari ST computer - the high-resolution monochrome variant (640x400, black-and-white). To open one today, use RECOIL or XnView MP, both…
Open .TN3 details →
.JPG
JPEG Image
A JPG (also .jpeg) is a compressed photo or image in the JPEG format, standardized in 1992. Every operating system opens it natively - double-click and Windows Photos, macOS Preview, or…
Open .JPG details →Quality & what to watch
- JPEG lossy compression is designed for photographs with continuous tone. Applied to a 1-bit black-and-white bitmap it introduces ringing artifacts around high-contrast edges. PNG is the better target.
- The output JPEG will be exactly 640x400 pixels - the fixed resolution of the Atari ST high-resolution screen - unless you resize during export.
- RECOIL exports PNG only; a second step in any image editor is needed to reach JPEG.
Frequently asked questions
Why does my converted JPG look blurry around edges?
Can I batch-convert multiple TN3 files to JPEG?
.tn3 files, set output to JPEG, and run.Does RECOIL export JPEG directly?
recoil2png tool outputs PNG only. Convert the resulting PNG to JPEG in a second step.
