FreeNo sign-upmm ⇄ inch
Metric ⇄ Imperial Drawing Converter
Upload a PDF drawing and get every value converted in place, from tolerances to threads.
1 free conversion per dayBoth directionsPDF drawings
Try the switch: every callout flips between mm and inch.
How it works
Three steps, one converted drawing
1
Upload a PDF drawing
Metric or imperial, the tool detects the unit system.
2
Every value converts
Dimensions, tolerances, fits, threads and roughness.
3
Get the converted drawing
Same layout, new unit system, ready to send.
What it converts
Everything on the drawing, not just the numbers
84 mm → 3.3071 inIn-place conversion
Every value is converted where it stands on the drawing.
±0.1 mm → ±0.0039 inTolerances
± tolerances kept at engineering precision.
ISO fitsFits
ISO fits are converted along with the dimension.
M8 → 5/16-18 UNCThreads
ISO metric ⇄ UNC, from M2 to M30.
RaSurface roughness
Roughness values convert with the rest of the drawing.
mm ⇄ inchBoth directions
Metric to imperial or imperial to metric.
Where to find it
Listed where you look for tools
Your data
What leaves your computer
MCP server
Runs on your computer. No upload to Imnoo.
Web app
You upload the PDF drawing to convert it. No sign-up needed.
Questions
Before you convert
Is it free?
Yes. The web app gives you 1 free conversion per day, with no sign-up.
Does it work both ways?
Yes. It converts metric drawings to imperial and imperial drawings to metric.
How precise are the tolerances?
± tolerances are converted at engineering precision, for example 84±0.1 mm becomes 3.3071±0.0039 in.
Which threads are supported?
ISO metric threads from M2 to M30 convert to UNC and back, for example M8 to 5/16-18 UNC.
Can I keep my drawings on my computer?
Yes. Install the MCP server in Claude Desktop, Claude Code, Cursor or VS Code. It runs on your computer, with no upload to Imnoo.
Talk to Imnoo
See your own parts quoted
Log in, book a 30-minute meeting or write to us.