Inklaim Free tools Drawing checker
Free tool, no account
Upload your drawing sheets as a PDF or an image and within seconds you see, office by office, what breaks the formal rules: A4 sheet, resolution, color, margins, line weight and text height. For the EPO, PCT, UIBM, USPTO, CNIPA and KIPO. Free, no sign-up, and the file is not kept.
No AI: the checker applies the same rules as the office profiles in the Inklaim editor.
In short
The Inklaim drawing checker reads a PDF of up to 10 pages or a PNG, JPG or TIFF image and, for each office you choose, lists errors and warnings page by page: A4 sheet size, resolution, color, margins, line weight and text height. For margins it tells you which side overflows and by how many millimeters.
It is a free, preliminary check: “no issues found” does not mean the office will accept the drawings. The final review stays with the patent attorney.
A PDF (up to 10 pages) or a PNG, JPG or TIFF, up to 10 MB. The sheets as you would file them.
EPO, PCT, UIBM, USPTO, CNIPA and KIPO, one or all at once: each office has its own measurements.
For each office: errors and warnings, page by page, with the measured values and the required ones.
The rules
The measurements come from the office profiles Inklaim uses to lay out drawing sheets. These are the main ones.
| Office | Source | Minimum margins (top / left / right / bottom) | Minimum text height |
|---|---|---|---|
| EPO | Rule 49(2) EPC and Decision of the President of the EPO dated 7 July 2025, OJ EPO 2025, A49 | 2.5 / 2.5 / 1.5 / 1 cm, usable surface 26.2 × 17 cm | 0.32 cm |
| PCT | PCT Rule 11 | 2.5 / 2.5 / 1.5 / 1 cm | 0.32 cm |
| UIBM | Art. 22 of Ministerial Decree 33/2010 | at least 2.5 cm on all sides | not set for drawings; 0.32 cm as a rule |
| USPTO | 37 CFR 1.84 | 2.5 / 2.5 / 1.5 / 1.0 cm | 0.32 cm (1/8") |
| CNIPA and KIPO | formal rules of the Chinese and Korean offices | usable surface of the office profile | minimum of the office profile |
For line weight the checker uses the profile minimum: 0.4 mm for solid lines with KIPO, 0.2 mm with the other offices. Color is reported as an error only for offices that do not accept color drawings; for the EPO the conditions of the notice in OJ EPO 2025, A57 apply.
Updated October 2026
After the check
With an Inklaim account, drawing sheets are laid out for the chosen office from the start. “Fix all margins” brings the drawing, numerals and labels back inside the usable surface, for one figure or the whole matter, with a before/after preview. Sheets already filed as a scanned PDF are imported with the figures split apart and the numerals read.
FAQ
Yes. It is free and you do not need an account. The only limits are on usage: files up to 10 MB and at most 30 runs per hour.
It stays in memory only while the check runs and is then discarded. It is not saved, and neither the file nor its name ends up in the service logs.
PDFs up to 10 pages and PNG, JPG or TIFF images. If an image does not declare its resolution, the checker assumes a full A4 sheet and says so in the result.
No. It is a preliminary check of the sheet measurements. Texts, figure content and rules that cannot be measured still need to be checked by the patent attorney.
No. Size, margins, lines and text are measured on the file using the office profiles of Inklaim.
The tool opens in your browser's language: Italian, English, German, French, Spanish, Japanese, Chinese or Korean.
The rules explained in full: EPO patent drawing requirements, Italian patent drawings (UIBM), patent drawings: how to prepare them.
Free, no account
Upload a PDF or an image and choose the offices: the result arrives within seconds.