About Jakji

The name “Jakji”

Jakji (작지) is how Korean garment factories and design rooms shorten jakeop jisiseo — the tech pack. “Send me the jakji”, “sample jakji, bulk jakji”: it's an everyday word between designers and factories.

A jakji is the promise a designer leaves with a factory: “please make this garment like this”. Because people imagine different garments from the same photo, flats, measurements, fabric and construction have to be written down in numbers and drawings for a sample to come out right the first time. We named the tool Jakji because it helps first-time makers write that promise in the same language the factory uses.

Who made it

Jakji was made by an operator who makes clothes. While making garments, they realized that sending a sample to a factory really requires a document written in the factory's language — a tech pack — and wanted a tool that even first-time makers could use easily.

So the first things built were the parts beginners get stuck on: flats, measurements, terms and the order of documents. Features are added one by one from user feedback. It's run by one person, so replies can be slow, but every message is read. Tell us what's inconvenient or what you'd like via Send feedback or Contact.

Why it exists

First-time designers and shop owners hit the same wall when they send a sample to a factory. Show a photo and say "something like this", and the sample comes back with wide shoulders, a short length or different construction. It's not the factory's fault — there were no agreed numbers and drawings from the start.

Jakji puts that agreement on one page. Choose a garment and sizes, and it builds a tech pack with front and back flats, a size spec per size, fabric and trims, and sewing spec, written in the terms factories use.

Who it's for

One-person brands and own-label shops sending a first sample, and fashion and apparel students. It doesn't try to replace a factory pattern room or a big brand's PLM system; it helps beginners talk to factories in their language and helps students learn the real format.

Jakji is built around Korean garment production: Korean size labels (with letter sizes in the English view), Korean workshop terms, and Korean care-label rules in the Production tab. The English version makes the tool usable for anyone; if you produce elsewhere, check your factory's size conventions and your country's labeling law.

What it does

• Front and back flats for 34 styles in 6 categories (cropped tee, polo, blouson, slacks, joggers, tennis skirt, mermaid skirt, shirt dress and more), drawn to the size spec's proportions
• Flat editing: drag handles to change measurements, move pockets, add notes, arrows and circles
• Graded size specs for men 80–110 and women 44–88 with fit adjustments (regular, oversized, slim) and waist inches for bottoms
• 13 fabric presets, trims tables and default sewing spec per item
• One-page landscape A4 printing; PDF, HTML and flat-sketch SVG export
• Pattern drafting (beta, needs fit testing) for all 34 styles from tech pack measurements, plus a body-measurement straight skirt and a boxed zipper pouch; full-size tiled A4 or large-sheet printing and SVG
• My styles and share links: keep several styles in your browser and send a tech pack by link (no server storage; photos and costs excluded)
• Production: missing-item check, cost and margin, color × size order sheet with Excel (CSV) export, care label text, sample fit log and comparison
• Photo analysis (trial): on-device recognition of item, neckline, closure, pockets and color, and rough measuring from the outline
• Private feedback that only the operator reads (Send feedback)

Principles

We don't hide that measurements are references

The size spec is calculated from regular-fit reference values per item. Real production measurements must come from measuring your sample, and this is stated on screen and in print. In October 2026 the base values were compared with 16 published measurement charts from Korean SPA brands (Musinsa Standard, SPAO) and values more than 1cm off were corrected. AI never estimates measurements — only details.

Photos stay on your device

Uploaded photos are never stored on our server, and recognition runs inside your browser. Details are in the privacy policy.

Not a tool for copying others' designs

Jakji is for documenting your own designs and samples. Copying the shape of another company's product can be illegal, so please don't use it that way.

Operation

Jakji is a free service run by an individual. Running costs may be covered by ads shown on the site's pages. Ads never appear on printed tech packs or on the tool screen. Send ideas and bug reports via Contact.